0mitl)Mnian JHi0cellaneou0 Collections. TABLES, METEOROLOGICAL AND PHYSICAL, PREPARED FOR THE SMITHSONIAN INSTITUTION. . /./„.*, BY ARNOLD GUYOT, P.D., LL.D., PROFESSOR OF GEOLOGY AND PHYSICAL GEOGRAPHY, COLLEGE OF NEW JERSEY. THIRD EDITION, REVISED AND ENLARGED. WASHINGTON: SMITHSONIAN INSTITUTION. 1859. PHILADELPHIA: COLLINS, PRINTER, 705 JATNE STREET. CONTENTS. THE Tables contained in this collection are divided into six series, as follows : — I. Thermometrical Tables, marked A. II. Hygrometrical Tables, " B. III. Barometrical Tables, " C. IV. Hypsometrical Tables, " D. V. Meteorological Corrections^ " E. VI. Miscellaneous Tables, " F. Each series has an independent paging running through all the tables that it con- tains. The letters A, B, C, D, E, F, at the bottom of each page, indicate the series, and the figure the folio of the series to which the page belongs. The figure at the top of the page indicates the folio of the particular table of which the page is a part. At the head of each series is found a detailed table of its contents. METEOROLOGICAL TABLES I. THERMOMETR1CAL TABLES. PREFACE TO THE FIRST EDITION To PROF, JOSEPH HENRY, Secretary of the Smithsonian Institution. SIR,— IN compliance with your instructions, I have prepared the collection of Meteorological Tables contained in the following pages. I have en- deavored to render it useful, not only to the observers engaged in the sys- tem of Meteorological Observations now in operation under the direction of the Smithsonian Institution, for whom it was immediately designed, but also to any Meteorologist who may desire to compare and to work out portions of the vast amount of Meteorological Observations already ac- cumulated in the stores of science. The reduction of the observations and the extensive comparisons, with- out which Meteorology can do but little, require an amount of mechanical labor which renders it impossible for most observers to deduce for them- selves the results of their own observations. The difficulty is still further increased by the diversity of the thermometricai .and barometrical scales which Meteorologists, faithful to old habits rather than to science and to reason, choose to retain, notwithstanding ,the additional labor they thus gratuitously assume to themselves. To relieve the Meteorologist of a great portion of this labor, by means of tables sufficiently extensive to render calculations and even interpolations unnecessary, is to save his time and his forces in favor of science itself, and thus materially contribute to its advancement. But most of the tables useful in Meteorology being scattered through many volumes, which are often not of easy access, this collection will be, it is hoped, acceptable to the friends of Meteorology, and will supply a want very much felt in this department of the physical sciences. 4 PREFACE TO THE FIP.ST EDITION. In the selection of the matter, I have been guided by the idea that the tables which I sought for my own use might also be those most likely to be wanted by others. But I wish the following to be considered as a first collection, containing only the tables most appropriate to the present purpose. They are, therefore, arranged in different and independent series, with distinct paging, but constituting together a frame-work into which any tables may be readily inserted when wanted, either to make the collec- tion more complete, or to present a choice of tables calculated from some- what different elements, or adapted to various methods of calculation. The measurement of heights by means of the barometer being inti- mately connected with Meteorology, it was thought not inappropriate to admit into this collection Hypsometrical Tables, destined to render this kind of calculations more easy and more rapid, and thus to increase the taste for a method so useful in physical geography. I have preferred the tables of Delcros, as uniting in the greatest degree simplicity and accuracy. Those of Gauss, Bessel, and Baily may be given afterwards. Every table contains directions for its use, when necessary ; moreover, the indication of the elements used in its calculation, and of the source from which it has been taken. When no remark is made as to this last point, the table has been expressly calculated for this volume. Very respectfully, Your obedient servant, A. GUYOT. CAMBRIDGE, MASS., December 15th, 1851. PREFACE TO THE SECOND EDITION. To PROF. JOSEPH HENRY, Secretary of the Smithsonian Institution. SIR,— IN sending to you the Meteorological Tables composing the first edition of this volume, published in 1852, 1 expressed the desire that they be consid- ered as a first collection, containing the tables most needed at the time by the meteorological observers engaged in the system carried on under the supervision of the Smithsonian Institution, but destined to be increased. It was in that expectation, I remarked, that the tables had been arranged in independent series, as a kind of framework, into which a larger number could readily be inserted. It seemed, indeed, highly desirable to offer to the Meteorologist and Physical Geographer, not only the tables they daily need for working out the results of their observations, but also such a vari- ety of tables, computed from different elements, or by different methods, or adapted to different measures, as to enable every one to choose among them those that he most approves, and at the same time properly to compare and to appreciate the results obtained by others. Thanks to the congenial spirit with which the elevated views of the foun- der of the Smithsonian Institution are carried out, that character of general usefulness is not wanting in the present volume. With your agreement, the present edition contains more than three times as much matter as the first ; and a rapid indication of the additions will suffice to justify them, and to show that, in selecting or calculating the new tables, the object just men- tioned was constantly kept in view As to the tables in the first edition, I must remark that, several of them having been printed in my absence, the copy prepared for the printer, in which decimals had to be left out, failed to give always the nearest value. Though these errors are too small to have any importance whatsoever in Meteorology, a careful revision of all the tables on the original computations was made, and they were corrected in the present edition The few actual misprints which were discovered are indicated in a table of errata to the first edition. 6 PREFACE TO THE SECOND EDITION. In the Thermometrical series six small tables have been added ; they were prepared for converting into each other differential results given in degrees of any one of the three thermometrical scales, irrespective of their zero point. The Hygrometrical series has been entirely reorganized. It only con- tained five tables, all in French measures, and the Appendix. It is now composed of twenty-seven, arranged in three divisions. In the ffrst are found ten tables, based on Regnault's hygrometrical constants, both in French and in English measures, in two corresponding sets, for the use of the psychrometer, the dew-point instruments, and for computing the weight of vapor in the air. The whole set in English measures, and Table Y. in French measures, have been prepared for this edition. Being based on the best elements we now possess, they are given here for ordinary use. The second division contains the seven most important tables published in the Greenwich Observations, and Glaisher's extensive Psychrometrical Table. These tables being much used in England, and the results obtained by them exhibiting no inconsiderable differences from those derived from the pre- ceding ones, they are indispensable for comparing these results. The third division, composed of ten miscellaneous tables, furnishes the means of com- paring the different values of the force and the weight of vapor, especially those which have frequently been used in Germany, and also of reducing the indications of Saussure's Hair-Hygrometer to the ordinary scale of moisture. The Appendix has remained as in the first edition, but all the tables have been revised and corrected. The Barometrical series, now in four divisions, has been increased from twelve to twenty-eight tables. Excepting three small tables for capillary action, all the new ones 'have been computed for this edition. The com- parison, now so much needed, of the Russian barometer with the other scales, appears here for the first time. The Hypsometrical series is almost entirely new. It contained only Del- cros's table for barometric and Regnault's table for thermometric measure- ments, besides two auxiliary tables and the thirteen small tables of the Appendix. It now offers twenty-three tables for barometrical measurement of heights, in which all the principal formulae and scales are represented ; three for the measurement of heights by the thermometer, in French and in English measures; and a rich Appendix of forty-four tables, more extensive and convenient than those in the old set, which afford the means of readily converting into each other all the measures usually employed for indicating altitudes. The series of Meteorological Corrections for periodic and non-periodic variations, for all parts of the world, mostly due to the untiring industry of Professor Dove, is an addition which will surely be appreciated by those who know how difficult access to the original tables is for most Meteorol- PREFACE TO THE SECOND EDITION. 7 ogists. A few tables have been added to Dove's collection, computed by Glaisher, Captain Lefroy, and by myself. Most of the tables refer to tem- perature, only two to moisture. Two tables of Barometrical Corrections have been placed in the Hypsometrical series, where they were needed, until they can be joined by others to make a set in this series, which still awaits new contributions, especially for these last two departments. The Miscellaneous series is but begun. I have prepared a list of useful tables, which would be no doubt welcome to the lovers of Terrestrial Physics, and which may be published at some future occasion, if you should then find it expedient. The present collection being designed, not for the scientific only, but for the observers at large, the propriety of the explicit and popular form of the explanations which accompany the tables, and of the directions for using them, will readily be understood. I close by the remark, that, in every instance, the works from which the tables were taken have been carefully noted, and due credit given to their authors. For all the tables without author's names, I am myself respon- sible. I remain, Sir, Very respectfully, yours, A. GUYOT. PKINCETON, N. J., December, 1857. PREFACE TO THE THIRD EDITION A NEW series of Hygrometrical Tables, based on Regnault's Table of Elastic Forces of Vapor, has been published by Mr. Glaisher, in London, 1856. As, however, the Psychrometrical Table has not been computed from Regnault's formula, but by means of empirical factors, the results differ from those contained in Table VII. B. A table containing Glaisher' s empirical fac- tors, therefore, has been added, and will be found on page 144 B. Table XVIII. of the Barometrical set, C, page 72, of the Second Edition, for reducing to the freezing point the Barometers with glass or wooden scales, copied from the Instructions of the Royal Society of London, and which is reprinted in most of the English works on Meteorology, having been found erroneous, a new table has been computed and substituted for it. As a large number of observers still use barometers with wooden scales, it was found advisable to enable them to make the needed interpolations at sight, by giving the corrections for every degree of the thermometer, from 0° to 100° Fahr., and for barometric heights .ranging between 26 and 31 inches. The small Table VI. D, page 48, of the Hypsometrical Tables by the writer, having been found useful for rapid computation of approximate results, a larger one of the same description, which allows to make at sight every interpolation, has been added, on page 92, as Table XIX'. The scientific traveller, wishing to determine, when ascending a mountain, the elevation of the physical or geological phenomena that he meets with, such as the stations of remarkable plants, limits of zones of vegetation, — the geologist who uses the aneroid barometer for geological sections, — the engineer who wishes to know, on the ground, approximately, his results, — will find it con- venient to obtain the relative heights indicated by their instrument by a simple multiplication. The use of the table is explained page D 90. Some of the decimals in the smaller Table VI. D, page 48, above men- tioned, have been slightly altered in order to make both tables agree. In set E of Meteorological Corrections, a table of corrections derived by Professor C. Dewey from the hourly observations of Professor Snell, at Amherst College, has been added, which will be of service especially to the numerous observers in New England and in the neighboring States. The errata indicated in the Second Edition, and a few unimportant ones found since, have been corrected. No other changes have been made in this edition. A. GUYOT. PRINCETON, N. J., April, 1859. I. -III. GENERAL COMPARISON THE THERMOMETRICAL SCALES, OR TABLES SHOWING THE CORRESPONDING VALUES OF EACH FULL DEGREE OF FAHRENHEIT'S, CENTIGRADE, AND REAUMUR'S THERMOMETERS, FROM 4-212° TO 39° FAHRENHEIT. COMPARISON OF THE THERMOMETRICAL SCALES. | THE first three tables of this set give a simultaneous comparison of the three scales mostly used at present in Meteorology, and especially of the portion of the scales not comprised in the more extensive tables which follow them. They form thus a com- plement to these last tables ; but as most of the temperatures contained in them do not occur in Meteorology, the comparison of the full degrees was found sufficient. These three tables have been taken from E. L. Schubarttfs Collection of Physical Tables. Berlin, 1836. Tables IV. to IX. being more useful to the Meteorologist, the calculation has been carried out for every tenth of a degree. Tables VII. and IX. are from the Annuaire Meteor ologique de France ; the others have been calculated. A comparison of the Centigrade and Fahrenheit degrees near the boiling point, for every tenth of a degree, for the sake of the comparison of standard thermometers, will be found at the end of Table VI. Tables X. to XV. will be found useful for comparing differential results, such as ranges of temperature, and any relative amount expressed in degrees of different scales, without reference to their respective zeros. I. COMPARISON OF FAHRENHEIT'S THERMOMETRICAL SCALE WITH THE CENTIGRADE AND REAUMUR'S. y? Fahr. = (a° — 32°) f Centig. = (a* — 32°) f Reaum. Fahren. Centigrade. Reaumur. Fahren. Centigrade. Reaumur. Fahren. Centigrade. Reaumur. +212 211 +100.00 99.44 +80,00 79.56 +172 171 +77.78 77.22 +62.22 61.78 +132 131 +55.56 55.00 +44.44 44.00 210 98.89 79.11 170 76.67 61.33 130 54.44 43.56 209 98.33 78.67 ^69 76.11 60.89 129 53.89 43.11 208 97.78 78.22 168 75.56 60.44 128 53.33 42.67 207 97.22 77.78 167 75.00 60.00 127 52.78 42-22 206 96.67 77.33 166 74.44 59.56 126 52.22 41.78 205 96.11 76.89 165 73.89 59.11 125 51.67 41.33 204 95.56 76.44 164 73.33 58.67 124 51.11 40.89 203 95.00 76.00 163 72.78 58.22 123 50.56 40-44 202 94.44 75.56 162 72.22 57.78 122 50.00 40.00 201 93.89 75.11 161 71.67 57.33 121 49.44 39.56 200 93.33 74.67 160 71.11 56.89 120 48.89 39.11 199 92.78 74.22 159 70.56 56.44 119 48.33 38.67 198 92.22 73.78 158. 70.00 56.00 118 .47.78 38.22 197 91.67 73.33 157 69.44 55.56 117 47.22 37.78 196 91.11 72.89 156 68.89 55.11 116 46.67 37.33 195 90.56 72.44 155 68.33 54.67 115 46.11 36.89 194 90.00 72.00 154 67.78 54.22 114 45.56 36.44 193 89.44 71.56 153 67.22 53.78 113 45.00 36.00 i 192 88.89 71.11 152 66.67 53.33 112 44.44 35.56 191 88-33 70.67 151 66.11 52.89 111 43.89 35.11 190 87.78 70.22 150 65.56 52.44 110 43.33 34.67 189 87.22 69.78 149 65.00 52.00 109 42.78 34.22 188 86.67 69.33 148 64.44 51.56 108 42.22 33.78 187 86.11 68.89 147 63.89 51.11 107 41.67 33.33 186 85.56 68.44 146 63.33 50.67 106 41.11 32.89 185 85.00 68.00 145 62.78 50.22 105 40.56 32.44 184 84.44 67.56 144 62.22 49.78 104 40.00 32.00 183 83.89 67.11 143 61.67 49.33 103 39.44 31.56 182 83.33 66.67 142 61.11 48.89 102 38.89 31.11 181 82.78 66.22 141 60.56 48.44 101 38.33 30.67 180 82.22 65.78 140 60.00 48.00 100 37.78 30.22 179 81.67 65.33 139 59.44 47.56 99 37.22 29.78 178 81.11 64.89 138 58.89 47.11 98 36.67 29.33 177 80.56 64.44 137 58.33 46.67 97 36.11 28.89 176 80.00 64.00 136 57.78 46.22 96 35.56 28.44 175 79.44 63.56 135 57.22 45.78 95 35.0T 28.00 174 78.89 63.11 134 56.67 45.33 94 34.44 27.56 173 78.33 62.67 133 56.11 44.89 93 33.89 27.11 COMPARISON OF FAHR.'s THERMOMETR1CAL SCALE WITH THE CENTIG. AND REAUM. 2 3? Fahr. = (a° — 32°) f Centig. = (z° — 32°) | Reaum. Fahren. Centigrade. Reaumur. Fahren. Centigrade. Reaumur. Fahren. Centigrade. Reaumur. +92 91 +33.33 32.78 +26.67 26.22 +48 47 + 8.89 8.33 + 7.11 6.67 + 4 3 -15.56 -16.11 -12.44 -12.89 90 32.22 25.78 46 7.78 6.22 2 -16.67 -13.33 89 31.67 25.33 45 7.22 5.78 1 -17.22 -13.78 88 31.11 24.89 44 6.67 5.33 0 -17.78 -14.22 87 30.56 24.44 43 6.11 4.89 ~— 1 -18.33 -14.67 86 30.00 24.00 42 5.56 4.44 - 2 -18.89 -15.11 85 29.44 23.56 41 5.00 4.00 - 3 -19.44 -15.56 84 28.89 23.11 40 4.44 3.56 - 4 -20.00 -16.00 83 28.33 22.67 39 3.89 3.11 - 5 -20.56 -16.44 82 27.78 22.22 38 3.33 2.67 - 6 -21.11 -16.89 81 27.22 21.78 37 2.78 2.22 - 7 -21.67 -17.33 80 26.67 21.33 36 2.22 1.78 - 8 -22.22 -17.78 79 26.11 20.89 35 1.67 1.33 - 9 -22.78 -18.22 78 25.56 20.44 34 1.11 0.89 -10 -23.33 -18.67 77 25.00 20.00 33 0.56 0.44 -11 -23.89 -19.11 76 24.44 19.56 32 0.00 0.00 -12 -24.44 -19.56 75 23.89 19.11 31 - 0.56 - 0.44 -13 -25.00 -20.00 74 23.33 18.67 30 - 1.11 - 0.89 -14 -25.56 -20.44 73 22.78 18.22 29 - 1.67 - 1.33 -15 -26.11 -20.89 72 22.22 17.78 28 - 2.22 - 1.78 -16 -26.67 -21.33 71 21.67 17.33 27 - 2.78 - 2.22 -17 -27.22 -21.78 70 21.11 16.89 26 - 3.33 - 2.67 -18 -27.78 -22.22 69 20.56 16.44 25 - 3.89 - 3.11 -19 -28.33 -22.67 68 20.00 16.00 24 - 4-44 - 3.56 -20 -28.89 -23.11 67 19.44 15.56 23 - 5-00 - 4.00 -21 -29.44 -23.56 66 18.89 15.11 22 - 5.56 - 4.44 -22 -30.00 -24.00 65 18.33 14.67 21 - 6.11 - 4.89 -23 -30.56 -24.44 64 17.78 14.22 20 - 6-67 - 5.33 -24 -31.11 -24.89 63 17.22 13.78 19 - 7.22 - 5-78 -25 -31.67 -25.33 62 16.67 13.33 18 - 7.78 - 6.22 -26 -32.22 -25.78 61 16.11 12.89 17 - 8-33 - 6.67 -27 -32.78 -26.22 60 15.56 12.44 16 - 8-89 - 7.11 -28 -33.33 -26.67 59 15.00 12.00 15 - 9-44 - 7.56 -29 -33.89 -27.11 58 14.44 11.56 14 -10.00 - 8.00 -30 -34.44 -27.56 57 13.89 11.11 13 -10-56 - 8.44 -31 -35.00 .-28.00 56 13.33 10.67 12 -11-11 - 8.89 -32 -35.56 -28.44 55 12.78 10.22 11 -11-67 - 9.33 -33 -36.11 -28.89 ' 54 12.22 9.78 10 -12-22 - 9.78 -34 -36.67 -29.33 53 11.67 9.33 9 -12-78 -10.22 -35 -37.22 -29.78 52 11.11 8.89 8 -13-33 -10.67 -36 -37.78 -30.22 51 10.56 8.44 7 -13-89 -11.11 -37 -38.33 -30.67 50 10.00 8.00 6 -14-44 -11.56 -38 -38.89 -31.11 49 9.44 7.56 5 -15.00 -12.00 -39 -39.44 -31.56 For the Continuation see Table IV. and V. TI. COMPARISON OF THE CENTIGRADE THERMOMETER WITH REAUMUR'S AND FAHRENHEIT'S. x° Centig. = (32 + § a?) Fahr. == f a? Reaum. Centig. Reaumur. Fahrenheit. Centig. Reaumur. Fahrenheit. Centig. Reaumur. Fahrenheit. +100 +80.0 +212.0 + 83 +66.4 +181.4 + 66 +52.8 +150.8 99 79.2 210.2 82 65-6 179.6 65 52.0 149.0 98 78.4 208.4 81 64.8 177.8 64 51.2 147.2 97 77.6 206.6 80 64.0 176.0 63 50.4 145.4 96 76.8 204.8 79 63.2 174.2 62 49.6 143.6 95 76.0 203.0 78 62.4 172.4 61 48.8 141.8 94 75.2 201.2 77 61.6 170.6 60 48.0 140.0 93 74.4 199.4 76 60.8 168.8 59 47.2 138.2 92 73.6 197.6 75 60.0 167.0 58 46.4 136.4 91 72.8 195.8 74 59.2 165.2 57 45.6 134.6 90 72.0 194.0 73 58.4 163.4 56 44.8 132.8 89 71.2 192.2 72 57.6 161.6 55 44.0 131.0 88 70.4 190.4 71 56.8 159.8 54 43.2 129.2 87 69.6 188.6 70 56.0 158.0 53 42.4 127.4 86 68.8 186.8 69 55.2 156.2 52 41.6 125.6 85 68.0 185.0 68 54.4 154.4 51 40.8 123.8 84 67.2 183.2 67 53.6 152.6 50 40.0 122.0 For the Continuation see Tables V. and VI. m. COMPARISON OF REAUMUR'S THERMOMETER WITH FAHRENHEIT'S AND THE CENTIGRADE. 3? Reaum. = (32° + | a?) Fahr. = £ & Centig. Reaumur. Fahrenheit. Centigrade. Reaumur. Fahrenheit. Centigrade. Reaumur. Fahrenheit. Centigrade. +80 79 +212.00 209.75 +100.00 98.75 +66 65 +180.50 178.25 +82.50 81.25 +52 51 +149.00 146.75 +65.00 63.75 78 207.50 97.50 64 176.00 80.00 50 144.50 62.50 77 205.25 96.25 63 173.75 78.75 49 142.25 61.25 76 203.00 95.00 62 171.50 77.50 48 140.00 60.00 75 ' 200.75 93.75 61 169.25 76.25 47 137.75 58.75 • 74 198.50 92.50 60 167.00 75.00 46 135.50 57.50 73 196.25 91.25 59 164.75 73.75 45 133.25 56.25 72 194.00 90.00 58 162.50 72.50 44 131.00 55.00 71 191.75 88.75 57 160.25 71.25 43 128.75 53.75 70 189.50 87.50 56 158.00 70.00 42 126.50 52.50 69 187.25 86.25 55 155.75 68.75 41 124.25 51.25 68 185.00 85.00 54 153.50 67.50 40 122.00 50.00 67 182.75 83.75 53 151.25 66.25 39 119.75 48.75 For the Continuation seo Tables VIII. and IX. 10 IV.-V. \ COMPARISON OP FAHRENHEIT'S THERMOMETER WITH THE CENTIGRADE AND WITH THAT OF REAUMUR, OB TABLES FOR CONVERTING THE DEGREES OF FAHRENHEIT INTO CENTIGRADE DEGREES AND INTO DEGREES OF REAUMUR; GIVING THE CORRESPONDING VALUES FOR EACH TENTH OP A DEGREE, FROM +122° TO — 76° FAHRENHEIT. 11 IV. CONVERSION OF DEGREES OF FAHRENHEIT INTO CENTIGRADE DEGREES. Decrees of Fahren- heit. Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. +122 Centig. -i-50.00 Centig. +50.06 Centig. +50.11 Centig. +50.17 Centig. +50.22 Centig. +50.28 Centig. +50.33 Centig. +50.39 Centig. +50.44 Centig. +50.50 121 49.44 49.50 49.56 49.61 49.67 49.72 49.78 49.83 49.89 49.94 120 48.89 49.94 49.00 49.06 49.11 49.17 49.22 49.28 49.33 49.39 119 48.33 48.39 48.44 48.50 48.56 48.61 48.67 48.72 48.78 48.83 118 47.78 47.83 47.89 47.94 48.00 48.06 48.11 48.17 48.22 48.28 117 47.22 47.28 47.33 47.39 47.44 47.50 47.56 47.61 47.67 47.72 116 46.67 46.72 46.78 46.83 46.89 46.94 47.00 47.06 47.11 47.17 115 46.11 46.17 46.22 46.28 46.33 46.39 46.44 46.50 46.56 46.61 114 45.56 45.61 45.67 45.72 45.78 45.83 45.89 45.94 46.00 46.06 113 45.00 45.06 45.11 45.17 45.22 45.28 45.33 45.39 45.44 45.50 112 44.44 44.50 44.56 44.61 44.67 44.72 44.78 44.83 44.89 44.94 111 43.89 43.94 44.00 44.06 44.11 44.17 44.22 44.28 44.33 44.39 110 43.33 43.39 43.44 43.50 43.56 43.61 43.67 43.72 43.78 43.83 109 42.78 42.83 42.89 42.94 43.00 43.06 43.11 43.17 43.22 43.28 108 42.22 42.28 42.33 42.39 42.44 42.50 42.56 42.61 42.67 42.72 107 41.67 41.72 41.78 41.83 41.89 41.94 42.00 42.06 42.11 42.17 106 41.11 41.17 41.22 41.28 41.33 41.39 41.44 41.50 41.56 41.61 105 40.56 40.61 40.67 40.72 40.78 40.83 40.89 40.94 41.00 41.06 104 40.00 40.06 40.11 40.17 40.22 40.28 40.33 40.39 40.44 40.50 103 39.44 39.50 39.56 39.61 39.67 39.72 39.78 39.83 39.89 39.94 102 38.89 38.94 39.00 39.06 39.11 39.17 39.22 39.28 39.33 39.39 101 38.33 38.39 38.44 38.50 38.56 38.61 38.67 38.72 38.78 38.83 100 37.78 37.83 37.89 37.94 38.00 38.06 38.11 38.17 38.22 38.28 99 37.22 37.28 37.33 37.39 37.44 37.50 37.56 37.61 37.67 37.72 98 36.67 36.72 36.78 36.83 36.89 36.94 37.00 37.06 37.11 37.17 97 36.11 36.17 36.22 36.28 36.33 36.39 36.44 36.50 36.56 36.61 96 35.56 35.61 35.67 35.72 35.78 35.83 35.89 35.94 36.00 36.06 95 35.00 35.06 35.11 35.17 35.22 35.28 35.33 35.39 35.44 35.50 94 34.44 34.50 34.56 34.61 34.67 34.72 34.78 34.83 34.89 34.94 93 33.89 33.94 34.00 34.06 34.11 34.17 34.22 34.28 34.33 34.39 92 33.33 33.39 33.44 33.50 33.56 33.61 33.67 33.72 33.78 33.83 91 32.78 32.83 32.89 32.94 33.00 33.06 33.11 33.17 33.22 33.28 90 32.22 32.28 32.33 32.39 32.44 32.50 32.56 32.61 32.67 32.72 89 31.67 31.72 31.78 31.83 31.89 31.94 32.00 32.06 32.11 33.17 88 31.11 31.17 31.22 31.28 31.33 31.39 31.44 31.50 31.56 31.61 87 30.56 30.61 30.67 30.72 30.78 30.83 30.89 30.94 31.00 31.06 86 30.00 30.06 30.11 30.17 30.22 30.28 30.33 30.39 30.44 30.50 85 29.44 29.50 29.56 29.61 29.67 29.72 29.78 29.83 29.89 29.94 84 28.89 28.94 29.00 29.06 29.11 29.17 29.22 29.28 29.33 29.39 83 28.33 28.39 28.44 28.50 28.56 28.61 28.67 28.72 28.78 28.83 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 13 CONVERSION OF DEGREES OF FAHRENHEIT INTO CENTIGRADE DEGREES. Degrees o Fahren- heit. Tenths of Degrees. 0. 1. 2. 3. 4. 5. • 6. 7. 8. 9. -1-82 Centig. -1-27.78 Centig. +27.83 Centig. +27.89 Centig. +27.94 Centig +28.00 Centig. +28.06 Centig. +28.11 Centig. +28.17 Centig. +28.22 Centig. +28.28 81 27.22 27.28 27.33 27.39 27.44 27.50 27.56 27.61 27.67 27.72 80 26.67 26.72 26.78 26.83 26.89 26.94 27.00 27.06 27.11 27.17 79 26.11 26.17 26.22 26.28 26.33 26.39 26.44 26.50 26.56 26.61 78 25.56 25.61 25.67 25.72 25.78 25.83 25.89 25.94 26.00 26.06 77 25.00 25.06 25.11 25.17 25.22 25.28 25.33 25.39 25.44 25.50 76 24.44 24.50 24.56 24.61 24.67 24.72 24.78 24.83 24.89 24.94 75 23.89 23.94 24.00 24.06 24.11 24.17 24.22 24.28 24.33 24.39 74 23.33 23.39 23.44 23.50 23.56 23.61 23.67 23.72 23.78 23.83 73 22.78 22.83 22.89 22.94 23.00 23.06 23.11 23.17 23.22 23.28 72 22.22 22.28 22.33 22.39 22.44 22.50 22.56 22.61 22.67 22.72 71 21.67 21.72 21.78 21.83 21.89 21.94 22.00 22.06 22.11 22.17 70 21.11 21.17 21.22 21.28 21.33 21.39 21.44 21.50 21.56 21.61 69 20.56 20.61 20.67 20.72 20.78 20.83 20.89 20.94 21.00 21.06 68 20.00 20.06 20.11 20.17 20.22 20.28 20.33 20.39 20.44 20.50 67 19.44 19.50 19.56 19.61 19.67 19.72 19.78 19.83 19.89 19.94 66 18.89 18.94 19.00 19.06 19.11 19.17 19.22 19.28 19.33 19.39 65 18.33 18.39 18.44 18.50 18.56 18.61 18.67 18.72 18.78 18.83 64 17.78 17.83 17.89 17.94 18.00 18.06 18.11 18.17 18.22 18.28 63 17.22 17.28 17.33 17.39 17.44 17.50 17.56 17.61 17-67 17.72 62 16.67 16.72 16.78 16.83 16.89 16.94 17.00 17.06 17.11 17.17 61 16.11 16.17 16.22 16.28 16.33 16.39 16.44 16.50 16.56 16.61 60 15.56 15.61 15.67 15.72 15.78 15.83 15.89 15.94 16.00 16.06 59 15.00 15.06 15.11 15.17 15.22 15.28 15.33 15.39 15.44 15.50 58 14.44 14.50 14.56 14.61 14.67 14.72 14.78 14.83 14.89 14.94 57 13.89 13.94 14.00 14.06 14.11 14.17 14.22 14.28 14.33 14.39 56 13.33 13.39 13.44 13.50 13.56 13.61 13.67 13.72 13.78 13.83 55 12.78 12.83 12.89 12.94 13.00 13.06 13.11 13.17 13.22 13.28 54 12.22 12.28 12.33 12.39 12.44 12.50 12.56 12.61 12.67 12.72 53 11.67 11.72 11.78 11.83 11.89 11.94 12.00 12.06 12.11 12.17 52 11.11 11.17 11.22 11.28 11.33 11.39 11.44 11.50 11.56 11.61 51 10.56 10.61 10.67 10.72 10.78 10.83 10.89 10.94 11.00 11.06 50 10.00 10.06 10.11 10.17 10.22 10.28 10.33 10.39 10.44 10.50 49 9.44 9.50 9.56 9.61 9.67 9.72 9.78 9.83 9.89 9.94 48 8.89 8.94 9.00 9.06 9.11 9.17 9.22 9.28 9.33 9.39 47 8.33 8.39 8.44 8.50 8.56 8.61 8.67 8.72 8.78 8.83 46 7.78 7.83 7.89 7.94 8.00 8.06 8.11 8.17 8.22 8.28 45 7.22 7.28 7.33 7.39 7.44 7.50 756 7.61 7.67 7.72 44 6.67 6.72 6.78 6.83 6.89 6.94 7.00 7.06 7.11 7.17 43 6.11 6.17 6.22 6.28 6.33 6.39 6.44 6.50 6.56 6.61 0. 1. 2. 3. 4. 5. 6. •7. 8. 9. 14 CONVERSION OF DEGREES OF FAHRENHEIT INTO CENTIGRADE DEGREES. Degrees of Fahren- heit. Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. +42 Centig. +5.56 Centig. +5.61 Centig. +5.67 Centig. +5.72 Centig. +5.78 Centig. +5.83 Centig. +5.89 Centig. +5.94 Centig. +6.00 Centig. +6.06 41 5.00 5.06 5.11 5.17 5.22 5.28 5.33 5.39 5.44 5.50 40 4.44 4.50 4.56 4.61 4.67 4.72 4.78 4.83 4.89 4.94 39 3.89 3.94 4.00 4.06 4.11 4.17 4.22 4.28 4.33 4.39 38 3.33 3.39 3.44 3.50 3.56 3.61 3.67 3.72 3.78 3.83 37 2.78 2.83 2.89 2.94 3.00 3.06 3.11 8.17 3.22 3.28 36 2.22 2.28 2.33 2.39 2.44 2.50 2.56 2.61 2.67 2.72 35 1.67 1.72 1.78 1.83 1.89 1.94 2.00 2.06 2.11 2.17 34 1.11 1.17 1.22 1.28 1.33 1.39 1.44 1.50 1.56 1.61 33 0.56 0.61 0.67 0.72 0.78 0.83 0.89 0.94 1.00 1.06 32 o.oo 0.06 0.11 0.17 0.22 0.28 0.33 0.39 0.44 0.50 31 - 0.56 - 0.50 - 0.44 - 0.39 - 0.33 - 0.28 - 0.22 - 0.17 - 0-11 - 0.06 30 - 1.11 - 1.06 - 1.00 - 0.94 - 0.89 - 0.83 - 0.78 - 0.72 - 0.67 - 0.61 29 - 1.67 - 1.61 - 1.56 - 1.50 - 1.44 - 1.39 - 1.33 - 1.28 - 1.22 - 1.17 28 - 2.22 - 2.17 - 2.11 - 2.06 - 2.00 - 1.94 - 1.89 - 1.83 - 1.78 - 1.72 27 - 2.78 - 2.72 - 2.67 - 2.61 - 2.56 - 2.50 - 2.44 - 2.39 - 2.33 - 2.28 26 - 3.33 - 3.28 - 3.22 - 3.17 - 3.11 - 3.06 - 3.00 - 2.94 - 2.89 - 2.83 25 - 3.89 - 3.83 - 3.78 - 3.72 - 3.67 - 3.61 - 3.56 - 3.50 - 3.44 - 3.39 24 - 4.44 - 4.39 - 4-33 - 4.28 - 4.22 - 4.17 - 4.11 - 4.06 - 4.00 - 3.94 23 - 5.00 - 4.94 - 4.89 - 4.83 - 4.78 - 4.72 - 4.67 - 4.61 - 4.56 - 4.50 22 - 5.56 - 5.50 - 5.44 - 5.39 - 5.33 - 5.28 - 5.22 - 5.17 - 5.11 - 5.06 21 - 6.11 - 6.06 - 6.00 - 5.94 - 5.89 - 5.83 - 5.78 - 5.72 - 5-67 - 5.61 20 - 6.67 - 6.61 - 6.56 - 6.50 - 6.44 - 6.39 - 6.33 - 6-28 - 6.22 - 6.17 19 - 7.22 - 7.17 - 7.11 - 7.06 - 7.00 - 6.94 - 6.89 - 6.83 - 6.78 - 6.72 18 - 7.78 - 7.72 - 7.67 - 7.61 - 7.56 - 7.50 - 7.44 - 7.39 - 7.33 - 7.28 17 - 8.33 - 8.28 - 8.22 - 8.17 - 8.11 - 8.06 - 8.00 - 7.94 - 7.89 - 7.83 16 - 8.89 - 8.83 - 8.78 - 8.72 - 8.67 - 8.61 - 8.56 - 8.50 - 8.44 - 8.39 15 - 9.44 - 9.39 - 9.33 - 9.28 - 9.22 - 9.17 - 9.11 - 9.06 - 9.00 - 8.94 14 -10.00 - 9.94 - 9.89 - 9.83 - 9.78 - 9.72 - 9.67 - 9.61 - 9.56 - 9.50 13 -10.56 -11.50 -10.44 -10.39 -10.33 -10.28 -10.22 -10.17 -10.11 -10.06 12 -11.11 -11.06 -11.00 -10.94 -10.89 -10.83 -10.78 -10.72 -10.67 -10.61 11 -11.67 -11.61 -11.56 -11.50 -11.44 -11.39 -11.33 -11.28 -11.22 -11.17 10 -12.22 -12.17 -12.11 -12.06 -12.00 -11.94 -11.89 -11.83 -11.78 -11.72 9 -12.78 -12.72 -12.67 -12.61 -12.56 -12.50 -12.44 -12.39 -12.33 -12.28 8 -13.33 -13.28 -13.22 -13.17 -13.11 -13.06 -13.00 -12.94 -12.89 -12.83 7 -13.89 -13.83 -13.78 -13.72 -13.67 -13.61 -13.56 -13.50 -13.44 -13.39 6 -14.44 -14.39 -14.33 -14.28 -14.22 -14.17 -14.11 -14.06 -14.00 -13.94 5 -15.00 -14.94 -14.89 -14.83 -14.78 -14.72 -14.67 -14.61 -14.56 -14.50 4 -15.56 -15.50 -15.44 -15.39 -15.33 -15.28 -15.22 -15.17 -15.11 -15.06 3 -16.11 -16.06 -16.00 -15.94 -15.89 -15.83 -15.78 -15.72 -15.67 -15.61 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 15 CONVERSION OF DEGREES OF FAHRENHEIT INTO CENTIGRADE DEGREES. Degrees of Fahren- heit. Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. Centig. -16.33 7. 8. 0. + 2 Centig. -16.67 Centig. -16.61 Centig. -16.56 Centig. -16.50 Centig. -16.44 Centig. -16.39 Centig. -16.28 Centig. -16.22 Centig. -16.17 1 -17.22 -17.17 -17.11 -17.06 -17.00 -16.94 -16.89 -16.83 -16.78 -16.72 0 -17.78 -17.72 -17.67 -17.61 -17.56 -17.50 -17.44 -17.39 -17.33 -17.28 - 0 -17.78 -17.83 -17.89 -17.94 -18.00 -18.06 -18.11 -18.17 -18.22 -18.28 - 1 -18.33 -18.39 -18.44 -18.50 -18.56 -18.61 -18.67 -18.72 -18.78 -18.83 - 2 -18.89 -18.94 -19.00 -19.06 -19.11 -19.17 -19.22 -19.28 -19.33 -19.39 - 3 -19.44 -19.50 -19.56 -19.61 -19.67 -19.72 -19.78 -19.83 -19.89 -19.94 - 4 -20.00 -20.06 -20.11 -20.17 -20.22 -20.28 -20.33 -20.39 -20.44 -20.50 - 5 -20.56 -20.61 -20.67 -20.72 -20.78 -20.83 -20.89 -20.94 -21.00 -21.06 - 6 -21.11 -21.17 -21.22 -21.28 -21.33 -21.39 -21.44 -21.50 -21.56 -21.61 - 7 -21.67 -21.72 -21.78 -21.83 -21.89 -21.94 -22.00 -22.06 -22.11 -22.17 - 8 -22.22 -22.28 -22.33 -22.39 -22.44 -22.50 -22.56 -22.61 -22.67 -22.72 - 9 -22.78 -22.83 -22.89 -22.94 -23.00 -23.06 -23.11 -23.17 -23.22 -23.28 -10 -23.33 -23.39 -23.44 -23.50 -23.56 -23.61 -23.67 -23.72 -23.78 -23.83 -11 -23.89 -23.94 -24.00 -24.06 -24.11 -24.17 -24.22 -24.28 -24.33 -24.39 -12 -24.44 -24.50 -24.56 -24.61 -24.67 -24.72 -24.78 -24.83 -24.89 -24.94 -13 -25.00 -25.06 -25.11 -25.17 -25.22 -25.28 -25.33 -25.39 -25.44 -25.50 -14 -25.56 -25.61 -25.67 -25.72 -25.78 -25.83 -25.89 -25.94 -26.00 -26.06 -15 -26.11 -26.17 -26.22 -26.28 -26.33 -26.39 -26.44 -26.50 -26.56 -26.61 -16 -26.67 -26.72 -26.78 -26.83 -26.89 -26.94 -27.00 -27.06 -27.11 -27.17 -17 -27.22 -27.28 -27.33 -27.39 -27.44 -27.50 -27.56 -27.61 -27.67 -27.72 -18 -27.78 -27.83 -27.89 -27.94 -28.00 -28.06 -28.11 -28.17 -28.22 -28.28 -19 -28.33 -28.39 -28.44 -28.50 -28.56 -28.61 -28.67 -28.72 -28.78 -28.83 -20 -28.89 -28.94 -29.00 -29.06 -29.11 -29.17 -29.22 -29.28 -29.33 -29.39 -21 -29.44 -29.50 -29.56 -29.61 -29.67 -29.72 -29.78 -29.83 -29.89 -29.94 -22 -30.00 -30.06 -30.11 -30.17 -30.22 -30.28 -30.33 -30.39 -30.44 -30.50 -23 -30.56 -30.61 -30.67 -30.72 -30.78 -30.83 -30.89 -30.94 -31.00 -31.06 -24 -31.11 -31.17 -31.22 -31.28 -31.33 -31.39 -31.44 -31.50 -31.56 -31.61 -25 -31.67 -31.72 -31.78 -31.83 -31.89 -31.94 -32.00 -32.06 -32.11 -32.17 -26 -32-22 -32.28 -32.33 -32.39 -32.44 -32.50 -32.56 -32.61 -32.67 -32.72 -27 -32.78 -32.83 -32.89 -32.94 -33.00 -33.06 -33.11 -33.17 -33.22 -33.28 -28 -33-33 -33.39 -33.44 -33.50 -33.56 -33.61 -33.67 -33.72 -33.78 -33.83 -29 -33.89 -33.94 -34.00 -34.06 -34.11 -34.17 -34.22 -34.28 -34.33 -34.39 -30 -34.44 -34.50 -34.56 -34.61 -34.67 -34.72 -34.78 -34.83 -34.89 -34.94 -31 -35.00 -35.06 -35.11 -35.17 -35.22 -35.28 -35.33 -35.39 -35.44 -35.50 -32 -35.56 -35.61 -35.67 -35.72 -35.78 -35.83 -35.89 -35.94 -36.00 -36.06 -33 -36.11 -36.17 -36.22 -36.28 -36.33 -36.39 -36.44 -36.50 -36.56 -36.61 -34 -36.67 -36.72 -36.78 -36.83 -36.89 -36.94 -37.00 -37.06 -37.11 -37.17 -35 -37.22 -37.28 -37-33 -37.39 -37.44 -37.50 -37.56 -37.61 -37.67 -37.72 -36 -37.78 -37.83 -37.89 -37.94 -38.00 -38.06 -38.11 -38.17 -38.22 -38.28 0. 1. 2, 3. 4. 5. 6. 7. 8. 9. 16 CONVERSION OF DEGREES OF FAHRENHEIT INTO CENTIGRADE DEGREES. Tenths of Degrees. Degrees of Fahren- heit. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Centig. Centig. Centig. Centig. Centig. Centig. Centig. Centig. Centig. Centig. -37 -38.33 -38.39 -38.44 -38.50 -38.56 -38.61 -38.67 -38.72 -38.78 -38.83 -38 -38.89 -38.94 -39.00 -39.06 -39.11 -39.17 -39.22 -39.28 -39.33 -39.39 -39 -39.44 -39.50 -39.56 -39.61 -39.67 -39.72 -39.78 -39.83 -39.89 -39.94 -40 -40.00 -40.06 -40.11 -40.17 -40.22 -40.28 -40.33 -40.39 -40.44 -40.50 -41 -40.56 -40.61 -40.67 -40.72 -40.78 -40.83 -40.89 -40.94 -41.00 -41.06 -42 -41.11 -41.17 -41.22 -41.28 -41.33 -41.39 -41.44 -41.50 -41.56 -41.61 -43 -41.67 -41.72 -41.78 -41.83 -41.89 -41.94 -42.00 -42.06 -42.11 -42.17 -44 -42.22 -42.28 -42.33 -42.39 -42.44 -42.50 -42.56 -42.61 -42.67 -42.72 -45 -42.78 -42.83 -42.89 -42.94 -43.00 -43.06 -43.11 -43.17 -43.22 -43.28 -46 -43.33 -43.39 -43.44 -43.50 -43.56 -43.61 -43.67 -43.72 -43.78 -43.83 -47 -43.89 -43.94 -44.00 -44.06 -44.11 -44.17 -44.22 -44.28 -44.33 -44.39 -48 -44.44 -44.50 -44.56 -44.61 -44.67 -44.72 -44.78 -44.83 -44.89 -44.94 -49 -45.00 -45.06 -45.11 -45.17 -45.22 -45.28 -45.33 -45.39 -45.44 -45.50 -50 -45.56 -45.61 -45.67 -45.72 -45.78 -45.83 -45.89 -45.94 -46.00 -46.06 -51 -46.11 -46.17 -46.22 -46.28 -46.33 -46.39 -46.44 -46.50 -46.56 -46.61 -52 -46.67 -46.72 -46.78 -46.83 -46.89 -46.94 -47.00 -47.06 -47.11 -47.17 -53 -47.22 -47.28 -47.33 -47.39 -47.44 -47.50 -47.56 -47.61 -47.67 -47.72 -54 -47.78 -47.83 -47.89 -47.94 -48.00 -48.06 -48.11 -48.17 -48.22 -48.28 -55 -48.33 -48.39 -48.44 -48.50 -48.56 -48.61 -48.67 -48.72 -48.78 -48.83 -56 -48.89 -48.94 -49.00 -49.06 -49.11 -49.17 -49.22 -49.28 -49.33 -49.39 -57 -49.44 -49.50 -49.56 -49.61 -49.67 -49.72 -49.78 -49.83 -49.89 -49.94 -58 -50.00 -50.06 -50.11 -50.17 -50.22 -50.28 -50.33 -50.39 -50.44 -50.50 -59 -50.56 -50.61 -50.67 -50.72 -50.78 -50.83 -50.89 -50.94 -51.00 -51.06 -60 -51.11 -51.17 -51.22 -51.28 -51.33 -51.39 -51.44 -51.50 -51.56 -51.61 -61 -51.67 -51.72 -51.78 -51.83 -51.89 -51.94 -52.00 -52.06 -52.11 -52.17 -62 -52.22 -52.28 -52.33 -52.39 -52.44 -52.50 -52.56 -52.61 -52.67 -52.72 -63 -52.78 -52.83 -52.89 -52.94 -53.00 -53.06 -53.11 -53.17 -53.22 -53.28 -64 -53.33 -53.39 -53.44 -53.50 -53.56 -53.61 -53.67 -53.72 -53.78 -53.83 -65 -53.89 -53.94 -54.00 -54.06 -54.11 -54.17 -54.22 -54.28 -54.33 -54.39 -66 -54.44 -54.50 -54.56 -54.61 -54.67 -54.72 -54.78 -54.83 -54.89 -54.94 -67 -55.00 -55.06 -55.11 -55.17 -55.22 -55.28 -55.33 -55.39 -55.44 -55.50 -68 -55.56 -55.61 -55.67 -55.72 -55.78 -55.83 -55.89 -55.94 -56.00 -56.06 -69 -56.11 -56.17 -56.22 -56.28 -56.33 -56.39 -56.44 -56.50 -56.56 -56.61 -70 -56.67 -56.72 -56.78 -56.83 -56.89 -56.94 -57.00 -57.06 -57.11 -57.17 -71 -57.22 -57.28 -57.33 -57.39 -57.44 -57.50 -57.56 -57.61 -57.67 -57.72 -72 -57.78 -57.83 -57.89 -57.94 -58.00 -58.06 -58.11 -58.16 -58.22 -58.28 -73 -58.33 -58.39 -58.44 -58.50 -58.56 -58.61 -58.67 -58.72 -58.78 -58.83 -74 -58.89 -58.94 -59.00 -59.06 -59.11 -59.17 -59.22 -59.28 -59.33 -59.39 -75 -59.44 -59.50 -59.56 -59.61 -59.67 -59.72 -59.78 -59.83 -59.89 -59.94 -76 -60.00 -60.06 -60.11 -60.17 -60.22 -60.28 -60.33 -60.39 -60.44 -60.50 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 17 V. CONVERSION DEGREES OF FAHRENHEIT INTO DEGREES OF REAUMUR Degrees o Fahren- heit. Tenths of a Degree. O. 1. 2. 3. 4. 5. 6. 7. 8. 9. Reaumur. Reaumur Reaumur Reaumur Reaumur Reaumur. Reaumur Reaumur. Reaumur Reaumur. +122 +40.00 +40.04 +40.09 +40.13 +40.18 +40.22 +40.27 +40.31 +40.36 +40.40 121 39.56 39.60 39.64 39.69 39.73 39.78 39.82 39.87 39.91 39.96 120 39.11 39.16 39.20 39.24 39.29 39.33 39.38 39.42 39.47 39.51 119 38.67 38.71 38.76 38.80 38.84 38.89 38.93 38.98 39.02 39.07 118 38.22 38.27 38.31 38.36 38.40 38.44 38.49 38.53 38.58 38.62 117 37.78 3782 37.87 37.91 37.96 38.00 38.04 38.09 38.13 38.18 116 37.33 37.38 37.42 37.47 37.51 37.56 37.60 37.64 37.69 37.73 115 36.89 36.93 36.98 37.02 37.07 37.11 37.16 37.20 37.24 37.29 114 36.44 36.49 36.53 36.58 36.62 36.67 36.71 36.76 36.80 36.84 113 36.00 36.04 36.09 36.13 36.18 36.22 36.27 36.31 36.36 36.40 112 35.56 35.60 35.64 35.69 35.73 35.78 35.82 35.87 35.91 35.96 111 35.11 35.16 35.20 35.24 35.29 35.33 35.38 35.42 35.47 35.51 110 34.67 34.71 34.76 34.80 34.84 34.89 34.93 34.98 35.02 35.07 109 34.22 34.27 34.31 34.36 34.40 34.44 34.49 34.53 34.58 34.62 108 33.78 33.82 33.87 33.91 33.96 34.00 34.04 34.09 34.13 34.18 107 33.33 33.38 33.42 33.47 33.51 33.56 33.60 33.64 33.69 33.73 103 32.89 32.93 32.98 33.02 33.07 33.11 33.16 33.20 33.24 33.29 105 32.44 32.49 32.53 32.58 32.62 32.67 32.71 32.76 32.80 32.84 104 32.00 32.04 32.09 32.13 32.18 32.22 32.27 32.31 32.36 32.40 103 31.56 31.60 31.64 31.69 31.73 31.78 31.82 31.87 31.91 31.96 102 31.11 31.16 31.20 31.24 31.29 31.33 31.38 31.42 31.47 31.51 101 30.67 30.71 30.76 30.80 30.84 30.89 30.93 30.98 31.02 31.07 100 30.22 30.27 30.31 30.36 30.40 30.44 30.49 30.53 30.58 30.62 99 29.78 29.82 29.87 29.91 29.96 30.00 30.04 30.09 30.13 30.18 98 29.33 29.38 29.42 29.47 29.51 29.56 29.60 29.64 29.69 29.73 97 28.89 28.93 28.98 29.02 29.07 29.11 29.16 29.20 29.24 29.29 96 28.44 28.49 28.53 28.58 28.62 28.67 28.71 28.76 28.80 28.84 95 28.00 28.04 28.09 28.13 28.18 28.22 28.27 28.31 28.36 28.40 94 27.56 27.60 27.64 27.69 27.73 27.78 27.82 27.87 27.91 27.96 93 27.11 27.16 27.20 27.24 27.29 27.33 27.38 27.42 27.47 27.51 92 26.67 26.71 26.76 26.80 26.84 26.89 26.93 26.98 27.02 27.07 91 26.22 26.27 26.31 26.36 26.40 26.44 26.49 26.53 26.58 26.62 90 25.78 25.82 25.87 25.91 25.96 26.00 26.04 26.09 26.13 26.18 89 25.33 25.38 25.42 25.47 25.51 25.56 25.60 25.64 25.69 25.73 88 24.89 24.93 24.98 25.02 25.07 25.11 25.16 25.20 25.24 25.29 37 24.44 24.49 24.53 24.58 24.62 24.67 24.71 24.76 24.80 24.84 86 24.00 24.04 24.09 24.13 24.18 24.22 24.27 24.31 24.36 24.40 85 23.56 23.60 23.64 23.69 23.73 23.78 23.82 23.87 23.91 23.96 84 23.11 23.16 23.20 23.24 23.29 23.33 23.38 23.42 23.47 23.51 83 22.67 22.71 22.76 22.80 22.84 22.89 22.93 22.98 23.02 23.07 82 22.22 22.27 22.31 22.36 22.40 22.44 22.49 22.53 22.58 22.62 0. 1. 2. 3. 4. 5. 6. •7. S. 9. 18 CONVERSION OF DEGREES OF FAHRENHEIT INTO DEGREES OF REAUMUR. Tenths of a Degree. Degrees of Fahren- heit. 0. .1. 2. 3. 4. 5. 6. 7. 8. 9. Reaumur. Reaumur. Reaumur. Reaumur. Reaumur. Reaumur. Reaumur. Reaumur. Reaumur. Reaumur. +81 +21.78 +21.82 +21.87 +21.91 +21.96 +22.00 +22.04 +22.09 +22.13 +22.18 80 21.33 21.38 21.42 21.47 21.51 21.56 21.60 21.64 21.69 21.73 79 20.89 20.93 20.98 21.02 21.07 21.11 21.16 21.20 21.24 21.29 78 20.44 20.49 20.53 20.58 20.62 20.67 20.71 20.76 20.80 20.84 77 20.00 20.04 20.09 20.13 20.18 20.22 20.27 20.31 20.36 20.40 76 19.56 19.60 19.64 19.69 19.73 19.78 19.82 19.87 19.91 19.96 75 19-11 19.16 19.20 19.24 19-29 19.33 19.38 19.42 19.47 19.51 74 18.67 18.71 18.76 18.80 1884 18.89 18.93 18.98 19.02 19.07 73 18.22 18.27 18.31 18.36 18.40 18.44 18.49 18.53 18.58 18.62 72 17.78 17.82 17.87 17.91 17.96 18.00 18.04 18.09 18.13 18.18 71 17.33 17.38 17.42 17.47 17-51 17.56 17.60 17.64 17.69 17.73 70 16.89 16.93 16.98 17.02 17.07 17.11 17.16 17.20 17.24 17.29 69 16.44 16.49 16.53 16.58 16.62 16.67 16.71 16.76 16.80 16.84 68 16.00 16.04 16.09 16.13 16.18 16.22 16.27 16.31 16.36 16.40 67 15.56 15.60 15.64 15.69 15.73 15.78 15.82 15.87 15.91 15.96 66 15.11 15.16 15.20 15.24 15.29 15.33 15.38 15.42 15.47 15.51 65 14.67 14.71 14.76 14.80 14.84 14.89 14.93 14.98 15.02 15.07 64 14.22 14.27 14.31 14.36 14.40 14.44 14.49 14.53 14.58 14.62 63 13.78 13.82 13.87 13.91 1396 14.00 14.04 14.09 14.13 14.18 62 13.33 13.38 13.42 13.47 13.51 13.56 13.60 13.64 13.69 13.73 61 12.89 12.93 12.98 13.02 13.07 13.11 13.16 13.20 13.24 13.29 60 12.44 12.49 12.53 12.58 12.62 12.67 .12.71 12.76 12.80 12.84 59 12.00 12.04 12.09 12.13 12.18 12.22 12.27 12.31 12.36 12.40 58 11.56 11.60 11.64 11.69 11.73 11.78 11.82 11.87 11.91 11.96 57 11.11 11.16 11.20 11.24 11.29 11.33 11.38 11.42 11.47 11.51 56 10.67 10.71 10.76 10.80 10.84 10.89 10.93 10.98 11.02 11.07 55 10.22 10.27 10.31 10.36 10.40 10.44 10.49 10.53 10.58 10.62 54 9.78 9.82 9.87 9.91 9.96 10.00 10.04 10.09 10.13 10.18 53 9.33 9.38 9.42 9.47 9.51 9.56 9.60 9.64 9.69 9.73 52 8.89 8.93 8.98 9.02 9.07 9.11 9.16 9.20 9.24 9.29 51 8.44 8.49 8.53 8.58 8.62 8.67 8.71 8.76 8.80 8.84 50 8.00 8.04 8.09 8.13 8.18 8.22 8.27 8.31 8.36 8.40 49 7.56 7.60 7.64 7.69 7.73 7.78 7.82 7.87 7.91 7.96 48 7.11 7.16 7.20 7.24 7.29 7.33- 7.38 7.42 7.47 7.51 47 6.67 6.71 6.76 6.80 6.84 6.89 6.93 6.98 7.02 7.07 46 6.22 6.27 6.31 6.36 6.40 6.44 6.49 6.53 6.58 6.62 45 5.78 5.82 5.87 5.91 5.96 6.00 6.04 6.09 6.13 6.18 44 533 5.38 5.42 5.47 5.51 5.56 5.60 5.64 5.69 5.73 43 4.89 4.93 4.98 5.02 5.07 5.11 5.16 5.20 5.24 5.29 42 4.44 4.49 4.53 4.58 4.62 4.67 4.71 4.76 4.80 4.84 41 4.00 4.04 4.09 4.13 4.18 4.22 4.27 4.31 4.36 4.40 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 19 CONVERSION OF DEGREES OF FAHRENHEIT INTO DEGREES OF REAUMUR. Degrees of Tenths of a Degree. Fahren- hsit. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. leaumur Reaumur. Reaumur. leaumur. Reaumur. ileaumur. Eleaumur. Reaumur. Reaumur. Reaumur. +40 + 3.56 + 3.60 + 3.64 + 3.69 + 3.73 + 3.78 + 3.82 + 3.87 + 3.91 + 3.96 39 3.11 3.16 3.20 3.24 3.29 3.33 3.38 3.42 3.47 3.51 38 2.67 2.71 2.76 2.80 2.84 2.89 2.93 2.98 3.02 3.07 37 2.22 2.27 2.31 2.36 2.40 2.44 2.49 2.53 2.58 2.62 38 1.78 1.82 1.87 1.91 1.96 2.00 2.04 2.09 2.13 2.18 35 1.33 1.38 1.42 1.47 1.51 1.56 1.60 1.64 1.69 1.73 34 0.89 0.93 0.98 1.02 1.07 1.11 1.16 1.20 1.24 1.29 33 0.44 0.49 0.53 0.58 0.62 0.67 0.71 0.76 0.80 0.84 32 0.00 0.04 0.09 0.13 0.18 0.22 0.27 0.31 0.36 0.40 31 - 0.44 - 0.40 - 0.36 - 0.31 - 0.27 - 0.22 - 0.18 - 0.13 - 0.09 - 0.04 30 - 0.89 - 0.84 - 0.80 - 0.76 - 0.71 - 0.67 - 0.62 - 0.58 - 0.53 - 0.49 29 - 1.33 - 1.29 - 1.24 - 1.20 - 1.16 - 1.11 - 1.07 - 1.02 - 0.98 - 0.93 28 - 1.78 - 1.73 - 1.69 - 1.64 - 1.60 - 1.56 - 1.51 - 1.47 - 1.42 - 1.38 27 - 2.22 - 2.18 - 2.13 - 2.09 - 2.04 - 2.00 - 1.96 - 1.91 - 1.87 - 1.82 26 - 2.67 - 2.62 - 2.58 - 2.53 - 2.49 - 2.44 - 2.40 - 2.36 - 2.31 - 2.27 25 - 3.11 - 3.07 - 3.02 - 2.98 - 2.93 - 2.89 - 2.84 - 2.80 - 2.76 - 2.71 24 - 3.56 - 3.51 - 3.47 - 3.42 - 3.38 - 3.33 - 3.29 - 3.24 - 3.20 - 3.16 23 - 4.00 - 3.96 - 3.91 - 3.87 - 3.82 - 3.78 - 3.73 - 3.69 - 3.64 - 3.60 22 - 4.44 - 4.40 - 4.36 - 4.31 - 4.27 - 4.22 - 4.18 - 4.13 - 4.09 - 4.04 21 - 4.89 - 4.84 - 4.80 - 4.76 - 4.71 - 4.67 - 4.62 - 4.58 - 4.53 - 4.49 20 - 5.33 - 5.29 - 5.24 - 5.20 - 5.16 - 5.11 - 5.07 - 5.02 - 4.98 - 4.93 19 - 5.78 - 5.73 - 5.69 - 5.64 - 5.60 - 5.56 - 5.51 - 5.47 - 5.42 - 5.38 18 - 6.22 - 6.18 - 6.13 - 6.09 - 6.04 - 6.00 - 5.96 - 5.91 - 5.87 - 5.82 17 - 6.67 - 6.62 - 6.58 - 6.53 - 6.49 - 6.44 - 6.40 - 6.36 - 6.31 - 6.27 16 - 7.11 - 7.07 - 7.02 - 6.98 - 6.93 - 6.89 - 6.84 - 6.80 - 6.76 - 6.71 15 - 7.56 - 7.51 - 7.47 - 7.42 - 7.38 - 7.33 - 7.29 - 7.24 - 7.20 - 7.16 14 - 8.00 - 7.96 - 7.91 - 7.87 - 7.82 - 7.78 - 7.73 - 7.69 - 7.64 - 7.60 13 - 8.44 - 8.40 - 8.36 - 8.31 - 8.27 - 8.22 - 8.18 - 8.13 - 8.09 - 8.04 12 - 8.89 - 8.84 - 8.80 - 8.76 - 8.71 - 8.67 - 8.62 - 8.58 - 8.53 - 8.49 11 - 9.33 - 9.29 - 9.24 - 9.20 - 9.16 - 9.11 - 9.07 - 9.02 - 8.98 - 8.93 10 - 9.78 - 9.73 - 9.69 - 9.64 - 9.60 - 9.56 - 9.51 - 9.47 - 9.42 - 9.38 9 -10.22 -10.18 -10.13 -10.09 -10.04 -10.00 - 9.96 - 9.91 - 9.87 - 9.82 8 -10.67 -10.62 -10.58 -10.53 -10.49 -10.44 -10.40 -10.36 -10.31 -10.27 7 -11.11 -11.07 -11.02 -10.98 -10.93 -10.89 -10.84 -10.80 -10.76 -10.71 6 -11.56 -11.51 -11.47 -11.42 -11.38 -11.33 -11.29 -11.24 -11.20 -11.16 5 -12.00 -11.96 -11.91 -11.87 -11.82 -11.78 -11.73 -11.69 -11.64 -11.60 4 -12.44 -12. 4b -12.36 -12.31 -12.27 -12.22 -12.18 -12.13 -12.09 -12.04 3 -12.89 -12.84 -12.80 -12.76 -12.71 -12.67 -12.62 -12.58 -12.53 -12.49 2 -13.33 -13.29 -13.24 -13.20 -13.16 -13.11 -13.07 -12.02 -12.98 -12.93 1 -13.78 -13.73 -13.69 -13.64 -13.60 -13.56 -13.51 -13.47 -13.42 -13.38 + 0 -14.22 -14.18 -14.13 -14.09 -14.04 -14.00 -13.96 -13.91 -13.87 -13.82 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 20 CONVERSION OF DEGREES OF FAHRENHEIT INTO DEGREES OF REAUMUR. Degrees of Fahren- heit. Tenths of a Degree. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Reaumur. Reaumur. Reaumur. Reaumur. Reaumur. Reaumur. Reaumur. Reaumur. Reaumur. Reaumur. - 0 -14.22 -14.27 -14.31 -14.36 -14.40 -14.44 -14.49 -14.53 -14.58 -14.62 - 1 -14.67 -14.71 -14.76 -14.80 -14.84 -14.89 -14.93 -14.98 -15.02 -15.07 - 2 -15.11 -15.16 -15.20 -15.24 -15.29 -15.33 -15.38 -15.42 -15.47 -15.51 - 3 -15.56 -15.60 -15.64 -15.69 -15.73 -15.78 -15.82 -15.87 -15.91 -15.96 - 4 -16.00 -16.04 -16.09 -16.13 -16.18 -16.22 -16.27 -16.31 -16.36 -16.40 - 5 -16.44 -16.49 -16.53 -16.58 -16.62 -16.67 -16.71 -16.76 -16.80 -16.84 - 6 -16.89 -17.93 -16.98 -17.02 -17.07 -17.11 -17.16 -17.20 -17.24 -17.29 - 7 -17.33 -17.38 -17.42 -17.47 -17.51 -17.56 -17.60 -17.64 -17.69 -17.73 - 8 -17.78 -18.82 -17.87 -17.91 -17.96 -18.00 -18.04 -18.09 -18.13 -18.18 - 9 -18.22 -18.27 -18.31 -18.36 -18.40 -18.44 -1'8.49 -18.53 -18.58 -18.62 -10 -18.67 -18.71 -18.76 -18.80 -18.84 -18.89 -18.93 -18.98 -19.02 -19.07 -11 -19.11 -19.16 -19.20 -19.24 -19.29 -19.33 -19.38 -19.42 -19.47 -19.51 -12 -19.56 -19.60 -19.64 -19.69 -19.73 -19.78 -19.82 -19.87 -19.91 -19.96 -13 -20.00 -20.04 -20.09 -20.13 -20.18 -20.22 -20.27 -20.31 -20.36 -20.40 -14 -20.44 -20.49 -20.53 -20.58 -20.62 -20.67 -20.71 -20.76 -20.80 -20.84 -15 -20.89 -20.93 -20.98 -21.02 -21.07 -21.11 -21.16 -21.20 -21.24 -21.29 -16 -21.33 -21.38 -21.42 -21.47 -21.51 -21.56 -21.60 -21.64 -21.69 .-21.73 -17 -21.78 -21.82 -21.87 -21.91 -21.96 -22.00 -22.04 -22.09 -22.13 -22.18 -18 -22.22 -22.27 -22.31 -22.36 -22.40 -22.44 -22.49 -22.53 -22.58 -22.62 -19 -22.67 -22.71 -22.76 -22.80 -22.84 -22.89 -22.93 -22.98 -23.02 -23.07 -20 -23.11 -23.16 -23.20 -23.24 -23.29 -23.33 -23.38 -23.42 -23.47 -23.51 -21 -23.56 -23.60 -23.64 -23.69 -23.73 -23.78 -23.82 -23.87 -23.91 -23.96 -22 -24.00 -24.04 -24.09 -24.13 -24.18 -24.22 -24.27 -24.31 -24.36 -24.40 -23 -24.44 -24.49 -24.53 -24.58 -24.62 -24.67 -24.71 -24.76 -24.80 -24.84 -24 -24.89 -24.93 -24.98 -25.02 -25.07 -25.11 -25.16 -25.20 -25.24 -25.29 -25 -25.33 -25.38 -25.42 -25.47 -25.51 -25.56 -25.60 -25.64 -25.69 -25.73 -26 -25.78 -25.82 -25.87 -25.91 -25.96 -26.00 -26.04 -26.09 -26.13 -26.18 -27 -26.22 -26.27 -26.31 -26.36 -26.40 -26.44 -26.49 -26.53 -26.58 -26.62 -28 -26.67 -26.71 -26.76 -26.80 -26.84 -26.89 -26.93 -26.98 -27.02 -27.07 -29 -27.11 -27.16 -27.20 -27.24 -27.29 -27.33 -27.38 -27.42 -27.47 -27.51 -30 -27.56 -27.60 -27.64 -27.69 -27.73 -27.78 -27.82 -27.87 -27.91 -27.96 -31 -28.00 -28.04 -28.09 -28.13 -28.18 -28.22 -28.27 -28.31 -28.36 -28.40 -32 -28.44 -28.49 -28.53 -28.58 -28.62 -28.67 -28.71 -28.76 -28.80 -28.84 -33 -28.89 -28.93 -28.98 -29.02 -29.07 -29.11 -29.16 -29.20 -29.24 -29.29 -34 -29.33 -29.38 -29.42 -29.47 -29.51 -29.56 -29.60 -29.64 -29.69 -29.73 -35 -29.78 -29.82 -29.87 -29.91 -29.96 -30.00 -30.04 -30.09 -30.13 -30-18 -36 -30.22 -30.27 -30.31 -30.36 -30.40 -30.44 -30.49 -30.53 -30.58 -30.62 -37 -30.67 -30.71 -30.76 -30.80 -30.84 -30.89 -30.93 -30-98 -31.02 -31.07 -38 -31.11 -31.16 -31.20 -31.24 -31.29 -31.33 -31.38 -31-42 -31.47 -31.51 -39 -31.56 -31.60 -31.64 -31.69 -31.73 -31.78 -31.82 -31.87 -31.91 -31.96 -40 -32.00 -30.04 -30.09 -30.13 -30.18 -30.22 -30.27 -30.31 -30.36 -30.40 \ 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. it 21 VI. -VII. COMPARISON OF THE CENTIGRADE THERMOMETER WITH THE THERMOMETERS OF FAHRENHEIT AND OF REAUMUR, OR TABLES FOR CONVERTING CENTIGRADE DEGREES INTO DEGREES OF FAHRENHEIT AND OF REAUMUR; GIVING THE CORRESPONDING VALUES FOR EACH TENTH OF A DEGREE, FROM 4-50° TO — 54° CENTIGRADE. 23 VI. CONVERSION OF CENTIGRADE DEGREES INTO DEGREES OF FAHRENHEIT. Tenths of Degrees. Centigrade Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. +50 +122.00 +122.18 +122.36 +122.54 +122.72 +122.90 +123.08 +123.26 +123.44 +123.62 49 120.20 120.38 120.56 120.74 120.92 121.10 121.28 121.46 121.64 121.82 48 118.40 118.58 118.76 118.94 119.12 119.30 119.48 119.66 119.84 120.02 47 116.60 116.78 116.96 117.14 117.32 117.50 117.68 117.86 118.04 118.22 46 114.80 114.98 115.16 115.34 115.52 115.70 115.88 116.06 116.24 116.42 45 113.00 113.18 113.36 113.54 113.72 113.90 114.08 114.26 114.44 114.62 44 111.20 111.38 111.56 111.74 111.92 112.10 112.28 112.46 112.64 112.82 43 109.40 109.58 109.76 109.94 110.12 110.30 110.48 110.66 110.84 111.02 42 107.60 107.78 107.96 108.14 108.32 108.50 108.68 108.86 109.04 109.22 41 105.80 105.98 106.16 106.34 106.52 106.70 106.88 107.06 107.24 107.42 40 104.00 104.18 104.36 104.54 104.72 104.90 105.08 105.26 105.44 105.62 39 102.20 102.38 102.56 102.74 102.92 103.10 103.28 103.46 103.64 103.82 38 100.40 100.58 100.76 100.94 101.12 101.30 101.48 101.66 101.84 102.02 37 98.60 98.78 98.96 99.14 99.32 99.50 99.68 99.86 100.04 100.22 36 96.80 96.98 97.16 97.34 97.52 97.70 97.88 98.06 98.24 98.42 35 95.00 95.18 95.36 95.54 95.72 95.90 96.08 96.26 96.44 96.62 34 93.20 93.38 93.56 93.74 93.92 94.10 94.28 94.46 94.64 94.82 33 91.40 91.58 91.76 91.94 92.12 92.30 92.48 92.66 92.84 93.02 32 89.60 89.78 89.96 90.14 90.32 90.50 90.68 90.86 91.04 91.22 31 87.80 87.98 88.16 88.34 88.52 88.70 88.88 89.06 89.24 89.42 30 86.00 86.18 86.36 86.54 86.72 86.90 87.08 87.26 87.44 87.62 29 84.20 84.38 84.56 84.74 84.92 85.10 85.28 85.46 85.64 85.82 28 82.40 82.58 82.76 82.94 83.12 83.30 83.48 83-66 83.84 .84.02 27 80.60 80.78 80.96 81.14 81.32 81.50 81.68 81.86 82.04 82.22 26 78.80 78.98 79.16 79.34 79.52 79.70 79.88 80.06 80.24 80.42 25 77.00 77.18 77.36 77.54 77.72 77.90 78.08 78.26 78.44 78.62 24 75.20 75.38 75.56 75.74 75.92 76.10 76.28 76.46 76.64 76.82 23 73.40 73.58 73.76 73.94 74.12 74.30 74.48 74.66 74.84 75.02 22 71.60 71.78 71.96 72.14 72.32 72.50 72.68 72.86 73.04 73.22 21 69.80 69.98 70.16 70.34 70.52 70.70 70.88 71.06 71.24 71.42 20 68.00 68.18 68.36 68.54 68.72 68.90 69.08 69.26 69.44 69.62 19 66.20 66.38 66.56 66.74 66.92 67.10 67.28 67.46 67.64 67.82 18 64.40 64.58 64.76 64.94 65.12 65.30 65.48 65.66 65.84 66.02 17 62.60 62.78 62.96 63.14 63.32 63.50 63.68 63.86 64.04 64.22 16 60.80 60.98 61.16 61.34 61.52 61.70 61.88 62.06 62.24 62.42 15 59.00 59.18 59.36 59.54 59.72 59.90 60.08 60.26 60.44 60.62 14 57.20 57.38 57.56 57.74 57.92 58.10 58.28 58.46 58.64 58.82 13 55.40 55.58 55.76 55.94 56.12 56.30 56.48 56.66 56.84 57.02 12 53.60 53.78 53.96 54.14 54.32 54.50 54.68 54.86 55.04 55.22 11 51.80 51.98 52.16 52.34 52.52 52.70 52.88 53.06 53.24 53.42 !| jl 0. 1. ». 3. 4. 5. 6. 7. 8. 9- 25 CONVERSION OF CENTIGRADE DEGREES INTO DEGREES OF FAHRENHEIT. Tenths of Degrees. Centigrade Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. +10 +50.00 +50.18 +50.36 +50.54 +50.72 +50.90 +51.08 +51.26 +51.44 +51.62 9 48.20 48.38 48.56 48.74 48.92 49.10 49.28 49.46 49.64 49.82 8 46.40 46.58 46.76 46.94 47.12 47.30 47.48 47.66 47.84 48.02 7 44.60 44.78 44.96 45.14 45.32 45.50 45.68 45.86 46.04 46.22 6 42.80 42.98 43.16 43.34 43.52 43.70 43.88 44.06 44.24 44.42 5 41.00 41.18 41.36 41.54 41.72 41.90 42.08 42.26 42.44 42.62 4 39.20 39.38 39.56 39.74 39.92 40.10 40.28 40.46 40.64 40.82 3 37.40 37.58 37.76 37.94 38.12 38.30 38.48 38.66 38.84 39.02 2 35.60 35.78 35.96 36.14 36.32 36.50 36.68 36.86 37.04 37.22 1 33.80 33.98 34.16 34.34 34.52 34.70 34.88 35.06 35.24 35.42 0 32.00 32.18 32.36 32.54 32.72 32.90 33.08 33.26 33.44 33.62 - a 32.00 31.82 31.64 31.46 31.28 31.10 30.92 30.74 30.56 30.38 - i 30.20 30.02 29.84 29.66 29.48 29.30 29.12 28.94 28.76 28.58 - 2 28.40 28.22 28.04 27.86 27.68 27.50 27.32 27.14 26.96 26.78 - 3 26.60 26.42 26.24 26.06 25.88 25.70 25.52 25.34 25.16 24.98 - 4 24.80 24.62 24.44 24.26 24.08 23.90 23.72 23.54 23.36 23.18 - 5 23.00 22.82 22.64 22.46 22.28 22.10 21.92 21.74 21.56 21.38 - 6 21.20 21.02 20.84 20.66 20.48 20.30 20.12 19.94 19.76 19.58 - 7 19.40 19.22 19.04 18.86 18.68 18.50 18.32 18.14 17.96 17.78 - 8 17.60 17.42 17.24 17.06 16.88 16.70 16.52 16.34 16.16 15.98 - 9 15.80 15.62 15.44 15.26 15.08 14.90 14.72 14.54 14.36 14.18 -10 14.00 13.82 13.64 13.46 13.28 13.10 12.92 12.74 12.56 12.38 -11 12.20 12.02 11.84 11.66 11.48 11.30 11.12 10.94 10.76 10.58 -12 10.40 10.22 10.04 9.86 9.68 9.50 9.32 9.14 8.96 8.78 -13 8.60 8.42 8.24 8.06 7.88 7.70 7.52 7.34 7.16 6.98 -14 6.80 6.62 6.44 6.26 6.08 5.90 5.72 5.54 5.36 5.18 -15 5.00 4.82 4.64 4.46 4.28 4.10 3.92 3.74 3.56 3.38 -16 3.20 3.02 2.84 2.66 2.48 2.30 2.12 1.94 1.76 1.58 -17 1.40 1.22 1.04 0.86 0.68 0.50 0.32 0.14 - 0.04 - 0.22 -18 - 0.40 - 0.58 - 0.76 - 0.94 - 1.12 - 1.30 - 1.48 - 1.66 - 1.84 - 2.02 -19 - 2.20 - 2.38 - 2.56 - 2.74 - 2.92 - 3.10 - 3.28 - 3.46 - 3.64 - 3.82 -20 - 4.00 - 4.18 - 4.36 - 4.54 - 4.72 - 4.90 - 5.08 - 5.26 - 5.44 - 5.62 -21 - 5.80 - 5.98 - 6.16 - 6.34 - 6.52 - 6.70 - 6.88 - 7.06 - 7.24 - 7.42 -22 - 7.60 - 7.78 - 7.96 - 8.14 - 8.32 - 8.50 - 8.68 - 8.86 - 9.04 - 9.22 -23 - 9.40 - 9.58 - 9.76 - 9.94 -10.12 -10.30 -10.48 -10.66 -10.84 -11.02 -24 -11.20 -11.38 -11.56 -11.74 -11.92 -12.10 -12.28 -12.46 -12.64 -12.82 -25 -13.00 -13.18 -13.36 -13.54 -13.72 -13.90 -14.08 -14.26 -14.44 -14.62 -26 -14.80 -14.98 -15.16 -15.34 -15.52 -15.70 -15.88 -16.06 -16.24 -16.42 -27 -16.60 -16.78 -16.96 -17.14 -17.32 -17.50 -17.68 -17.86 -18.04 -18.22 -28 -18.40 -18.58 -18.76 -18.94 -19.12 -19.30 -19.48 -19.66 -19.84 -20.02 -29 -20.20 -20.38 -20.56 -20.74 -20.92 -21.10 -21.28 -21.46 -21.64 -21.82 0. 1. 2. 3. 4. 5. 6. •7. 8. 9. 26 CONVERSION OF CENTIGRADE DEGREES INTO DEGREES OF FAHRENHEIT. Tenths of Degrees. Centigrade Degrees. o. 1. 2. 3. 4. 5. 6. 7. 8. 9. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. -30 -22.00 -22.18 -22.36 -22.54 -22.72 -22.90 -23.08 -23.26 -23.44 -23.62 -31 -23.80 -23.98 -24.16 -24.34 -24.52 -24.70 -24.88 -25.06 -25.24 -25.42 -32 -25.60 -25.78 -25.96 -26.14 -26.32 -26.50 -26.68 -26.86 -27.04 -27.22 -33 -27.40 -27.58 -27.76 -27.94 -28.12 -28.30 -28.48 -28.66 -28.84 -29.02 -34 -29.20 -29.38 -29.56 -29.74 -29.92 -30.10 -30.28 -30.46 -30.64 -30.82 -35 -31.00 -31.18 -31.36 -31.54 -31.72 -31.90 -32.08 -32.26 -32.44 -32.62 -36 -32.80 -32.98 -33.16 -33.34 -33.52 -33.70 -33.88 -34.06 -34.24 -34.42 -37 -34.60 -34.78 -34.96 -35.14 -35.32 -35-50 -35.68 -35.86 -36.04 -36.22 -38 -36.40 -36.58 -36.76 -36.94 -37.12 -37.30 -37.48 -37.66 -37,84 -38.02 -39 -38.20 -38.38 -38.56 -38.74 -38.92 -39.10 -39.28 -39.46 -39.64 -39.82 -40 -40.00 -40.18 -40.36 -40.54 -40.72 -40.90 -41.08 -41.26 -41.44 -41.62 -41 -41.80 -41.98 -42.16 -42.34 -42.52 -42.70 -42.88 -43.06 -43.24 -43.42 -42 -43.60 -43.78 -43.96 -44.14 -44.32 -44.50 -44.68 -44.86 -45.04 -45.22 -43 -45.40 -45.58 -45.76 -45.94 -46.12 -46.30 -46.48 -46.66 -46.84 -47.02 -44 -47.20 -47.38 -47.56 -47.74 -47.92 -48.10 -48.28 -48.46 -48.64 -48.82 -45 -49.00 -49.18 -49,36 -49.54 -49.72 -49.90 -50.08 -50.26 -50.44 -50.62 -46 -50.80 -50.98 -51.16 -51.34 -51.52 -51.70 -51.88 -52.06 -52.24 -52.42 -47 -52.60 -52.78 -52.96 -53.14 -53.32 -53.50 -53.68 -53.86 -54.04 -54.22 -48 -54.40 -54.58 -54.76 -54.94 -55.12 -55.30 -55.48 -55.66 -55.84 -56.02 -49 -56.20 -56.38 -56.56 -56.74 -56.92 -57.10 -57.28 -57.46 -57.64 -57.82 -50 -58.00 -58.18 -58.36 -58.54 -58.72 -58.90 -59.08 -59.26 -59.44 -59.62 -51 -59.80 -59.98 -60.16 -60.34 -60.52 -60.70 -60.88 -61.06 -61.24 -61.42 -52 -61.60 -61.78 -61.96 -62.14 -62.32 -62.50 -62.68 -62.86 -63.04 -63.22 -53 -63.40 -63.58 -63.76 -63.94 -64.12 -64.30 -64.48 -64.66 -64.84 -65.02 -54 -65.20 -65.38 -65.56 -65.74 -65.92 -66.10 -66.28 -66.46 -66.64 -66.82 TABLE FOR COMPARING THE CENTIGRADE AND FAHRENHEIT'S THERMOMETERS NEAR THE BOILING POINT. Centigrade Degrees. 0. 1. 2. 3. 4. 5. 6. T. 8. 9. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. 100 212.00 212.18 212.36 212.54 212.72 212.90 213.08 213.26 213.44 213.62 99 210.20 210.38 210.56 210.74 210.92 211.10 211.28 211.46 211.64 211.82 98 208.40 208.58 208.76 208.94 209.12 209.30 209.48 209.66 209.84 210.02 97 206.60 206.78 206.96 207.14 207.32 207.50 207.68 207.86 208.04 208.22 96 204.80 204.98 205.16 205.34 205.52 205.70 205.88 206.06 206.24 206.42 95 203.00 203.18 203.36 203.54 203.72 203.90 204.08 204.26 204.44 204.62 94 201.20 201.38 201.56 201.74 201.92 202.10 202.28 202.46 202.64 202.82 93 199.40 199.58 199.76 199.94 200.12 200.30 200.48 20066 200.84 201.02 92 197.60 197.78 197.96 198.14 198.32 198.50 198.68 198.86 199.04 199.22 91 195.80 195.98 196.16 196.34 196.52 196.70 196.88 197.06 197.24 197.42 90 194.00 194.18 194.36 194.54 194.72 194.90 195.08 195.26 195.44 195.62 89 192.20 192.38 192.56 192.74 192.92 193.10 193.28 193.46 193.64 193.82 VII. CONVERSION OF CENTIGRADE DEGREES INTO DEGREES OF REAUMUR. 1 Centigrade Degrees. Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. +40 Reaum. +32.00 Reaum. +32.08 Reaum. +32.16 Reaum. +32.24 Reaum. +32.32 Reaum. +32.40 Reaum. +32.48 Reaum. +32.56 Reaum. +32.64 Reaum. +32.72 31.92 39 31.20 31.28 31.36 31.44 31.52 31.60 31.68 31.76 31.84 38 30.40 30.48 30.56 30.64 30.72 30.80 30.88 30.96 31.04 31.12 37 29.60 29.68 29.76 29.84 29.92 30.00 30.08 30.16 30.24 30.32 36 28.80 28.88 28.96 29.04 29.12 29.20 29.28 29.36 29.44 29.52 35 28.00 28.08 28.16 28.24 28.32 28.40 28.48 28.56 28.64 28.72 34 27.20 27.28 27.36 27.44 27.52 27.60 27.68 27.76 27.84 27.92 33 26.40 26.48 26.56 26.64 26.72 26.80 26.88 26.96 27.04 27.12 32 25.60 25.68 25.76 25.84 25.92 26.00 26.08 26.16 26.24 26.32 31 24.80 24.88 24.96 25.04 25.12 25.20 25.28 25.36 25.4d 25.52 30 24.00 24.08 24.16 24.24 25.32 24.40 24.48 24.56 24.64 24.72 29 23.20 23.28 23.36 23.44 23.52 23.60 23.68 23.76 23.84 23.92 28 22.40 22.48 22.56 22.64 22.72 22.80 22.88 22.96 23.04 23.12 27 21.60 21.68 21.76 21.84 21.92 22.00 22.08 22.16 22.24 22.32 26 20.80 20.88 20.96 21.04 21.12 21.20 21.28 21.36 21.44 21.52 25 20.00 20.08 20.16 20.24 20.32 20.40 20.48 20.56 20.64 20.72 24 19.20 19.28 19.36 19.44 19.52 19.60 19.68 19.76 19.84 19.92 23 18.40 18.48 18.56 18.64 18.72 18.80 18.88 18.96 19.04 19.12 22 17.60 17.68 17.76 17.84 17.92 18.00 18.08 18.16 18.24 18.32 21 16.80 16.88 16.96 17.04 17.12 17.20 17.28 17.36 17.44 17.52 20 16.00 16.08 16.16 16.24 16.32 16.40 16.48 16.56 16.64 16.72 19 15.20 15.28 15.36 15.44 15.52 15.60 15.68 15.76 15.84 15.92 18 14.40 14.48 14.56 14.64 14.72 14.80 14.88 14.96 15.04 15.12 17 13.60 13,68 13.76 13.84 13.92 14.00 14.08 14.16 14.24 14.32 16 12.80 12.88 12.96 13.04 13.12 13.20 13.28 13.36 13.44 13.52 15 12.00 12.08 12.16 12.24 12.32 12.40 12.48 12.56 12.64 12.72 14 11.20 11.28 11.36 11.44 11.52 11.60 11.68 11.76 11.84 11.92 13 10.40 10.48 10.56 10.64 10.72 10.80 10.88 10.96 11.04 11.12 12 9.60 9.68 9.76 9.84 9.92 10.00 10.08 10.16 10.24 10.32 11 8.80 8.88 8.96 9.04 9.12 9.20 9.28 9.36 9.44 9.52 10 8.00 8.08 8.16 8.24 8.32 8.40 8.48 8.56 8.64 8.72 9 7.20 7.28 7.36 7.44 7.52 7.60 7.68 7.76 7.84 7.92 8 6.40 6.48 6.56 6.64 6.72 6.80 6.88 6.96 7.04 7.12 7 5.60 5.68 5.76 5.84 5.92 6.00 6.08 6.16 6.24 6.32 6 4.80 4.88 4.96 5.04 5.12 5.20 5.28 5.36 5.44 5.52 5 4.00 4.08 4.16 4.24 4.32 4.40 4.48 4.56 4.64 4.72 4 3.20 3.28 3.36 3.44 3.52 3.60 3.68 3.76 3.84 3.92 3 2.40 2.48 2.56 2.64 2.72 2.80 2.88 2.96 3.04 3.12 2 1.60 1.68 1.76 1.84 1.92 2.00 2.08 2.16 2.24 2.32 1 0.80 0.88 0.96 1.04 1.12 1.20 1.28 1.36 1.44 1.52 0 0 0 0.00 0 0.08 o 0.16 o 0.24 o 0.32 4. o 0.40 o 0.48 o 0.56 o 0.64 o 0.72 i 0. 1. 2. 3. 5. 6. 7. 8. 9. VIII. -IX. COMPARISON OF REAUMUR'S THERMOMETER WITH THE THERMOMETER OF FAHRENHEIT AND THE CENTIGRADE THERMOMETER, OR TABLES FOE CONVERTING DEGREES OP REAUMUR INTO DEGREES OF FAHRENHEIT AND INTO CENTIGRADE DEGREES; GIVING THE CORRESPONDING VALUES FOR EACH TENTH OP A DEGREE, FROM 4-40° TO — 40° REAUMUR. 29 VIII. CONVERSION OF DEGREES OF REAUMUR INTO DEGREES OF FAHRENHEIT. Tenths of Degrees. Degrees of Reaumur. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Fahren. Fahren. Fahren. Fahren. Fahren Fahren. Fahren. Fahren. Fahren. Fahren. +40 +122.00 +122.22 +122.45 +12^.67 +122.9 +123.12 +123.35 +123.5 +123.80 +124.02 39 119.75 119.97 120.20 120.42 120.6 120.87 121.10 121.3 121.55 121.77 38 117.50 117.72 117.95 118.17 118.40 118.62 118.85 119.0 119.30 119.52 37 115.25 115.47 115.70 115.92 116.1o 116.37 116.60 116.82 117.05 117.27 36 113.00 113.22 113.45 113.67 113.90 114.12 114.35 114.57 114.80 115.02 35 110.75 110.97 111.20 111.42 111.65 111.87 112.10 112.32 112.55 112.77 34 108.50 108.72 108.95 109.17 109.40 109.62 109.85 110.07 110.30 110.52 33 106.25 106.47 106.70 106.92 107.15 107.37 107.60 107.82 108.05 108.27 32 104.00 104.22 104.45 104.67 104.90 105.12 105.35 105.57 105.80 106.02 31 101.75 101.97 102.20 102.42 102.65 102.87 103.10 103.32 103.55 103.77 30 99.50 99.72 99.95 100.17 100.40 100.62 100.85 101.07 101.30 101.52 29 97.25 97.47 97.70 97.92 98.15 98.37 98.60 98.82 99.05 99.27 28 95.00 95.22 95.45 95.67 95.90 96.12 96.35 96.57 96.80 97.02 27 92.75 92.97 93.20 93.42 93.65 93.87 94.10 94.32 94.55 94.77 26 90.50 90.72 90.95 91.17 91.40 91.62 91.85 92.07 92.30 92.52 25 88.25 88.47 88.70 88.92 89.15 89.37 89.60 89.82 90.05 90.27 24 86.00 86.22 86.45 86.67 86.90 87.12 87.35 87.57 87.80 88.02 23 83.75 83.97 84.20 84.42 84.65 84.87 85.10 85.32 85.55 85.77 22 81.50 81.72 81.95 82.17 82.40 82.62 82.85 83.07 83.30 83.52 21 79.25 79.47 79.70 79.92 80.15 80.37 80.60 80.82 81.05 81.27 20 77.00 77.22 77.45 77.67 77.90 78.12 78.35 78.57 78.80 79.02 19 74.75 74.97 75.20 75.42 75.65 75.87 76.10 76.32 76.55 76.77 18 72.50 72.72 72.95 73.17 73.40 73.62 73.85 74.07 74.30 74.52 17 70.25 70.47 70.70 70.92 71.15 71.37 71.60 71.82 72.05 72.27 16 68.00 68.22 68.45 68.67 68.90 69.12 69.35 69.57 69.80 70.02 15 65.75 65.97 66.20 66.42 66.65 66.87 67.10 67.32 67.55 67.77 14 63.50 63.72 63.95 64.17 64.40 64.62 64.85 65.07 65.30 65.52 13 61.25 61.47 61.70 61.92 62.15 62.37 62.60 62.82 63.05 63.27 12 59.00 59.22 59.45 59.67 59.90 60.12 60.35 60.57 60.80 61.02 '11 56.75 56.97 57.20 57.42 57.65 57.87 58.10 58.32 58.55 58.77 10 54.50 54.72 54.95 55.17 55.40 55.62 55.85 56.07 56.30 56.52 9 52.25 52.47 52.70 52.92 53.15 53.37 53.60 53.82 54.05 54.27 8 50.00 50.22 50.45 50.67 50.90 51.12 51.35 51.57 51.80 52.02 7 47.75 47.97 48.20 48.42 48.65 48.87 49.10 49.32 49.55 49.77 6 45.50 45.72 45.95 46.17 46.40 46.62 46.85 47.07 47.30 47.53 5 43.25 43.47 43.70 43.92 44.15 44.37 44.60 44.82 45.05 45.27 4 41.00 41.22 41.45 41.67 41.90 42.12 42.35 42.57 42.80 43.02 3 38.75 38.97 39.20 39.42 39.65 39.87 40.10 40.32 40.55 40.77 2 36.50 36.72 36.95 37.17 37.40 37.62 37.85 38.07 38.30 38.52 1 34.25 34.47 34.70 34.92 35.15 35.37 35.60 35.82 36.05 36.27 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 30 CONVERSION OF DEGREES OF REAUMUR INTO DEGREES OF FAHRENHEIT. Tenths of Degrees. Degrees of Reaumur. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. Fahren. + 0 +32.00 +32.22 +32.45 +32.67 +32.90 +33.12 +33.35 +33.57 +33.80 +34.02 - 0 32.00 31.77 31.55 31.32 31.10 30.87 30.65 30.42 30.20 29.97 - 1 29.75 29.52 29.30 29.07 28.85 28.62 28.40 28.17 27.95 27.72 - 2 27.50 27.27 27.05 26.82 26.60 26.37 26.15 25.92 25.70 25.47 - 3 25.25 25.02 24.80 24.57 24.35 24.12 23.90 23.67 23.45 23.22 - 4 23.00 22.77 22.55 22.32 22.10 21.87 21.65 21.42 21.20 20.97 - 5 20.75 20.52 20.30 20.07 19.85 19.62 19.40 19.17 18.95 18.72 - 6 18.50 18.27 18.05 17.82 17.60 17.37 17.15 16.92 16.70 16.47 - 7 16.25 16.02 15.80 15.57 15.35 15.12 14.90 14.67 14.45 14.22 - 8 14.00 13.77 13.55 13.32 13.10 12.87 12.65 12.42 12.20 11.97 - 9 11.75 11.52 11.30 11.07 10.85 10.62 10.40 10.17 9.95 9.72 -10 9.50 9.27 9.05 8.82 8.60 8.37 8.15 7.92 7.70 7.47 -11 7.25 7.02 6.80 6.57 6.35 6.12 5.90 5.67 5.45 5.22 -12 5.00 4.77 4.55 4.32 4.10 3.87 3.65 3.42 3.20 2.97 -13 2.75 2.52 2.30 2.07 1.85 1.62 1.40 1.17 0.95 0.72 -14 0.50 0.27 0.05 - 0.17 - 0.40 - 0.62 - 0.85 - 1.07 - 1.30 - 1.52 -15 - 1.75 - 1.97 - 2.20 - 2.42 - 2.65 - 2.87 - 3.10 - 3.32 - 3.55 - 3.77 -16 - 4.00 - 4.22 - 4.45 - 4.67 - 4.90 - 5.12 - 5.35 - 5.57 - 5.80 - 6.02 -17 - 6.25 - 6.47 - 6.70 - 6.92 - 7.15 - 7.37 - 7.60 - 7.82 - 8.05 - 8.27 -18 - 8.50 - 8.72 - 8.95 - 9.17 - 9.40 - 9.62 - 9.85 -10.07 -10.30 -10.52 -19 -10.75 -10.97 -11.20 -11.42 -11.65 -11.87 -12.10 -12.32 -12.55 -12.77 -20 -13.00 -13.22 -13.45 -13.67 -13.90 -14.12 -14.35 -14.57 -14.80 -15.02 -21 -15.25 -15.47 -15.70 -15.92 -16.15 -16.37 -16.60 -16.82 -17.05 -17.27 -22 -17.50 -17.72 -17.95 -18.17 -18.40 -18.62 -18.85 -19.07 -19.30 -19.52 -23 -19.75 -19.97 -20.20 -20.42 -20.65 -20.87 -21.10 -21.32 -21.55 -21.77 -24 -22.00 -22.22 -22.45 -22.67 -22.90 -23.12 -23.35 -23.57 -23.80 -24.02 -25 -24.25 -24.47 -24.70 -24.92 -25.15 -25.37 -25.60 -25.82 -26.05 . -26.27 -26 -26.50 -26.72 -26.95 -27.17 -27.40 -27.62 -27.85 -28.07 -28.3% -28.52 -27 -28.75 -28.97 -29.20 -29.42 -29.65 -29.87 -30.10 -30.32 -30.55 -30.77 -28 -31.00 -31.22 -31.45 -31.67 -31.90 -32.12 -32.35 -32.57 -32.80 -33.02 -29 -33.25 -33.47 -33.70 -33.92 -34.15 -34.37 -34.60 -34.82 ~35-OB.: -33.27 -30 -35.50 -35.72 -35.95 -36.17 -36.40 -36.62 -36.85 -37.07 -37.30 -37.52 -31 -37.75 -37.97 -38.20 -38.42 -38.65 -38.87 -39.10 -39.32 -39.55 -39.77 -32 -40.00 -40.22 -40.45 -40.67 -40.90 -41.12 -41.35 -41.57 -41.80 -42.02 -33 -42.25 -42.47 -42.70 -42.92 -43.15 -43.37 -43.60 -43.82 -44.05 -44.27 -34 -44.50 -44.72 -44.95 -45.17 -45.40 -45.62 -45.85 -46.07 -46.30 -46.52 -35 -46.75 -46.97 -47.20 -47.42 -47.65 -47.87 -48.10 -48.32 -48.55 -48.77 -36 -49.00 -49.22 -49.45 -49.67 -49.90 -50.12 -50.35 -50.57 -50.80 -51.02 -37 -51.25 -51.47 -51.70 -51.92 -52.15 -52.37 -52.60 -52.82 -53.05 -53.27 -38 -53.50 -53.72 -53.95 -54.17 -54.40 -54.62 -54.85 -55.07 -55.30 -55.52 -39 -55.75 -55.97 -56.20 -56.42 -56.65 -56.87 -57.10 -57.32 -57.55 -57.77 0. 1. 2. 3. 4. 5. 6. ?. 8. 9- 31 1A. CONVERSION OF DEGREES OF REAUMUR INTO CENTIGRADE DEGREES. Degrees of Reaumur. Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. ±40 Centig. ±50.00 Centig. ±50.13 Centig. ±50.25 Centig. ±50.38 Centig. ±50.50 Centig. ±50.63 Centig. ±50.75 Centig. ±50.88 Centig. ±51.00 Centig. ±51.13 39 48.75 48.88 49.00 49.13 49.25 49.38 49.50 49.63 49.75 49.88 38 47.50 47.63 47.75 47.88 48.00 48.13 48.25 48.38 48.50 48.63 37 46.25 46.38 46.50 46.63 46.75 46.88 47.00 47.13 47.25 47.38 36 45.00 45.13 45.25 45.38 45.50 45.63 45.75 45.88 46.00 46.13 35 43.75 43.88 44.00 44.13 44.25 44.38 44.50 44.63 44.75 44.88 34 42.50 42.63 42.75 42.88 43.00 43.13 43.25 43.38 43.50 43.63 33 41.25 41.38 41.50 41.63 41.75 41.88 42.00 42.13 42.25 42.38 32 40.00 40.13 40.25 40.38 40.50 40.63 40.75 40.88 41.00 41.13 31 38.75 38.88 39.00 39.13 39.25 39.38 39.50 39.63 39.75 39.88 30 37.50 37.63 37.75 37.88 38.00 38.13 38.25 38.38 38.50 38.63 29 36.25 36.38 36.50 36.63 36.75 36.88 37.00 37.13 37.25 37.38 28 35.00 35.13 35.25 35.38 35.50 35.63 35.75 35.88 36.00 36.13 27 33.75 33.88 34.00 34.13 34.25 34.38 34.50 34.63 34.75 34.88 26 32.50 32.63 32.75 32.88 33.00 33.13 33.25 33.38 33.50 33.63 25 31.25 31.38 31.50 31.63 31.75 31.88 32.00 32.13 32.25 32.38 24 30.00 30.13 30.25 30.38 30.50 30.63 30.75 30.88 31.00 31.13 23 28.75 28.88 29.00 29.13 29.25 29.38 29.50 29.63 29.75 29.88 22 27.50 27.63 27.75 27.88 28.00 28.13 28.25 28.38 28.50 2863 21 26.25 26.38 26.50 26.63 26.75 26.88 27.00 27.13 27.25 27.38 20 25.00 25.13 25.25 25.38 25.50 25.63 25.75 25.88 26.00 26.13 19 23.75 23.88 24.00 24.13 24.25 24.38 24.50 24.63 24.75 24.88 18 22.50 22.63 22.75 22.88 23.00 23.13 23.25 23.38 23.50 23.63 17 21.25 21.38 21.50 21.63 21.75 21.88 22.00 22.13 22.25 22.38 16 20.00 20.13 20.25 20.38 20.50 20.63 20.75 20.88 21.00 21.13 15 18.75 18.88 19.00 19.13 19.25 19.38 19.50 19.63 19.75 19.88 14 17.50 17.63 17.75 17.88 18.00 18.13 18.25 18.38 18.50 18.63 13 16.25 16.38 16.50 16.63 16.75 16.88 17.00 17.13 17.25 17.38 12 15.00 15.13 15.25 15.38 15.50 15.63 15.75 15.88 16.00 16.13 11 13.75 13.88 14.00 14.13 14.25 14.38 14.50 14.63 14.75 14.88 10 12.50 12.63 12.75 12.88 13.00 13.13 13.25 13.38 13.50 13.63 9 11.25 11.38 11.50 11.63 11.75 11.88 12.00 12.13 12.25 12.38 8 10.00 10.13 10.25 10.38 10.50 10.63 10.75 10.88 11.00 11.13 7 8.75 8.88 9.00 9.13 9.25 9.38 9.50 9.63 9.75 9.88 6 7.50 7.63 7.75 7.88 8.00 8.13 8.25 8.38 8.50 8.63 5 6.25 6.38 6.50 6.63 6.75 6.88 7.00 7.13 7.25 7.38 4 5.00 5.13 5.25 5.38 5.50 5.63 5.75 5.88 6.00 6.13 3 3.75 3.88 4.00 4.13 4.25 4.38 4.50 4.63 4.75 4.88 ' 2 2.50 2.63 2.75 2.88 3.00 3.13 3.25 3.38 3.50 3.63 1 1.25 1.38 1.50 1.63 1.75 1.88 2.00 2.13 2.25 2.38 0 0.00 0.13 0.25 0.38 0.50 0.63 0.75 0.88 1.00 1.13 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. X.-XV. TABLES FOR COMPARING THERMOMETRICAL DIFFERENCES EXPRESSED IN DEGREES OF DIFFERENT SCALES, IRRESPECTIVE OF THEIR ZERO POINT. 33 X. NUMBER OF DEGREES OF FAHRENHEIT = NUMBER OF CENTIGRADE DEGREES. 4° Reaumur = 5* Centigrade = 9° Fahrenheit. Tenths of a Degree. Decrees of Fahren- heit. o. 1. 2. 3. 4. 5. 6. 7. 8. 9. Centig. Centig. Centig. Centig. Centig. Centig. Centig. Centig. Centig. Centig. 0 0.00 0.06 0.11 0.17 0.22 0.28 0.33 0.39 0.44 0.50 1 0.56 0.61 0.67 0.72 0.78 0.83 0.89 0.94 1.00 1.06 2 1.11 1.17 1.22 1.28 1.33 1.39 1.44 1.50 1.56 1.61 3 1.67 1.72 1.78 1.83 1.89 1.94 2.00 2.06 2.11 2.22 4 2.22 2.28 2.33 2.39 2.44 2.50 2.56 2.61 2.67 2.72 5 2.78 2.83 2.89 2.94 3.00 3.06 3.11 3.17 3.22 3.28 6 3.33 3.39 3.44 3.50 3.56 3.61 3.67 4.72 3.78 3.83 7 3.89 3.94 4.00 4.06 4.11 4.17 4.22 4.28 4.33 4.39 8 4.44 4.50 4.56 4.61 4.67 4.72 4.78 4.83 4.89 4.94 9 5.00 5.06 5.11 5.17 5.22 5.28 5.32 5.39 5.44 5.50 XI. NUMBER OF DEGREES OF FAHRENHEIT = NUMBER OF DEGREES OF REAUMUR. Degrees Tenths of a Degree. of Fahren- heit. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0 Reaumur. 0.00 Reaumur. 0.04 Reaumur. 0.09 Reaumur. 0.13 Reaumur. 0.18 Reaumur. 0.22 Reaumur. 0.27 Reaumur. 0.31 Reaumur. 0.36 Reaumur. 040 1 0.44 0.49 0.53 0.58 0.62 0.67 0.71 0.76 0.80 0.84 2 0.89 0.93 0.98 1.02 1.07 1.11 1.16 1.20 1.24 1.29 3 1.33 1.38 1.42 1.47 1.51 1.56 1.60 1.64 1.69 1.73 4 1.78 1.82 1.87 1.91 1.96 2.00 2.04 2.09 2.13 2.18 5 2.22 2.27 2.31 2.36 2.40 2.44 2.49 2.53 2.58 2.62 6 2.67 2.71 2.76 2.80 2.84 2.89 2.93 2.98 3.02 3.07 7 3.11 3.16 3.20 3.24 3.29 3.33 3.38 3-42 3.47 3.51 8 3.56 3.60 3.64 3.69 3.73 3.78 3.82 3.87 3.91 3.96 9 4.00 4.04 4.09 4.13 4.18 4.22 4.27 4.31 4.36 4.40 XII. NUMBER OF CENTIGRADE DEGREES = NUMBER OF DEGREES OF REAUMUR. Tenths of a Degree. Centig. Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0 Reaumur. 0.00 Reaumur 0.08 Reaumur. 0.16 Reaumur. 0.24 Reaumur. 0.32 Reaumur. 0.40 Reaumur. 0.48 Reaumur 0.56 Reaumur. 0.64 Reaumur. 0.72 1 0.80 0.88 0.96 1.04 1.12 1.20 1.28 1.36 1.44 1.52 2 1.60 1.68 1.76 1.84 1.92 2.00 2.08 2.16 2.24 2.32 3 2.40 2.48 2.56 2.64 2.72 2.80 2.88 2.96 3.04 3.12 4 3.20 3.28 3.36 3.44 3.52 3.60 3.68 3.76 3.84 3.92 5 4.00 4.08 4.16 4.24 4.32 4.40 4.48 4.56 4.64 4.72 6 4.80 4.88 4.96 5.04 5.12 5.20 5.28 5.36 5.44 5.52 7 5.60 5.68 5.76 5.84 5.92 6.00 6.08 6.16 6.24 6.32 8 6.40 6.48 6.56 6.64 6.72 6.80 6.88 M* 7.04 7.12 9 T20 7.28 ".36 7.44 7.52 *.60 7.68 7.76 7.84 7.92 34 XIII. NUMBER OF CENTIGRADE DEGREES — NUMBER OF DEGREES OF FAHRENHEIT. 4° Reaumur = 5° Centigrade = 9s Fahrenheit. Centig. Degrees. Tenths of a Degree. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Fahr. Fahr. Fahr. Fahr. Fahr. Fahr. Fahr. Fahr. Fahr. Fahr. 0 0.00 0.18 0.36 0.54 0.72 0.90 1.08 1.26 1.44 1.62 1 1.80 1.98 2.16 2.34 2.52 2.70 2.88 3.06 3.24 3.42 2 3.60 3.78 3.96 4.14 4.32 4.50 4.68 4.86 5.04 5.22 3 5.40 5.58 5.76 5.94 6.12 6.30 6.48 6.66 6.84 7.02 4 7.20 7.38 7.56 7.74 7.92 8.10 8.28 8.46 8.64 8.82 5 9.00 9.18 9.36 9.54 9.72 9.90 10.08 10.26 10.44 10.62 6 10.80 10.98 11.16 11.34 11.52 11.70 11.88 12.06 12.24 12.42 7 12.60 12.78 12.96 13.14 13.32 13.50 13.68 13.86 14.04 14.22 8 14.40 14.58 14.76 14.94 15.12 15.30 15.48 15.66 15.84 16.02 9 16.20 16.38 16.56 16.74 16.92 17.10 17.28 17.46 17.64 17.82 XIV. NUMBER OF DEGREES OF REAUMUR = NUMBER OF CENTIGRADE DEGREES. Degrees of Reaum. Tenths of a Degree. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0 Centig. 0.00 Centig. 0.12 Centig. 0.25 Centig. 0.37 Centig. 0.50 Centig. 0.62 Centig. 0.75 Centig. 0.87 Centig. 1.00 Centig. 1.12 1 1.25 1.37 1.50 1.62 1.75 1.87 2.00 2.12 2.25 2.37 2 2.50 2.62 2.75 2.87 3.00 3.12 3.25 3.37 3.50 3.62 3 3.75 3.87 4.00 4.12 4.25 4.37 4.50 4.62 4.75 4.87 4 5.00 5.12 5.25 5.37 5.50 5.62 5.75 5.87 6.00 6.12 5 6.25 6.37 6.50 6.62 6.75 6.87 7.00 7-12 7.25 7.37 6 7.50 7.62 7.75 7.87 8.00 8.12 8.25 8.37 8.50 8.62 7 8.75 8.87 9.00 9.12 9.25 9.37 9.50 9.62 9.75 9.87 8 10.00 10.12 10.25 10.37 10.50 10.62 10.75 10.87 11.00 11.12 9 11.25 11.37 11.50 11.62 11.75 11.87 12.00 12.12 12.25 12.37 XV. NUMBER OF DEGREES OF REAUMUR = NUMBER OF DEGREES OF FAHRENHEIT. Degrees of Reaum. Tenths of a Degree. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Fahr. Fahr. Fahr. Fahr. Fahr. Fahr. Fahr. Fahr. Fahr. Fahr. 0 0.00 0.22 0.45 0.67 0.90 1.12 1.35 1.57 1.80 2.02 1 2.25 2.47 2.70 2.92 3.15 3.37 3.60 3.82 4.05 4.27 2 4.50 4.72 4.95 5.17 5.40 5.62 5.85 6.07 6.30 6.52 3 6.75 6.97 7.20 7.42 7.65 7.87 8.10 8.32 8.55 8.77 4 9.00 9.22 9.45 9.67 9.90 10.12 10.35 10.57 10.80 11.02 5 11.25 11.47 11.70 11.92 12.15 12-37 12.60 12.82 13.05 13.27 6 13.50 13.72 13.95 14.17 14.40 14.62 14.85 15.07 15.30 15.52 7 15.75 15.97 16.20 16.42 16.65 16.87 17.10 17.32 17.55 17.77 8 18.00 18.22 18.45 18.67 18.90 19.12 19.35 19.57 19.80 20.02 9 20.25 20.47 20.70 20.92 21.15 21.37 21.60 21.82 22.05 22.27 35 METEOROLOGICAL TABLES II. HYGROMETRICAL TABLES. B CONTENTS. (The figures refer to the folio at the bottom of the page.) PRACTICAL TABLES BASED ON REGNAULT'S HYGROMETRICAL CONSTANTS. a. In French Measures. Page TABLE I. Elastic Force of Aqueous Vapor, by Regnault .... 9 " II. Psychrometrical Tables, by Haeghens ..... 12 " III. For deducing the Relative Humidity from the Indications of Dew- Point Instruments, by Haeghens . ^ "• • . . , . 30 100 IV. Factor -^- for computing Relative Humidity . . . . 36 " V. Weight of Vapor contained in a Cubic Metre of Air . . .38 b. In English Measures. " VI. Elastic Force of Vapor, reduced from Regnault's Table . . 43 " VII. Psychrometrical Tables, by A. Guyot . * , . . .46 " VIII. For deducing the Relative Humidity from the Indications of Dew- Point Instruments, by A. Guyot . . *- . . . 73 IX. Factor -p-, for computing Relative Humidity . . . 88 " X. Weight of Vapor in a Cubic Foot of Saturated Air v . . 92 PRACTICAL TABLES BASED ON THE HYGROMETRICAL CONSTANTS ADOPTED IN THE GREENWICH OBSERVATIONS. TABLE XI. Elastic Force of Aqueous Vapor . . . . . 99 " XII. Psychrometrical Tables, by Glaisher V . . . .102 • " XIII. Factors for computing the Force of Vapor from Psychrometrical Observations, by Apjohn's Formula . . . . . 138 " XIV. Factors for finding the Temperature of the Dew-Point from the Readings of the Psychrometer ...... 140 " XV. Weight of Vapor contained in a Cubic Foot of Saturated Air . 141 " XVI. Factors for deducing the Weight of Vapor from the Indications of Dew-Point Instruments . . •» 141 " XVII. For comparing the Weight of a Cubic Foot of Dry and of Satu- rated Air * . . . • 142 " XIV. Factors for finding the Temperature of the Dew-Point from the Readings of the Psychrometer ...... 144 B 3 CONTENTS. MISCELLANEOUS TABLES FOR COMPARISON. TABLE XVIII. Elastic Force of Vapor, expressed in Millimetres, by August . 44 XIX. Elastic Force of Vapor, expressed in Millimetres, by Kaemtz " XX. Elastic Force of Vapor, expressed in Millimetres, by Magnus " XXI. Elastic Force of Vapor, in English Inches, from the Royal Society's Report .- _» " XXII. For showing the Differences in the Values of the Elastic Force of Vapor adopted by different Authorities .... 44 XXIII. Weight of Vapor, in Grammes, contained in a Cubic Metre of Saturated Air, by Pouillet V" ..... " XXIV. Weight of Vapor, in Grammes, contained in a Cubic Metre of Air, by Kaemtz . . . . , • . 44 XXV. Force of Vapor and Relative Humidity corresponding to the Degrees of Saussure's Hair-Hygrometer, by Gay-Lussac 44 XXVI. For deducing the Relative Humidity from the Indications of Saussure's Hair- Hygrometer, by Haeghens ' v '',/ 44 XXVII. Relative Humidity corresponding to the Degrees of Saussure's Hygrometer, by Kaemtz . . . . ..«.,/•.„• Page 148 150 150 151 152 ,54 154 155 156 157 APPENDIX. FOR COMPARING QUANTITIES OF RAIN-WATER GIVEN IN DIFFERENT MEASURES. TABLE I. Conversion of Centimetres into English Inches -,».V 'f< . " II. Conversion of Centimetres into French Inches and Lines 44 III. Conversion of English Inches into Centimetres . • . " IV. Conversion of English Inches into French Inches and Lines 14 V. Conversion of French Inches and Lines into Centimetres 44 VI. Conversion of French Inches and Lines into English Inches 162 162 163 163 164 165 B HY GEOMETRICAL TABLES. HYGROMETERS, or instruments used for determining the amount of aqueous vapor present in the air, are of three classes. In the first, we find the hygrometers based on the absorption of moisture by hygroscopic substances, the best of which is Saussure's Hair-Hygrometer ; in the second class, the Psychrometer, or wet-bulb thermometer, which gives the temperature of evaporation ; in the third, the various instruments designed for ascertaining the temperature of the dew-point. From the data furnished by each of these instruments, and a table of the elastic forces of vapor at different temperatures, the humidity of the air can be deduced with more or less accuracy. The use of the hygroscopic substances as hygrometers having been nearly given up on account of the inaccuracy of the results, the variability of the instruments, and the difficulty, if not impossibility, of making them comparable, the psychrometer and the dew-point instruments represent the two methods now usually employed in Meteorology. The following set, therefore, contains extensive tables, in French and English measures, for deducing the hygrometrical condition of the atmosphere from the indications of the Psychrometer and of the dew-point instruments, to which have been added tables of the weight of vapor, in a given space, at different temperatures, — an element often needed in Meteorology. As, however, the results deduced from the same data furnished by the observations may considerably differ, according to the values of the elastic force of vapor, and the formulae used in the computation, the tables have been arranged in two series. The first series contains Regnault's table of the elastic forces of vapor, with tables of the three kinds above mentioned, together with a corresponding set in English measures. Tables V. to X. have been computed for this volume. The second series gives the table of elastic forces of vapor deduced from Dalton's experiments, and adopted in the Greenwich Observations, together with the various tables based on it. B 5 HYGROMETRICAL TABLES. A third series of miscellaneous tables furnishes the means of comparing the differ- ent values of the elastic force and weight of vapor determined by various physicists, as well as the results of Saussure's Hair- Hygrometer, with those obtained by other methods. An Appendix, containing tables for comparing the quantity of rain-water indicated in different measures, closes the set. Though the first series of tables, based on Regnault's table of tensions, is recom- mended for ordinary use, as being derived from the determinations which seem to deserve the greatest degree of confidence, it was thought expedient to give also the Greenwich tables, which have been, and still are, so extensively used in England, in order to enable meteorologists to judge of the differences which exist between the results obtained by them and those deduced from the constants of Regnault and others. B PRACTICAL TABLES, FRENCH MEASURES, BASED ON REGNAULTS HYGROMETRICAL CONSTANTS. B TABLE OF THE ELASTIC FORCE OF AQUEOUS VAPOR, EXPRESSED IN MILLIMETRES OF MERCURY FOR CENTIGRADE TEMPERATURES, BY REGNAULT. THIS table contains the elastic forces of vapor corresponding to every tenth of a degree of temperature between — 35° and -|-400 Centigrade, as determined by the experiments of V. Regnault, made by order of the French government, for the purpose of establishing the numerical value of the elements which enter into the computations concerning the steam-engine. These results are generally considered as the most accurate science possesses at present. They are published in the Memoires de Vlnstitut, Tom. XXI. ; and more correctly in Regnault's Etudes sur VHygrometrie, in the Annales de Cliimie et de Physique. In Vol. XV. Regnault gives the table of elastic forces for every tenth of a degree from — 10° to -|- 35° Centigrade, which is reprinted in Table I. The numbers below — 10° and above -f- 35°, in the same table, have been taken from another table for every full degree, previously published in Vol. XI. p. 333 of the same periodical, and in the same volume of the Memoires de Tlnstitut^ extending from — 32° to -(-230°. It should be remarked, however, that the numbers below zero, in the two tables just mentioned, having been computed from different formulas of interpolation, slightly disagree. In order to establish a continuity, therefore, the numbers in Table I. cor- responding to full degrees from — 10° to — 35° have been formed by starting from the value due to — 10° in the larger table of Regnault, and subtracting from it the difference between — 10° and — 11° in the other table, in order to find the value of — 11°, and so on, by subtracting successively the corresponding differences to — 35°. For the fractions of degrees below — 10°, the mean values have been adopted as sufficiently accurate for meteorological purposes. I. ELASTIC FORCE OF AQUEOUS VAPOK, EXPRESSED IN MILLIMETRES OF MERCURY FOR CENTIGRADE TEMPERATURES. BY REGNAULT. Tempera- Tenths of Degrees. ture Centigrade. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. o -35 Millim. 0.221 Millim. 0.219 Millim. 0.216 Millim. 0.214 Millim. 0.211 Millim. 0.209 Millim. 0.207 Millim. 0.204 Millim. 0.202 Millim. 0.199 -34 0.247 0.244 0.242 0.249 0.237 0.234 0.231 0.229 0.226 0.224 -33 0.275 0.272 0.269 0.267 0.264 0.261 0.258 0.255 0.253 0.250 -32 0.305 0.302 0.299 0.296 0.293 0.290 0.287 0.284 0.281 0.278 -31 0.337 0.334 0.331 0.327 0.324 0.321 0.318 0.315 0.311 0.308 -30 0.371 0.368 0.364 0.361 0.357 0.354 0.351 0.347 0.344 0.340 -29 0.409 0.405 0.401 0.398 0.394 0.390 0.386 0.382 0.379 0.375 -28 0.449 0.445 0.441 0.437 0.433 0.429 0.425 0.421 0.417 0.413 -27 0.493 0.489 0.484 0.480 0.475 0.471 0.467 0.462 0.458 0.453 -26 0.540 0.535 0.531 0.526 0.521 0.516 0.512 0.507 0.502 0.498 -25 0.590 0.585 0.580 0.575 0.570 0.565 0.560 0.555 0.550 0.545 -24 0.645 0.639 0.634 0.628 0.623 0.617 0.612 0.606 0.601 0.595 -23 0.704 0.698 0.692 0.686 0.680 0.674 0.669 0.663 0.657 0.651 -22 0.768 0.762 0.755 0.749 0.742 0.736 0.730 0.723 0.717 0.710 -21 0.838 0.831 0.824 0.817 0.810 0.803 0.796 0.789 0.782 0.775 -20 0.912 0.905 0.897 0.890 0.882 0.875 0.868 0.860 0.853 0.845 -19 0.993 0.985 0.977 0.969 0.961 0.952 0.944 0.936 0.928 0.920 -18 .080 1.071 .063 1.054 1.045 .036 1.028 1.019 .010 .002 -17 .174 1.165 .155 1.146 1.136 .127 1.118 1.108 .099 .089 -16 .275 1.265 .255 1.245 1.235 .224 1.214 1.204 .194 .184 -15 .385 1.374 .363 1.352 1.341 .330 1.319 1.308 .297 .286 -14 .503 1.491 .479 1.468 1.456 .444 1.432 1.420 .409 .397 -13 .631 1.618 .605 1.593 1.580 .567 1.554 1.541 .529 .516 -12 .768 1.754 .741 1.737 1.713 .699 1.686 1.672 .658 .645 -11 .918 1.903 1.888 1.873 1.858 .843 1.828 1.813 .798 .783 -10 2.078 2.062 2.046 2.030 2.014 1.998 1.982 1.966 1.950 1.934 - 9 2.261 2.242 2.223 2.204 2.186 2.168 2.150 2.132 2.114 2.096 - 8 2.456 2.436 2.416 2.396 2.376 2.356 2.337 2.318 2.299 2.280 - 7 2.666 2.645 2.624 2.603 2.582 2.561 2.540 2.519 2.498 2.477 - 6 2.890 2.867 2.844 2.821 2.798 2.776 2.754 2.732 2.710 2.688 - 5 3.131 3.106 3.082 3.058 3.034 3.010 2.986 2.962 2.938 2.914 - 4 3.387 3.361 3.335 3.309 3.283 3.257 3.231 3.206 3.181 3.156 - 3 3.662 3.634 3.606 3.578 3.550 3.522 3.495 3.468 3.441 3.414 - 2 3.955 3.925 3.895 3.865 3.836 3.807 3.778 3.749 3.720 3.691 - 1 4.267 4.235 4.203 4.J71 4.140 4.109 4.078 4.047 4.016 3.985 - 0 4.600 4.565 4.531 4.497 4 463 4.430 4.397 4.364 4.331 4.299 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. B 10 ELASTIC FORCE OF AQUEOUS VAPOR. REGNAUL1. Tenths of Degrees. Centigrade Degrees, 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0 Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 4.600 4.633 4.667 4.700 4.733 4.767 4.801 4.836 4.871 4.905 1 4.940 4.975 5.011 5.047 5.082 5.118 5.155 5.191 5.228 5.265 2 5.302 5.340 5.378 5.416 5.454 5.491 5.530 5.569 5.608 5.647 3 5.687 5.727 5.767 5.807 5.848 5.889 5.930 5.972 6.014 6.055 4 6.097 6,140 6.183 6.226 6.270 6.313 6.357 6.401 6.445 6.490 5 6.534 6.580 6.625 6.671 6.717 6.763 6.810 6.857 6.904 6.951 6 6.998 7.047 7.095 7.144 7.193 7.242 7.292 7.342 7.392 7.442 7 7.492 7.544 7.595 7.647 7.699 7.751 7.804 7.857 7.910 7.964 8 8.017 8.072 8.126 8.181 8.236 8.291 8.347 8.404 8.461 8.517 9 8.574 8.632 8.690 8.748 8.807 8.865 8.925 8.985 9.045 9.105 10 9.165 9.227 9.288 9.350 9.412 9.474 9.537 9.601 9.665 9.728 11 9.792 9.857 9.923 9.989 10.054 10.120 10.187 10.255 10.322 10.389 12 10.457 10.526 10.596 10.665 10.734 10.804 10.875 10.947 11.019 11.090 13 11.162 11.235 11.309 11.383 11.456 11.530 11.605 11.681 11.757 11.832 14 11.908 11.986 12.064 12.142 12.220 12.298 12.378 12.458 12.538 12.619 15 12.699 12.781 12.864 12.947 13.029 13.112 13.197 13.281 13.366 13.451 16 18.536 13.623 13.710 13.797 13.885 13.972 14.062 14.151 14.241 14.331 17 lt.421 14.513 14.605 14.697 14.790 14.882 14.977 15.072 15.167 15.262 18 U.357 15.454 15.552 15.650 15.747 15.845 15.945 16.045 16.145 16.246 19 16346 16.449 16.552 16.655 16.758 16.861 16.967 17.073 17.179 17.285 20 17391 17.500 17.608 17.717 17.826 17.935 18.047 18.159 18.271 18.383 21 18.195 18.610 18.724 18.839 18.954 19.069 19.187 19.305 19.423 19.541 22 19.659 19.780 19.901 20.022 20.143 20.265 20.389 20.514 20.639 20.763 23 20.8*8 21.016 21.144 21.272 21.400 21.528 21.659 21.790 21.921 22.053 24 22.184 22.319 22.453 22.588 22.723 22.858 22.996 23.135 23.273 23.411 25 23.55) 23.692 23.834 23.976 24.119 24.261 24.406 24.552 24.697 24.842 26 24.988 25.138 25.288 25.438 25.588 25.738 25.891 26.045 26.198 26.351 27 26.505 26.663 26.820 26.978 27.136 27.294 27.455 27.617 27.778 27.939 28 28.101 28.267 28.433 28.599 28.765 28.931 29.101 29.271 29.441 29.612 29 29.782 29.956 30.131 30.305 30.479 30.654 30.833 31.011 31.190 31.369 30 31.548 U.729 31.911 32.094 32.278 32.463 32.650 32.837 33.026 33.215 31 33.406 £.596 33.787 33.980 34.174 34.368 34.564 34.761 34.959 35.159 32 35.359 31559 35.760 35.962 36.165 36.370 36.576 36.783 36.991 37.200 33 37.410 37621 37.832 38.045 38.258 38.473 38.689 38.906 39.124 39.344 34 39.565 39*86 40.007 40.230 40.455 40.680 40.907 41.135 41.364 41.595 35 41.827 42 £9 42.293 42.527 42.763 43.000 43.238 43.477 43.717 43.959 36 44.201 44.4\5 44.690 44.936 45.183 45.431 45.681 45.932 46.184 •16.437 37 46.691 46.9^ 47.203 47.462 47.721 47.981 48.243 48.506 48.770 49.035 38 49.302 49.57\ 49.839 50.110 50.382 50.655 50.929 51.205 51.481 51.759 1 39 52.039 52.32<\ 52.602 52.885 53.170 53.456 53.743 54.032 54.322 54.613 \ 40 54.906 55.200\ 55.496 55.793 56.091 56.391 56.692 56.994 57.298 57.603 0. -\»- 3. 4. 3. 6. •7. 8. 9. 11 II. PSYCHROMETRICAL TABLES. GIVING IMMEDIATELY THE FORCE OF AQUEOUS VAPOR AND THE RELATIVE H7MIDITY FROM THE INDICATIONS OF THE PSYCHROMETER. CALCULATED BY M. T. HAEGHENS. IN his Etudes sur VHygromitrie* M. V. Regnault discusses the theoretical bases of the formula of the Psychrometer, given by M. August, which was, x ^f _ Q-S63 (*_-/) A> in which h represents the height of the barometer ; t the temperature of the air given by the dry-bulb thermometer ; t' the temperature of the wet-bulb thermometer ; f the force of aqueous vapor in the saturated air at a temperature equal to t' ; x the elastic force of aqueous vapor which exists in the air at the time of the observation, After having modified some of the numerical values, which form the coefficients, M. Regnault adopted this formula, f But comparative experiments, made by himself, showed that by substituting the coefficient 0.480 for that of 0.429, the calculated results, and those obtained by direct observation, agree perfectly in the fractions of saturation, which are greater than 0.40. This formula thus modified, or n 0.480 (t — t1) -, X / " 610 — f *« has been used for calculating the following tables. In that part of tfo tables which supposes the wet- bulb to be covered with a film of ice, or below the freezing point, the value 610 — t', which represents the latent heat of aqueous vipor, has been changed into this : 6 10 + 79 — t1 = 689 — t1. The only hypothesis made, is that of a mean barometric pressure A, equal to 755 millimetres. If we take into account the causes of errors inherent to the psychrom- eter, and to the tables of the force of vapor, by means of which the absolute force of vapor is calculated, as well as to the differences of these tensions, taken at tempera- tures differing only by one tenth of a degree, it will be obvious tha the correction due to the variations of barometric pressure can almost always be neglected. Neverthe- less, a separate table has been calculated, giving the correction o be applied to the numbers in the Psychrometrical Tables for the heights of the barometer between 650 and 800 millimetres. It will be found at the end of the tables. The* disposition of the tables is the following : — The temperatures are noted in centigrade degrees ; the elastc force of vapor in the air, or its pressure on the barometer, is expressed in millimetes of mercury ; the rel- * Etvdes sur V Hygrometrie, par M. V. Kegnault. Annales de Chimie elde Physique, 3me Serie, Tom XV., 1845. B 12 PSYCHROMETRICAL TABLES. ative humidity is indicated in per cent, of the full saturation of the air at the corre- sponding temperature of the dry-bulb thermometer t. The first vertical column contains the indications of the wet-bulb thermometer £', beginning with the temperatures below the freezing point, when the bulb is covered with ice, from — 35°, and continuing from the freezing point up to +35° centigrade, the bulb being simply wet. The second column gives the differences of the force of vapor for each tenth (0°.l) of a degree, between each full degree of the first column. It enables the observer to find out the correction for any fraction of a degree of the wet-bulb thermometer. The following double columns give immediately the force of vapor and the relative humidity, corresponding to each degree of the wet-bulb, placed in the first column, on the same horizontal line, and to differences of the two thermometers, or to t — £', taken at every two tenths of a degree. The horizontal column at the bottom indicates the mean difference, for each tenth of a degree, of the force of vapor contained in the same horizontal line. It gives the correction for the intermediate differences of the thermometers; 0.1, 0.3, 0.5, 0.7, 0.9, &c., &c. To meet the wants arising from the extreme climate of North America, the tables of Mr. Haeghens have been extended from — 15° to — 35° centigrade, and from +30° to +35° of temperature of the wet-bulb, and to +40° of temperature of the dry-bulb thermometer. The forces of aqueous vapor of Regnault, as given in Table I., have been used for the calculations. Use of the Talks. Enter the tables with the difference of the two thermometers, or t — £', and with the temperature of the wet-bulb thermometer Z', taking the first three pages, when the temperature of the wet-bulb is below the freezing point ; and the following ones when it is above the freezing point. Seek first the column at the head of which you find the difference of the thermom- eters ; go down as far as the horizontal line, at the beginning of which you see the temperature of the wet-bulb thermometer ; there you find the force of vapor, and the relative humidity corresponding to your observation. Two corrections for fractions may be required for a complete calculation of the force of vapor ; one for the fractions of degrees of the wet-bulb thermometer ; anoth- er for the intermediate differences of the two thermometers, viz. for 0.1, 0.3, 0.5, 0.7, &c. The first correction for fractions of degrees of the wet-bulb thermometer is found by multiplying the decimal fraction by the number placed in the second vertical column next to the whole degree, which number is the value of a tenth of a degree. The product must be added to the value of the full degree given in the table, when the tem- perature of the wet-bulb is above the freezing point : it must be subtracted when the temperature is below the freezing point, and receives the sign — . This correction is too important to be neglected. The second correction, less important, for the intermediate differences of the ther- B 13 PSYCHROMETR1CAL TABLES. mometers, which are greater by one tenth than those indicated in the tables, is given in the horizontal, column at the bottom of the page. It is constant and always sub' tractive. Examples of Calculation. Difference of thermometers, or t — t' = 0°.8. Temperature of the wet-bulb thermometer, t' = 11°.0. We find, page 18, for t — Z', fifth double column ; and for t', first column, The force of vapor in the air = 9mm'.31. Relative humidity, = 90. Difference of thermometers, or t — £', = 7°. 2. Wet-bulb thermometer, or <', = 17°.9. We find, page 24, for t — t', = 7°.2, and t1 = 17°.0, force of vapor 10mm\02. Additive correction for fraction 0°.9, or 9 X 0.09 = 0 .81. Force of vapor in the air = 10 .83. Relative humidity, 46 Difference of thermometers, t — t' = 6°.5. Wet-bulb thermometer, t' = 23°.6. We find, page 23, for t' = 23°.0, and t — t', or difference, = 6°.4, force of vapoi 16mm .94 ; applying immediately the correction found at the bottom of the page for one tenth more difference, or 6°.4 -\- 0.1 = 6°. 5, we have, Force of vapor = 16mm\94 — 0.06, or 16mm-.88. Additive correction for fraction 0.6 of the wet-bulb, 6 X 0.13 = 0 .78. Force of vapor in the air = 17 .66. Relative humidity, 56. The wet-bulb thermometer covered with ice. Difference of thermometers, t — t1 = 2°.8. Wet-bulb thermometer (ice), t'= — 8°.5. 17 gives for t — *' = 2°.8, and t' = — 8°.0, force of vapor = lmra\0. SuUractive correction for fraction 0.5 of wet-bulb, 5 X 0.019= — 0 .1. Force of vapor in the air = 0 .9. Relative humidity, 30. B 14 II. PSYCHROMETRICAL TABLES. Below the Freezing-Point ; the Bulb covered with a Film of Ice. t — t', Difference of Wet and Dry Bulb Thermometers. Wet- Bulb Mean Thermo meter Vertical Difler- o°.o O°.2 0°.4 0°.G O°.8 1°.0 t' ence for Centi- grade Degrees eachO°.l Force o: Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force o: Vapor. Rela- tive Hu- mid- Force o] Vapor. Rela- tive Hu- mid- Force o: Vapor. Rela tive Hu- mid- Force o: Vanor. Rela- tive Hu- mid- ity. ity. ity. ity. ity. ity. o Millim. Millim. Millim. Millim. Millim Millim. Millim. -35 0.22 100 0.12 53 -34 0.003 0.25 100 0.15 58 0.05 18 0.003 -33 0.27 100 0.17 62 0.07 26 -32 0.003 0.30 100 0.20 66 0.10 33 -31 0.003 0.34 100 0.24 69 0.14 39 0.03 10 0.004 -30 0.37 100 0.27 71 0.17 44 0.07 17 -29 0.004 0.41 100 0.31 74 0.21 46 0.11 25 -28 0.004 0.45 100 0.35 76 0.25 53 0.15 31 0.04 9 -27 0.004 0.49 100 0.39 78 0.29 57 0.19 36 0.09 17 -26 0.005 0.54 100 0.44 80 0.34 60 0.24 41 0.13 23 0.03 6 0.005 -25 0.59 100 0.49 81 0.39 63 0.29 46 0.18 29 0.08 12 -24 0.005 0.64 100 0.54 82 0.44 66 0.34 50 0.24 34 0.14 19 -23 0.006 0.70 100 0.60 84 0.50 69 0.40 53 0.30 39 0.19 25 -22 0.006 0.77 100 0.67 85 0.56 71 0.46 57 0.36 44 0.26 31 -21 0.007 0.84 100 0.74 86 0.63 73 0.53 60 0.43 48 0.33 36 O.OOS -20 0.91 100 0.81 87 0.71 75 0.61 63 0.50 51 0.40 40 -19 0.008 0.008 0.99 100 0.89 88 0.79 77 0.69 66 0.58 55 0.48 45 -18 .08 100 0.98 89 0.87 78 0.77 68 0.67 58 0.57 48 -17 0.009 0.010 .17 100 1.07 90 0.97 80 0.87 70 0.76 61 0.66 52 -16 .27 100 1.17 90 1.07 81 1.97 72 0.86 63 0.76 55 0.011 -15 .38 100 1.28 91 .18 82 .08 74 0.97 66 0.87 58 0.012 -14 0.013 .50 100 1.40 92 .30 83 .19 76 1.09 68 0.99 61 -13 .63 100 1.53 92 .42 84 .32 77 1.22 70 1.11 63 -12 0.014 0.015 .77 100 1.66 93 .56 85 .46 78 1.35 71 1.25 65 -11 .92 100 1.81 93 .71 86 .61 80 1.50 73 1.40 67 0.016 -10 2.08 100 1.97 94 1.87 87 .77 81 1.66 75 1.56 69 - 9 0.019 2.26 100 2.16 94 2.05 88 .95 82 1.85 76 1.74 71 - 8 0.021 2.46 100 2.35 94 2.25 89 2.14 83 2.04 78 1.94 73 - 7 0.023 2.67 100 2.56 94 2.46 89 2.35 84 2.25 79 2.15 74 - 6 0.024 2.89 100 2.79 95 2.68 90 2.58 85 2.47 80 2.37 76 0.025 - 5 3.13 100 3.03 95 2.92 90 2.82 86 2.71 81 2.61 77 - 4 0.028 3.39 100 3.28 95 3.18 91 3.07 87 2.97 82 2.86 78 - 3 0.029 3.66 100 3.56 96 3.45 92 3.35 87 3.24 83 3.14 79 - 2 0.031 3.96 100 3.85 96 3.75 92 3.64 88 3.54 84 3.43 80 - 1 0.033 4.27 100 4.16 96 4.06 92 3.95 89 3.85 85 3.74 81 - 0 0.034 4.60 100 4.50 96 4.40 93 4.29 89 4.19 86 4.08 82 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.05 mm. 15 PSYCHROMETRICAL TABLES. Below the Freezing-Point ; the Bulb covered with a Film of Ice. t — I/, Difference of Wet and Dry Bulb Thermometers. Wet- Bulb Thermo- Mean Vertical Q meter, Differ- M. ..* M. •<•; J. »O M. »9 /£ •" if> • •£ t' Centi- grade ence for eachO°.l Rela- Rela- Rela- Rela- Rela- Rela- Degrees Force o Vapor. tive Hu- mid- Force o Vapor. tive Hu- mid- Force o Vapor. tive Hu- mid- Force o Vapor. tive Hu- mid- Force o Vapor. tive Hu- mid- Force o: Vapor. tive Hu- mid- ity. ity. ity. ity. ity. ity. 0 Millim. Millim. Millim. Millim, Millim. Millim. Millim. -35 -34 -33 -32 -31 -30 -29 -28 -27 -26 -25 -24 0.04 5 -23 0.006 0.09 12 -22 0.006 0.16 18 0.05 6 -21 0.007 0.23 24 0.12 13 0.007 -20 0.30 30 0.20 18 0.09 9 -19 O.OOS 0.38 34 0.28 25 0.17 15 0.07 6 -18 0.008 0.46 39 0.36 30 0.26 21 0.16 13 0.05 4 -17 0.009 0.56 43 0.46 35 0.35 26 0.25 18 0.15 11 0.04 3 -16 0.010 0.66 47 0.56 39 0.45 31 0.35 24 0.25 16 0.14 9 0.011 -15 0.77 50 0.66 43 0.56 36 0.46 29 0.36 22 0.25 15 -14 0.013 0.88 53 0.78 46 0.68 40 0.58 33 0.47 27 0.37 21 -IS 0.013 1.01 56 0.91 50 0.80 43 0.70 37 0.60 31 0.50 25 -12 0.015 1.15 59 1.04 53 0.94 47 0.84 41 0.73 35 0.63 30 -11 0.017 1.30 61 1.19 55 1.09 50 0.99 44 0.88 39 0.78 34 0.018 -19 1.46 63 1.35 58 1.25 52 1.15 47 1.04 42 0.94 38 - 9 0.019 1.64 G6 1.53 61 1.43 56 1.33 51 1.22 46 1.12 41 - 8 0.021 1.83 68 1.73 63 1.62 58 1.52 54 1.42 49 1.31 45 - 7 0.023 2.04 69 1.94 65 1.83 61 1.73 56 1.63 52 1.52 48 - 6 0.024 2.26 71 2.16 67 2.06 63 1.95 59 1.85 55 1.74 51 0.025 - 5 2.50 73 2.40 69 2.30 65 2.19 61 2.09 57 1.98 53 - 4 0.028 2.76 74 2.65 70 2.55 67 2.45 63 2.34 59 2.24 55 - 8 0.029 3.03 75 2.93 72 2.82 68 2.72 65 2.61 61 2.51 58 - 2 0.030 3.33 77 3.22 73 3.12 70 3.01 66 2.91 63 2.80 60 - 1 0.031 3.64 78 3.53 75 3.43 71 3.32 68 3.22 65 3.11 62 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.05 mm. B 16 PSYCHROMETRICAL TABLES. Below the Freezing-Point ; the Bulb covered with a Film of Ice. t — t', Difference of Wet and Dry Bulb Thermometers. Wet- Bulb Mean I Therino meter Vertical Differ- 2°.4 2°.6 2°.8 3°.O 3°.2 3°.4 t ence for Centi- grade Degrees each 0°.l. Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- ! tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force of Vapor. {Rela- tive Hu- mid- Force ol Vapor. (Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- ity. ity. ity. ity. ity. ity. o Millim. Millim.. Millim. Millim. Millim. Millim. Millim. -15 0.15 9 0.05 3 -14 0.011 0.27 15 0.16 9 0.06 4 -13 0.013 0.39 20 0.29 14 0.19 9 0.08 4 -12 0.013 0.53 25 0.42 19 0.32 14 0.22 10 0.11 5 -11 0.015 0.68 29 0.57 24 0.47 19 0.36 15 0.26 10 0.16 6 0.016 -10 0.83 33 0.73 28 0.63 24 0.52 20 0.42 16 0.32 12 - 9 0.018 1.02 37 0.91 33 0.81 28 0.70 24 0.60 20 0.50 17 - 8 0.019 1.21 40 1.10 36 1.00 32 0.90 28 0.79 25 0.69 21 - 7 0.0-21 1.42 44 1.31 40 1.21 36 1.11 32 1.00 29 0.90 26 - 6 0.022 1.64 47 1.54 43 1.43 40 1.33 36 1.22 33 1.12 30 0.024 - 5 1.88 50 1.77 46 1.67 43 1.57 40 1.46 36 1.36 33 J 4 0-025 2.13 52 2.03 49 1.92 46 1.82 43 1.71 40 1.61 37 - 3 0.027 2.40 55 2.30 52 2.19 48 2.09 45 1.99 43 1.88 40 - 2 0.029 2.70 57 2.59 54 2.49 51 2.38 48 2.28 46 2.17 43 - 1 0.031 3.01 59 2.90 56 2.80 54 2.69 51 2.59 48 2.48 46 3°.6 3°.S 4°.0 4°.2 4°.4 4°.6 Millim. Millim. Millim. Millim. Millim. Millim. -15 -14 -13 -12 -11 0.05 2 0.016 -10 0.21 8 0.11 4 - 9 0.018 0.39 13 0.29 9 0.19 6 0.08 3 - 8 0.019 0.58 18 0.48 14 0.38 11 0.27 8 0.17 5 0.06 2 - 7 0.021 0*022 0-79 22 0.69 19 0.59 16 0.48 13 0.38 10 0.27 7 - 6 1.01 26 0.91 23 0.81 20 0.70 17 0.60 15 0.49 12 0.024 - 5 1.25 30 1.15 27 .04 24 0.94 22 0.83 19 0.73 16 - 4 0.0-25 1.50 34 1.40 31 .30 28 1.19 26 1.09 23 0.98 20 - 3 0.027 1.78 37 1.67 34 .57 32 1.46 29 1.36 27 1.25 24 - 2 0.029 2.07 40 1.96 37 .86 35 1.75 33 1.65 30 1.54 28 0.031 2.38 43 2.27 40 .17 38 2.06 36 1.96 34 1.85 31 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.05 mm. B 17 PSYCHROMETKICAL TABLES. t — t', Difference of Wet and Dry-Bulb Thermometers. Wet- Bulb Mean Thermo Vertical o°.o 0°.2 0°.4 O°.6 O°.8 1 °.O meter, f Differ- Centi- grade Degrees ence for eachO°.l Force of Vapor. Relative Humid- ity. Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- ity. ity. ity. ity. ity. o Millim. Millim. Millim. Millim Millim. Millim. Millim. 0 4.60 100 4.48 96 4.36 92 4.24 88 4.12 85 4.01 81 1 0.03 4.94 100 4.82 96 4.70 93 4.58 89 4.46 85 4.35 82 2 0.04 5.30 100 5.18 96 5.06 93 4.94 89 4.83 86 4.71 83 3 0.04 5.69 100 5.57 97 5.45 93 5.33 90 5.21 87 5.09 83 4 0.04 6.10 100 5.98 97 5.86 93 5.74 90 5.62 87 5.50 84 5 0.04 6.53 100 6.41 97 6.29 94 6.17 91 6.05 88 5.94 85 0.05 6 7.00 100 6.88 97 6.76 94 6.64 91 6.52 88 6.40 85 7 0.05 7.49 100 7.37 97 7.25 94 7.13 91 7.01 89 6.89 86 8 0.05 8.02 100 7.90 97 7.78 94 7.66 92 7.54 89 7.42 86 9 0.06 8.57 100 8.45 97 8.33 95 8.21 92 8.09 89 7.97 86 10 0.06 9.17 100 9.04 97 8.92 95 8.80 93 8.68 90 8.56 87 0.06 11 9.79 100 9.67 97 9.55 95 9.43 93 9.31 90 9.19 88 12 0.07 10.46 100 10.34 98 10.21 95 10.09 93 9.97 90 9.85 88 13 0.07 11.16 100 11.04 98 10.92 95 10.80 93 10.68 91 10.56 89 14 0.07 11.91 100 11.79 98 11.66 95 11.54 93 11.42 91 11.30 89 I 15 0.08 12.70 100 12.58 98 12.46 96 12.33 93 12.21 91 12.09 89 ! 0.08 16 13.54 100 13.41 98 13.29 96 13.17 94 13.05 92 12.93 90 17 0.09 14.42 100 14.30 98 14.18 96 14.05 94 13.93 92 13.81 90 18 0.09 15.36 100 15.23 98 15.11 96 14.99 94 14.87 92 14.75 90 19 0.10 16.35 100 16.22 98 16.10 96 15.98 94 15.86 92 15.73 91 20 0.10 17.39 100 17.27 98 17.15 96 17.02 94 16.90 92 16.78 91 0.11 21 18.50 100 18.37 98 18.25 96 18.13 94 18.00 92 17.88 91 22 0.12 19.66 100 19.54 98 19.41 96 19.29 95 19.17 93 19.04 91 23 0.12 20.89 100 20.76 98 20.64 96 20.52 95 20.39 93 20.27 91 24 0.13 22.18 100 22.06 98 21.94 97 21.81 95 21.69 93 21.57 92 25 0.14 23.55 100 23.43 98 23.30 97 23.18 95 23.05 93 22.93 92 0.14 26 r> i^ 24.99 100 24.86 98 24.74 97 24.62 95 24.49 93 24.37 92 27 (J.10 26.51 100 26.38 98 26.26 97 26.13 95 26.01 93 25.88 92 0.16 28 a 1*7 28.10 100 27.98 98 27.85 97 27.73 95 27.60 93 27.48 92 29 .1 / 0.18 29.78 100 29.66 98 29.53 97 29.41 95 29.28 94 29.16 92 30 31.55 ioa 31.42 98 31.30 97 31.17 95 30.05 94 30.92 93 0.19 31 0.20 33.40 100 33.28 98 33.15 97 33.03 96 32.90 94 32.78 93 32 0.21 35.36 100 35.23 99 35.11 97 34.98 96 34.86 94 34.73 93 33 0.22 37.41 100 37.28 99 37.16 98 37.03 96 36.91 94 36.78 93 34 0.23 39.56 100 39.43 99 89.31 98 39.18 96 39.06 94 38.93 93 35 41.83 100 41.70 99 41.58 98 41.45 96 41.33 95 41.20 93 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.06 mm. B 18 PSYCHROMETRICAL TABLES. t — t , Difference of Wet and Dry -Bulb Thermometers. Wet- Bulb Mean Thermo- Vertical 1°.2 1°.4 1°.6 1°.8 2°.0 2°.2 meter, t' Differ- Centi- grade Degrees ence for eachOM. Force of Vapor. Relative Humid- ity. Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force ol Vapor. Rela- tive Hu- mid- ity. ity. ity. ity. ity. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.03 3.89 78 3.77 74 3.65 71 3.53 67 3.41 64 3.29 61 1 4.23 79 4.11 75 3.99 72 3.87 69 3.75 66 3.63 63^ 0.04 2 0.04 4.59 80 4.47 76 4.35 73 4.23 70 4.11 67 3.99 65* 3 0.04 4.97 80 4.85 77 4.73 74 4.61 71 4.49 69 4.37 66 4 0.04 5.38 81 5.26 78 5.14 75 5.02 73 4.90 70 4.78 67 5 5.82 82 5.70 79 5.58 77 5.46 74 5.34 71 5.22 69 0.05 6 0.05 6.28 83 6.16 80 6.04 77 5.92 75 5.80 72 5.68 70 7 0.05 6.77 83 6.65 81 6.53 78 6.41 76 6.29 73 6.17 71 8 0.06 7.29 84 7.17 81 7.05 79 6.93 76 6.81 74 6.69 72 9 0.06 7.85 84 7.73 82 7.61 80 7.49 77 7-37 75 7.25 73 10 8.44 85 8.32 83 8.20 80 8.08 78 7.96 76 7.84 74 0.06 11 0.07 9.07 86 8.95 83 8.82 81 8.70 79 8.58 77 8.46 75 12 0.07 9.73 86 9.61 84 9.49 82 9.37 80 9.25 78 9.12 76 13 0.08 10.43 86 10.31 84 10.19 82 10.07 80 9.95 78 9.83 76 14 0.08 11.18 87 11.06 85 10.94 83 10.81 81 10.69 79 10.57 77 15 11.97 87 11.85 85 11.73 83 11.60 81 11.48 80 11.36 78 0.08 16 0.09 12.80 88 12.68 86 12.56 84 12.44 82 12.32 80 12.19 78 17 0.09 13.69 88 13.57 86 13.44 84 13.32 83 13.20 81 13.08 79 18 0.10 14.62 88 14.50 87 14.38 85 14.26 83 14.13 81 14.01 80 19 0.11 15.61 89 15.49 87 15.37 85 15.24 83 15.12 82 15.00 80 20 16.65 89 16.53 87 16.41 86 16.29 84 16.16 82 16.04 81 0.11 21 0.12 17.76 89 17.63 88 17.51 86 17.39 84 17.27 83 17.14 81 22 0.12 18.92 90 18.80 88 18.67 86 18.55 85 18.43 83 18.30 82 23 0.13 20.15 90 20.02 88 19.90 87 19.78 85 19.65 83 19.53 82 24 0.14 21.44 90 21.32 88 2120 87 21.07 85 20.95 84 20.82 82 25 22.81 90 22.68 89 22.56 87 22.44 86 22.31 84 22.19 83 0.14 26 0.15 24.24 90 24.12 89 23.99 87 23.87 86 23.75 85 23.62 83 27 0.16 25.76 91 25.63 89 25.51 88 25.39 86 25.26 85 25.14 83 28 0.17 27.35 91 27.23 89 27.10 88 26.98 87 26.86 85 26.73 84 29 0.18 29.03 91 28.91 90 28.78 88 28.66 87 28.53 85 28.41 84 30 30.80 91 30.67 90 30.55 89 30.42 87 30.30 86 30.17 84 0.19 31 0.20 32.65 91 32.53 90 32.40 89 32.28 87 32.15 86 32.03 85 32 0.21 34.61 91 34.48 90 34.36 89 34.23 88 34.11 86 33.98 85 33 0.22 36.66 92 36.53 90 36.41 89 36.28 88 36.16 86 36.03 85 34 0.23 38.81 92 38.68 90 38.56 89 38.43 88 38.31 87 38.18 85 35 41.07 92 40.94 91 40.82 89 40.69 88 40.57 87 40.44 86 Mean Horizontal Difference of Force of Vapor for each OM = 0.06 mm. 19 PSYCHROMETRICAL TABLES. t — t', Difference of Wet and Dry-Bulb Thermometera. Wet- Bulb Mean Thermo Vertical 2°»4 2°.6 2°«8 3°.O 3°«2 3°.4 meter. Differ- Centi- grade Degrees ence for eachO°.l. Force of Vapor. Relative Humid- ity. Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- ity. ity. ity. ity. ity. 0 Millim. Millim. Millim. Millim. Millim. Millim. Millim. o 3.17 58 3.06 55 2.94 52 2.82 50 2.70 47 2.58 44 ! 0.03 3.51 60 3.39 57 3.27 54 3.16 52 3.04 49 2.92 47 2 0.04 3.87 62 3.75 59 3.63 56 3.51 54 3.39 51 3.28 49 3 0.04 4.25 63 4.13 61 4.02 58 3.90 56 3.78 53 3.66 51 4 0.04 4.66 65 4.54 62 4.42 60 4.30 57 4.18 55 4.06 53 5 0.04 5.10 66 4.98 64 4.86 61 4.74 59 4.62 57 4.50 55 0.05 g 5.56 67 5.44 65 5.32 63 5.20 61 5.08 58 4.96 56 7 0.05 6.05 69 5.93 66 5.81 64 5.69 62 5.57 60 5.45 58 g 0.05 6.57 70 645 68 6.33 65 6.21 63 6.09 61 5.97 59 9 0.06 7.13 71 7.01 69 6.89 67 6.77 65 6.64 63 6.52 61 10 0.06 7.72 72 7.59 70 7.47 68 7.35 66 7.23 64 7.11 62 0.06 11 8.34 73 8.22 71 8.10 69 7.98 67 7.86 65 7.74 63 12 0.07 9.00 74 8.88 72 8.76 70 8.64 68 8.52 66 8.40 64 13 0.07 9.71 75 9.58 73 9.46 71 9.34 69 9.22 67 9.10 66 14 0.07 10.45 75 10.33 73 10.21 72 10.08 70 9.96 68 9.84 67 15 0.08 11.24 76 11.12 74 10.99 72 10.87 71 10.75 69 10.63 67 0.08 16 r\ f\n 12.07 77 11.95 75 11.83 73 11.71 72 11.58 70 11.46 68 17 u.uy 12.95 77 12.83 76 12.71 74 12.59 72 12.47 71 12.34 69 18 0.09 13.89 78 13.77 76 13.64 75 13.52 73 13.40 72 13.28 70 19 0.10 14.87 78 14.75 77 14.63 75 14.51 74 14.38 72 14.26 71 20 0.10 15.92 79 15.79 77 15.67 76 15.55 74 15.43 73 15.30 72 0.11 21 17.02 80 16.90 78 16.77 77 16.65 75 16.53 74 16.40 72 22 0.12 18.18 80 18.06 79 17.93 77 17.81 76 17.69 74 17.56 73 23 0.12 19.41 80 19.28 79 19.16 78 19.04 76 18.91 75 18.79 73 24 0.13 20.70 81 20.58 79 20.45 78 20.33 77 20.21 75 20.08 74 0.14 25 22.06 81 21.94 80 21.82 79 21.69 77 21.57 76 21.45 75 0.14 26 0.15 23.50 82 23.37 80 23.25 79 23.13 78 23.00 77 22.88 75 27 25.01 82 24.89 81 24.76 79 24.64 78 24.51 77 24.39 76 28 0.16 0.17 26.61 83 26.48 81 26.36 80 26.23 79 26.11 77 25.98 76 29 0.18 28.28 83 28.16 81 28.03 80 27.91 79 27.69 77 27.76 76 SO 30.05 83 29.92 82 29.80 81 29.67 79 29.55 78 29.42 77 0.19 31 0.20 31.90 83 31.78 82 31.65 81 31.53 80 31.40 78 31.28 77 32 0.21 33.86 84 33.73 82 33.61 81 33.48 80 33.36 79 33.23 78 33 0.22 35.90 84 35.77 83 35.65 81 35.52 80 35.40 79 35.27 78 34 0.23 38.06 84 37.93 83 37.81 82 37.68 81 37.56 80 37.43 78 35 40.31 84 40.18 83 40.06 82 39.93 81 39.81 80 39.68 79 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.06 mm. B PSYCHROMETRICAL TABLES. t — t', Difference of Wet and Dry-Bulb Thermometers. Wet- Bulb Mean Thermo- Vertical 3°.6 3°.8 4°.0 4°.2 4°.4 4°.6 meter, t' Differ- Centi- grade Degrees. ence for each 0°.l. Force of Vapor. Relative Humid- ity. Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- ity. ity. ity. ity. ity. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 2.46 41 2.34 39 2.22 36 2.11 34 1.99 32 1.87 29 0-03 1 2.80 44 2.68 42 2.56 39 2.44 37 2.32 35 2.20 32 2 0.04 n f\4 3.16 46 3.04 44 2.92 42 2.80 39 2.68 37 2.56 35 3 U.U4 0.04 3.54 49 3.42 46 3.30 44 3.18 42 3.06 40 2.94 38 4 0.04 3.94 51 3.82 48 3.71 46 3.59 44 3.47 42 3.35 40 5 4.38 52 4.26 50 4.14 48 4.02 46 3.90 44 3.78 42 0.05 6 4.84 54 4.72 52 4,60 50 4.48 48 '4.36 46 4.24 44 7 0.05 5.33 56 5.21 54 5.09 52 4.97 50 4.85 48 4.73 46 0.05 8 n n£ 5.85 57 5.73 56 5.61 54 5.49 52 5.37 50 5.25 48 9 U.Uo 6.40 59 6.28 57 6.16 55 6.04 53 5.92 52 5.80 50 0.06 10 6.99 60 6.87 58 6.75 57 6.63 55 6.51 53 6.39 52 0.06 11 7.61 61 7.49 60 7.37 58 7.25 56 7-13 55 7.01 53 0.07 12 8.28 62 8.15 61 8.03 59 7.91 58 7.79 56 7.67 55 13 0.07 8.98 64 8.85 63 8.73 61 8.61 59 8.49 57 8.37 56 ' 0.07 14 9.72 65 9.60 63 9.48 62 9.35 60 9.23 59 9.11 57 0.08 15 10.51 66 10.38 64 10.26 63 10.14 61 10.02 60 9.90 58 0.08 16 0.09 11.34 67 11.22 65 11.10 64 10.97 62 10-85 61 10.73 59 17 12.22 68 12.10 67 11.98 65 11.85 63 11-73 62 11.61 61 0.09 18 0.-10 13.15 69 13.03 67 12.91 66 12.79 64 12-66 63 12.54 62 19 0.11 14.14 69 14.02 68 13.89 66 13.77 65 13-65 64 13.53 62 20 15.18 70 15.06 69 14.94 67 14.81 66 14-69 65 14.57 63 0.11 21 16.28 71 16.16 69 16.04 68 15.91 67 15-79 65 15.67 64 22 0.12 0.12 17.44 71 17.32 70 17.20 69 17.07 67 16-95 66 16.83 65 23 0.13 18.67 72 18.54 71 18.42 69 18.30 68 18.17 67 18.05 66 24 0.14 19.96 73 19.84 71 19.71 70 19.59 69 19-46 68 19.34 66 25 21.32 73 21.20 72 21.07 71 20.95 70 20-83 68 20.70 67 0.14 26 0.15 22.75 74 22.63 73 22.50 71 22.38 70 22.26 69 22.13 68 27 0.16 24.27 74 24.14 73 24.02 72 23.89 71 23.77 70 23.64 68 28 0.17 25.86 75 25-73 74 25.61 72 25.48 71 25.36 70 25.24 69 29 0.18 27.44 75 27.31 74 27.29 73 27.16 72 27.04 71 26.91 70 30 29.30 76 29.17 75 29.05 73 28.92 72 28.80 71 28.67 70 0.19 31 0.20 31.15 76 31.03 75 30.90 74 30.78 73 30.65 72 30.53 71 32 0.21 33.10 77 32.97 76 32.85 75 32.72 73 32.60 72 32.47 71 33 0.22 35.15 77 35.02 76 34.90 75 34.77 74 34.65 73 34.52 72 34 0.23 37.30 77 37.17 76 37.05 75 36.92 74 36.80 73 36.67 72 35 39.56 78 39.43 77 39.31 76 39.18 74 39.06 73 38.93 72 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.06 mm. PSYCHROMETRICAL TABLES. t — t', Difference of Wet and Dry -Bulb Thermometers. Wet- Bulb Mean Thermo Vertical 4°.8 5°.0 5°.2 5°.4 5°.6 5°.8 meter, t' Differ- P»nti ence for oenti- grade Degrees. eachOM. Force of Vapor. Relative Humid ity. Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- ity. ity. ity. ity. ity. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 1.75 27 1.63 25 1.51 23 1.39 21 1.27 19 1.15 17 0.03 1 2.08 30 1.97 28 1.85 26 1.73 24 1.61 22 1.49 20 2 0.04 2.44 33 2.32 31 2.20 29 2.08 27 1.96 25 1.85 23 3 0.04 2.82 36 2.70 34 2.58 32 2.46 30 2.34 28 2.22 26 4 0.04 3.23 38 3.11 36 2.99 34 2.87 33 2.75 31 2.63 29 0.04 5 3.66 40 3.54 39 3.42 37 3.30 35 3.18 33 3.06 32 0.05 6 4.12 43 4.00 41 3.88 39 3.76 37 3.64 36 3.52 34 7 0.05 4.61 45 4.49 43 4.37 41 4.25 40 4.13 38 4.01 36 0.05 8 5.13 47 5.01 45 4.89 43 4.77 42 4.65 40 4.53 39 9 0.06 5.68 48 5.56 47 5.44 45 5.32 44 5.20 42 5.08 41 0.06 10 6.27 50 6.15 48 6.02 47 5.90 45 5.78 44 5.66 42 0.06 11 f\ /Y7 6.89 52 6.77 50 6.65 49 6.53 47 6.40 46 6.28 44 . 12 IMJ7 7.55 53 7.43 52 7.31 50 7.18 49 7.06 47 6.94 46 0.07 13 0.07 8.25 55 8.13 53 8.01 52 7.88 50 7.76 49 7.64 47 14 8.99 56 8.87 54 8.75 53 8.62 51 8.50 50 8.38 49 0.08 15 9.78 57 9.65 55 9.53 54 9.41 53 9.29 51 9.17 50 0.08 16 0.09 10.61 58 10.49 57 10.36 55 10.24 54 10.12 53 10.00 51 17 11.49 59 11.37 58 11.24 56 11.12 55 11.00 54 10.88 53 0.09 18 0.10 12.42 60 12.30 59 12.17 58 12.05 56 11.93 55 11.81 54 19 13.40 61 18.28 60 13.16 59 13.04 57 12.91 56 12.79 55 0.11 20 14.44 62 14.32 61 14.20 60 14.08 58 13.95 57 13.83 56 0.11 21 15.54 63 15.42 62 15.30 60 15.17 59 15.05 58 14.93 57 0.12 22 0.12 16.70 64 16.58 63 16.46 61 16.33 60 16.21 59 16.09 58 23 0.13 17.93 65 17.80 63 17.68 62 17.56 61 17.43 60 17.31 59 24 19.22 65 19.09 64 18.97 63 18.85 62 18.72 61 18.60 60 0.14 25 20.58 66 20.46 65 20.33 64 20.21 63 20.08 62 19.96 60 0.14 26 0.15 22.01 67 21.88 65 21.76 64 21.63 63 21.51 62 21.39 61 27 0.16 23.52 67 23.40 66 23.27 65 23.15 64 23.02 63 22.90 62 28 0.17 25.11 68 24.99 67 24.86 66 24.74 65 24.61 64 24.49 63 29 26.79 68 26.66 67 26.54 66 26.41 65 26.29 64 26.16 63 O.lS 30 28.55 69 28.42 68 28.30 67 28.17 66 28.05 65 27.92 64 0.19 31 0.20 30.40 70 30.28 69 30.15 68 30.03 67 29.90 66 29.78 65 32 0.21 32.35 70 32.22 69 32.10 68 31.97 67 31.85 66 31.72 65 33 0.22 34.40 71 34.27 70 34.15 69 34.02 68 33.90 67 33.77 66 34 0.23 36.55 71 36.42 70 36.30 69 36.17 68 36.05 67 35.92 66 35 38.80 71 38.68 70 Mean Horizontal Difference of Force of Vapor for each O'.l = 0.06 mm. B 22 PSYCHROMETRICAL TABLES. t — t', Difference of Wet and Dry -Bulb Thermometers. Wet- Bulb Mean Thermo Vertical 6°.O 6°.2 6°.4 6.6 6°.8 7°«O meter. Differ- t' Centi- ence for grade eachOM. Rela- Rela- Rela Rela Rela- Degrees. Force of Vapor. Relative Humid- ity. Force ol Vapor. tive Hu- mid- Force of Vapor. tive Hu- mid- Force of Vapor. live Hu- mid- Force of Vapor. live Hu- mid- Force o Vapor. tive Hu- mid- ity. ity. ity. ity. ity. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 1.04 15 0.92 13 0.80 11 0.68 9 0.56 8 0.44 6 0.03 1 0.04 1.37 18 1.25 16 1.13 15 1.01 13 0.89 11 0.78 10 2 0.04 1.73 22 1.61 20 1.49 18 1.37 16 1.25 15 1.13 13 3 0.04 2.11 25 1.99 23 1.87 21 1.75 19 1.63 18 1.51 16 4 0.04 2.51 28 2.39 26 2.27 24 2.15 23 2.03 21 1.91 19 5 2.94 30 2.82 28 2.70 27 2.58 25 2.46 24 2.34 22 0.05 6 3.40 33 3.28 31 3.16 29 3.04 28 2.92 26 2.80 25 0.05 7 0.05 3.89 35 3.77 33 3.65 32 3.53 30 3.41 29 3.29 28 8 0.06 4.41 37 4.28 35 4.16 34 4.04 33 3.92 31 3.80 30 9 0.06 4.96 39 4.84 38 4.71 36 4.59 35 4-47 33 4.35 32 10 5.54 41 5.42 40 5.30 38 5.18 37 5.06 35 4.94 34 0.06 11 0.07 6.16 43 6.04 41 5.92 40 5.80 39 5.68 37 5.56 36 12 0.07 6.82 44 6.70 43 6.58 42 6.46 41 6.34 39 6.22 38 13 0.07 7.52 46 7.40 45 7.28 43 7.16 42 7.03 41 6.91 40 14 0.08 8.26 47 8.14 46 8.02 45 7.90 44 7.77 43 7.65 41 15 9.05 49 8.92 48 8.80 46 8.68 45 8.56 44 8.44 43 0.08 16 0.09 9.88 50 9.75 49 9.63 48 9.51 47 9.39 45 9.27 44 17 0.09 10.76 52 10.63 50 10.51 49 10.39 48 10.27 47 10.14 46 18 0.10 11.69 53 11.56 51 11.44 50 11.32 49 11.20 48 11.07 47 19 0.11 12.67 54 12.55 53 12.42 51 12.30 50 12.18 49 12.06 48 20 13.71 55 13.58 54 13.46 53 13.34 52 13.22 50 13.09 49 0.11 21 0.12 14.81 56 14.68 55 14.56 54 14.44 53 14.31 52 14.19 51 22 0.12 15.96 57 15.84 56 15.72 55 15.59 54 15.47 53 15.35 52 23 0.13 17.19 58 17.06 57 16.94 56 16.82 55 16.69 54 16.57 53 24 0.14 18.48 59 18.35 58 18.23 56 18.11 55 17.98 54 17.86 53 25 19.84 59 19.71 58 19.59 57 19.46 56 19.34 55 19.22 54 0.14 26 0.15 21.26 60 21.14 59 21.01 58 20.89 57 20.77 56 20.64 55 27 0.16 22.77 61 22.65 60 22.52 59 22.40 58 22.28 57 22.15 56 28 0.17 24.36 62 24.24 61 24.11 60 23.99 59 23.86 58 23.74 57 29 0.18 26.04 62 25.91 61 25.79 60 25.66 59 25.54 58 25.41 57 30 27.80 63 27.67 62 27.55 61 27.42 60 27.30 59 27.17 58 0.19 31 0.20 29.65 64 29.53 63 29.40 62 29.28 61 29.15 60 29.03 59 32 0.21 31.59 64 31.47 63 31.34 62 31.22 61 31.09 60 30.97 59 33 33.64 65 33.51 64 33.39 63 33.26 62 33.14 61 33.01 60 34 35 Mean Horizontal Difference of Force of Vapor for each OM = 0.06 mm. B 23 10 PSYCHROMETRICAL TABLES. t — t', Difference of Wet and Dry-Bulb Thermometers. Wet- Bulb Mean Thermo Vertical 7°.2 y°.4 •y°.6 7°.§ 8°.0 8°.2 meter, f Differ- Centi- grade Degrees ence for eachO°.l Force o Vapor. Relativ Humid ity. Force o Vapor. Rela live Hu- mid- Force o Vapor. Rela tive Hu- mid Force o Vapor. Rela tive Hu- mid Force o Vapor Rela tive Hu- mid Force o Vapor Rela- tive Hu- mid ity. ity. ity. ity. ity. o Millim. Millim Millim Millim Millim Millim Millim 0 0.32 4 0.20 3 0.09 1 1 0.03 0.66 8 0.54 7 0.42 5 0.30 4 0.18 2 0.06 1 2 0.04 1.01 12 0.89 10 0.77 9 0.65 7 0.53 6 0.41 4 3 0.04 1.39 15 1.27 13 1.15 12 1.03 11 0.91 9 0.79 8 4 0.04 1.79 18 1.67 16 1.55 15 1.43 14 1.31 13 1.19 11 5 0.04 2.22 21 2.10 19 1.98 18 1.86 17 1.74 16 1.62 14 0.05 6 2.78 24 2.66 23 2.44 21 2.32 20 2.20 18 2.08 17 7 0.05 3.16 26 3.04 25 2.92 24 2.80 22 2.68 21 2.56 20 8 0.05 3.68 29 3.56 27 3.44 26 3.32 25 3.20 24 3.08 22 9 0.06 4.23 31 4.11 30 3.99 28 3.87 27 3.75 26 3.63 25 10 0.06 4.82 33 4.70 32 4.57 30 4.45 29 4.33 28 4.21 27 0.06 11 5.44 35 5.32 34 5.19 32 5.07 31 4.95 30 4.83 29 12 0.07 6.09 37 5.97 36 5.85 34 5.73 33 5.61 32 5.49 31 13 0.07 6.79 39 6.67 37 6.55 36 6.43 35 6.31 34 6.18 33 14 0.07 7.53 40 7.41 39 7.29 38 7.17 37 7.04 36 6.92 35 15 0.08 8.31 42 8.19 41 8.07 40 7.95 39 7.83 37 7.71 36 0.08 16 9.14 43 9.02 42 8.90 41 8.78 40 8.66 39 8.53 38 17 0.09 10.02 45 9.90 44 9.78 43 9.66 42 9.53 40 9.41 39 18 0.09 10.95 46 10.83 45 10.71 44 10.58 43 10.46 42 10.34 41 19 0.10 11.93 47 11.81 46 11.69 45 11.56 44 11.44 43 11.32 42 20 0.10 12.97 48 12.85 47 12.72 46 12.60 45 12.48 44 12.36 43 0.11 21 14.07 50 13.94 49 13.82 48 13.70 47 13.58 46 13.45 45 22 0.12 15.22 51 1510 50 14.98 49 14.85 48 14.73 47 14.61 46 23 0.12 16.45 52 16.32 51 16.20 50 16.08 49 15.95 48 15.83 47 24 0.13 17.73 52 17.61 52 17.49 51 17.36 50 17.24 49 17.12 48 25 0.14 19.09 53 18.97 52 18.85 52 18.72 51 18.60 50 18.47 49 0.14 26 20.52 54 20.39 53 20.27 52 20.14 51 20.02 51 19.90 50 27 0.15 0.16 22.03 55 21.90 54 21.78 53 21.65 52 21.53 51 21.41 51 28 0.17 23.61 55 23.49 54 23.36 53 23.24 53 23.11 52 22.99 51 29 0.18 25.29 56 25.16, 55 25.04 54 24.91 54 24.79 53 24.66 52 30 27.05 57 26.92 56 26.80 55 26.67 55 26.55 54 26.42 53 0.19 31 0.20 28-90 58 28.78 57 28.65 56 28.53 55 28.40 55 28.27 54 32 30.85 59 30.72 58 30.60 57 30.47 56 30.35 56 33 34 35 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.06 mm. PSYCHROMETRICAL TABLES. t — t', Difference of Wet and Dry-Bulb Thermometers. Wet- Bulb Mean Thermo Vertical 8°.4 8°.6 8°.8 9°.0 9°.2 9°.4 meter, t' Differ- Centi- grade Degrees ence for each 0°.l. Force of Vapor. Relative Humid- ity. Force o1 Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force 01 Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force o Vapor. Rela- live Hu- mid- ity. ity. ity. ity. ity. o Millim. Millim. Millim. Millim. Millim. Millim. Millim 0 1 2 0.04 0.30 3 0-1£ 2 0.06 1 3 0.04 0.67 7 0.55 5 0.43 4 0.31 3 0.19 2 0.08 1 4 0.04 1.07 10 0.95 9 0.83 8 0.72 6 0.60 5 0.48 4 5 1.50 13 1.38 12 1.26 11 1.14 10 1.02 8 0.90 7 0.05 6 0.05 1.96 16 1.84 15 1.72 14 1.60 13 1.48 12 1.36 10 7 0.05 2.44 19 2.32 17 2.20 16 2.08 15 1.96 14 1.84 13 8 0.06 2.96 21 2.84 20 2.72 19 2.60 18 2.48 17 2.36 16 9 0.06 3.51 24 3.39 23 3.27 21 3.15 20 3.03 19 2.91 18 10 4.09 26 3.97 25 3.85 24 3.73 23 3.61 22 3.49 21 0.06 11 0.07 4.71 28 4.59 27 4.47 26 4.35 25 4.23 24 4.11 23 12 0.07 5.37 30 5.25 29 5.12 28 5.00 27 4.88 26 4.76 25 13 0.07 6.06 32 5.94 31 5.82 30 5.70 29 5.58- 28 5.46 27 14 0.08 6.80 34 6.68 33 6.56 32 6.44 31 6.31 30 6.19 29 15 7.58 35 7.46 34 7.34 33 7.22 33 7.10 32 6.97 31 0.08 16 0.09 8.41 37 8.29 36 8.17 35 8.05 34 7.92 33 7.80 32 17 0.09 9.29 39 9.17 38 9.04 37 8.92 36 8.80 35 8.68 34 18 0.10 10.22 40 10.09 39 9.97 38 9.85 37 9.73 36 9.60 35 19 0.11 11.20 41 11.07 40 10.95 39 10.83 39 10.71 38 10.58 37 20 12.23 43 12.11 42 11.99 41 11.87 40 11.74 39 11.62 38 o.n 21 0.12 13.33 44 13.21 43 13.08 42 12.96 41 12.84 40 12.71 40 22 0.12 14.48 45 14.36 44 14.24 43 14.12 42 13.99 41 13.87 41 23 0.13 15.71 46 15.58 45 15.46 44 15.34 43 15.21 42 15.09 42 24 0.14 16.99 47 16.87 46 16.75 45 16.62 44 16.50 44 16.37 43 25 18.35 48 18.22 47 18.10 46 17.98 45 17.86 45 17.73 44 0.14 26 0.15 19.77 49 19.65 48 19.52 47 19.40 46 19.27 46 19.15 45 27 0.16 21.28 50 21.16 49 21.03 48 20.91 47 20.78 47 20.66 46 28 0.17 22.86 51 22.74 50 22.61 49 22.49 48 22.36 47 22.24 47 29 0.18 24.54 51 24.41 51 24.29 50 24.16 49 24.04 48 23.91 47 30 26.30 52 26.17 51 26.05 51 25.92 50 25.80 49 25.67 48 0.19 31 28.16 53 28.03 52 27.91 51 27.78 51 32 33 34 35 Mean Horizontal Difference of Force of Vapor for eachOM = 0 06 mm. B 25 12 PSYCHROMETRICAL TABLES. t — t', Difference of Wet and Dry-Bulb Thermometera. Wet- Bulb Mean Thermo Vertical 9°.6 9°.8 10°.0 1O°.2 1O°.4 10 .6 meter, t' Differ- Centi- grade | Degrees ence for each 0° 1 Force of Vapor. Relative Humid- ity. Force of Vapor. Rela- tive Hu- mid- Force o Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive HU- mid- Force ol Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- ity. ity. ity. ity. ity. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 1 2 3 " 4 0.36 3 0.24 2 0.12 1 5 0.04 0.78 6 0.66 5 0.54 4 0.42 3 0.30 2 0.18 1 0.05 6 1.24 9 1.12 8 1.00 7 0.88 6 0.76 5 0.64 5 7 0.05 1.72 12 160 11 1.48 10 1.36 9 1.24 8 1.12 7 8 0.05 2.24 15 2.12 14 2.00 13 1.88 12 1.76 11 1.64 10 9 0.06 2.79 17 2.66 16 2.54 16 2.42 15 2.30 14 2.18 13 10 0.06 3.37 20 3.25 19 3.13 18 3.00 17 2.88 16 2.76 15 0.06 11 3.98 22 3.86 21 3.74 20 3.62 19 3 50 18 3.38 18 12 0.07 4.64 24 4.52 23 4.40 22 4.28 22 4.15 21 4.03 20 13 0.07 5.33 26 5.21 25 5.09 25 4.97 24 4.85 23 4.73 22 14 0.07 6.07 28 5.95 27 5.83 26 5.71 25 5.58 25 5.46 24 15 0.08 6.85 30 6.73 29 6.61 28 6.49 27 6.37 26 6.24 26 0.08 16 7-68 31 7.56 31 7.44 30 7.31 29 7.19 28 7.07 27 17 0.09 A An 8.56 33 8.43 32 8.31 31 8.19 31 8.07 30 7.94 29 13 u.uy 9.48 35 9.36 34 9.24 33 9.11 32 8.99 31 8.87 30 19 0.10 10.46 36 10.34 35 10.22 34 10.09 33 9.97 33 9.85 32 20 0.11 11.50 37 11.37 36 11.25 36 11.13 35 11.01 34 10.88 33 O.ll 21 12.59 39 12.47 38 12.35 37 12.22 36 12.10 35 11.98 35 22 0.12 13.75 40 13.62 39 13.50 38 13.38 37 13.25 37 13.13 36 23 0.12 14.96 41 14.84 40 14.72 39 14.59 39 14.47 38 14.35 37 24 0.13 16.25 42 16.13 41 16.00 40 15.88 40 15.76 39 15.63 38 0.14 25 17.61 43 17.48 42 17.36 42 17.24 41 17.12 40 16.99 39 0.14 26 0.15 19.02 44 18.90 43 18.78 42 18.65 42 18.53 41 18.40 40 27 0.16 20.54 45 20.41 44 20.29 43 20.16 43 20.04 42 19.91 41 23 0.17 22.12 46 22.00 45 21.87 44 21.75 44 21.62 43 21.50 42 29 0.18 23.79 47 23.66 46 23.54 45 23.41 45 23.29 44 23.16 43 30 25.55 48 25.42 47 25.30 46 31 32 oo OO 34 35 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.06 mm. B 26 PSYCHROMETRICAL TABLES. 13 Wet- t — t', Difference of Wet and Dry -Bulb Thermometers. Bulb Thermo- Mean Vertical 10°.8 11°.0 11°.2 ll°.4 11°.6 ll°.8 meter. \f Differ- Centi- grade Degrees. ence for eachOM. Force of Vapor. Relative Humid- ity. ?orce of Vapor. Rela- tive Hu- mid- Torce of Vapor. Rela- tive Hu- mid Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- ity. ity. ity. ity. ity. 0 Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 1 3 4 5 6 0.52 4 0.40 3 0.28 2 0.16 1 7 0.05 n nx 1.00 7 0.88 6 0.76 5 0.64 4 0.52 3 0.40 2 8 U.UO 0.06 1.52 9 1.40 9 1.27 8 1.15 7 1.03 6 0.91 5 9 ft C& 2.06 12 1.94 11 1.82 10 1.70 10 1.58 9 1.46 8 10 U.Uo 2.64 14 2.52 14 2.40 13 2.28 12 2.16 11 2.04 11 0.06 11 n m 3.26 17 3.14 16 3.02 15 2.90 14 2.77 14 2.65 13 12 0.0 1 3.91 19 3.79 18 3.67 17 3.55 17 3.43 16 3.31 15 13 0.07 n f\n 4.61 21 4.49 20 4.36 19 4.24 19 4.12 18 4.00 17 14 0.0 1 0.08 5.34 23 5.22 22 5.10 21 4.98 21 4.86 20 4.73 19 15 6.12 25 6.00 24 5.88 23 5.76 22 5.63 22 5.51 21 0.08 16 0.09 6.95 27 6.83 26 6.70 25 6.58 24 6.46 23 6.34 22 17 0.09 7.82 28 7.70 27 7.58 27 7.46 26 7.33 25 7.21 24 18 0.10 8.75 29 8.63 29 8.50 28 8.38 27 8.26 27 8.14 26 19 0.10 9.73 31 9.60 30 9.48 30 9.36 29 9.24 28 9.11 28 20 10.76 33 10.64 32 10.51 31 10.39 30 10-27 30 10.15 29 0.11 21 0.12 11.85 34 11.73 33 11.61 32 11.48 32 11.36 31 11.24 30 22 0.12 13.01 35 12.88 34 12.76 34 12.64 33 12.51 32 12.39 32 23 0.13 14.22 36 14.10 36 13.98 35 13.85 34 13.73 34 13.61 33 24 0.14 15.51 38 15.39 37 15.27 36 15.15 35 15.02 35 14.90 34 25 16.87 39 16.74 38 16.62 37 16.49 36 16.37 36 16.24 35 0.14 26 0.15 18.28 39 18.16 39 18.03 38 17.91 37 17.78 37 17.66 36 27 0.16 19.79 40 19.67 40 19.54 39 19.42 38 19.29 38 19.17 37 28 0.17 21.37 41 21.25 41 21.12 40 21.00 39 20.87 39 20.75 38 29 23.04 42 22.91 42 30 31 32 33 34 35 Mean Horizontal Difference of Force of Vapor for each OM = 0.06 mm. 27 14 PSYCHROMETRICAL TABLES. t — t', Difference of Wet and Dry-Bulb Thermometers. Wet- Bulb Mean Thermo Vertical 12°.0 12°.2 12D.4 12°.6 12°.8 13°.O meter, t' Differ- Genii- grade Degrees ence for each 0°.l Force of Vapor. Relative Humid- ity. Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- Force of Vapor. Rela- tive Hu- mid- ity. ity. ity. ity. ity. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. 12 3.19 14 3.06 14 2.94 13 2.82 12 2.70 12 2.58 11 0.07 13 0.07 3.88 16 3.76 16 3.64 15 3.51 14 3.39 14 3.27 13 14 4.61 18 4.49 18 4.37 17 4.25 16 4.13 16 4.00 15 0.08 15 0.08 5.39 20 5.27 20 5.15 19 5.03 18 4.90 18 4.78 17 16 6.22 22 6.09 21 5.97 21 5.85 20 5.73 19 5.61 19 0.09 17 0.09 7.09 24 6.97 23 6.84 22 6.72 22 6.60 21 6.48 21 18 0.10 8.01 25 7.89 25 7.77 24 7.65 23 7.52 23 7.40 22 19 0.10 8.99 27 8.87 26 8.74 26 8.62 25 8.50 25 8.38 24 20 All 10.02 28 10.90 28 9.78 27 9.65 26 9.53 26 9.41 25 21 (JflJ 11.12 30 10.99 29 10.87 28 10.75 28 10.62 27 10.50 27 0.12 22 0.12 12.27 31 12.14 30 12.02 30 11.90 29 11.77 28 11.65 28 23 0.13 13.48 32 13.36 31 13.23 31 13.11 30 12.99 29 12.86 29 24 0.14 14.78 33 14.65 33 14.53 32 14.40 31 14.28 31 14.16 30 25 0.14 16.11 35 15.99 34 15.87 33 15.74 33 15.62 32 15.50 31 26 17.54 36 17.42 35 17.29 34 17.17 34 17.04 33 16.92 33 0.15 27 0.16 19.04 37 18.92 36 18,80 35 18.67 35 18.55 34 18.42 34 28 2063 38 13.°2 13°.4 13°.6 13°.§ 14°.0 Millim. Millim. Millim. Millim. Millim. Millim. 12 0.07 2.46 10 2.34 10 2.22 9 2.09 8 1.97 8 13 0.07 3.15 12 3.03 12 2.91 11 2.79 11 2.66 10 14 0.08 3.88 14 3.76 14 3.64 13 3.52 13 3.40 12 15 0.08 4.66 16 4.54 16 4.42 15 4.29 15 4.17 14 16 5.48 18 5.36 18 5.24 17 5.12 16 5.00 16 0.09 17 0.09 6.36 20 6.23 19 6.11 19 5.99 18 5.87 17 18 0.10 7.28 22 7.16 21 7.03 20 6.91 20 6.79 19 19 0.10 8.25 23 8.13 22 8.01 22 7.89 21 7.76 21 20 0.11 9.29 25 9.16 24 9.04 23 8.92 23 8.80 22 21 10.38 26 10.25 25 10.13 25 10.01 24 9.89 24 0.12 22 0.12 11.53 27 11.40 27 11.28 26 11.16 26 11.03 25 23 0.13 12.74 28 12.62 28 12.49 27 12.37 27 12.25 26 24 0.14 14.02 30 13.90 29 13.77 29 13.65 28 13.53 27 25 0.14 15.37 31 15.25 30 15.12 30 15.00 29 14.88 29 26 16.80 32 16.67 31 16.55 31 16.42 30 16.30 30 Mean Horizontal Difference of Force of Vapor for eachOM = 0 .06 mm. B PSYCHROMETRICAL TABLES. Correction for the Barometrical Height. 15 For the Difference of Thermometers t — t'. Barometrical Height below. 1° 2° 3° 4° 5° 6° 7° 8° 9<> 10° 11° 12° 13° 14° Add. ubtr'ct. Wet-Bulb above the Freezing Point. Millim. Millim. Milli. Milli. Milli. Milli. Milli. Milli. Milli. Milli. Milli. Milli. Milli. Milli. Milli. Milli. 755 755 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 750 760 0.00 0.01 0.01 0.02 0.02 0.02 0.03 0.03 0.04 0.04 0.04 0.05 0.05 0.06 745 765 0.01 0.02 0.02 0.03 0.04 0.05 0.06 0.06 0.07 0.08 0.09 0.10 0.10 0.11 740 770 0.01 0.02 0.04 0.05 0.06 0.07 0.08 0.10 0.11 0.12 0.13 0.14 0.16 0.17 735 775 0.02 0.03 0.05 0.06 0.08 0.10 0.11 0.13 0.14 0.16 0.18 0.19 0.21 0.22 730 780 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 0.22 0.24 0.26 0.28 725 785 0.02 0.05 0.07 0.10 0.12 0.14 0.17 0.19 0.22 0.24 0.26 0.29 0.31 0.34 720 790 0.03 0.06 0.08 0.11 0.14 0.17 0.20 0.22 0.25 0.28 0.31 0.34 0.36 0.39 715 795 0.03 0.06 0.10 0.13 0.16 0.19 0.22 0.26 0.29 0.32 0.35 0.38 0.42 0.45 710 800 0-04 0.07 0.11 0.14 0.18 0.22 0.25 0.29 0.32 0.36 0.40 0.43 0.47 0.50 700 u 0.04 0.09 0.13 0.18 0.22 0.26 0.31 0.35 0.40 0.44 0.48 0.53 0.57 0.62 690 n 0.05 0.10 0.16 0.21 0.26 0.31 0.36 0.42 0.47 0.52 0.57 0.62 0.68 0.73 680 a 0.06 0.12 0.18 0.24 0.30 0.36 0.42 0.48 0.54 0.60 0.66 0.72 0.78 0.84 670 a 0.07 0.14 0.20 0.27 0.34 0.41 0.48 0.54 0.61 0.68 0.75 0.82 0.88 0.95 660 cc 0.08 0.15 0.23 0.30 0.38 0.46 0.53 0.61 0.68 0.76 0.84 0.91 0.99 1.06 650 M 0.08 0.17 0.25 0.34 0.42 0.50 0.59 0.67 0.76 0.84 0.92 1.01 1.09 1.18 Wet-bulb below the Freezing Point. EXAMPLE OF CALCULATION. 755 750 755 760 0.00 0.00 0.00 0.01 0.00 0.01 0.00 0.01 0.00 0.02 Wet-bulb above the Freezing Point. 745 765 0.01 0.01 0.02 0.03 0.04 t' = 17°.0. t — t' = 8°.2. h = 7lOmm- 740 770 0.01 0.02 0.03 0.04 0.05 The tables give for mean barometrical mm. 735 775 0.01 0.03 0.04 0.06 0.07 height 755mm- Force of vapor . . = 9.41 Additive correction for 7lOmm- and 8°.2 = 0.30 730 725 780 785 0.02 0.02 0.04 0.04 0.05 0.06 0.07 0.08 0.09 0.11 Force of vapor . . = 9.71 720 790 0.02 0.05 0.07 0.10 0.12 715 795 0.03 0.06 0.08 0.11 0.14 The mean barometrical pressure, at a given 710 800 0.03 0.06 0.09 0.13 0.16 place, being known, it is easy to make the above Psychrometrical Tables fitted for that place, by 700 u 0.04 0.08 0.12 0.15 0.19 determining, by means of this last table, a constant 690 u 0.05 0.09 0.14 0.18 0.23 correction, to be applied to the numbers in the ta- 680 u 0.05 0.11 0.16 0.21 0.26 bles, giving the force of vapor. This correction 670 M 0.06 0.12 0.18 0.24 0.30 will be found by taking for t — tf, or the difference 660 it 0.07 0.13 0.20 0.27 0.33 of thermometers, a mean value, the deviations of which will have little influence upon the accuracy 650 it 0.07 0.15 0.22 0.29 0.36 of the results. B 29 III. TABLE GIVING AT SIGHT THE RELATIVE HUMIDITY DEDUCED FROM THE INDICA- TIONS OF THE DEW POINT INSTRUMENTS. BY M. T. HAEGHENS. THIS table, which has been published in the Annuaire Meteor ologique de France for 1850, page 86, and following, has been calculated by Mr. Haeghens, using Regnault's Tables of Elastic Forces of Vapor. It gives directly the relative humidity, when the hygrometrical observations have been made by means of dew point instru- ments like those of Daniell, Regnault, Bache, and others. These hygrometers are destined to find out the temperature of the dew point, that is the temperature to which it would be necessary to lower the temperature of the air, in order that this air be completely saturated by the aqueous vapor which it con- tained at the time of the observation. The force of vapor contained in the air, or its absolute humidity, is thus the maxi- mum of force of vapor which corresponds to the temperature of the dew point ; it is given directly in the Table I. of the Elastic Forces of Vapor, by Regnault. The ratio of that maximum of force of vapor at the temperature of the dew point to the force of vapor which corresponds, in the same table, to the temperature of the surrounding air at the time of the observation, is the relative humidity. This ratio is given in hundredths in the following table, which relieves the observer of the trouble of calculating it. Let t = temperature of the air surrounding the instrument. tf = temperature of the dew point. t — t1 = the difference between these two temperatures. The first column, on the left, contains the temperature of the air t, in centigrade degrees. The following ones, headed with the differences, t — tf, between the temperatures of the air and of the dew point, give the relative humidity correspond- ing to the two elements. Temp, of the Air = t. Dew point = t1. Difference t — tf. Relative Humidity. Example: 10°.0 4°.4 5°.6 68 Should the temperature of the air t', or the difference t — t', fall between the numbers found in the columns, it is obvious, by glancing at the table, that an inter- polation at sight will always be easy. B 30 III. RELATIVE HUMIDITY IN HUNDREDTHS. Temper- ature of the air. t — t' = Difference of Temperatures of the Dew Point and of the Air. 0°,0 0°.2 0°,4 0°,6 0°,8 1° 0 1° 2 1° \ 1° 6 1° 8 0)° |) ^° 2 2°,4 2°,6 2° 8 t = • X ' ! Centig. -8 100 98 97 95 94 92 90 89 88 86 85 83 82 80 79 -7 100 98 97 95 94 92 91 89 88 86 85 83 82 81 79 -6 100 98 97 95 94 92 91 89 88 87 85 84 82 81 80 -5 100 98 97 95 94 92 91 89 88 87 85 84 82 81 80 -4 100 98 97 95 94 92 91 89 88 87 85 84 83 81 80 -3 100 98 97 95 94 92 91 90 88 87 85 84 83 81 80 -2 100 98 97 95 94 93 91 90 88 87 86 84 83 82 80 -1 100 98 97 95 94 93 91 90 89 87 86 85 83 82 81 0 100 98 97 96 94 93 91 90 89 87 86 85 83 82 81 4-1 100 99 97 96 95 93 92 90 89 88 86 85 84 83 81 2 100 99 97 96 95 93 92 91 89 88 87 85 84 83 82 3 100 99 97 96 95 93 92 91 89 88 87 86 84 83 82 4 100 99 97 96 95 93 92 91 89 88 87 86 85 83 82 5 100 99 97 96 95 93 92 91 90 88 87 86 85 83 82 6 100 99 97 96 95 93 92 91 90 88 87 86 85 84 82 7 100 99 97 96 95 93 92 91 90 89 87 86 85 84 83 8 100 99 97 96 95 93 92 91 90 89 87 86 85 84 83 9 100 99 97 96 95 94 92 91 90 89 87 86 85 84 83 10 100 99 97 96 95 94 92 91 90 89 87 86 85 84 83 11 100 99 97 96 95 94 92 91 90 89 87 86 85 84 83 ! 12 100 99 97 96 95 94 92 91 90 89 88 87 85 84 83 13 100 99 97 96 95 94 92 91 90 89 88 87 85 84 83 14 100 99 98 96 95 94 93 91 90 89 88 87 86 84 83 15 100 99 98 96 95 94 93 91 90 89 88 87 86 84 83 16 100 99 93 96 95 94 93 91 90 89 88 87 86 85 84 17 100 99 98 96 95 94 93 91 90 89 88 87 86 85 84 18 100 99 93 96 95 94 93 92 90 89 88 87 86 85 84 19 100 99 98 96 95 94 93 92 91 89 88 87 86 85 84 20 100 99 98 96 95 94 93 92 91 89 88 87 86 85 84 21 100 99 98 96 95 94 93 92 91 90 88 87 86 85 84 22 100 99 98 96 95 94 93 92 91 90 89 87 86 85 84 23 100 99 98 96 95 94 93 92 91 90 89 88 86 85 84 24 100 99 98 97 95 94 93 92 91 90 89 88 87 85 84 25 100 99 98 97 95 94 93 92 91 90 89 88 87 86 85 26 100 99 93 97 95 94 93 92 91 90 89 88 87 86 85 27 100 99 98 97 95 94 93 92 91 90 89 88 87 86 85 28 100 99 93 97 95 94 93 92 91 90 89 88 87 86 85 29 100 99 93 97 96 94 93 92 91 90 89 88 87 86 85 30 100 99 98 97 96 94 93 92 91 90- 89 88 87 86 85 31 100 99 98 97 96 94 93 92 91 90 89 83 87 86 85 32 100 99 98 97 96 94 93 92 91 90 89 88 87 86 85 33 100 99 93 97 96 94 93 92 91 90 89 88 87 86 85 34 100 99 98 97 96 95 93 92 91 90 89 88 87 86 85 35 100 99 93 97 96 95 93 92 91 90 89 88 87 86 85 31 RELATIVE HUMIDITY IN HUNDREDTHS. Temper- ature of tne air. , t — t' = Difference of Temperatures of the Dew Point and of the Air. ry 3° 9 1°1 Tfi 8° 8 1°0 4° 9 4° 4 4° 6 /j°8 fi° 0 ^0(J 5° 1 ro fi ro o ' Centig. -8 78 77 75 74 73 72 71 69 68 67 66 65 64 63 62 -7 78 77 75 74 73 72 71 69 68 67 66 65 64 63 62 -6 78 77 76 74 73 72 71 69 68 67 66 65 64 63 62 -5 79 77 76 75 73 72 71 70 68 67 66 65 64 63 62 -4 79 77 76 75 74 73 71 70 69 68 67 66 64 63 62 -3 79 77 76 75 74 73 72 70 69 68 67 66 65 64 63 -2 79 78 77 76 74 73 72 71 70 69 68 66 65 64 63 -1 79 78 77 76 75 73 72 71 70 69 68 67 66 65 64 0 80 78 77 76 75 74 73 71 70 69 68 67 66 65 64 -f-1 80 79 78 77 75 74 73 72 71 70 69 68 66 65 64 2 81 79 78 77 76 75 74 72 71 70 69 68 67 66 65 3 81 80 78 77 76 75 74 73 72 71 70 69 68 66 65 4 81 80 79 78 77 75 74 73 72 71 70 69 68 67 66 5 81 80 79 78 77 76 75 73 72 71 70 69 68 67 66 6 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 7 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 8 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 8 82 80 79 78 77 76 75 74 73 72 71 70 69 68 67 10 82 81 80 78 77 76 75 74 73 72 71 70 69 68 67 11 82 81 80 79 78 76 75 74 73 72 71 70 70 69 68 12 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 13 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 14 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 15 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 16 82 81 80 79 78 77 76 75 74 73 72 71 71 70 69 17 83 81 80 79 78 77 76 75 74 73 73 72 71 70 69 18 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 19 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 20 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 21 83 82 81 80 79 78 77 76 75 74 73 72 71 70 70 22 83 82 81 80 79 78 77 76 75 74 73 73 72 71 70 23 83 82 81 80 79 78 77 76 75 74 74 73 72 71 70 24 83 82 81 80 79 78 77 77 76 75 74 73 72 71 70 25 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 26 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 27 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 28 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 29 84 83 82 81 80 79 78 77 76 75 75 74 73 72 71 30 84 83 82 81 80 79 78 77 76 76 75 74 73 72 71 31 84 83 82 81 80 79 78 77 77 76 75 74 73 72 71 32 84 83 82 81 80 79 79 78 77 76 75 74 73 72 72 33 84 83 82 81 80 80 79 78 77 76 75 74 73 72 72 34 85 84 83 82 81 80 79 78 77 76 75 74 74 73 72 35 85 84 83 82 81 80 79 78 77 76 75 75 74 73 72 B 32 RELATIVE HUMIDITY IN HUNDREDTHS. Temper- ature of the air. t = t — t' = Difference of Temperatures of the Dew Point and of the Air. 6°0 6°,2 6°,4 6°,6 6°,8 7°,0 7°,2 7°,4 7°,6 7°,8 8°,0 80 (j ,Z OO yl o .4 8°,6 fi° fi 0 ,0 Centig. -8 -7 -6 61 60 59 58 57 56 —5 61 60 59 58 58 57 56 55 54 53 52 -4 62 61 60 59 58 57 56 55 54 53 52 -3 62 61 60 59 58 57 56 55 54 53 53 52 51 50 49 -2 62 61 60 60 59 58 57 56 55 54 53 52 51 50 49 -1 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 0 63 62 61 60 59 58 57 56 55 54 53 53 52 51 '50 4-1 63 62 61 61 60 58 58 57 56 55 54 53 52 51 51 2 64 63 62 61 60 59 58 57 56 55 55 54 53 52 51 3 64 63 62 62 60 60 59 58 57 56 55 54 53 53 52 4 65 64 63 62 61 60 59 58 57 56 56 55 54 53 52 5 65 64 63 62 62 61 60 59 58 57 56 55 54 54 53 6 66 65 64 63 62 61 60 59 58 57 57 56 55 54 53 7 66 65 64 63 62 61 60 60 59 58 57 56 55 55 54 8 66 65 64 63 62 62 61 60 59 58 57 56 56 55 54 9 66 65 64 64 63 62 61 60 59 58 58 57 56 55 54 10 67 66 65 64 63 62 61 60 59 59 58 57 56 55 55 11 67 66 65 64 63 62 61 61 60 59 58 57 56 56 55 12 67 66 65 64 63 62 62 61 60 59 58 57 57 56 55 13 67 66 65 64 64 63 62 61 60 59 59 58 57 56 55 14 67 66 66 65 64 63 62 61 60 60 59 58 57 56 56 15 67 67 66 65 64 63 62 61 61 60 59 58 57 57 56 16 68 67 66 65 64 63 63 62 61 60 59 58 58 57 56 17 68 67 66 65 64 64 63 62 61 60 59 59 58 57 56 IS 68 67 66 65 65 64 63 62 61 60 60 59 58 57 57 19 68 67 67 66 65 64 63 62 62 61 60 59 58 58 57 20 68 68 67 66 65 64 63 63 62 61 60 59 59 58 57 21 69 68 67 66 65 64 64 63 62 61 60 60 59 58 57 22 69 68 67 66 65 65 64 63 62 61 61 60 59 58 58 23 69 68 67 67 66 65 64 63 62 62 61 60 59 59 58 24 69 68 68 67 66 65 64 63 63 62 61 60 60 59 58 25 69 69 68 67 66 65 64 64 63 62 61 61 60 59 58 26 70 69 68 67 66 65 65 64 63 62 61 61 60 59 58 27 70 69 68 67 66 66 65 64 63 .62 62 61 60 59 59 28 70 69 68 67 67 66 65 64 63 63 62 61 60 60 59 29 70 69 69 68 67 66 65 64 64 63 62 61 61 60 59 30 70 69 69 68 67 66 65 65 64 63 62 62 61 60 59 31 70 70 69 68 67 66 66 65 64 63 62 62 61 60 60 82 71 70 69 68 67 67 66 65 64 64 63 62 61 61 60 33 71 70 69 68 68 67 66 65 64 64 63 62 61 61 60 34 71 70 69 69 68 67 66 66 65 64 63 62 62 61 60 35 71 70 70 69 68 67 66 66 65 64 63 63 62 61 60 B 33 RELATIVE HUMIDITY IN HUNDREDTHS. Temper- ature of the ait. t — t' = Difference of Temperatures of the Dew Point and of the Air. 9°.0 9°,2 9°,4 9°,6 9°,8 10°,0 10°.8 10° ,4 10°,6 10°,8 ir.o IP? 11°,4 11°,6 11°,8 Centig. -8 -7 -6 -5 -4 q — o -2 -1 0 -fl 50 2 50 49 49 48 47 46 3 51 50 49 48 48 47 46 45 45 44 43 4 51 51 50 49 48 47 47 46 45 44 44 43 42 42 41 5 52 51 50 49 49 48 47 46 46 45 44 43 43 42 41 6 52 52 51 50 49 48 48 47 46 45 45 44 43 43 42 7 53 52 51 51 50 49 48 47 47 46 45 45 44 43 42 8 53 52 52 51 50 49 49 48 47 46 46 45 44 44 43 9 54 53 52 51 50 50 49 48 48 47 46 45 45 44 43 10 54 53 52 51 51 50 49 49 48 47 47 46 45 44 44 11 54 53 53 52 51 50 50 49 48 48 47 46 46 45 44 12 54 54 53 52 51 51 50 49 49 48 47 47 46 45 45 13 55 54 53 52 52 51 50 50 49 48 47 47 46 46 45 14 55 54 53 53 52 51 50 50 49 48 48 47 46 46 45 15 55 54 54 53 52 51 51 50 49 49 48 47 47 46 45 16 55 55 54 53 52 52 51 50 50 49 48 48 47 46 46 17 56 55 54 53 53 52 51 51 50 49 49 48 47 47 46 18 56 55 54 54 53 52 51 51 50 49 49 48 47 47 46 19 56 55 55 54 53 52 52 51 50 50 49 48 48 47 47 20 56 56 55 54 53 53 52 51 51 50 49 49 48 47 47 21 57 56 55 54 54 53 52 52 51 50 50 49 48 48 47 22 57 56 55 55 54 53 53 52 51 50 50 49 49 48 47 23 57 56 56 55 54 53 53 52 51 51 50 49 49 48 48 24 57 57 56 55 54 54 53 52 52 51 50 50 49 48 48 25 58 57 56 55 55 54 53 53 52 51 51 50 49 49 48 26 58 57 56 56 55 54 53 53 52 51 51 50 50 49 48 27 58 57 56 56 55 54 54 53 52 52 51 50 50 49 48 28 58 57 57 56 55 55 54 53 53 52 51 51 50 49 49 29 58 58 57 56 56 55 54 53 53 52 52 51 50 50 49 30 59 58 57 57 56 55 54 54 53 52 52 51 51 50 49 31 59 58 57 57 56 55 55 54 53 53 52 51 51 50 49 32 59 58 58 57 56 56 55 54 54 53 52 52 51 50 50 33 59 59 58 57 56 56 55 54 54 53 52 52 51 51 50 34 60 59 58 57 57 56 55 55 54 53 53 52 52 51 50 35 €0 59 58 58 57 56 56 55 54 54 53 52 52 51 50 B 34 RELATIVE HUMIDITY IN HUNDREDTHS. Temper- ature of the air. t = t — t' = Difference of Temperatures of the Dew Point and of the Air. i8°,o 10 ir,4 ir,6 18°,8 ir.o n°j 15°,4 ll°,6 ir,s 14°,0 14°J 14°,4 14°,6 14°,8 Centig. -8 -7 -6 -5 -4 -3 -2 Tl 0 +1 3 4 40 40 39 38 38 37 5 41 40 39 39 38 38 37 36 36 35 35 6 41 41 40 39 39 38 37 37 36 36 35 35 34 33 33 7 42 41 40 40 39 39 38 37 37 36 36 35 34 34 33 8 42 42 41 40 40 39 38 38 37 37 36 35 35 34 34 9 43 42 41 41 40 40 39 38 38 37 37 36 35 35 34 10 43 43 42 41 41 40 39 39 38 38 37 36 36 35 35 11 44 43 42 42 41 40 40 39 39 38 37 37 36 36 35 12 44 43 43 42 41 41 40 40 39 38 38 37 37 36 36 13 44 44 43 42 42 41 41 40 39 39 38 38 37 37 36 14 45 44 43 43 42 42 41 40 40 39 39 38 37 37 36 15 45 44 44 43 42 42 41 41 40 39 39 38 38 37 37 16 45 44 44 43 43 42 41 41 40 40 39 39 38 38 37 17 45 45 44 43 43 42 42 41 41 40 39 39 38 38 37 18 46 45 44 44 43 43 42 41 41 40 40 39 39 38 38 19 46 45 45 44 43 43 42 42 41 41 40 39 39 38 38 20 46 45 45 44 44 43 42 42 41 41 40 40 39 39 38 21 46 46 45 45 44 43 43 42 42 41 41 40 39 39 38 22 47 46 45 45 44 44 43 43 42 41 41 40 40 39 39 23 47 46 46 45 45 44 43 43 42 42 41 41 40 39 39 24 47 47 46 45 45 44 44 43 42 42 41 41 40 40 39 25 47 47 46 46 45 44 44 43 43 42 42 41 41 40 39 26 48 47 46 46 45 45 44 44 43 42 42 41 41 40 40 27 48 47 47 46 45 45 44 44 43 43 42 42 41 40 40 28 48 48 47 46 46 45 45 44 44 43 42 42 41 41 40 29 48 48 47 47 46 45 45 44 44 43 43 42 42 41 41 30 49 48 47 47 46 46 45 45 44 43 43 42 42 41 41 31 49 48 48 47 46 46 45 45 44 44 43 43 42 42 41 32 49 49 48 47 47 46 46 45 45 44 43 43 42 42 41 33 49 49 48 48 47 46 46 45* 45 44 44 43 43 42 42 34 50 49 49 48 47 47 46 46 45 44 44 43 43 42 42 35 50 49 49 48 48 47 46 46 45 44 44 44 43 43 42 35 TABLE IV. FACTOR -^°, FOR COMPUTING THE RELATIVE HUMIDITY, OR THE DEGREE OF MOISTURE OF THE AIR FROM ITS ABSOLUTE HUMIDITY, GIVEN IN MILLIMETRES. BY HAEGHENS. THE Relative Humidity, or the degree of moisture of the air, is the ratio of the quantity of vapor contained in the air to the quantity it could contain at the tem- perature observed, if fully saturated. If we call The force of vapor contained in the air = f, The maximum of the force of vapor at the temperature of the air = F, The point of saturation = 100, we have the proportion, Relative Humidity : 100 : :/: F, and /xwo __ Reiative Humidity in Hundredths. But as ^XF100 =/ X IT, it is obvious that the operation indicated by the former expression, viz. -^p100, would be reduced to a simple multiplication, if we had a table of the factors F . Such a table is obtained by dividing the constant number 100 by each number in the Table of Elastic Forces of Vapor, and substituting the quotients to the tensions. The following Table, taken from the Annuaire Meteor ologique de la France, for 1650, p. 79, gives the factor -™ for every tenth of a degree from — 10 to -f- 35° Centigrade, corresponding to the Forces of Vapor in Table I. USE OF THE TABLE. The force of vapor contained in the air being given in millimetres, multiply the number expressing it by the factor in the table corresponding to the temperature of the air at the time of the observation ; the result will be the Relative Humidity in Hundredth*. Examples. 1. Suppose the temperature of the air to be = 24° Centigrade. u " force of vapor in the air to be = 10.76 millimetres. Opposite 24° is found in the table the factor 4.51. Then 10.76 X 4.51 = 48.5, Relative Humidity in Hundredths. 2, Suppose the temperature of the air to be = 16.7. " " force of vapor in the air to be = 12.07. Table gives for 16.7 the factor 7.07. Then 12.07 x 7.07 = 85.3, Relative Humidity. B 36 100 FACTOR -p-, TO COMPUTE THE RELATIVE HUMIDITY. t = Temp, of Air, Centig. Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. ?. *. 9. o -10 48.1 48.5 4S.9 49.3 49.7 50.1 50.5 50.9 51.4 51.8 9 44.2 44.6 45.0 45.4 45.7 46.1 46.5 46.9 47.3 47.7 8 40.7 41.1 41.4 41.7 42.1 42.4 42.8 43.1 43.5 43.9 7 37.5 37.8 38.1 38.4 38.7 39.0 39.4 39.7 40.0 40.4 6 34.6 34.9 35.2 35.4 35.7 36.0 36.3 36.6 36.9 37.2 5 31.9 32.2 32.4 32.7 33.0 33.2 33.5 33.8 34.0 34.3 4 29.5 29.8 30.0 30.2 30.5 30.7 31.0 31.2 31.4 31.7 3 27.3 27.5 27.7 27.9 28.2 28.4 28.6 28.8 29.1 29.3 2 25.3 25.5 25.7 25.9 26.1 26.3 26.5 26.7 26.9 27.1 1 23.4 23.6 23.8 24.2 24.0 24.3 24.5 24.7 24.9 25.1 -0 21.7 21.9 22.1 22.2 22.4 22.6 22.8 22.9 23.1 23.3 +0 21.7 21.6 21.4 21.3 21.1 21.0 20.8 20.7 20.5 20.4 1 20.2 20.1 20.0 19.8 19.7 19.5 19.4 19.3 19.1 19.0 2 18.9 18.7 18.6 18.5 18.3 18.2 18.1 18.0 17.8 17.7 3 17.6 17.5 17.3 17.2 17.1 17.0 16.9 16.7 16.6 16.5 4 16.4 16.3 16.2 16.1 15.9 15.8 15.7 15.6 15.5 15.4 5 15.3 15.2 15.1 15.0 14.9 14.8 14.7 14.6 14.5 14.4 6 14.3 14.2 14.1 14.0 • 13.9 13.8 13.7 13.6 13.5 13.4 7 13.4 13.3 13.2 13.1 13.0 12.9 12.8 12.7 12.6 12.6 8 12.5 12.4 12.3 12.2 12.1 12.1 12.0 11.9 11.8 11.7 9 11.7 11.6 11.5 11.4 11.4 11.3 11.2 11.1 11.1 11.0 10 10.9 10.8 10.8 10.7 10.6 10.6 10.5 10.4 10.3 10.3 11 10.2 10.1 10.1 10.0 9.95 9.88 9.82 9.75 9.69 9.63 12 9.56 9.50 9.44 9.38 9.32 9.26 9.20 9.13 9.08 9.02 13 8.96 8.90 8.84 8.79 8.73 8.67 8.62 8.56 8.51 8.45 14 8.40 8.34 8.29 8.24 8.18 8.15 8.08 8.03 7.98 7.92 15 7.87 7.82 7.77 7.72 7.68 7.63 7.58 7.53 7.48 7.43 16 7.39 7.34 7.29 7.25 7.20 7.16 7.11 7.07 7.02 6.98 17 6.93 6.89 6.85 6.80 6.76 6.72 6.68 6.63 6.59 6.55 18 6.51 6.47 6.43 6.39 6.35 6.31 6.27 6.23 6.19 6.16 19 6.12 6.08 6.04 6.00 5.97 5.93 5.89 5.86 5.82 5.79 20 5.75 5.71 5.68 5.64 5.61 5.58 5.54 5.51 5.47 5.44 21 5.41 5.37 5.34 5.31 5.27 5.24 5.21 5.18 5.15 5.12 22 5.09 5.06 5.02 4.99 4.96 4.93 4.90 4.87 4.85 4.82 23 4.79 4.76 4.73 4.70 4.67 4.65 4.62 4.59 4.56 4.53 24 4.51 4.48 4.45 4.43 4.40 4.37 4.35 4.32 4.30 4.27 25 4.25 4.22 4.20 4.17 4.15 4.12 4.10 4.07 4.05 4.03 26 4.00 3.98 3.95 3.93 3.91 3.89 3.86 3.84 3.82 3.79 27 3.77 3.75 3.73 3.71 3.69 3.66 3.64 3.62 3.60 3.58 28 3.56 3.54 3.52 3.50 3.48 3.46 3.44 3.42 3.40 3.38 29 3.36 3.34 3.32 3.30 3.28 3.26 3.24 3.22 3.21 3.19 30 3.17 3.15 3.13 3.12 3.10 3.08 3.06 3.05 3.03 3.01 31 2.99 2.98 2.96 2.94 2.93 2.91 2.89 2.88 2.86 2.84 32 2.S3 2.81 2.80 2.78 2.77 2.75 2.73 2.72 2.70 2.69 33 2.67 2.66 2.64 2.63 2.61 2.60 2.58 2.57 2.56 2.54 34 2.53 2.51 2.50 2.49 2.47 2.46 2.44 2.43 2.42 2.40 35 2.39 2.38 2.36 2.35 2.34 2.33 2.31 2.30 2.29 2.28 B 37 TABLE V. WEIGHT OF VAPOR, IN GRAMMES, CONTAINED IN A CUBIC METRE OF SATURATED AIR UNDER A BAROMETRIC PRESSURE OF 760 MILLIMETRES, AND AT TEMPERATURES BETWEEN — 20° AND -[-40° CENTIGRADE. THE theoretic density of aqueous vapor is very nearly 0.622, or f , of the density of the air at the same temperature and pressure. Regnault's experiments gave similar results. From this ratio the weight of the vapor contained in a given volume of air, the temperature and humidity of which are known, can be computed. If we call t = the temperature of the air ; f= the elastic force of the vapor contained in the air at the time of the observation ; F = the maximum elastic force of vapor due to the temperature t, as given in the table ; p — the weight of the vapor contained in a litre of air at the temperature t, and with a force of vapor/; P = the weight of vapor in a litre of air at the temperature t, and at full saturation, or F. Then, p = 0.622 - In which 1.293223 grammes is the weight of a litre of dry air, at the temperature of zero Centigrade, and under a barometric pressure of 760 millimetres, according to the determination of Regnault ; 0.00367, the coefficient of the expansion of the air as found by the same ; 760 millimetres, the assumed normal barometric pressure. The weight of a litre of air given by Regnault in the Memoires de Tlnstitut, Tom. XXI. p. 157, is 1.293187 grammes ; but by correcting a slight error of computation (see E. Ritter, Memoires de la Societe Physique de Geneve, Tom. XIII. p. 361), it be- comes, as given above, 1.293223 grammes. In order to obtain the weight of vapor in a cubic metre, or 1000 litres, of saturated air, the formula becomes, p =0.622 1293-223'r- _£; 1-f- 0.00367 1 760mm- From this formula Table V. has been computed. The tensions due to the tem- peratures in the first column are placed opposite the weights of vapor ; they are taken from Table I. It will be seen that, throughout the table, the number of grammes of vapor nearly corresponds to the number of millimetres of pressure ex- pressing the tension. The table of the weights of vapor given in Pouillet's Elements des Physique, Tom. II. p. 707, being based on older values, gives results somewhat different. In that pub- lished by Becquerel, Elements de Physique Terrestre, p. 354, Regnault's tensions and coefficient of expansion of the air have been used, but the value of the weight of vapor in a litre of air formerly determined by Biot and Arago, viz. 1.29954 grammes, has been retained. B 38 V. WEIGHT OF VAPOR, IN GRAMMES, CONTAINED IN A CUBIC METRE OF SATURATED AIR, At Temperatures between — 20o and +40o Centigrade. Temperature of Dew-Point. Force of Vapor. Weight of Vapor. Difference. Temperature of Dew-Point. Force of Vapor. Weight of Vapor. Difference. Centigrade. Millimetres. Grammes. Grammes. Centigrade. Millimetres. Grammes. Grammes. -20° 0.912 .042 +10° 9.165 9.357 -19 0.993 .130 0.088 11 9.792 9.962 0.605 0.094 0-639 -18 1.080 .224 12 10.457 10.601 -17 1.174 .325 0.101 13 11.162 11.276 0.675 -16 1.275 .434 0.109 14 11.908 11.988 0.712 -15 1.385 1.551 0.118 15 12.699 12.739 0.751 -14 1.503 1.678 0.127 16 13.536 13.532 0.793 -13 1.631 1.813 0.134 17 14.421 14.367 0.835 -12 1.768 1.957 0.145 18 15.357 15.247 0.880 -11 1.918 2.114 0.157 19 16.346 16.173 0.926 -10 2.078 2.283 0.169 20 17.391 17.148 0.975 - 9 2.261 2.475 0.192 21 18.495 18.174 1.026 - 8 2.456 2.678 0.203 22 19.659 19.253 1.076 - 7 2.666 2.896 0.218 23 20.888 20.387 1.134 -6 2.890 3.128 0.232 24 22.184 21.579 1.192 0.248 .252 - 5 3.131 3.376 25 23.550 22.831 - 4 3.387 3.638 0.262 26 24.988 24.144 .313 - 3 3.662 3.919 0.281 27 26.505 25.524 .380 - 2 3.955 4.217 0.298 28 28.101 26.971 .447 - 1 4.267 4.534 0.317 29 29.782 28.489 .519 0 4.600 4.869 0.334 30 31.548 30.079 1.589 + 1 4.940 5.209 0.341 31 33.405 31.744 1.666 2 5.302 5.571 0.361 32 35.359 33.491 1.747 3 5.687 5.953 0.383 33 37.410 ~ 35.317 1.827 4 6.097 6.360 0.406 34 39.565 37.230 1.913 5 6.534 6.791 0.431 35 41.827 39.231 2.001 6 6.998 7.247 0.456 36 44.201 41.323 2.092 7 7.492 7.731 0.484 37 46.691 43.510 2.187 8 8.017 8.243 0.512 38 49.302 45.795 2.285 9 8.574 8.785 0.541 39 52.039 48.182 2.387 +10 9.165 9.357 0.572 +40 54.906 50.674 2.492 B 39 PRACTICAL TABLES, ENGLISH MEASURES, BASED ON REGNAULTS HYGROMETRICAL CONSTANTS. B 41 VI. TABLE OF THE ELASTIC FORCE OF AQUEOUS VAPOR, EXPRESSED IN ENGLISH INCHES OF MERCURY FOR TEMPERATURES OF FAHRENHEIT, THE values of the elastic force of vapor furnished by V. Regnault, which are found in Table I. of this Hygrometrical set, are derived from a series of experiments conducted, during several years, with great care, consummate skill, and all the means of precision which are at the disposal of modern science. The methods of investi- gation, and all the steps in each experiment, were minutely described and submitted to the judgment of the scientific, successively in separate papers in several volumes of the Annales de Chimie et de Physique, and collectively in his final Report to the Minister of Public Works, (see above, p. 9,) which fills Volume XXI. of the Me- moires de VInstitut de France. The confidence which has been deservedly granted to these determinations by nearly all scientific men, is increased by the fact that one of the best physicists and experimenters in Germany, Professor Magnus, came, about the same time, to results so little different, that both tables, for most purposes, may be considered identical. (Compare below, Table XXII.) It seems, therefore, that these values ought to be used in our hygrometrical tables, as has been done in France, in preference to the older and less reliable determinations on which they are based. Though Regnault's table of the elastic force of vapor is considered, even, it is be- lieved, by a majority of scientific men in England, as the most reliable which science now possesses, the author is not aware that any extensive reduction of it to English measures, such as is wanted for meteorological purposes, has been as yet published ; still less a series of tables based on these values. Such a set of hygrometrical tables in English measures, corresponding to the preceding one in French measures, is offered here, which, it is hoped, supplies a real want felt by a large number of me- teorologists. Table VI. is Regnault's Table of the Elastic Force of Vapor as given in Table I., reduced to English measures, in which the fourth decimal is given in order to secure the third, and otherwise to facilitate the computations. From these values Tables VII. to X. have been computed. B 42 VI. ELASTIC FORCE OF AQUEOUS VAPOR, EXPRESSED IN ENGLISH INCHES OF MERCURY FOB TEMPERATURES OF FAHRENHEIT. REDUCED FROM REGNAULT'S TABLE. Temper- ature Fahren- heit. Force of Vapor. Temper- ature Fahren- heit. Force of Vapor. Temper- ature Fahren- heit. Force of Vapor. Temper- ature Fahren- heit. Force of Vapor. Tenths of Degrees. Tenths of Degrees. Tenths of Degrees. Tenths of Degrees. 0 0.5 O 0.5 0 0.5 O 0.5 Eng. In. 0.0485 -31 Eng. In. ] 0.0087 Sng. In. 0.0085 -19 Eng. In. 0.0171 Eng. In. 0.0167 - 8 Eng. In. 0.0297 Eng. In. 0.0290 + 2 Eng. In 0.0476 -30 0.0092 0.0090 -18 0.0181 0.0176 - 7 0.0312 0.0304 3 0.0498 0.0510 -29 0.0098 0.0095 -17 0.0190 0.0185 - 6 0.0327 0.0319 4 0.0521 0.0533 -28 0.0104 0.0101 -16 0.0200 0.0195 - 5 0.0343 0.0335 5 0.0545 0.0558 -27 0.0110 0.0107 -15 0.0210 0.0205 - 4 0.0359 0.0351 6 0.0570 0.0584 -26 0.0117 0.0114 -14 0.0221 0.0216 - 3 0.0376 0.0368 7 0.0597 0.0611 -25 0.0124 0.0120 -13 0.0232 0.0227 - 2 0.0395 0.0386 8 0.0625 0.0639 -24 0.0131 0.0127 -12 0.0244 0.0238 - 1 0.0414 0.0404 9 0.0654 0.0669 -23 0.0138 0.0135 -11 0.0257 0.0250 - 0 0.0434 0.0424 10 0.0684 0.0700 -22 0.0146 0.0142 -10 0.0270 0.0263 + 0 0.0434 0.0444 11 0.0716 0.0732 -21 0.0154 0.0150 - 9 0.0283 0.0276 + 1 0.0454 0.0465 12 0.0749 0.0766 -20 0.0163 0.0158 - 8 0.0297 0.0290 + 2 0.0476 0.0487 +13 0.0783 0.0800 Temper- ature Fahren- heit. Tenths of Degrees. 0. 1. 2. Eng. In. 0.0826 3. Eng. In. 0.0830 4. 5. 6. ?. 8. 9. 0 14 Eng. In. 0.0818 Eng. In. 0.0822 Eng. In. 0.0834 Eng. In. 0.0837 Eng. In. 0.0841 Eng. In. 0.0845 Eng. In. 0.0849 Eng. In. 0.0853 15 0.0857 0.0861 0.0865 0.0869 0.0873 0.0877 0.0881 0.0885 0.0889 0.0893 16 0.0898 0.0902 0.0906 0.0910 0.0914 0.0918 0.0923 0.0927 0.0931 0.0936 17 0.0940 0.0944 0.0949 0.0953 0.0958 0.0962 0.0967 0.0971 0.0975 0.0980 18 0.0984 0.0989 0.0993 0.0998 0.1002 0.1007 0. 1012 0.1016 0.1021 0.1025 19 0.1030 0.1035 0.1040 '0.1044 0.1049 0.1054 0. 1059 0.1064 0.1068 0.1073 20 0.1078 0.1083 0.1088 0.1093 0.1098 0.1103 0. 1108 0.1113 0.1118 0.1123 21 0.1128 0.1133 0.1138 0.1143 0.1148 0.1153 0. 1159 0.1164 0.1169 0.1174 22 0.1179 0.1185 0.1190 0.1195 0.1200 0.1206 0. 1211 0.1217 0.1222 0.1227 23 0.1233 0.1238 0.1244 0.1249 0.1255 0.1260 0. 1266 0.1272 0.1277 0.1283 24 0.1289 0.1295 0.1300 0.1306 0.1312 0.1318 0.1324 0.1329 0.1335 0.1341 25 0.1347 0.1353 0.1359 0.1365 0.1371 0.1377 0.1383 0.1389 0.1395 0.1401 26 0.1407 0.1413 0.1419 0.1426 0.1432 0.1438 0.1444 0.1450 0.1457 0.1463 27 0.1469 0.1476 0.1482 0.1488 0.1495 0.1501 0.1508 0.1514 0.1521 0.1527 28 0.1534 0.1540 0.1547 0.1553 0.1560 0.1567 0. 1573 0.1580 0.1587 0.1593 29 0.1600 0.1607 0.1613 0.1620 0.1627 0.1634 0. 1641 0.1647 0.1654 0.1661 30 0.1668 0.1675 0.1682 0.1689 0.1696 0.1703 0. 1710 0.1717 0.1724 0.1732 31 0.1739 0.1746 0.1753 0.1760 0.1767 0.1775 0. 1782 0.1789 0.1796 0.1804 O. 1. 2. 3. 4. 5. 0. 7, 8. 9. B 43 2 ELASTIC FORCE OF AQUEOUS VAPOR. REGNAULT. EXPRESSED IN ENGLISH INCHES OF MERCURY FOR TEMPERATURES OF FAHRENHEIT. Tenths of Degrees. Tempera- ture of Fahren- heit. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. o Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. 32 0.1811 0.1818 0.1825 0.1833 0.1840 0.1847 0.1854 0.1861 0.1S69 0.1876 33 0.1883 0.1891 0.1898 0.1906 0.1913 0.1921 0.1928 0.1936 0.1944 0.1951 34 0.1959 0.1967 0.1974 0.1982 0.1990 0.1998 0.2006 0.2013 0.2021 0.2029 35 0.2037 0.2045 0.2053 0.2061 0.2070 0.2077 0.2086 0.2094 0.2102 0.2111 36 0.2119 0.2127 0.2135 0.2144 0.2152 0.2161 0.2169 0.2178 0.2186 0.2195 4 37 0.2204 0.2212 0.2221 0.2230 0.2238 0.2247 0.2256 0.2265 0.2273 0.2282 38 0.2291 0.2300 0.2309 0.2318 0.2327 0.2336 0.2345 0.2354 0.2364 0.2373 39 0.2382 0.2391 0.2400 0.2410 0.2419 0.2428 0.2438 0.2447 0.2457 0.2466 40 0.2476 0.2485 0.2495 0.2504 0.2514 0.2524 0.2533 0.2543 0.2553 0.2563 41 0.2572 0.2582 0.2592 0.2602 0.2612 0.2622 0.2632 0.2642 0.2652 0.2662 42 0.2672 0.2682 0.2692 0.2702 0.2713 0.2723 0.2733 0.2744 0.2754 0.2764 43 0.2775 0.2785 0.2796 0.2807 0.2817 0.2828 0.2839 0.2850 0.2860 0.2871 44 0.2882 0.2893 0.2904 0.2915 0.2926 0.2937 0.2948 0.2960 0.2971 0.2982 45 0.2993 0.3005 0.3016 0.3028 0.3039 0.3050 0.3062 0.3074 0.3085 0.3097 46 0.3108 0.3120 0.3132 0.3144 0.3156 0.3168 0.3179 0.3191 0.3203 0.3215 47 0.3228 0.3240 0.3252 0.3264 0.3276 0.3289 0.3301 0.3313 0.3326 0.3338 48 0.3351 O.B363 0.3376 0.3388 0.3401 0.3414 0.3426 0.3439 0.3452 0.3465 49 0.3477 0.3490 0.3503 0.3516 0.3529 0.3542 0.3556 0.3569 0.3582 0.3595 50 0.3608 0.3622 0.3635 0.3648 0.3661 0.3675 0.3688 0.3702 0.3715 0.3729 51 0.3743 0.3756 0.3770 0.3784 0.3798 0.3812 0.3826 0.3840 0.3854 0.3868 52 0.3882 0.3896 0.3911 0.3925 0.3939 0.3954 0.3968 0.3983 0.3997 0.4012 53 0.4027 0.4041 0.4056 0.4071 0.4086 0.4101 0.4116 0.4131 0.4146 0.4161 54 0.4176 0.4191 0.4207 0.4222 0.4237 0.4253 0.4268 0.4284 0.4299 0.4315 35 0.4331 0.4346 0.4362 0.4378 0.4394 0.4410 0.4426 0.4442 0.4458 0.4474 56 0.4490 0.4507 0.4523 0.4539 0.4556 0.4572 0.4589 0.4605 0.4622 0.4638 57 0.4655 0.4672 0.4689 0.4705 0.4722 0.4739 0.4756 0.4773 0.4791 0.4808 58 0.4825 0.4842 0.4859 0.4876 0.4894 0.4912 0.4929 0.4947 0.4964 0.4982 59 0.5000 0.5017 0.5035 0.5053 0.5071 0.5089 0.5107 0.5125 0.5143 0.5161 60 0.5179 0.5198 0.5216 0.5234 0.5253 0.5271 0.5290 0.5301 0.5328 0.5346 61 0.5365 0.5384 0.5403 0.5422 0.5441 0.5461 0.5480 0.5499 0.5519 0.5538 62 0.5558 0.5577 0.5597 0.5617 0.5636 0.5656 0.5676 0.5696 0.5716 0.5736 63 0.5756 0.5777 0.5797 0.5817 0.5838 0.5858 0.5879 0.5899 0.5920 0.5941 64 0.5962 0.5983 0.6004 0.6025 0.6046 0.6067 0.6088 0.6109 0.6131 0.6152 65 0.6173 0.6195 0.6217 0.6238 0.6260 0.6282 0.6304 0.6325 0.6347 0.6369 66 0.6392 0.6414 0.6436 0.6458 0.6481 0.6503 0.6525 0.6548 0.6571 0.6593 67 0.6616 0.6639 0.6662 0.6685 0.6708 0.6731 0.6754 0.6777 0.6800 0.6824 0. 1. 2. 3. 4. 5. 6. •7. 8. 9. B 44 ELASTIC FORCE OF AQUEOUS VAPOR. REGNAULT. ^ 3 EXPRESSED IN ENGLISH INCHES OF MERCURY FOR TEMPERATURES OF FAHRENHEIT. Tempera- ture of Fahren- heit. Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. o 68 Eng. In. 0.6347 Eng. In. 0.6870 Eng. In. 0.6894 Eng. In. 0.6917 Bag. In. 0.'6941 Eng. In. 0.6965 Eng. In. 0.6989 Eng. In. 0.7012 Eng. In. 0.7036 Eng. In. 0.7060 69 0.7084 0.7108 0.7133 0.7157 0.7181 0.7206 0.7230 0.7255 0.7280 0.7305 70 0.7329 0.7354 0.7379 0.7405 0.7430 0.7455 0.7480 0.7506 0.7531 0.7557 71 0.7583 0.7609 0.7634 0.7660 0.7686 0.7712 0.7739 0.7765 0.7791 0.7818 72 0.7844 0.7871 0.7897 0.7924 0.7951 0.7978 0.8005 0.8032 0.8059 0.8086 73 0.8113 0.8141 0.8168 0.8196 0.8223 0.8251 0.8279 0.8307 0.8335 0.8363 74 0.8391 0.8419 0.8447 0.8476 0.8504 0.8533 0.8561 0.8590 0.8619 0.8648 75 0.8676 0.8705 0.8735 0.8764 0.8793 0.8822 0.8852 0.8881 0.8911 0.8940 76 0.8970 0.9000 0.9030 0.9060 0.9090 0.9120 0.9150 0.9180 0.9211 0.9241 77 0.9272 0.9302 0.9363 0.9364 0.9395 0.9426 0.9457 0.9488 0.9519 0.9550 78 0.9582 0.9613 0.9645 0.9677 0.9709 0.9740 0.9773 0.9805 0.9837 0.9869 79 0.9902 0.9934 0.9967 1.0000 1.0033 1.0065 1.0099 1.0132 1.0165 1.0198 80 1.0232 1.0265 1.0299 1.0332 1.0366 1.0400 1.0434 1.0468 1.0503 1.0537 81 1.0572 1.0606 1.0641 1.0675 1.0710 1.0745 1.0780 1.0815 1.0851 1.0886 82 1.0922 1.0957 1.0993 1.1028 1.1064 1.1100 1.1136 1.1172 1.1209 1.1245 83 1.1281 1.1318 1.1354 1.1391 1.1428 1.1465 1.1502 1.1539 1.1576 1.1614 84 1.1651 1.1689 1.1726 1.1764 1.1802 1.1840 1.1878 1.1916 1.1954 1.1993 85 1.2031 1.2070 1.2108 1.2147 1.2186 1.2225 1.2264 1.2303 1.2342 1.2381 86 1.2421 1.2460 1.2500 1.2540 1.2580 1.2620 1.2660 1.2700 1.2740 1.2781 87 1.2821 1.2862 1.2903 1.2944 1.2985 1.3026 1.3068 1.3109 1.3151 1.3192 88 1.3234 1.3276 1.3318 1.3361 1.3403 1.3445 1.3488 1.3531 1.3573 1.3616 89 1.3659 1.3703 1.3746 1.3789 1.3833 1.3877 1.3920 1.3964 1.4008 1.4053 90 1,4097 1.4141 1.4186 1.4230 1.4275 1.4320 1.4365 1.4410 1.4456 1.4501 91 1.4546 1.4592 1.4638 1.4684 1.4730 1.4776 1.4822 1.4869 1.4915 1.4962 92 1.5008 1.5055 1.5102 1.5149 1.5197 1.5244 1.5291 1.5339 1.5387 1.5435 93 1.5482 1.5531 1.5579 1.5627 1.5676 1.5724 1.5773 1.5822 .5871 1.5920 94 1.5969 1.6018 1.6068 1.6117 1.6167 1.6217 1.6267 1.6317 .6367 1.6417 95 1.6468 1.6518 1.6569 1.6620 1.6671 1.6722 1.6773 1.6825 .6876 1.6928 96 1.6980 1.7032 1.7084 1.7137 1.7189 1.7242 1.7295 1.7348 .7401 1.7454 97 1.7508 1.7561 1.7615 1.7669 1.7723 1.7777 1.7831 1.7886 .7940 1.7995 98 1.8050 1.8105 1.8160 1.8215 1.8271 1.8327 1.8382 1.8438 .8494 1.8551 99 1.8607 1.8664 1.8720 1.8777 1.8834 1.8891 1.8949 1.9006 1.9064 1.9121 100 1.9179 1.9237 1.9295 1.9354 1.9412 1.9471 1.9530 1.9589 1.9648 1.9707 101 1.9766 1.9826 1.9885 1.9945 2.0005 2.0065 2.0126 2.0186 2.0247 2.0307 102 2.0368 2.0429 2.0490 2.0552 2.0613 2.0675 2.0737 2.0798 2.0861 2.0923 103 2.0985 2.1048 2.1110 2.1173 2.1236 2.1299 2.1362 2.1426 2.1489 2.1553 104 2.1617 2.1681 2.1745 2.1810 2.1874 2.1939 2.2004 2.2069 2.2135 2.2200 9. 0. 1. 2. 3. 4. 5. 6. 7. 8. B 45 VII. PSYCHROMETRICAL TABLES, GIVING, IN ENGLISH INCHES OF MERCURY, THE ELASTIC FORCE OF VAPOR CONTAINED IN THE AIR, AND ITS RELATIVE HUMIDITY A* HUNDREDTHS ; DERIVED FROM THE INDICATIONS OF THE WET AND DRY BULB THERMOMETERS, IN DEGREES OF FAHRENHEIT. BY A. GUYOT.* • -..<• i '. ;- . ' ' .: . M. V. REGNAULT, in his Etudes sur THygrometrie Annales de Chimie et de Phy- sique, 3°^ serie, Tom. XV. p. 129, after having discussed the theoretical bases of the psychrometric formula given by August, and modified the numerical values of some of its coefficients, adopts the formula 0.480 0-Q * 610 — V for temperatures above the freezing-point ; and when the temperature of the wet ther- mometer is below the freezing-point, the bulb being covered with a film of ice, 0.480 - # While this table was going through the press, a similar one, prepared by Prof. T. H. Coffin for his private use, was published by the Smithsonian Institution, in order to meet an urgent demand from many quarters. Being based on the same formula, it gives the same results, except, perhaps, in degrees below 14° Fahrenheit, where the tables show slight discrepancies. These unimportant differences arise from the fact that Prof. Coffin's table was computed from Regnault's tensions, as given in the first edition of this collection, while the author's table is based on the table of tensions as given in this second edition, in which the values below 14° Fahrenheit have been somewhat modified, for reasons given above. The following table gives also the relative humidity with one more decimal, which makes the interpolations more easy ; and a column of differences for finding the values for fractions of t'. A table for reducing the results to another barometric height is added at the end of the table. B 46 PSYCHROMETRICAL TABLES. in which x represents the force of vapor in the air at the time of the observation ; t, the temperature of the air in Centigrade degrees, indicated by the dry thermometer ; 2', the temperature of evaporation given by the wet thermometer ; /, the force of vapor in a saturated air at the temperature t' ; A, the height of the barometer. Substituting the Fahrenheit scale for the Centigrade, the formula, for temperatures above the freezing-point, reads 0.480 X $ (t — <') f __ 0480 (<_-- f) , . ~ J-- 610 — f(Z'— 32°) ~J ' 1130— Y and below the freezing-point, . f __ 0.480 X | (t — t') h _ f _ 0.480 Q — Q / " 689 — | (*' — 32°) ^ " 1240.2 — t' Making, further, h = 29.7 English inches, these formulae become and 0.480 0-Q =_ 14.256 * — ' J 1240.2 — t' 1240.2 — The mean barometric pressure for which the table has been computed, viz. 29.7 inches, is, within a small fraction, the same as that adopted in Haeghens's Tables, No. II., which is 755 millimetres = 29.725 Eng. inches. As that slight difference in the barometric pressure cannot cause, in the most extreme cases, a difference ex- ceeding two thousandths of an inch in the elastic forces, the results in the two tables may be considered identical. That barometric pressure, corresponding, in our latitudes, to a mean altitude of 250 to 300 feet above the sea, is likely to suit, without correction, the largest number of meteorological stations. Should the mean height of the barometer, in consequence of the elevation of the station, much differ from that adopted in the table, a constant correction can be determined, to be applied to the numbers in the table. At the end, page 72, will be found a table which furnishes that correction for barometric heights between 20 and 31 inches, and for values of t — t1 between 2° and 26° Fahrenheit. The effect of the irregular variations of the barometer at the same station can, in most cases, be neglected ; for the error due to that cause will scarcely ever exceed those which may arise from the uncertainty of the very elements on which the tables are based. B 47 PSYCHROMETRICAL TABLES. ARRANGEMENT OF THE TABLES. The same arrangement as is found in the Psychrometrical for the Centigrade scale has been adopted. The first column at the left contains the indications of the wet-bulb thermometer, from — 31° to 105° Fahrenheit. The second column gives the differences of the force of vapor for each tenth of a degree, between each two consecutive full degrees in the first column. It enables the observer easily to find the values for the fractions of degrees of the wet thermometer. The following double columns furnish the forces of vapor and the relative humidity corresponding to each full degree of the wet-bulb thermometer given in the first column in the same horizontal line, and to the difference of the two thermometers, or t — t1, found at the head of each column, for every half-degree from 0° to 26°. 5. The relative humidity, or the fraction of saturation, is given in hundredths, which is near enough for meteorological purposes ; but one decimal more has been added, though separated by a point, in order to facilitate the interpolations. At the bottom of each page is found the mean difference, for each tenth of a degree, between the forces of vapor on the same line. It gives the means of finding the values for the intermediate differences of t — 2', not found in the tables. USE OF THE TABLES. Enter the tables with the difference of the two thermometers, or t — £', and the temperature of the wet-bulb thermometer, given by observation. In the column headed by the observed difference of the thermometer, t — t', and on the horizontal line headed by the observed temperature of the wet thermometer, £', are found the force of vapor, and the relative humidity corresponding to these tem- peratures. For the fractions of degrees of the wet thermometer, multiply the decimal fraction by the number placed in the second column between the full degree and the next, and add the product if the temperature is above, and subtract it if it is below zero Fahrenheit. The intermediate values of t — t1 not given in the table are found by subtracting the number in the line at the bottom of the page, multiplied by the number of addi- tional tenths, from the value given in the table. This correction, being always very small, can usually be neglected. For the relative humidity, interpolations at sight will generally suffice. Examples. 1- Dry thermometer, t = 50° F. Wet thermometer, t' = 43° F. Difference, or t — t' = 7° F. Page 58, we find for t — t' =•- 7° in the third double column, and for t' = 43° in the first column Force of vapor in the air — 0.186 inch. Relative humidity in hundredths = 51 B 48 PSYCHROMETRICAL TABLES. 2. Dry thermometer, t = 88°. 5 F. Wet thermometer, t' = 76° .3 F. Difference, t — t>= 12°.2 F. Page 63, Table gives for t — t'— 12 and t1 — 76° ' '== 0.735 inch. Add for fraction of t' = 0.3, 0.003 X 3 = 0.009 Subtract for fraction of t — t' = 0°.2, .0013 X 2 = —0.003 Force of vapor in the air = 0.741 Relative humidity = 55 3. Dry thermometer, t — — 4°.5 F. Wet thermometer, t' = 6°.0 F. Difference, t — t'= 1°.5 F. Page 50, Table gives for t — ti= 1°.5 and t' = — 6° = 0.016 inch. Subtract for fraction of t1 = 0.5, 0.0002 X 5 = — 0.001 Force of vapor in the air = 0.015 Relative humidity = 45 B 49 VII. PSYCHROMETRICAL TABLES. Temperature, Fahrenheit. — Force of Vapor in English Inches. —Relative Humidity in Hundredth 3. t — t', or Difference of Wet and Dry Bulb Thermometers. TTT-1, t', below the Freezing-Point ; the Bulb covered with a Film of Ice. wet- Bulb Vertical Thermo- Difference o°.o O°«e> 1°.O 1°»5 2°.O 2°. 5 meter of Force of Vapor Fahren- for each Rela- Rela- Rela- Rela- Rela- Rela- heit. 0°.l. Force of tive Hu- Force of tive Hu- Force of tive Hu- Force of tive Hu- Force of tive Hu- Force of tive Hu- Vapor. mid- Vapor mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- ity. ity. ity. ity. ity. ity. o Eng. In. Eng. In Eng. In. Eng. In. Eng. In. Eng. In. -31 0.009 100 0.003 36.0 -30 .00005 0.009 100 0.004 39.6 -29 .00006 0.010 100 0.004 42.9 -28 .00006 0.010 100 0.005 46.1 -27 .00006 0.011 100 0.006 49.0 .00006 -26 0.012 100 0.006 51.8 -25 .00007 0.012 100 0.007 54.4 -24 .00007 0.013 100 0.008 56.8 -23 .00008 0.014 100 0.008 59.0 -22 .00008 0.015 100 0.009 61.0 .00008 -21 0.015 100 0.010 62.6 0.004 26.9 -20 .00008 0.016 100 0.011 64.2 0.005 30.3 -19 .00008 0.017 100 0.012 65.9 0.006 33.5 -18 .00009 0.018 100 0.012 67.5 0.007 36.6 -17 .0001 0.019 100 0.013 69.0 0.008 39.5 .0001 -16 0.020 100 0.014 70.4 0.009 42.3 -15 .0001 0.021 100 0.015 71.8 0.010 44.9 0.004 19.4 -14 .0001 0.022 100 0.017 73.0 0.011 47.4 0.005 23.0 -13 .0001 0.023 100 0.018 74.3 0.012 49.8 0.007 26.4 -12 .0001 0.024 100 0.019 75.4 0.013 51.9 0.008 29.5 .0001 -11 0.026 100 0.020 76.5 0.014 53.9 0.009 32.5 -10 .0001 0.027 100 0.021 77.5 0.016 55.7 0.010 35.3 0.005 15.6 - 9 .0001 0.028 100 0.023 78.5 0.017 57.7 0.012 38.3 0.006 19.1 - 8 .0001 0.030 100 0.024 79.4 0.018 59.4 0.013 40.6 0.007 22.5 - 7 .0001 0.031 100 0.026 80.3 0.020 61.1 0.014 43.0 0.009 25.7 - 6 .0001 0.033 100 0.027 81.1 0.021 62.7 0.016 45.4 0.010 28.4 0.005 12.9 .0002 - 5 0.034 100 0.029 81.8 0.023 64.5 0.017 47.6 0.012 31.7 0.006 16.4 - 4 .0002 0.036 100 0.030 82.5 0.025 65.8 0.019 49.8 0.014 34.5 0.008 19.8 - 3 .0002 0.038 100 0.032 83.2 0.026 67.1 0.021 51.7 0.015 36.9 0.010 22.8 - 2 .0002 0.039 100 0.034 83.9 0.028 68.3 0.023 53.5 0.017 39.3 0.011 25.8 - 1 .0002 0.041 100 0.036 84.5 0.030 69.5 0.024 55.3 0.019 41.6 0.013 28.6 - 0 .0002 0.043 100 0.038 85.0 0.032 71.0 0.026 57.0 0.021 43.8 0.015 31.3 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.0012. 50 PSYCHROMETRIOAL TABLES. Temperature, Fahrenheit. — Force of Vapor in English Inches. — Relative Humidity in Hundredths. t — t', or Difference of Wet and Dry Bulb Thermometers. \r~n~ t', below the Freezing-Point , the Bulb covered with a Film of Ice. Wet- Bulb JV1 o Jin Vertical Thermo- Difference o°.o 0°.5 1°.O 1°.5 2°.O 2°.5 meter £ of Force Fahren- for each JRela- Rela- Rela- Rela- Rela- Rela- heit. 0°.l. t.ivn tive tive tive tive tive Hu- Force of Hu- Force of Hu- Force of Hu- Force of Hu- Force of Hu- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- ity. ity. ity. ity. ity. ity 0 Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In 0 0.043 100 0.038 85.0 0.032 70.7 0.026 57.0 0.021 43.8 0.015 31.3 ! 1 0.000-2 0.045 100 0.040 85.6 0.034 71.8 0.028 58.6 0.023 46.0 0.017 33.9 ! 2 .000-2 0.047 100 0.042 86.2 0.036 73.0 0.031 60.2 0.025 48.0 0.019 36.4 3 .0002 0.050 100 0.044 86.7 0.038 74.0 0.033 61.8 0.027 50.0 0.022 38.8 4 .0002 0.052 100 0.046 87.2 0.041 75.0 0.035 63.3 0.030 52.0 0.024 41.2 .000-2 5 0.055 100 0.049 87.7 0.043 76.0 0.038 64.7 0.032 53.8 0.026 43.4 6 .0002 0.057 100 0.051 88.2 0.046 76.9 0.040 66.0 0.034 55.3 0.029 45.2 7 .0003 0.059 100 0.054 88.6 0-048 77.7 0.043 67.1 0.037 56.8 0.031 47.0 8 .0003 0.062 100 0.057 89.0 0.051 78.4 0.045 68.2 0.040 58.2 0.034 48.8 9 .0003 0.065 100 0.059 89.4 0.054 79.1 0.048 69.2 0.043 59.6 0.037 50.5 .0003 10 0.068 100 0.062 89.8 0.057 79.7 0.051 70.1 0.046 61.0 0.040 52.2 11 .0003 0.071 100 0.066 90.1 0.061 80.4 0.054 71.1 0.049 62.3 0.043 53.8 12 .0003 0.075 100 0.069 90.4 0.063 81.0 0.058 72.1 0.052 63.5 0.046 55.3 13 .0003 0.078 100 0.072 90.7 0.067 81.6 0.061 73.0 0.056 64.8 0.050 56.8 14 .0004 O.OS2 100 0.076 91.0 0.071 82.3 0.065 73.9 0.059 65.9 0.054 58.2 .0004 15 0.086 100 0.080 91.3 0.074 82.9 0.069 74.8 0.063 67.1 0.057 59.7 16 .0004 0.090 100 0.084 91.6 0.078 83.4 0.073 75.7 0.067 68.2 0.061 61.0 17 .0004 0.094 100 0.088 91.9 0.083 84.0 0.077 76.5 0.071 69.2 0.066 62.3 18 .0004 0.098 100 0.093 92.1 0.087 84.5 0.081 77.2 0.076 70.2 0.070 63.5 19 .0005 0.103 100 0.097 92.4 0.092 85.0 0.086 78.0 O.OSO 71.2 0.075 64.7 .0005 20 0.108 100 0.102 92.6 0.096 85.5 0.091 78.7 0.085 72.1 0.079 65.8 21 .0005 0.113 100 0.107 92.9 0.101 86.0 0.096 79.4 0.090 73.0 0.084 66.9 22 .0005 0.118 100 0.112 93.1 0.107 86.4 0.101 80.0 0.095 73.8 0.089 68.0 23 .0005 0.123 100 0.118 93.3 0.112 86.8 0.106 80.7 0.100 74.6 0.095 68.9 24 .0006 0.129 100 0.123 93.6 0.117 87.2 0.112 81.2 0.106 75.4 0.100 69.9 25 .0006 0.135 100 0.129 93.8 0.123 87.6 0.118 81.8 0.112 76.1 0.106 70.7 ! .0006 26 0.141 100 0.135 94.0 0.129 88.0 0.123 82.4 0.117 76.8 0.112 71.6 27 .0006 0.147 100 0.141 94.1 0.136 88.3 0.130 82.9 0.124 77.5 0.118 72.5 28 .0006 0.153 100 0.148 94.3 0.142 88.7 0.136 83.4 0.130 78.2 0.125 73.3 29 .0007 0.160 100 0.154 94.5 0.149 89.0 0.143 83.9 0.137 78.8 0.131 74.0 30 .0007 0.167 100 0.161 94.7 0.155 89.3 0.150 84.3 0.144 79.4 0.138 74.8 j 31 .0007 0.174 100 0.168 94.8 0.162 89.6 0.157 84.8 0.151 80.0 0.145 75:6 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.0012. 51 PSYCHROMETRICAL TABLES. Temperature, Fahrenheit. — Force of Vapor in English Inches. — Relative Humidity in Hundredths. t — t', or Difference of Wet and Dry Bulb Thermometers. t', below the Freezing-Point ; the Bulb covered with a Film of Ice. Wet- Bulb Vertical Thermo- Difference 3°.O 3°»5 4°.O 4°«5 5°.O 5°.t> meter A; of Force Fahren- for each Rela- Rela- Rela- Rela- Rela- Rela- heit. o°.i. Force of Vapor. tive Hu- mid- Force of Vapor. tive Hu- mid- Force of Vapor. tive Hu- mid- Force of Vapor. tive Hu- midr Force of Vapor. tive Hu- mid- Force of Vapor. tive Hu- mid- ity. ity. ity. ity. ity. ity. o Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. 0 0.010 19.3 0.004 7.9 0.0002 1 0.012 22.3 0.006 11.3 .0002 2 0.014 25.3 0.008 14.7 3 .0002 0.016 28.1 0.010 17.8 .0002 4 0.018 30.8 0.013 20.9 0.007 11.4 .0002 5 0.021 33.4 0.015 23.8 0.010 14.6 6 .0002 0.023 35.6 0.018 26.3 0.012 17.5 0.006 9.0 7 .0002 0.026 37.7 0.020 28.8 0.014 20.2 0.009 12.0 8 .0003 0.028 39.8 0.023 31.2 0.017 22.9 0.011 15.0 9 .0003 0.031 41.8 0.026 33.5 0.020 25.5 0.014 17.9 0.009 10.6 .0003 10 0.034 43.8 0.029 35.7 0.023 28.0 0.017 20.6 0.012 13.6 11 .0003 0.037 45.7 0.032 37.9 0.026 30.4 0.020 23.3 0.014 16.4 0.009 9.9 12 .0003 0.041 47.5 0.035 40.0 0.029 32.7 0.024 25.8 0.018 19.2 0.012 12.9 13 .0003 0.044 49.2 0.039 42.0 0.033 35.0 0.027 28.3 0.022 21.9 0.016 15.8 14 .0004 0.048 50.9 0.042 43.9 0.037 37.1 0.031 30.7 0.025 24.5 0.020 18.5 .0004 15 0.052 52.5 0.046 45.7 0.040 39.2 0.035 32.9 0.029 26.9 0.023 21.2 16 .0004 0.056 54.1 0.050 47.5 0.044 41.2 0.039 35.1 0.033 29.3 0.027 23.7 17 .0004 0.060 55.6 0.054 49.2 0.049 43.1 0.043 37.2 0.037 31.6 0.032 26.2 18 .0004 0.065 57.0 0.059 50.9 0.053 44.9 0.047 39.2 0.042 33.7 0.036 28.5 19 .0004 0.069 58.4 0.063 52.5 0.058 46.7 0.052 41.2 0.046 35.8 0.040 30.7 .0005 29 0.074 59.8 0.068 54.0 0.062 48.3 0.057 43.0 0.050 37.8 0.045 32.9 21 .0005 0.079 61.0 0.073 55.4 0.067 50.0 0.062 44.7 0.056 39.7 0.050 34.9 22 .0005 0.084 62.2 0.078 56.8 0.072 51.5 0.067 46.4 0.061 41.5 0.055 36.8 23 .0005 0.089 63.4 0.083 58.1 0.078 52.9 0.072 48.0 0.066 43.3 0.061 38.6 24 .0006 0.095 64.4 0.089 59.3 0.083 54.3 0.077 49.6 0.072 44.9 0.066 40.5 25 .0006 0.100 65.5 0.095 60.5 0.089 55.6 O.OS3 51.0 0.078 46.5 0.072 42.2 ..0006 26 0.106 66.5 0.101 61.7 0.095 56.9 0.089 52.4 0.083 48.0 0.078 43.9 27 . -.0006 0.113 67.5 0.107 62.8 0.101 58.2 0.095 53.8 0.090 49.6 0.084 45.5 28 . .0006 0.119 68.5 0.113 63.9 0.108 59.4 0.102 55.2 0.096 51.0 0.090 47.0 29 .0007 0.126 69.4 0.120 64.9 0.114 60.6 0.108 56.4 0.103 52.4 0.097 48.5 30 .0007 0.132 70.3 0.127 65.9 0.121 61.7 0.115 57.7 0.109 53.7 0.104 49.9 31 .0007 0.139 71.2 0.134 66.9 0.128 62.8 0.122 58.8 0.116 55.0 0.111 51.2 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.0012. B PSYCHROMETRICAL TABLES. 4 Temperature, Fahrenheit. — Force of Vapor in English Inches. — Relative Humidity in Hundredths. t — t', or Difference of Wet and Dry Bulb Thermometers. Wet- Mean t', below the Freezing-Point ; the. Bulb covered with a Film of Ice. Bulb Vertical Thermo- Difference 6°.0 6°«5 T^.O "yo«t5 8°.O 8°«5 meter of Force f.j of Vapor Fahren- for each Rela- Rela- Rela- Rela- Rela- Rela- heit. 0-. Force of Vapor. tive Hu- mid- Force of Vapor. tive Hu- mid- Force of Vapor. tive Hu- mid- Force of Vapor. tive Hu- mid- Force of Vapor. tive Hu- mid- Force of Vapor. tive Hu- mid- ity. ity. ity. ity. ity. ity. o Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng In. 12 0.0003 0.007 6.8 13 .0004 0.010 9.9 14 .0004 0.014 12.8 0.008 7.5 15 .0004 0.018 15.7 0.012 10.4 0.006 5.4 16 0.022 18.4 0.016 13.3 0.010 8.4 .0004 17 0.026 21.0 0.020 16.0 0-015 11.3 0.009 6.7 .0004 18 .0005 0.030 23.5 0.025 18.6 0.019 14.0 0.013 9.6 0.008 5.3 19 0.035 25.8 0.029 21.2 0.023 16.6 0.018 12.3 0.012 8.2 0.006 4.2 .0005 20 .0005 0.040 28.1 0.034 23.5 0.028 19.0 0.022 15.0 0.017 11.0 0.011 7.1 21 0.044 30.3 0.039 25.8 0.033 21.5 0.027 17.5 0.022 13.5 0.016 9.8 .0005 22 0.050 32.3 0.044 28.0 0.038 23.8 0.032 19.8 0.027 16.0 0.021 12.3 23 .0005 0.055 34.2 0.049 30.1 0.043 26.0 0.038 22.1 0.032 18.4 0.026 14.8 24 .0005 0.060 36.1 0.055 32.1 0.049 28.1 0.043 24.4 0.038 20.7 0.032 17.2 25 .0006 0.066 38.0 0.060 34.0 0.055 30.2 0.049 26.5 0.043 23.0 6.038 19.5 26 .0006 0.072 39.8 0.066 35.9 0.061 32.2 0.055 28.6 0.049 25.1 0.043 21.8 .0006 27 0.078 41.5 0.073 37.8 0.067 34.0 0.061 30.6 0.055 27.2 0.050 23.9 28 .0006 0.085 43.2 0.079 39.5 0.073 35.9 0.067 32.5 0.062 29.1 0.056 25.9 29 .0007 0.091 44.8 0.085 41.1 0.080 37.6 0.074 34.2 0.068 31.0 0.063 27.9 30 .0007 0.098 46.2 0.092 42.7 0.086 39.2 0.081 35.9 0.075 32.8 0.069 29.7 31 .0007 0.105 47.6 0.099 44.2 0.093 40-8 0.088 37.5 0.082 34.4 0.076 31.4 9°.O 9°.5 100.0 10°.5 »c.O H°.5 Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. 20 0.005 3.4 21 0.0005 0.010 6.1 0.005 2.7 22 .OOC5 0.015 8.8 0.010 5.4 0.004 2.2 23 .0005 0.021 11.4 0.015 8.0 0.009 4.9 24 .0005 0.026 13.9 0.020 10.6 0.015 7.5 0.009 4.5 25 .0006 0.032 16.2 0.026 13.1 0.020 10.0 0.015 7.1 0.009 4.2 .0006 26 0.038 18.5 0.032 15,4 0.026 12.4 0.021 9.5 0.015 6.8 0.009 4.1 27 .0006 0.014 20.7 0.038 17.7 0.032 14.7 0.027 11.9 0.021 9.2 0.015 6.5 28 .0006 0.050 22.8 0.045 19.9 0.039 16.9 0.033 14.2 0.027 11.5 0.022 8.9 29 .0007 0.057 24.9 0.051 21.9 0.045 19.0 0.040 16.3 0.034 13.7 0.028 11.1 30 .0007 0.064 26.7 0.058 23.8 0.052 21.0 0.046 18.4 0.041 15.8 0.035 13.3 31 .0007 0.071 28.5 0.065 25.7 0.059 22.9 0.053 20.3 0.048 17.8 0.042 15.3 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.0012. B 53 PSYCHROMETRICAL TABLES. Temperature, Fahrenheit — Force of Vapor in English Inches. — Relative Humidity in Hundredths. t — t1, or Difference of Wet and Dry Bulb Thermometers. Wet- Bulb Thermo- Mean Vertical Difference o°.o 0°.5 1°.0 1°.5 2°.O 2°.5 meter of Force t' Fahren- of Vapor for each Rela- Rela- Rela- Rela- Rela- Rela- heit. 00.1. Force of tive Hu- Force of tive Hu- Force of tive Hu- Force of tive Hu- Force of tive Hu- Force of tive Hu- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- ity. ity. ity. ity. ity. ity. 0 Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. 32 0.0007 0.181 100 0.175 94.5 0.168 89.3 0.162 84.1 0.155 79.2 0.149 74.4 33 .0008 0.188 100 0.182 94.7 0.175 89.5 0.169 84.5 0.162 79.7 0.156 75.0 34 .0008 0.196 100 0.189 94.8 0.183 89.8 0.176 84.9 0.170 80.2 0.163 75.6 35 .0008 0.204 100 0.197 94.9 0.191 90.0 0.184 85.3 0.178 80.7 0.171 76.2 36 0.212 100 0.205 95.0 0.199 90.3 0.192 85.6 0.186 81.1 0.179 76.8 .0009 37 0.220 100 0.214 95.2 0.207 90.5 0.201 86.0 0.194 81.6 0.188 77.3 .0009 38 .0009 0.229 100 0.223 95.3 0.216 90.7 0.210 86.3 0.203 82.0 0.196 77.9 39 0.238 100 0.232 95.4 0.225 91.0 0.219 86.6 0.212 82.4 0.206 78.4 .0009 40 .0010 0.248 100 0.241 95.5 0.235 91.2 0.228 86.9 0.221 82.9 0.215 78.9 41 0.257 100 0.251 95.6 0.244 91,4 0.238 87.3 0.231 83.3 0.224 79.4 .0010 42 0.267 100 0.260 95.7 0.254 91.6 0.247 87.5 0.241 83.6 0.234 79.8 43 .0010 0.278 100 0.271 95.8 0.264 91.8 0.258 87.8 0.251 84.0 0.245 80.3 44 .0011 0.288 100 0.282 95.9 0.275 92.0 0.268 88.1 0.262 84.3 0.255 80.7 45 .0011 0.299 100 0.293 96.0 0.286 92.1 0.280 88.3 0.273 84.7 0.266 8M 46 .0011 0.311 100 0.304 96.1 0.297 92.3 0.291 88.6 0.284 85.0 0.278 81.5 .0012 47 0.323 100 0.316 96.2 0.310 92.5 0.303 88.8 0.297 85.3 0.290 81.9 48 .0012 0.335 100 0.329 96.2 0.322 92.6 0.315 89.0 0.309 85.6 0.302 82.2 49 .0013 0.348 100 0.341 96.3 0.335 92.7 0.328 89.3 0.321 85.9 0.315 82.6 50 .00)3 0.361 100 0.354 96.4 0.348 92.9 0.341 89.5 0.334 86.1 0.328 82.9 51 .0013 0.374 100 0.368 96.5 0.361 93.0 0.354 89.7 0.348 86.4 0.341 83.2 .0014 52 0.388 100 0.382 96.5 0.375 93.2 0.368 89.9 0.362 86.7 0.355 83.6 53 .0014 0.403 100 0.396 96.6 0.389 93.3 0.383 90.1 0.376 86.9 0.370 83.9 54 .0015 0.418 100 0.411 96.7 0.404 93.4 0.398 90.2 0.391 87.2 0.385 84.2 55 .0015 0.433 100 0.426 96.7 0.420 93.5 0.413 90.4 0.407 87.4 0.400 84.4 56 .0016 0.449 100 0.442 96.8 0.436 93.6 0.429 90.6 0.422 87.6 0.416 84.7 .0016 57 0.466 100 0.459 96.8 0.452 93.7 0.446 90.7 0.439 87.8 0.432 85.0 58 .0017 0.482 100 0.476 96.9 0.469 93.9 0.463 90.9 0.456 88.0 0.449 85.2 •' 59 .0017 0.500 100 0.493 96.9 0.487 94.0 0.480 91.0 0.473 88.2 0.467 85.5 60 .0018 0.518 100 0.511 97.0 0.505 94.1 0.498 91.2 0.491 88.4 0.485 85.7 61 .0019 0.537 100 0.530 97.0 0.523 94.2 0.517 91.3 0.510 88.6 0.503 85.9 ' .0019 62 0.556 100 0.549 97.1 0.542 94.2 0.536 91.5 0.529 88.8 0.522 86.2 63 .0020 0.576 100 0.569 97.1 0.562 94.3 0.556 91.6 0.549 89.0 0.542 86.4 64 .00-20 0.596 100 0.589 97.2 0.583 94.4 0.576 91.7 0.569 89.1 0.563 86.6 65 .0021 0.617 100 0.611 97.2 0.604 94.5 0.597 91.9 0.591 89.3 0.584 86-8 66 .0022 0.639 100 0.633 97.3 0.626 94.6 0.619 92.0 0.612 89.5 0-606 87.0 67 .0023 0.662 100 0.655 97.3 0.648 94.7 0.642 92.1 0.635 89.6 0-628 87.2 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.0013. B 54 PSYCHHOMETRICAL TABLES. Temperature, Fahrenheit. — Force of Vapor in English Inches —Relative Humidity in Hundredthfl. IVct- Moan t — t'} or Difference of Wet and Dry Bulb Thermometers. Bulb Thermo- Vertical Difference o°.o 0°.5 1°.0 1°.5 2°.0 2°.5 ! meter of Force f of Vapor Fahren- for each Rela- Rela- Rela- Rela. Rela- JRela- heit. 0°.l. tive tive tive tive tive t.iv« Force of Hu- Force of Hu- Force of Hu- Force o; Hu- Force of Hu- Hu- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- ity. ity. ity. ity. ity. ity. o Eng. In. Eng. In. Eng. In. Eng. In Eng. In Eng In 68 0.00-23 0.685 100 0.678 97.3 0.671 94.7 0.665 92.2 0.658 89.8 0.651 87.3 69 .0024 0.708 100 0.702 97.4 0.695 94.8 0.688 92.3 0.682 89.9 0.675 87.5 70 .0025 0.733 100 0.726 97.4 0.720 94.9 0.713 92.4 0.706 90.0 0.699 87.7 71 .0026 0.758 100 0.752 97.5 0.745 95.0 0.738 92.5 0.731 90.2 0.725 87.9 72 0.784 100 0.778 97.5 0.771 95.0 0.764 92.7 0.757 90.3 0.751 88.0 .0027 73 .0028 0.811 100 0.805 97.5 0.798 95.1 0.791 92.7 0.784 90.4 0.778 88.2 74 .0028 0.839 100 0.832 97.6 0.826 95.2 O.S19 92.8 0.812 90.6 0.805 88.3 75 .0029 0.868 100 0.861 97.6 0.854 95.2 0.847 92.9 0.841 90.7 0.834 88.5 76 .0030 0.897 100 0.890 97.6 0.883 95.3 0.877 '93.0 0.870 90.8 0.863 88.6 77 0.927 100 0.920 97.7 0.914 95.4 0.907 93.1 0.900 90.9 0.893 88.8 .0031 78 .0032 0.958 100 0.951 97.7 0.945 95.4 0.938 93.2 0.931 91.0 0.921 88.9 79 .0033 0.990 100 0.983 97.7 0.977 95.5 0.970 93.3 0.963 91.1 0.956 89.0 80 .0034 1.023 100 1.016 97.7 1.010 95.5 1.003 93.4 0.996 91.2 0.989 89.2 81 .0035 1.057 100 1.050 97.8 1.044 95.6 1.037 93.4 .1.030 91.3 1.023 89.3 82 1.092 100 1.085 97.8 1.079 95.6 1.072 93.5 1.065 91.4 1.058 89.4 .0036 83 1.128 100 1.121 97.8 1.115 95.7 1.108 93.6 1.101 91.5 1.094 89.5 .0037 84 1.165 100 1.158 97.8 1.152 95.7 1.145 93.6 1.138 91.6 1.131 89.6 85 .0038 HAQO 1.203 100 1.196 97.9 1.189 95.8 1.183 93.7 1.176 91.7 1.169 89.7 86 • UUoi) 1.242 100 1.235 97.9 1.228 95.8 1.222 93.8 1.215 91.8 1.208 89.8 .0040 87 1.282 100 1.275 97.9 1.268 95.9 1.263 93.8 1.256 91.9 1.249 90.0 .0041 88 1.323 100 1.317 97.9 1.310 95.9 1.303 93.9 1.296 92.0 1.289 90.1 89 .0042 1.366 100 1.359 97.9 1.352 95.9 1.345 94.0 1.339 92.0 1.332 90.2 90 .0044 1.410 100 1.403 98.0 1.396 96.0 1.389 94.0 1.382 92.1 1.375 90.3 91 .0045 1.455 100 1.448 98.0 1.441 96.0 1.434 94.1 1.427 92.2 1.420 90.3 92 .0046 1.501 100 1.494 98.0 1.487 96.1 1.480 94.1 1.473 92.3 1.466 90.4 .0048 93 1.548 100 1.541 98.0 1.535 96.1 1.528 94.2 1.521 92.4 1.514 90.5 94 .0049 1.597 100 1.590 98. 1.583 96.1 1.576 94.3 1.569 92.4 1.562 90.6 95 .0050 1.647 100 1.640 98. 1.633 96.2 1.626 94.3 1.619 92.5 1.612 90.7 96 .0051 1.698 100 1.691 98. 1.684 96.2 1.677 94.4 1.670 92.6 1.664 90.8 97 .0053 1.751 100 1.744 98. 1.739 96.2 1.730 94.4 1.723 92.6 1.716 90.9 98 .0054 1.805 100 1.798 98. 1.791 96.3 1.784 94.5 1.777 92.7 1.770 90.9 .0056 99 1.861 100 1.854 98.1 1.847 96.3 1.840 94.5 1.833 92.8 1.826 91.0 100 .0057 1.918 100 1.911 98.2 1.904 96.3 1.897 94.6 1.890 92.8 1.883 91.1 101 .0059 1.977 100 1.970 98.2 1.963 96.4 1.936 94.6 1.949 92.9 1.942 91.2 102 .0060 2.037 100 2.030 98.2 2.023 96.4 2.016 94.7 2.009 92.9 2.002 91.2 103 .0062 2.098 100 2.092 98.2 2.085 96.4 2.078 94.7 2.071 93.0 2.064 91.3 104 .0063 2.162 100 2.155 98.2 2.148 96-5 2.141 94.7 2.134 93.1 2.127 91.4 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.0013. B 55 PSYCHROMETRICAL TABLES. Temperature, Fahrenheit. — Force of Vapor in English Inches. — Relative Humidity in Hundredths. TTr_A t — t', or Difference of Wet and Dry Bulb Thermometers. Wet- Bulb Thermo- Vertical Difference 3°.O 3°.5 4°.0 4°.5 5°.O 5°. 5 meter +i of Force t-\f Va rtm* Fahren- 01 v apor for each Rela- Rela- Rela- Rela- Rela Rela- heit. 0°.l. force of tive Hu- force of tive Hu- Force of tive Hu- Force of tive Hu- Force of tive Hu force of tive Hu- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- ity ity. ity. ity. ity. ity. o Eng. In. Eng. In. 3ng. In. Eng. In. Eng. In. Eng. In. 32 0.142 69.8 0.136 65.3 0.129 61.0 0.123 56.8 0.116 52.7 0.110 48.8 33 0.0007 0.149 70.5 0.143 66.1 0.136 61.9 0.130 57.7 0.123 53.7 0.117 50.0 34 .0007 0.157 71.2 0.150 66.9 0.144 62.8 0.137 58.6 0.131 54.7 0.124 51.2 .0008 35 0.165 71.9 0.158 67.7 0.152 63.6 0.145 59.5 0.139 55.7 0.132 52.3 36 .0008 0.173 72.6 0.166 68.5 0.160 64.5 0.153 60.5 0.147 56.7 0.140 53.4 .0008 37 0.181 73.2 0.175 69.2 0.168 65.3 0.162 61.4 0.155 57.7 0.149 54.5 .0009 38 0.190 73.8 0.183 69.9 0.177 66.1 0.170 62.3 0.164 58.7 0.157 55.5 39 .0009 0.199 74.4 0.192 70.6 0.186 66.9 0.179 63.2 0.173 59.7 0.166 56.5 .0010 40 0.208 75.0 0.202 71.3 0.195 67.7 0.189 64.1 0.182 60.7 0.176 57.5 41 .0010 0.218 75.6 0.211 72.0 0.205 68.4 0.198 65.0 0.192 61.7 0.185 58.5 .0010 42 0.22S 76.2 0.221 72.6 0.215 69.1 0.208 65.7 0.202 62.4 0.195 59.4 43 .0010 0.238 76.7 0.232 73.2 0.225 69.8 0.219 66.3 0.212 63.1 0.205 60.2 44 .0011 0.249 77.2 0.242 73.7 0.236 70.4 0.229 67.0 0.223 63.8 0.216 61.1 45 .0011 0.260 77.7 0.253 74.3 0.247 71.0 0.240 67.6 0.234 64.6 0.227 61.8 46 .0011 0.271 78.1 0.265 74.8 0.258 71.6 0.252 68.3 0.245 65.3 0.238 62.6 .0012 47 0.283 78.6 0.277 75.3 0.270 72.2 0.264 68.9 0.257 66.0 0.250 63.3 48 .001-2 0.296 79.0 0.289 75.8 0.282 72.7 0.276 69.6 0.269 66.7 0.263 64.0 49 .0013 0.308 79.4 0.302 76.3 0.295 73.3 0.288 70.2 0.282 67.4 0.275 64.7 50 .0013 0.321 79.8 0.315 76.7 0.308 73.8 0.301 70.9 0.295 68.1 0.288 65.4 51 .0013 0.335 80.2 0.328 77.2 0.321 74.3 0.315 71.4 0.308 68.7 0.302 66.0 .0014 52 0.349 80.5 0.342 77.6 0.335 74.7 0.329 71.9 0.322 69.2 0.315 66.6 53 .0014 0.363 80.9 0.356 78.0 0.350 75.2 0.343 72.5 0.336 69.8 0.330 67.2 54 .0015 0.378 81.2 0.371 78.4 0.365 75.6 0.358 72.9 0.351 70.3 0.345 67.8 55 .0015 0.393 81.6 0.387 78.8 0.380 76.1 0.373 73.4 0.367 70.8 0.360 68.3 56 .0016 0.409 81.9 0.403 79.1 0.396 76.5 0.389 73.9 0.383 71.3 0.376 68.9 .0016 57 0.426 82.2 0.419 79.5 0.412 76.9 0.406 74.3 0.399 71.8 0.392 69.4 58 .0017 0.443 82.5 0.436 79.8 0.429 77.2 0.423 74.8 0.416 72.3 0.409 69.9 59 .00 n 0.460 82.8 0.453 80.2 0.447 77.6 0.440 75.1 0.433 72.7 0.427 70.3 60 .0018 0.478 83.1 0.471 80.5 0.465 78.0 0.458 75.5 0.451 73.1 0.445 70.8 61 .0019 0.497 83.3 0.490 80.8 0.483 78.3 0.477 75.9 0.470 73.5 0.463 71.3 .0019 62 0.516 83.6 0.509 81.1 0.502 78.6 0.496 76.3 0.489 74.0 0.482 71.7 63 .0020 0.536 83.8 0.529 81.4 0.522 79.0 0.516 76.6 0.509 74.3 0.502 72.1 64 .00-20 0.556 84.1 0.549 81.7 0.543 79.3 0.536 77.0 0.529 74.7 0.523 72.5 65 .0021 0.577 84.3 0.570 81.9 0.564 79.6 0.557 77.3 0.550 75.1 0.544 72.9 66 .002-2 0.599 84.6 0.592 82.2 0.586 79.9 0.579 77.6 0.572 75.4 0.566 73.3 67 .0033 0.622 84.8 0.615 82.4 0.608 80.2 0.601 78.0 0.595 75.8 0.588 73.7 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.0013. 56 PSYCHROMETRI JAL TABLES. Temperature, Fahrenheit. — Force of Vapor in English Inches. — Relative Humidity in Hundredths. 8 t — t', or Difference of Wet and Dry Bulb Thermometers. 6t- Bulb Thermo- Vertical Difference 3°.O 3°.i5 4°.O 4°.5 5°.O 5°.5 meter of Force Fahren- for each Rela- Rela- Rela- Rela- Rela Rela- heit 0° 1 tive tive ! tive tive tive tive Force of Hu- Force of Hu- Force of HII- Force of Hu- Force of Hu- Force of Hu- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- ity. ity. ity. ity. ity. ity. o Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. 68 0.644 85.0 0.638 82.7 0.631 80.4 0.624 78.3 0.618 76.1 0.611 74.0 0.0024 69 0.668 85.2 0.661 82.9 0.655 80.7 0.648 78.6 0.641 76.4 0.635 74.4 .0024 70 0.693 85.4 0.686 83.2 0.679 81.0 0.672 78.8 0.666 76.8 0.659 74.7 .0025 71 0.718 85.6 0.711 83.4 0.704 81.2 0.698 79.1 0.691 77.1 0.684 75.1 .0026 72 0.744 85.8 0.737 83.6 0.731 81.5 0.724 79.4 0.718 77.4 0.710 75.4 .0027 73 0.771 86.0 0.764 83.8 0.757 81.7 0.751 79.7 0.744 77.6 0.737 75.7 74 .0028 0.799 86.2 0.792 84.0 0.785 81.9 0.778 79.9 0.772 77.9 0.765 76.0 .0028 75 0.827 86.3 0.820 84.2 0.814 82.2 0.807 80.2 0.800 78.2 0.793 76.3 76 .0029 0.856 86.5 0.850 84.4 0.843 82.4 0.836 80.4 0.829 78.4 0.823 76.6 77 .0030 0.887 86.7 0.880 84.6 0.873 82.6 0.866 80.6 0.860 78.7 0.853 76.8 .0031 78 0.918 86.8 0.911 84.8 0.904 82.8 0.897 80.8 0.890 78.9 0.884 77.1 79 .0032 0.949 87.0 0.943 85.0 0.936 83.0 0.929 81.1 0.922 79.2 0.916 77.4 80 .0033 0.982 87.1 0.976 85.1 0.969 83.2 0.962 81.3 0.955 79.4 0.949 77.6 81 .0034 1.016 87.3 1.010 85.3 1.003 83.4 0.996 81.5 0.989 79.7 0.982 77.9 82 .0035 1.051 87.4 1.045 85.5 1.038 83.6 1.031 81.7 1.024 79.9 1.017 78.1 .0036 83 1.0S7 87.5 1.030 85.6 1.074 83.7 1.067 81.9 1.060 80.1 1.053 78.3 84 .0037 1.124 87.7 1.117 85.8 1.111 83.9 1.104 82.1 1.096 80.3 1.090 78.5 85 .0038 1.162 87.8 1.155 85.9 1.148 84.1 1.142 82.3 1.135 80.5 1.128 78.8 86 .0039 1.201 87.9 1.194 86.1 1.187 84.2 1.181 82.4 1.174 80.7 1.167 79.0 87 .0040 1.242 88.1 1.235 86.2 1.228 84.4 1.222 82.6 1.215 80.9 1.208 79.2 .0041 88 1.282 88.2 1.276 86.3 1.269 84.6 1.262 82.8 1.255 81.1 1.248 79.4 89 .0042 1.325 88.3 1.318 86.5 1.311 84.7 1.304 83.0 1.297 81.3 1.291 79.6 90 .0044 1.369 88.4 1.362 86.6 1.355 84.9 1.348 83.1 1.341 81.4 1.334 79.8 91 .0045 1.413 88.5 1.407 86.7 1.400 85.0 1.393 83.3 1.386 81.6 1.379 80.0 92 .0046 1.460 88.6 1.453 86.9 1.446 85.1 1.439 83.4 1.432 81.8 1.425 80.2 .0047 93 1.507 88.7 1.500 87.0 1.493 85.3 1.486 83.6 1.480 82.0 1.473 80.3 94 .0049 1.556 88.8 1.549 87.1 1.542 85.4 1.535 83.8 1.528 82.1 1.521 80.5 95 .0050 1.606 88.9 1.599 87.2 1.592 85.5 1.585 83.9 1.578 82.3 1.571 80.7 98 .0051 1.657 89.0 1.650 87.3 1.643 85.7 1.636 84.0 1.629 82.4 1.622 80.9 97 .0052 1.709 89.1 1.702 87.5 1.696 85.8 1.688 84.2 1.682 82.6 1.675 81.0 98 .0054 1.764 89.2 1.757 87.6 1.750 85.9 1.743 84.3 1.736 82.7 1.729 81.2 .0055 99 1.819 89.3 1.812 87.7 1.805 86.0 1.798 84.4 1.792 82.9 1.785 81.3 100 .0057 1.876 89.4 1.869 87.8 1.863 86.2 1.856 84.6 1.849 83.0 1.842 81.5 101 .0058 1.935 89.5 1.928 87.9 1.921 86.3 1.914 84.7 1.907 83.2 1.900 81.6 102 .0060 1.995 89.6 1.988 88.0 1.981 86.4 1.974 84.8 1.967 83.3 1.961 81.8 103 .0062 2.057 89.7 2.050 83.1 2.043 86. 5 2.036 84.9 2.029 83.4 2.022 81.9 104 .0063 2.120 89.8 2.113 88.2 2.106 86.6 2.099 85.1 2.092 83.5 2.085 82.1 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.0013. B 57 9 PSYCHROMETRICAL TABLES. Temperature, Fahrenheit — Force of Vapor in English Inches. — Relative Humidity in Hundredths TTA* t — t', or Difference of Wet and Dry Bulb Thermometers. f V 6t- Bulb Thermo- Mean Vertical Difference 6°.O 6°.5 7°.O 7°.5 8°.0 8°.5 meter f of Force )f Vapor ?ahren- for each Rela- Rela Rela- JRela- Rela- JRela- heit. 0°.l. Force of tive Hu- Force of tive Hu- Force of tive Hu- tive Hu- Force of tive Hu- tive Hu- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- ity. ity. ity ity. ity. ity. o Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. 32 0.103 45.0 0.097 41.4 0.090 37.9 0.084 34.5 0.077 31.2 0.071 28.0 33 0.0007 0.110 46.3 0.104 42.7 0.097 39.3 0.091 36.0 0.084 32.8 0.078 29.6 34 .0007 0.118 47.6 0.111 44.1 0.105 40.7 0.098 37.4 0.092 34.3 0.085 31.2 35 .0008 0.126 48.8 0.119 45.3 0.113 42.0 0.106 38.8 0.100 35.7 0.093 32.8 36 .0008 0.134 50.0 0.127 46.6 0.121 43.3 0.114 40-2 0.108 37.2 0.101 34.3 .0009 37 0.142 51.1 0.136 47.8 0.129 44.6 0.123 41.6 0.116 38.6 0.109 35.7 38 .0009 0.151 52.2 0.144 49.0 0.138 45.9 0.131 42.9 0.125 40.0 0.118 37.2 39 .0009 0.160 53.3 0.153 50.1 0.147 47.1 0.140 44.1 0.134 41.3 0.127 38.5 40 .0009 0.169 54.3 0.163 51.3 0.156 48.3 0.149 45.4 0.143 42.6 0.136 39.9 41 .0010 0.179 55.4 0.172 52.3 0.166 49.4 0.159 46.6 0.153 43.9 0.146 41.2 .0010 42 0.189 56.3 0.182 53.4 0.175 50.5 0.169 47.7 0.162 45.0 0.156 42.4 43 .0010 0.199 57.2 0.192 54.3 0.186 51.5 0.179 48.8 0.173 46.1 0.166 43.6 44 .0011 0.209 58.1 0.203 55.3 0.196 52.5 0.190 49.8 0.183 47.2 0.177 44.7 45 .0011 0.220 59.0 0.214 56.2 0.207 53.5 0.201 50.8 0.194 48.3 0.188 45.8 46 .0011 0.232 59.8 0.225 57.0 0.219 54.4 0.212 51.8 0.206 49.3 0.198 46.9 .0012 47 0.244 60.6 0.237 57.9 0.231 55.2 0.224 52.7 0.217 50.2 0.211 47.9 48 .0012 0.256 61-3 0.249 58.7 0.243 56.1 0.236 53.6 0.230 51.2 0.223 48.8 49 .0013 0.269 62.0 0.262 59.4 0.255 56.9 0.249 54.5 0.242 52.1 0.236 49.7 50 .0013 0.2S2 62.7 0.275 60.2 0.268 57.7 0.262 55.3 0.255 52.9 0.249 50.6 51 .0013 0.295 63.4 0.288 60.9 0.282 58.4 0.275 56.1 0.269 53.7 0.262 51.5 .0014 52 0.309 64.1 0.302 61.6 0.296 59.2 0.289 56.8 0.282 54.6 0.276 52.3 53 .0014 0.323 64.7 0.317 62.3 0.310 59.9 0.303 57.6 0.297 55.3 0.290 53.2 54 .0015 0.338 65.3 0-332 62.9 0.325 60.6 0.318 58.3 0.312 56.1 0.305 53.9 55 .0015 0.354 65.9 0.347 63.5 0.340 61.2 0.334 59.0 0.327 56.8 0.320 54.9 56 .0016 0.369 66.5 0.363 64.1 0.356 61.9 0.349 59.7 0.343 57.5 0.336 55.4 .0017 57 0.386 67.0 0.379 64.7 0.373 62.5 0.366 60.3 0.359 58.2 0.353 56.1 58 .0017 0.403 67.5 0.396 65.3 0.389 63.1 0.383 60.9 0.376 58.8 0.369 56.8 59 .0017 0.420 68.0 0.413 65.8 0.407 63.6 0.400 61.5 0.393 59.5 0.387 57.5 60 .0018 0.438 68.5 0.431 66.3 0.425 64.2 0.418 62.1 0.411 60.1 0.405 58.1 61 .0018 0.457 69.0 0.450 66.9 0.443 64.7 0.436 62.7 0.430 60.7 0.423 58.7 .0019 62 0.476 69.5 0.469 67.4 0.462 65.3 0.456 63.2 0.449 61.3 0.442 59.3 63 .0020 0.495 70.0 0.489 67.8 0.482 65.8 0.475 63.8 0.469 61.8 0.462 59.9 64 .0021 0.516 70.4 0.509 68.3 0.503 66.3 0.496 64.3 0.489 62.4 0.4S3 60.5 65 .0021 0.537 70.8 0.530 68.8 0.524 66.8 0.517 64.8 0.510 62.9 0.504 61.0 66 .0022 0.559 71.2 0.552 69.2 0.545 67.2 0.539 65.3 0.532 63.4 0.525 61.6 67 .0023 0.581 71.6 0.575 69.6 0.568 67.7 0.561 65.7 0.554 63.9 0.549 62.1 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.0013. B 58 PSYCHROMETRICAL TABLES. 10 Temperature, Fahrenheit. — Force of Vapor in English Inches —Relative Humidity in Hundredths. t — 1;, or Difference of Wet and Dry Bulb Thermometers. Wet- Bulb Thermo- Mean Vertical )ifference 6°.0 6°.5 7°.0 7°.5 8°.0 8°.5 meter 4-f of Force Fahren- for each Rela- Rela- Rela- Rela- Rela- Rela- j heit. 0°.l. tive tive tive tive tive tive Force of Vapor. Hu- mid- Force of Vapor. Hu- mid- Force of Vapor. Hu- mid- Force of Vapor. Hu- mid- Force of Vapor. Hu- mid- Force o) Vapor. Hu- mid- ity. ity. ity. ity. ity ity. o Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng In.j 68 0.0024 0.604 72.0 0.597 70.0 0.591 68.1 0.584 66.2 0.577 64.4 0.571 62.6 69 .0024 0.628 72.4 0.621 70.4 0.614 68.5 0.608 66.6 0.601 64.8 0.594 63.0 70 .0025 0.652 72.7 0.646 70.8 0.639 68.9 0.632 67.1 0.625 65.3 0.619 63.5 71 .00-26 0.678 73.1 0.671 71.2 0.664 69.3 0.657 67.5 0.651 65.7 0.644 64.0 72 0.704 73.4 0.697 71.5 0.690 69.7 0.683 67.9 0.677 66.1 0.670 64.4 .00-27 73 .0028 0.730 73.8 0.724 71.9 0.717 70.1 0.710 68.3 0.703 66.5 0.697 64.8 74 .0029 0.758 74.1 0.751 72.2 0.745 70.4 0.738 68.7 0.731 66.9 0.724 65.3 75 .0030 0.787 74.4 0.780 72.6 0.773 70.8 0.766 69.0 0.760 67.3 0.753 65.7 76 .0030 0.816 74.7 0.809 72.9 0.802 71.1 0.796 69.4 0.789 67.7 0.782 66.1 77 0.846 75.0 0.839 73.2 0.832 71.4 0.826 69.7 0.819 68.1 0.812 66.4 .0031 78 .0032 0.877 75.3 0.870 73.5 0.863 71.8 0.857 70.1 0.850 68.4 0.843 66.8 79 0.909 75.6 0.902 73.8 0.895 72.1 0.888 70.4 0.882 68.8 0.875 67.2 80 .0033 0.942 75.8 0.935 74.1 0.928 72.4 0.921 70.7 0.915 69.1 0.908 67.5 81 .0034 .0035 0.976 76.1 0.969 74.4 0.962 72.7 0.955 71.0 0.948 69.4 0.942 67.9 82 1.011 76.4 1.004 74.6 0.997 73.0 0.990 71.3 0.983 69.8 0.977 68.2 .0036 83 1.046 76.6 1.040 74.9 1.033 73.3 1.026 71.6 1.019 70.1 1.012 68.5 84 .0037 1.083 76.8 1.077 75.2 1.070 73.5 1.063 71.9 1.056 70.4 1.049 68.8 85 .0038 1.121 77.1 1.114 75.4 1.108 73.8 1.101 72.2 1.094 70.7 1.087 69.1 86 .0038 1.160 77.3 1.153 75.7 1.147 74.1 1.140 72.5 1.133 70.9 1.126 69.4 87 • 0039 1.201 77.5 1.194 75.9 1.187 74.3 1.181 72.7 1.174 71.2 1.167 69.7 .0040 88 1.241 77.7 1.235 76.1 1.228 74.6 1.221 73.0 1.214 71.5 1.207 70.0 89 .0042 1.284 78.0 .277 76.4 1.270 74.8 1.263 73.3 1.256 71.8 1.250 70.3 90 .0044 1.327 78.2 .321 76.6 1.314 75.0 1.307 73.5 1.300 72.0 1.293 70.6 91 .0045 1.372 78.4 .365 76.8 1.359 75.3 1.352 73.7 1.345 72.3 1.338 70.8 92 .0046 1.418 78.6 .412 77.0 1.405 75.5 1.398 74.0 1.391 72.5 1.384 71.1 .0047 93 1.466 78.8 .459 77.2 1.452 75.7 1.445 74.2 1.438 72.8 1.431 71.3 94 .0049 1.514 79.0 .507 77.4 1.501 75.9 1.494 74.4 1.487 73.0 1.480 71.6 95 .0050 1.564 79.1 .557 77.6 1.550 76.1 1.544 74.7 1.537 73.2 1.530 71.8 96 .0051 1.615 79.3 .608 77.8 1.602 76.3 1.595 74.9 1.588 73.4 1.581 72.1 97 .0052 1.668 79.5 .661 78.0 1.654 76.5 1.647 75.1 1.640 73.7 1.633 72.3 98 .0054 1.722 79.7 .715 78.2 1.708 76.7 1.701 75.3 1.694 73.9 1.688 72.5 .0056 99 1.778 79.8 .771 78.4 1.764 76.9 1.757 75.5 1.750 74.1 1.743 72.7 100 .0057 1.835 80.0 .828 78.5 1.821 77.1 1.814 75.7 1.807 74.3 1.800 72.9 101 .0059 1.893 80.2 1.887 78.7 1.880 77.3 1.873 75.9 1.866 74.5 1.859 73.2 102 .0060 1.954 80.3 .947 78.9 1.940 77.4 1.933 76.1 1.926 74.7 1.919 73.4 103 .0061 2.015 80.5 2.008 79.0 2.001 77.6 1.994 76.2 1,987 74.9 1.980 73.6 104 .0063 2.078 80.6 2.071 79.2 2.064 77.8 2.057 76.4 2.051 75.1 2.044 73.8 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.0013. B 59 11 PSYCHROMETRICAL TABLES. Temperature, Fahrenheit. — Force of Vapor in English Inches. —Relative Humidity in Hundredths. Wet- Mean t — t', or Difference of Wet and Dry Bulb Thermometers. Bulb Thermo- Vertical Difference 9°.O »o.5 10°.0 10°.5 11°.0 11°.5 meter of Force t of Vapor Fahren- for each Rela- Rela- Rela- Rela- Rela- Rela- heit. 0°JL tive tive tive tive tive tive ?orce of Hu- Force of Hu- Force of Hu- Force of Hu- Force of Hu- Force of Hu- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- ity. ity. ity. ity. ity. ity. 0 Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In 32 0 0007 0.064 25.0 0.058 22.0 0.051 19.2 0.045 16.4 0.038 13.8 0.032 11.2 33 0.071 26.7 0.065 23.8 0.058 21.0 0.052 18.3 0.045 15.7 0.039 13.2 34 .0007 .0008 0.079 28.3 0.072 25.5 0.066 22.7 0.059 20.1 0.053 17.5 0.046 15.1 35 0.087 29.9 0.080 27.1 0.074 24.4 0.067 21.8 0.061 19.3 0.054 16.9 36 0.095 31.4 0.088 28.7 0.082 26.0 0.075 23.5 0.069 21.1 0.062 18.7 .0003 37 0.103 33.0 0.096 30.3 0.090 27.6 0.083 25.2 0.077 22.8 0.070 20.4 38 .0009 0.112 34.4 0.105 31.8 0.099 29.2 0.092 26.8 0.086 24.4 0.079 22.1 39 .0009 0.121 35.9 0.114 33.3 0.108 30.7 0.101 28.4 0.094 26.1 0.088 23.8 40 .0009 0.130 37.3 0.123 34.8 0.117 32.2 0.110 29.9 0.104 27.6 0.097 25.4 41 .0010 0.139 38.6 0.133 36.2 0.126 33.7 0.120 31.4 0.113 29.2 0.107 27.0 .0010 42 0.149 39.9 0.143 37.5 0.136 35.0 0.130 32.8 0.123 30.6 0.116 28.4 43 .0010 0.160 41.1 0.153 38.7 0.146 36.3 0.140 34.1 0.133 32.0 0.127 29.8 44 .0010 0.170 42.3 0.163 39.9 0.157 37.6 0.150 35.4 0.144 33.3 0.137 31.2 45 .0011 0.181 43.4 0.175 41.1 0.168 38.8 0.161 36.7 0.155 34.6 0.148 32.5 46 .0011 0.192 44.5 0.186 42.2 0.179 39.9 0.173 37.9 0.166 35.8 0.160 33.8 .0012 47 0.204 45.5 0.198 43.3 0.191 41.1 0.185 39.0 0.178 37.0 0.171 35.0 48 .0012 0.217 46.5 0.210 44.3 0.203 42.1 0.197 40.1 0.190 38.1 0.184 36.1 49 .0012 0.229 47.5 0.222 45.3 0.216 43.2 0.209 41.2 0.203 39.2 0.196 37.2 50 .0013 0.242 48.4 0.235 46.3 0.229 44.2 0.222 42.2 0.216 40.2 0.209 38.3 51 .0013 0.255 49.3 0.249 47.2 0.242 45.2 0.236 43.2 0.229 41.2 0.222 39.3 .0014 i 52 0.269 50.2 0.263 48.1 0.256 46.1 0.249 44.1 0.243 42.2 0.236 40.3 53 .0015 0.284 51.1 0.277 49.0 0.270 47.0 0.264 45.1 0.257 43.2 0.250 41.3 54 .0015 0.298 51.9 0.292 49.8 0.285 47.9 0.279 46.0 0.272 44.1 0.265 42.3 55 .0015 0.314 52.7 0.307 50.7 0.300 48.7 0.294 46.8 0.287 45.0 0.281 43.2 56 .0016 0.330 53.5 0.323 51.4 0.316 49.5 0.310 47.7 0.303 45.9 0.296 44.1 .0016 57 0.346 54.3 0.339 52.2 0.333 50.3 0.326 48.5 0.319 46.7 0.313 44.9 58 .0017 0.363 55.0 0.356 52.9 0.350 51.1 0.343 49.2 0.336 47.5 0.330 45.7 59 .0017 0.380 55.7 0.373 53.6 0.367 51.8 0.360 50.0 0.354 48.2 0.347 46.5 60 .0018 0.398 56.4 0.391 54.3 0.385 52.5 0.378 50.7 0.371 49.0 0.365 47.3 61 .0018 0.416 57.0 0.410 55.0 0.403 53.2 0.396 51.4 0.390 49.7 0.383 48.1 .0019 62 0.436 57.6 0.429 55.6 0.422 53.9 0.416 52.1 0.409 50.4 0.402 48.8 63 .0020 0.455 58.2 0.449 56.3 0.442 54.5 0.435 52.8 0.429 51.1 0.422 49.5 64 .0021 0.476 58.8 0.469 56.9 0.462 55.1 0.456 53.4 0.449 51.8 0.4-12 50.2 65 .0021 0.497 59.3 0.490 57.5 0.483 55.8 0.477 54.1 0.470 52.4 0.-163 50.8 66 .0022 0.519 59.9 0.512 58.0 0.505 56.3 0.498 54.7 0.492 53.1 0.485 51.5 67 .0023 0.542 60.3 0.534 58.6 0.527 56.9 0.521 55.3 0.514 53.7 0.507 52.1 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.0013. B 60 PSYCHROMETRICAL TABLES. Temperature, Fahrenheit. — Force of Vapor in English Inches. — Relative Humidity in Hundredths. 12 t — t', or Difference of Wet and Dry Bulb Thermometers. Wet- Bulb Thermo- Mean Vertical Difference o°.o 9°.5 10°.0 10°.5 11°.0 11°.5 meter 4.1 of Force V Fahren- of Vapor for each Rela- Rela- Rela- Rela- Rela- Rela- heit. 0°.l. tive tive tive tive tive tive Force of Hu- Force of Hu- Force of HU- Force of Hu- ?orce of Hu Force of Hu- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- ity. ity. ity. ity. ity. ity. o Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. 68 0.0024 0.564 60.8 0.557 59.1 0.550 57.4 0.544 55.8 0.537 54.2 0.530 52.7 69 0.588 61.3 0.581 59.6 0.574 58.0 0.567 56.4 0.561 54.8 0.554 53.3 .0025 70 0.612 61.8 0.605 60.1 0.598 58.5 0.592 56.9 0.585 55.4 0.578 53.8 71 .00-25 0.637 62.3 0.630 60.6 0.624 59.0 0.617 57.4 0.610 55.9 0.603 54.4 .00:26 72 0.663 62.7 0.656 61.1 0.650 59.5 0.643 58.0 0.636 56.4 0.629 54.9 .0027 73 0.390 63.2 0.683 61.6 0.677 60.0 0.670 58.4 0.663 56.9 0.656 55.5 74 .0027 0.718 63.6 0.711 62.0 0.704 60.5 0.697 58.9 0.691 57.4 0.684 56.0 75 .0028 0.746 64.0 0.739 62.5 0.733 60.9 0.726 59.4 0.719 57.9 0.712 56.5 .0029 76 0.775 64.4 0.769 62.9 0.762 61.3 0.755 59.8 0.748 58.4 0.741 56.9 77 .0030 0.805 64.8 0.799 63.3 0.792 61.8 0.785 60.3 0.778 58.8 0.772 57.4 .0031 78 0.836 65.2 0.829 63.7 0.823 62.2 0.816 60.7 0.809 59.2 0.802 57.8 79 .0032 0.868 65.6 0.861 64.1 0.855 62.6 0.848 61.1 0.841 59.7 0.834 58.3 80 .0033 0.901 66.0 0.894 64.5 0.897 63.0 0.881 61.5 0.874 60.1 0.867 58.7 81 .0034 0.935 66.3 0.928 64.8 0.921 63.4 0.914 61.9 0.908 60.5 0.901 59.1 82 .0035 0.970 66.7 0.963 65.2 0.956 63.7 0.949 62.3 0.943 60.9 0.936 59.5 .0036 83 1.006 67.0 0.999 65.5 0.992 64.1 0.985 62.7 0.978 61.3 0.972 59.9 84 .0037 1.042 67.3 1.036 65.9 1.029 64.4 .022 63.0 1.015 61.7 1.008 60.3 85 .0033 1.080 67.7 1.073 66.2 1.067 64.8 .060 63.4 1.053 62.0 1.046 60.7 86 .0039 1.119 68.0 1.112 66.5 1.106 65.1 .099 63.7 1.092 62.4 1.085 61.0 87 .0040 1.160 68.3 1.153 66.8 1.146 65.4 .140 64.1 1.133 62.7 1.126 61.4 .0041 88 1.200 68.6 1.194 67.1 1.187 65.8 .180 64.4 1.173 63.1 1.166 61.7 89 .0042 1.243 68.9 1.236 67.4 1.229 66.1 .222 64.7 1.215 63.4 1.208 62.1 90 .0044 1.286 69.1 1.279 67.7 1.273 66.4 .266 65.0 1.259 63.7 1.252 62.4 91 .0045 1.331 69.4 1.324 68.0 1.317 66.7 1.311 65.3 1.304 64.0 1.297 62.7 92 .0046 1.377 69.7 1.370 68.3 1.363 67.0 1.357 65.6 1.350 64.3 1.343 63.1 .0047 93 1.425 69.9 1.418 68.6 1.411 67.2 1.404 65.9 1.397 64.6 1.390 63.4 94 .0048 1.473 70.2 1.466 68.8 1.459 67.5 1.452 66.2 1.446 64.9 1.439 63.7 95 .0050 1.523 70.4 1.516 69.1 1.509 67.8 1.502 66.5 1.495 65.2 1.488 64.0 96 .0051 1.574 70.7 1.567 69.4 1.560 68.0 1.553 66.7 1.546 65.5 1.539 64.2 97 .0053 1.627 70.9 1.620 69.6 1.613 68.3 1.606 67.0 1.599 65.8 1.592 64.5 98 .0054 1.681 71.2 1.674 69.8 1.667 68.5 1.660 67.3 1.653 66.0 1.646 64.8 .0056 99 1.736 71.4 1.729 70.1 1.722 68.8 .716 67.5 1.709 66.3 1.702 65.1 100 .0057 1.793 71.6 1.786 70.3 1.780 69.0 .773 67.8 1.766 66.5 1.759 65.3 101 .0058 1.852 71.8 1.845 70.5 1.838 69.3 .831 68.0 1.824 66.8 1.817 65.6 102 .0060 1.912 72.0 1.905 70.8 1.898 69.5 .891 68.2 1.884 67.0 1.877 65.8 103 .0062 1.974 72.3 1.967 71.0 1.960 69.7 .953 68.5 1.946 67.3 1.939 66.1 104 .0063 2.037 i 72.5 2.030 71.2 2.023 69.9 2.016 68.7 2.009 67.5 2.002 66.3 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.0013. B 61 13 PSYCHROMETR1CAL TABLES. Temperature, Fahrenheit. — Force of Vapor in English Inches. — Relative Humidity in Hundredth*. Wet- TVfpan t — t', or Difference of Wet and Dry Bulb Thermometers. Bulb Thermo jyxean Vertical Difference 12°.O 120.5 13°.O 13°.5 14°.0 14°.5 meter of Force t< of V-i nor Fahren- for each Rela- Rela- Rela- Rela- Rela- Rela- heit. 0°.l. tive tive tive tive tive tive Force of Hu- Force o Hu- Force o Hu- Force o Hu- Force of Hu- Force o Hu- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid ity. ity. ity. ity. ity. ity. o Bug. In Eng. In Eng. In Eng. In Eng. In Eng. In 32 0.0007 0.025 8.8 0.019 6.4 0.012 4.1 33 0.032 10.8 0.026 8.4 0.019 6.2 0.013 4.0 .0007 34 .0007 0.040 12.7 0.033 10.4 0.027 8.2 0.020 6.0 0.014 4.1 35 0.048 14.6 0.041 12.3 0.034 10.1 0.028 8.0 0.021 6.1 0.015 4.2 .0008 36 0.056 16.4 0.049 14.2 0.042 12.0 0.036 10.0 0.029 8.1 0.023 6.2 .0008 37 0.064 18.2 0.057 16.0 0.051 13.9 0.044 11.9 0.038 10.0 0.031 8.2 38 .0009 0.072 19.9 0.066 17.8 0.059 15.7 0.053 13.7 0.046 11.9 0.040 10.1 39 .0009 0.081 21.6 0.075 19.5 0.068 17.5 0.062 15.5 0.055 13.7 0.049 11.9 40 .0009 0.091 23.3 0.084 21.2 0.078 19.2 0.071 17.2 0.064 15.4 0.058 13.6 41 .0010 0.100 24.9 0.094 22.8 0.087 20.8 0.081 18.9 0.074 17.1 0.067 15.3 .0010 42 0.110 26.4 0.103 24.3 0.097 22.4 0.090 20.5 0.084 18.6 0.077 16.8 43 .0010 0.120 27.8 0.114 25.8 0.107 23.9 0.100 22.0 0.095 20.1 0.087 18.3 44 .0011 0.131 29.2 0.124 27.2 0.118 25.3 0.111 23.5 0.104 21.5 0.098 19.8 45 .0011 0.142 30.5 0.135 28.6 0.129 26.7 0.122 24.9 0.115 22.9 0.109 21.2 46 .0011 0.153 31.8 0.146 30.0 0.140 28.1 0.133 26.3 0.127 24.3 0.119 22.7 .0012 47 0.165 33.0 0.158 31.2 0.152 29.3 0.145 27.6 0.138 257 0.132 24.0 48 .0012 0.177 34.2 0.170 32.4 0.164 30.6 0.157 28.8 0.151 27.0 0.144 25.4 49 .0013 0.190 35.3 0.183 33.5 0.176 31.7 0.170 30.0 0.163 28.3 0.157 26.7 50 .0013 0.202 36.4 0.196 34.6 0.189 32.9 0.183 31.2 0.176 29.5 0.169 27.9 51 .0014 0.216 37-5 0.209 35.7 0.202 34.0 0.196 32.3 0.1S9 30.7 0.183 29.1 .0014 52 0.229 38.5 0.223 36.8 0.216 35.1 0.210 33.4 0.203 31.8 0.196 30.2 53 .0014 0.244 39.5 0.237 37.8 0.231 36.1 0.224 34.5 0.217 32.9 0.211 31.4 54 .0015 0.259 40.5 0-252 38.8 0.245 37.1 0.239 35.5 0.232 34.0 0.226 32.4 55 .0015 0.274 41.5 0.267 39.8 0.261 38.1 0.254 36.5 0.247 35.0 0.241 33.5 56 .0016 0.290 42.4 0.283 40.7 0.276 39.1 0.270 37.5 0.263 35.9 0.257 34.4 .0016 57 0.306 43.2 0.299 41.6 0.293 40.0 0.286 38.4 0.280 36.9 0.273 3S.4 58 .0017 0.323 44.1 0.316 42.4 0.310 40.8 0.303 39.3 0.296 37.8 0.290 36.3 59 .0017 0.340 44.9 0.334 43.3 0.327 41.7 0.320 40.1 0.314 38.7 0.307 37.2 60 .0018 0.358 45.7 0.351 44.1 0.345 42.5 0.338 41.0 0.331 39.5 0.325 38.1 61 .0018 0.376 46.4 0.370 44.9 0.363 43.3 0.356 41.8 0.350 40.3 0.343 38.9 .0019 62 0.396 47.2 0.389 45.6 0.382 44.1 0.376 42.6 0.369 11.2 0.362 39.8 63 .0020 0.415 47.9 0.409 46.4 0.402 44.8 0.395 43.4 0.389 41.9 0.382 40.6 64 .0021 0.436 48.6 0.429 47.1 0.422 45.6 0.416 44.1 0.409 42.7 0.402 41.3 65 .0021 0.457 49.3 0.450 47.8 0.443 46.3 0.437 44.8 0.431 43.4 0.423 42.1 66 .0022 0.478 49.9 0.472 48.4 0.465 47.0 0.458 45.5 0.452 44.1 0.445 42.8 67 .0023 0.501 50.6 0.494 49.1 0.487 47.6 0.481 46.2 0.474 44.8 0.467 43.5 i Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.0018. B PSYCHROMETRICAL TABLES. Temperature, Fahrenheit. — Force of Vapor in English Inches. —Relative Humidity hi Hundredths. 14 \Vet- t — t', or Difference of Wet and Dry Bulb Thermometers. ! Bulb Thermo- Vertical Difference 12°.O Q <"i o o i meter of Force * •*•** *" M.t» •«* J.* »V M.'A «tf t' of Vapor Fahren- for each Rela- Rela- Rela- Rela- Rela- Rela- heit. 0°.l. ?orce of tive Hu- Force of tive Hu- Force of tive Hu- Force o tive Hu- Force o tive Hu- Force ol tive Hu- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- ity. ity. ity. ity. ity. ity. o Eng. In. Eng. In. Eng. In. Eng. In Eng. In Eng In 63 0.0024 0.524 51.2 0.517 49.7 0.510 48.3 0.503 46.9 0.497 45.5 0.490 44.1 69 .0024 0.547 51.8 0.541 50.3 0.534 48.9 0.527 47.5 0.520 46.1 0.514 44.8 70 .0025 0.572 52.4 0.565 50.9 0.558 49.5 0.551 48.1 0.545 46.8 0.533 45.5 71 .0026 0.597 52.9 0.590 51.5 0.563 50.1 0.577 48.7 0.570 47.4 0.563 46.1 72 0.623 53.5 0.616 52.1 0.609 50.7 0.603 49.3 0.596 48.0 0.589 46.7 .00-26 73 .0027 0.650 54.0 0.613 52.6 0.636 51.3 0.629 49.9 0.623 48.6 0.616 47.3 74 .0023 0.677 54.5 0.670 53.2 0.664 51.8 0.657 50.5 0.650 49.2 0.643 47.9 75 .0029 0.705 55-0 0.699 53.7 0.602 52.3 0.685 51.0 0.678 49.7 0.672 48.4 76 .Of.30 0.735 55.5 0.728 54.2 0.721 52.9 0.714 51.5 0.708 50.3 0.701 48.9 77 0.765 56.0 0.759 54.7 0.752 53.4 0.745 52.1 0.739 50.8 0.731 49.5 .0031 73 .0032 0.796 56.5 0.782 55.2 0.782 53.8 0.775 52.5 0.768 51.3 0.762 50.0 79 .0033 0.827 56.9 0.821 55.6 0.814 54.3 0.807 53.0 0.800 51.8 0.794 50.5 80 .0034 0.360 57.3 0.853 56.1 0.847 54.8 0.840 53.5 0.833 52.2 0.826 51.0 81 .0035 0.894 57.8 0.887 56.5 0.880 55.2 0.874 53.9 0.867 52.7 0.860 51.4 82 0.929 58.2 0.922 56.9 0.915 55.6 0.909 54.4 0.902 53.2 0.895 51.9 .0036 83 .0037 0.965 58.6 0.958 57.3 0.951 56.1 0.944 54.8 0.937 53.6 0.931 52.4 84 1.002 5.9.0 0.995 57.7 0.988 56.5 0.981 55.2 0.974 54.0 0.963 52.8 .0038 85 .0039 1.039 59.4 1 .033 58.1 1.026 56.8 1.019 55.6 1.012 54.4 .005 53.2 86 .0040 1.078 59.7 1.071 58.5 1.065 57.2 1.058 56.0 1.051 54.8 .044 53.6 87 1.119 60.1 1.112 58.8 1.105 57.6 1.099 56.4 1.092 55.2 .085 54.0 .0041 88 1.159 60.5 1.152 59.2 1.146 58.0 1.139 56.8 1.132 55.6 .125 54.4 89 .0042 1.202 60.9 1.195 59.6 1.188 58.3 1.181 57.1 1.174 56.0 .167 54.8 .0044 90 1.245 61.3 1.238 59.9 1.231 58.7 1.225 57.5 1.218 56.3 1.211 55.2 91 .0045 1.290 61.6 1 .283 60.2 1.276 59.0 1.269 57.9 1.263 66.7 1.256 55.6 92 .0046 1.336 61.9 1.329 60.6 1.322 59.4 1.315 58.2 1.309 57.0 1.302 55.9 .0047 93 1.383 62.2 1.376 60.9 1.370 59.7 1.363 58.5 1.356 57.4 1.349 56.3 94 .0049 1.432 62.5 1.425 61.2 1.418 60.0 1.411 58.9 1.404 57.7 .397 56.6 95 .0050 1.482 62.7 1.475 61.5 1.468 60.4 1.461 59.2 1.454 58.1 .447 57.0 96 .0051 1.533 63.0 1.526 61.8 1.519 60.7 1.512 59.5 1.505 58.4 .498 57.3 97 .0052 1.585 63.3 1.578 62.1 1.571 61.0 1.564 59.8 1.558 58.7 .551 57.6 98 .0054 1.639 63.6 1.632 62.4 1.625 61.3 1.618 60.1 1.612 59.0 .605 57.9 .0056 99 1.695 63.9 1.688 62.7 1.681 61.6 1.674 60.4 1.667 59.3 .660 58.2 100 .0057 1.752 64.2 1.745 63.0 1.733 62.0 1.731 60.7 1.724 59.6 .717 58.5 101 .0059 1.810 64.4 1.803 63.2 1.797 62.3 1.790 61.0 1.783 59.9 .776 58.8 102 .0060 1.870 64.7 1.S63 63.5 1.857 62.6 1.850 61.3 1.843 60.2 1.636 59.1 103 .0062 1.932 64.9 1.925 63.8 1.918 62.9 1.911 61.5 1.904 60.4 1.897 59.4 104 .0063 1.995 65.2 1.988 64.0 1.981 63.2 1.974 61.8 1.967 60.7 1.960 59.6 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.0013. B 63 15 PSYCHROMETRICAL TABLES. Temperature, Fahrenheit. — Force of Vapor in English Inches. — Relative Humidity in Hundredths. t — tf j or Difference of Wet and Dry Bulb Thermometers. I Bulb Vertical Thermo- Difference 15°.0 15°.5 16°.O 16°.5 17°»O 17°»5 meter of Force of Vapor Fahren- for each JRela- Rela- Rela- Rela- Rela- Rela- heit. 0°.l. Vapor. tive Hu- mid- Force of Vapor. tive Hu- mid- Force of Vapor. tive Hu- mid- Force of Vapor. tive Hu- mid- Force of Vapor. tive Hu- mid- Force of Vapor. tive Hu- mid- ity. ity. ity. ity. ity. ity. 0 Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. 32 33 34 35 36 0.016 4.4 0.0009 37 0.025 6.4 0.018 4.6 .0009 38 0.033 8.3 0.027 6.5 0.020 4.8 0.014 3.2 39 .0009 .0009 0.042 10.1 0.036 8.4 0.029 6.7 0.023 5.1 0.016 3.6 0.010 2.1 40 0.051 11.9 0.045 10.1 0.038 8.5 0.032 6.9 0.025 5.4 0.019 3.9 .0010 41 0.061 136 0.054 11.8 0.048 10.3 0.041 8.7 0.035 7.2 0.028 5.7 .0010 42 nn i A 0.071 15.1 0.064 13.4 0.058 11.9 0.051 10.3 0.044 8.8 0.038 7.4 43 •UU1U 0.081 16.6 0.074 15.0 0-068 13.4 0.061 11.9 0.055 10.4 0.048 9.0 .001 1 44 0.091 18.1 0.085 16.5 0.078 15.0 0.072 13.5 0.065 12.0 0.058 10.6 45 .0011 0.102 19.6 0.096 18.0 0.089 16.5 0.083 15.0 0.076 13.5 0.069 12.1 46 .0011 0.114 21.0 0.107 19.4 0.100 17.9 0.094 16.4 0.087 15.0 0.081 13.6 .0012 47 0.125 22.4 0.119 20.8 0.112 19.3 0.106 17.9 0.099 16.5 0.092 15.1 [ 48 .0012 0.137 23.8 0.131 22.2 0.124 20.7 0.118 19.3 0.111 17.9 0.104 16.5 49 .0013 0.150 25.1 0.143 23.6 0.137 22.1 0.130 20.7 0.124 19.3 0.117 17.9 50 .0013 0.163 26.4 0.156 24.9 0.150 23.4 0.143 22.0 0.136 20.6 0.130 19.3 51 .0013 0.176 27.6 0.169 26.1 0.163 24.6 0.156 23.2 0.150 21.9 0.143 20.6 .0014 52 0.190 28.7 0.183 27.3 0.177 25.8 0.170 24.4 0.163 23.1 0.157 21.8 53 .0014 0.204 29.9 0.197 28.4 0.191 27.0 0.184 25.6 0.178 24.3 0.171 23.0 54 .0015 0.219 30.9 0.212 29.5 0.206 28.1 0.199 26.7 0.192 25.4 0.186 24.1 55 .0015 0.234 32.0 0.228 30.6 0.221 29.2 0.214 27.8 0.208 26.5 0.201 25.2 56 .0016 0.250 33.0 0.243 31.6 0.237 30.2 0.230 2S.9 0.223 27.6 0.217 26.3 .0016 57 0.266 34.0 0.260 32.6 0.253 31.2 0.246 29.9 0.240 28.6 0.233 27.3 58 .0017 0.283 34.9 0.276 33.5 0.270 32.2 0.268 30.8 0.256 29.6 0.249 28.3 59 .0017 0.300 35.8 0.294 34.4 0.287 33.1 0.280 31.8 0.274 30.5 0.267 29.3 60 .0018 0.318 36.7 0.311 35.3 0.305 34.0 0.298 32.7 0.291 31.4 0.285 30.2 61 .0019 0.336 37.5 0.330 36.2 0.323 34.9 0.316 33.6 0.310 32.4 0.303 31.2 .0019 62 0.356 38.4 0.349 37.0 0.342 35.7 0.336 34.5 0.329 33.2 0.322 32.0 63 .0020 0.375 39.2 0.369 37.9 0.362 36.6 0.355 35.3 0.349 34.1 0.312 32.9 64 .0020 0.396 40.0 0.389 38.7 0.382 37.4 0.376 36.1 0.369 34.9 0.362 33.7 65 .0021 0.417 40.7 0.410 39.4 0.403 38.2 0.396 36.9 0.390 35.7 0.383 34.5 66 .0022 0.43S 41.5 0.431 40.2 0.425 38.9 0.418 37.7 0.411 36.5 0.405 35.3 67 .0023 0.460 42.2 0.454 40.9 0.447 39.6 0.440 38.4 0.434 37.2 0.427 36.1 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.0013. B 64 PSYCHROMETRICAL TABLES. 16 Temperature, Fahrenheit. — Force of Vapor in English Inches. — Relative Humidity in Hundredths. Tir_A_. t — t', or Difference of Wet and Dry Bulb Thermometers. Wet- Bulb Thermo- JVleftii Vertical Difference 15°.0 15°.5 16°.0 16°.5 17°.0 17°.5 meter £i of Force Fahren- for each Rela- Rela- Rela- Rela- Rela- Rela- heit. 0°.l. Force of tive Hu- Force of tive Hu- Force of tive Hu- force of tive Hu- Force of tive Hu- ?orce of tive Hu- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- , Vapor. mid- Vapor. mid- ity. ity. ity. ity. ity. ity. o Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. 68 0.483 42.8 0.477 41.6 0.470 40.3 0.463 39.1 0.456 37.9 0.450 36.8 69 0.0024 0.507 43.5 0.500 42.3 0.594 41.0 0.487 39.8 0.480 38.7 0.473 37.5 70 .0024 0.531 44.2 0.524 42.9 0.518 41.7 0.511 40.5 0.504 39.3 0.498 38.2 71 .0025 0.556 44.8 0.550 43.6 0.543 42.4 0.536 41.2 0.529 40.0 0.523 38.9 72 .0026 0.582 45.4 0.576 44.2 0.569 43.0 0.562 41.8 0.555 40.7 0.549 39.5 .0027 73 0.609 46.0 0.602 44.8 0.596 43.6 0.589 42.4 0.582 41.3 0.575 40.2 74 .00-28 0.637 46.6 0.630 45.4 0.623 44.2 0.616 43.0 0.610 41.9 0.603 40.8 75 .0028 0.665 47.2 0.658 46.0 0.651 44.8 0.645 43.6 0.638 42.5 0.631 41.4 76 .0029 0.694 47.7 0.687 46.5 0.681 45.4 0.674 44.2 0.667 43.1 0.660 42.0 77 .0030 0.724 48.2 0.717 47.1 0.711 45.9 0.704 44.8 0.697 43.6 0.690 42.6 .0031 78 0.755 48.8 0.748 47.6 0.741 46.4 0.735 45.3 0.728 44.2 0.721 43.1 79 .0032 0.787 49.3 0.780 48.1 0.773 47.0 0.766 45.8 0.760 44.7 0.753 43.7 80 .0033 0.820 49.8 0.813 48.6 0.806 47.5 0.799 46.4 0.792 45.3 0.786 44.2 81 .0034 0.853 50.3 0.847 49.1 0.840 48.0 0.833 46.9 0.826 45.8 0.819 44.6 82 .0035 0.888 50.7 0.881 49.6 0.875 48.5 0.868 47.4 0.861 46.3 0.854 45.1 .0030 83 0.924 51.2 0.917 50.0 0.910 48.9 0.903 47.8 0.897 46.8 0.890 45.6 84 .0037 0.961 51.6 0.954 50.5 0.947 49.4 0.940 48.3 0.933 47.2 0.927 46.2 85 .0038 0.998 52.1 0.992 50.9 0.985 49.8 0.978 48.7 0.971 47.7 0.964 46.6 86 .0039 1.037 52.5 1.030 51.3 1.024 50.3 1.017 49.2 1.010 48.1 1.003 47.1 87 .0040 1.078 52.9 1.071 51.8 1.064 50.7 1.058 49.6 1.051 48.6 1.044 47.5 .0041 88 1.118 53.3 1.111 52.2 1.105 51.1 1.098 50.0 1.091 49.0 1.084 48.0 89 .0042 1.161 53.7 1.154 52.6 1.147 51.5 1.140 50.4 1.133 49.4 1.126 48.4 90 .0044 1.204 54.1 1.197 53.0 1.190 51.9 1.183 50.9 1.177 49.8 1.170 48.8 91 .0045 1.249 54.5 1.242 53.4 1.235 52.3 1.228 51.2 1.221 50.2 1.215 49.2 92 .0046 1.295 54.8 1.288 53.7 1.281 52.7 1.274 51.6 1.267 50.6 1.260 49.6 .0048 1 93 1.342 55.2 1.335 54.1 1.328 53.0 1.321 52.0 1.315 51.0 1.308 50.0 94 .0049 1.390 55.5 1.384 54.4 1.377 53.4 1.370 52.4 1.363 51.4 1.356 50.4 95 .0050 1.440 55.9 1.433 54.8 1.426 53.7 1.420 52.7 1.413 51.7 1.406 50.7 96 .0051 1.491 56.2 1.484 55.1 1.477 54.1 1.471 53.1 1.464 52.1 1.457 51.1 97 .0053 1.544 56.5 1.537 55.5 1.530 54.4 1.523 53.4 1.516 52.4 1.509 51.5 98 .0054 1.598 56.8 1.591 55.8 1.584 54.8 1.577 53.8 1.570 52.8 1.563 51.8 .0056 99 1.653 57.2 1.646 56.1 1.639 55.1 1.633 54.1 1.626 53.1 1.619 52.1 100 .0057 1.710 57.5 1.703 56.4 1.696 55.4 1.690 54.4 1.683 53.4 1.676 52.5 101 .0059 1.769 57.8 1.762 56.7 1.755 55.7 1.748 54.7 1.741 53.7 1.734 52.8 102 .0060 1.829 58.0 1.822 57.0 1.815 56.0 1.809 55.0 1.802 54.0 1.794 53.1 103 .0062 1.890 58.3 1.883 57.3 1.876 56.3 1.869 55.3 1.863 54.3 1.856 53.4 104 .0063 1.953 58.6 1.946 57.6 1.939 56.6 1.932 55.6 1.925 54.6 1.919 53.7 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.0013. B 65 PSYCHROMETRICAL TABLES. Temperature, Fahrenheit. — Force of Vapor in English Inches. — Relative Humidity in Hundredths. AT,!,. »-. t — t', or Difference of Wet and Dry Bulb Thermometers. j Wet- Bulb TLiermo Mean Vertical Differenc 18°.0 18°.* 19°.0 19°.5 20°.O 20°.5 i meter of Force • Fahren- heit. for each Force o Vapor. Rela- tive Hu- mid- Force o Vapor. Rela- tive Hu- mid- Force o Vapor. Rela- tive Hu- mid- Force o: Vapor. Rela- tive Hu- mid- Force o1 Vapor. 1 Rela- ! tive Hu- mid- Force oi Vapor. Rela- J tive Hu- mid- ity. ity. ity ity. ity. ity. o Eng. In Eng. In Eng. In Eng. In Eng. In Eng. In. 32 33 34 , 35 36 37 no oo 39 40 0.012 2.5 41 0.0010 0.022 4.3 0.015 3.0 0.009 1.6 .0010 42 0.031 6.0 0.025 4.6 0.018 3.3 0.012 2.1 43 .0010 0.041 7.6 0.035 6.3 0.028 5.0 0.022 3.7 0.015 2.6 44 .0011 0.052 9.2 0.045 7.9 0.039 6.6 0.032 5.4 0.026 4.3 0.019 3.2 45 .0011 0.063 10.8 0.056 9.5 0.050 8.2 0.043 7.0 0.037 5.9 0.030 4.8 46 .0011 0.074 12.3 0.068 11.0 0.061 9.7 0.054 8.5 0.048 7.5 0.041 6.3 .0012 47 0.086 13.8 0.079 12.5 0.073 11.2 0.066 10.0 0.059 9.0 0.053 7.9 48 .0012 0.098 15.2 0.091 13.9 0.085 12.7 0.078 11.5 0.072 10.4 0.065 9.3 49 .0013 0.110 16.6 0.104 15.4 0.097 14.1 0.091 12.9 0.084 11.9 0.077 10.7 50 .0013 0.123 18.0 0.117 16.7 0.110 15.5 0.103 14.4 0.097 13.2 0.090 12.1 51 .0013 0.136 19.3 0.130 18.0 0.123 16.8 0.117 15.7- 0.110 14.5 0.103 13.4 .0014 52 0.150 20.5 0.144 19.3 0.137 18.1 0.130 16.9 0.124 15.7 0.117 14.6 53 .0014 0.164 21.7 0.158 20.5 0.151 19.3 0.145 18.2 0.138 16.9 0.131 15.8 54 .0015 0.179 22.9 0.173 21.7 0.166 20.5 0.159 19.3 0.152 18.1 0.146 17.0 55 .0015 0.194 24.0 0-188 22.8 0.181 21.6 0.174 20.5 0.168 19.2 0.161 18.2 56 .0016 0.210 25.1 0.203 23.9 0.197 22.7 0.190 21.6 0.184 20.4 0.177 19.3 .0016 57 0.226 26.1 0.220 24.9 0.213 23.8 0.206 22.7 0.200 21.5 0.193 20.4 58 .0017 0.243 27.1 0.236 25.9 0.230 24.8 0.223 23.7 0.217 22.6 0.210 21.5 59 .0017 0.260 28.1 0.254 26.9 0.247 25.8 0.240 24.7 0.234 23.6 0.227 22.6 60 .0018 0.278 29.0 0.271 27.9 0.265 26.8 0.258 25.7 0.251 24.6 0.245 23.6 61 .0019 0.296 30.0 0.290 28.8 0.283 27.7 0.276 26.6 0.270 25.5 0.263 24.5 .0019 62 0.316 30.9 0.309 29.7 0.302 28.6 0.295 27.5 0.289 26.5 0.282 25.4 63 .0020 0.335 31.7 0.328 30.6 0.322 29.5 0.315 28.4 0.308 27.4 0.302 26.4 64 .0020 0.355 32.6 0.349 31.5 0.342 30.4 0.335 29.3 0.329 28.2 0.322 27.2 65 .0021 0.376 33.4 0.370 32.3 0.363 31.2 0.356 30.1 0.350 29.1 0.343 28.1 66 .0022 0.398 34.2 0.391 33.1 0.385 32.0 0.378 30.9 0.371 29.9 0.364 28.9 67 .0023 0.420 34.9 0.414 33.8 0.407 32.8 0.400 31.7 0.393 30.7 0.387 29.7 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.0013. B 66 PSYCHROMETRICAL TABLES. Temperature, Fahrenheit. — Force of Vapor in English Inches — Relative Humidity in Hundredtha. 13 Wot- Mean t — t', or Difference of Wet and Dry Bulb Thermometers. Bulb Thermo- Vertical Difference 18°.0 18°.5 19°.0 19°.5 20°.0 2O°.5 meter of Force ^/ of Vapor Fahren- for each Rela- Rela- Rela- Rela- R«la- 1 Rela- i heit. 0°.l. Force of tive Hu- Force of tive Hu- Force ol tive Hu- Force o tive Hu- Force of tive Hu- Force of] Hu- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mj,i. ity. ity. ity. ity. •ity. ity. o Eng. In. Eng. In. Eng. In. Eng. In Eng. In. Eng. In 68 0.0024 0.443 35.7 0.436 34.6 0.430 33.5 0.423 32.5 0.416 31.4 0.409 3CT.4 69 .0025 0.467 36.4 0.460 35.3 0.453 34.2 0.446 33.2 0.440 32.2 0.433 31.2 70 .0025 0.491 37.1 0.484 36.0 0.477 35.0 0.471 33.9 0.464 32.9 0.457 31.9 71 .0026 0.516 37.8 0.509 36.7 0.502 35.7 0.496 34.6 0.489 33.6 0.482 32.7 72 0.542 38.5 0.535 37.4 0.528 36.3 0.522 35.3 0.515 34.3 0.508 33.4 .0026 73 .0027 0.569 39.1 0.562 38.0 0.555 37.0 0.548 36.0 0.542 35.0 0.535 34.0 74 .0023 0.596 39.7 0.589 38.7 0.583 37.7 0.576 36.6 0.569 35.7 0.562 34.7 | 75 .0029 0.624 40.3 0.618 39.3 0.611 38.3 0.604 37.3 0.597 36.3 0.591 35.3 76 .0030 0.654 40.9 0.647 39.9 0.640 38.9 0.633 37.9 0.627 36.9 0.620 35.9 77 0.683 41.5 0.677 40.5 0.670 39.5 0.663 38.5 0.656 37.5 0.650 36.5 .0031 78 .0032 0.714 42.1 0.707 41.0 0.701 40.0 0.694 39.0 0.687 38.1 0.680 37.1 79 0.746 42.6 0.739 41.6 0.732 40.6 0.726 39.6 0.719 38.6 0.712 37.7 .0033 80 .0034 0.779 43.2 0.772 42.1 0.765 41.1 0.758 40.2 0.752 39.2 0.745 38.3 81 .0035 0.813 43.7 0.806 42.7 0.799 41.7 0.792 40.7 0.785 39.7 0.779 38.8 82 0.847 44.2 0.840 43.2 0.834 42.2 0.827 41.2 0.820 40.2 0.813 39.4 .0036 83 0.883 44.7 0.876 43.7 0.869 42.7 0.863 41.7 0.856 40.7 0.849 39.9 84 .0036 0.920 45.2 0.913 44.2 0.906 43.2 0.899 42.2 0.893 41.3 0.886 40.4 85 .0038 0.958 45.6 0.951 44.6 0.944 43.7 0.937 42.7 0.930 41.8 0.923 40.9 .0039 86 0.996 46.1 0.989 45.1 0.983 44.1 0.976 43.2 0.969 42.3 0.962 41.3 .0040 87 1.037 46.5 1.030 45.6 1.023 44.6 1.017 43.6 1.010 42.7 1.003 41.8 .U041 88 1.077 47.0 1.070 46.0 1.064 45.0 .057 44.1 1.050 43.2 1.043 42.3 89 .0042 1.119 47.4 1.113 46.4 1.106 45.5 .099 44.5 1.092 43.6 1.085 42.7 90 .0043 1.163 47.8 .156 46.9 1.149 45.9 .142 45.0 1.136 44.1 1.129 43.2 91 .0045 1.208 48.2 .201 47.3 1.194 46.3 .187 45.4 1.180 44.5 1.173 43.6 92 .0047 1.254 48.6 .247 47.7 1.240 46.7 .233 45.8 1.226 44.9 1.219 44.0 .0048 93 1.301 49.0 .294 48.1 1.287 47.1 .280 46.2 1.273 45.3 1.266 •44.4 94 .0049 1.349 49.4 .342 48.4 1.335 47.5 .329 46.6 1.322 45.7 1.315 44.8 95 .0050 1.399 49.8 .392 48.8 1.385 47.9 .378 47.0 1.371 46.1 1.364 45.2 96 .0051 1.450 50.1 .443 49.2 1.436 48.3 .429 47.3 1.422 46.5 1.415 45.6 97 .0053 1.502 50.5 .495 49.5 1.489 48.6 .482 47.7 1.475 46.8 1.468 46.0 98 .0054 1.556 50.8 .549 49.9 1.543 49.0 .536 48.1 1.529 47.2 1.522 46.3 .0055 99 1.612 51.2 .605 50.2 1.598 49.3 .591 48.4 1.584 47.5 1.577 46.7 100 .0057 1.669 51.5 .662 50.6 1.655 49.7 .648 48.8 1.641 47.9 1.634 47.0 101 .0058 1.727 51.8 .720 50.9 1.713 50.0 .706 49.1 1.700 48.2 1.693 47.4 102 .0060 1.787 52.2 .780 51.2 1.773 50.3 .766 49.4 1.759 48.6 1 .753 47.7 103 .0062 1.849 52.5 .842 51.5 1.835 50.7 1.828 49.8 1.821 48.9 1.814 48.0 j 104 .0063 1.912 52.8 .905 51.9 1.898 51.0 1.891 50.1 1.884, 49.2 1.877 48.4 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.0013. 67 PSYCHROMETRICAL TABLES. Temperature, Fahrenheit. — Force of Vapor in English Inches. — Relative Humidity in Hundredths. Wet- Mean t— t', or Difference of Wet and Dry Bulb Thermometers. Bulb Thermo meter t< Vertical Differenc of Force of Vapoi 21°.0 21°.5 22°.0 22°.5 23°.0 23°.& Fahren for each Rela- Rela- Rela- Rela- Rela- JRcla- heit. 0°.l. Force o Vapor. tive Hu- mid- Force o Vapor. tive Hu- mid- Force o Vapor. tive Hu- mid- Force o Vapor. tive Hu- mid- Force ol Vapor. tive Hu- mid- Vapor. J tive Hu- mid . ity. ity. ity ity. ity. ity. o Eng. In Eng. In Eng. In Eng. In Eng. In Eng. In 32 33 34 35 36 37 38 on oil 40 41 42 43 44 0.013 2.0 45 0.0011 0.023 3.7 0.017 2.6 0.010 1.6 46 .0011 0.035 5.2 0.028 4.2 0.022 3.1 0.015 2.1 .0012 47 0.046 6.8 0.040 5.7 0.033 4.7 0.027 3.7 0.020 2.7 0.013 1.8 48 .001-2 0.058 8.2 0.052 7.2 0.045 6.2 0.039 5.2 0.032 4.2 0.025 3.3 49 .0013 0.071 9.7 0.064 8.6 0.058 7.6 0.051 6.6 0.044 5.7 0.038 4.7 50 .0013 0.084 11.0 0.077 10.0 0.070 9.0 0.064 8.0 0.057 7.1 0.051 6.1 51 .0013 0.097 12.3 0.090 11.3 0.084 10.3 0.077 9.3 0.070 8.3 0.064 7.4 .0014 52 0.110 13.5 0.104 12.5 0.097 11.5 0.091 10.6 0.084 9.6 0.077 8.7 53 .0014 0.125 14.8 0.118 13.7 0.111 12.8 0.105 11.8 0.098 10.9 0.092 9.9 M .0015 0.139 16.0 0.133 14.9 0.126 14.0 0.120 13.0 0.113 12.1 0.106 11.2 55 .0015 0.155 17.1 0.148 16.1 0.141 15.1 0.135 14.2 0.128 13.3 0.121 12.4 56 .0016 0.170 18.2 0.164 17.2 0.157 16.3 0.150 15.3 0.144 14.4 0.137 13.5 .0016 57 , 0.186 19.4 0.180 18.4 0.173 17.4 0.167 16.5 0.160 15.6 0.153 14.7 58 .0017 0.203 20.5 0.197 19.5 0.190 18.5 0.183 17.6 0.177 16.7 0.170 15.8 59 .00 n 0.220 21.5 0.214 20.6 0.207 19.6 0.200 18.7 0.194 1.7.7 0.187 16.9 60 .0018 0.238 22.5 0.231 21.6 0.225 20.6 0.218 19.6 0.211 18.7 0.205 17.8 €1 .0019 0.256 23.4 0.250 22.5 0.243 21.5 0.236 20.6 0.230 19.7 0.223 18.8 .0019 €2 0.275 24.4 0.269 23.5 0.262 22.4 0.255 21.5 0.249 20.6 0.242 19.7 63 .0020 0.295 25.3 0.288 24.4 0.282 23.3 0.275 22.4 0.268 21.5 0.262 20.7 64 .0020 0.315 26.1 0.309 25.3 0.302 24.2 0.295 23.3 0.289 22.4 0.282 21.6 65 .0021 0.336 27.0 0.330 26.1 0.323 25.1 0.316 24.2 0.309 23.3 0.303 22.4 66 .0022 0.358 27.9 0.351 27.0 0.344 26.0 0.338 25.1 0.331 24.2 0.324 23.3 67 .0023 0.380 28.7 0.373 27.8 0.367 26.8 0.360 25.9 0.353 25.0 0.346 24.2 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.0013. B 68 PSYCHROMETRICAL TABLES. 20 Temperature, Fahrenheit. — Force of Vapor in English Inches. — Relative Humidity in Hundredths. t — t', or Difference of Wet and Dry Bulb Thermometers. Wet- Bulb Thermo- Mean Vertical Difference 21° 0 2l°.5 220.0 220.5 23°.0 230.5 meter of Force t' Fahren- of Vapor for each Rela- Rela- 1 Rela- Rela- Rela- Rela- heit. 0°.l. Force of tive Hu- Force of tive Hu- 1 tive Force of jju. Force of tive Hu- Force of tive Hu Force of tive Hu- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- ity ity. ity. ity. ity. ity. o Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. 68 0.403 29.5 0.396 28.5 0.389 27.6 0.383 26.7 0.376 25.8 0.369 25.0 69 0.0024 0.426 30.2 0.420 29.3 0.413 28.4 0.406 27.5 0.399 26.6 0.393 25.8 70 .00-24 0.451 31.0 0.444 30.1 0.437 29.1 0.430 28.2 0.424 27.4 0.417 26.5 71 .00-25 0.476 31.7 0.469 30.8 0.462 29.9 0.455 29.0 0.449 28.1 0.442 27.3 72 .0026 0.501 32.4 0.495 31.5 0.488 30.6 0.481 29.7 0.475 28.8 0.468 28.0 .0027 73 0.528 33.1 0.521 32.2 0.515 31.3 0.508 30.4 0.501 29.5 0.494 28.7 74 .0028 0.556 33.8 0.549 32.8 0.542 31.9 0.535 31.1 0.529 30.2 0.522 29.4 75 .0028 0.584 34.4 0.577 33.5 0.570 32.6 0.564 31.7 0.557 30.9 0.550 30.0 76 .0029 0.613 35.0 0.606 34.1 0.599 33.2 0.593 32.3 0.586 31.5 0.579 30.7 77 .0030 0.643 35.6 0.636 34.7 0.629 33.8 0.623 33.0 0.616 32.1 0.609 31.3 .0031 78 0.674 36.2 0.667 35.3 0.660 34.4 0.653 33.6 0.647 32.7 0.640 31.9 79 .0032 0.705 36.8 0.699 35.9 0.692 35.0 0.685 34.2 0.678 33.3 0.671 32.5 80 .0033 0.738 37.4 0.731 36.5 0.724 35.6 0.718 34.7 0.711 33.9 0.704 33.1 81 .0034 0.772 37.9 0.765 37.0 0.758 36.1 0.751 35.3 0.745 34.5 0.738 33.5 82 .0035 0.806 38.4 0.800 37.6 0.793 36.7 0.786 35.8 0.779 35.0 0.772 34.2 .0036 83 0.842 39.0 0.835 38.1 0.829 37.2 0.822 36.4 0.815 35.5 0.808 34.7 84 .0037 0.879 39.5 0.872 38.6 0.865 37.7 0.858 36.9 0.852 36.1 0.845 35.2 85 .0038 0.917 40.0 0.910 39.1 0.903 38.2 0.896 37.4 0.889 36.6 0.882 35.8 86 .0039 0.955 40.4 0.948 39.6 0.942 38.7 0.935 37.9 0.928 37.1 0.921 36.3 87 .0040 0.995 40.9 0.988 40.1 0.981 39.2 0.975 38.4 0.968 37.5 0.961 36.7 .0041 88 1.036 41.4 1.029 40.5 1.022 39.7 .016 38.8 1.009 38.0 1.002 37.2 89 .0042 1.078 41.8 1.071 41.0 1.065 40.1 .058 39.3 1.051 38.5 1.044 37.7 90 .0044 1.122 42.3 1.115 41.4 1.108 40.6 .101 39.7 1.094 38.9 1.088 38.1 91 .0045 1.166 42.7 1.160 41.9 1.153 41.0 .146 40.2 1.139 39.4 1.132 38.6 92 .0046 1.212 43.1 1.206 42.3 1.199 41.4 .192 40.6 1.185 39.8 1.178 39.0 .0045 93 1.260 43.5 1.253 42.7 1.246 41.9 .239 41.0 1.232 40.2 1.225 39.4 94 .0049 1.308 43.9 1.301 43.1 1.294 42.3 .287 41.4 1.280 40.6 1.274 39.9 95 .00.50 1.358 44.3 1.351 43.5 1.344 42.7 .337 41.8 1.330 41.0 1.323 40.3 96 .0051 1.408 44.7 1.402 43.9 1.395 43.0 .338 42.2 1.381 41.4 1.374 40.7 97 .0053 1.461 45.1 1.454 44.3 1.447 43.4 .440 42.6 1.433 41.8 1.426 41.1 98 .0054 1.515 45.5 1.508 44.6 1.501 43.8 .494 43.0 1.487 42.2 1.480 41.4 .0056 99 1.570 45.8 1.563 45.0 1.556 44.2 .550 43.4 1.543 42.6 1.536 41.8 100 .0057 1.627 46.2 1.620 45.4 1.613 44.5 .607 43.7 1.600 43.0 1.593 42.2 101 .0059 1.686 46.5 1.679 45.7 1.672 44.9 .665 44.1 .658 43.3 1.651 42.5 102 .0060 1.746 4G.8 '1.739 46.0 1.732 45.2 1.725 44.4 .718 43.7 1.711 42.9^ 103 .0062 1.807 47.2 1.800 46.4 1.793 45.6 1.7S6 44.8 .779 44.0 1.772 43.2* 104 .0063 1.870 47.5 1.863 46.7 1.856 45.9 *1.S49 45.1 .842 44.3 1.835 43.6 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.0013. B 69 PSrCHROMETRlCAL TABLES, Temperature, Fahrenheit. — Force of Vapor in English Inches. — Relative Humidity in Hundredtha. w»t- t — t', or Difference of Wet and Dry Bulb Thermometers. Bulb Thermo- meter Vertical Difference of Force 240.O 24°.5 25°.O 25°.5 26°.O 26°.5 f of Vapor Fahren- for each Rela- 1 Rela- Rela- Rela- Rela- Rela- heit. 0°.l. ?orce of Vapor. tive Hu- mid- Force of Vapor. tive Hu- mid- Force of Vapor. tive Hu- mid- Force of Vapor. tive Hu- mid- Force of Vapor. tive Hu- mid- Force of Vapor. tive Hu- mid- ity. ity. ity. ity. ity. ity. o Eng. In Eng. In Eng. In. Eng. In. Eng. In Eng. In 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 0.019 2.4 0.012 1.5 0.0013 49 0.031 3.9 0.025 3.0 0.018 2.2 0.011 1.3 50 .0013 0.044 5.2 0.037 4.4 0.031 3.6 0.024 2.7 0.018 2.0 0.011 1.2 51 .0013 0.057 6.5 0.051 5.7 0.044 4.9 0.037 4.1 0.031 8.3 0.024 2.5 .0014 52 0.071 7.8 0.064 7.0 0.058 6.1 0.051 5.3 0.044 4.6 0.038 3.8 53 .0014 0.085 9.1 0.078 8.2 0.072 7.4 0.065 6.6 0.058 5.8 0.052 5.1 54 .0015 0.100 10.3 0.093 9.4 0.086 8.6 0.080 7.8 0.073 7.0 0.067 6.3 55 .0015 0.115 11.5 0.108 10.6 0.102 9.8 0.095 9.0 0.088 8.2 0.082 7.5 56 .0016 0.130 12.7 0.124 11.8 0.117 11.0 0.111 10.2 0.104 9.4 0.097 8.7 .0016 57 0.147 13.8 0.140 13.0 0.133 12.1 0.127 11.3 0.120 10.6 0.113 9.8 58 .0017 0.163 14.9 0.157 14.1 0.150 13.2 0.143 12.5 0.137 11.7 0.130 10.9 59 .0017 0.180 16.0 0.174 15.2 0.167 14.3 0.161 13.6 0.154 12.8 0.147 12.0 60 .0018 0.198 17.0 0.191 16.1 0.185 15.3 0.178 14.6 0.172 13.8 0.165 13.0 61 .0019 0.216 17.9 0.210 17.1 0.203 16.3 0.196 15.5 0.190 14.7 0.183 14.0 .0019 62 0.235 18.9 0.229 18.1 0.222 17.2 0.215 16.5 0.209 15.7 0.202 15.0 63 .0020 0.255 19.8 0.248 19.0 0.242 18.2 0.235 17.4 0.228 16.6 0.222 15.9 64 .0020 0.275 20.7 0.269 19.9 0.262 19.1 0.255 18.3 0.248 17.5 0.242 16.8 65 .0021 0.296 21.6 0.289 20.8 0.283 20.0 0.276 19.2 0.269 18.4 0.263 17.7 66 .0022 0.318 22.5 0.311 21.7 0.304 20.9 0.297 20.1 0.291 19.8 0.284 18.6 67 .0023 0.340 23.3 0.333 22.5 |l 0.326 21.7 0.320 20.9 0.313 20.2 0.306 19.4 Mean Horizontal Difference of Force of Vapor for each 0°.l = 0.0013. B 70 PSYCHROMETRICAL TABLES. 22 Temperature, Fahrenheit. — Force of Vapor in English Inches. — Relative Humidity in Hundredths. t — t', or Difference of Wet and Dry Bulb Thermometers. Wet- ! Bulb Thermo- Vertical HfTerence 240.0 240.5 250.0 250.5 260.0 26°.5 meter of Force £J if Vapor Fahren- for caxih Rela- Rela- Rela- Rela- Rela- Rela- heit. 0°»1« tive tive tive tive tive tive Force of Hu- Force of Hu- Force of Hu- force of Hu- Force of Hu- Force of Hu- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- Vapor. mid- ity. ity. ity. ity. ity ity. 0 Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng In. 68 0.0024 0.363 24.2 0.356 23.3 0.349 22.5 0.342 21.8 0.336 21.8 0.329 20.3 69 .0024 0.386 24.9 0.379 24.1 0.373 23.3 0.366 22.6 0.359 21.8 0.352 21.1 70 .0025 0.410 25.7 0.403 24.9 0.397 24.1 0.390 23.3 0.333 22.6 0.377 21.9 71 .00-26 0.435 26.4 0.428 25.6 0.422 24.9 0.415 24.1 0.408 23.3 0.402 22.6 72 0.461 27.2 0.454 26.4 0.448 25.6 0.441 24.8 0.434 24.1 0.427 23.3 .0027 73 .0028 0.488 27.9 0.481 27.1 0.474 26.3 0.467 25.5 0.461 24.8 0.454 24.0 74 .0028 0.515 28.5 0.508 27.7 0.502 27.0 0.495 26.2 0.488 25.5 0.481 24.7 75 .0029 0.543 29.2 0.537 28.4 0.530 27.6 0.523 26.8 0.516 26.1 0.510 25.4 76 .0030 0.572 29.8 0.566 29.1 0.559 28.3 0.552 27.4 0.545 26.8 0.539 26.1 77 0.602 30.5 0.595 29.7 0.589 28.9 0.582 28.0 0.575 27.4 0.568 26.7 .0031 78 .0032 0.633 31.1 0.626 30.3 0.619 29.5 0.613 28.7 0.606 28.0 0.599 27.3 79 .0033 0.665 31.7 0.658 30.9 0.651 30.1 0.644 29.3 0.638 28.6 0.631 27.9 80 .0034 0.697 32.3 0.691 31.5 0.684 30.7 0.677 29.9 0.670 29.2 0.663 28.5 81 .0035 0.731 32.8 0.724 32.1 0.717 31.3 0.711 30.5 0.704 29.8 0.697 29.1 82 0.766 33.4 0.759 32.6 0.752 31.8 0.745 31.0 0.738 30.4 0.732 29.7 83 0.801 33.9 0.795 33.2 0.788 32.4 0.781 31.6 0.774 30.9 0.767 30.2 84 .0037 0.838 34.5 0.831 33.7 0.824 32.9 0.818 32.1 0.811 31.5 0.804 30.7 85 .0038 0.876 35.0 0.869 34.2 0.862 33.4 0.855 32.7 0.848 32.0 0.842 31.3 86 .0039 0.914 35.5 0.908 34.7 0.901 33.9 0.894 33.2 0.887 32.5 0.880 31.8 87 .0040 0.954 36.0 0.947 35.2 0.940 34.4 0.934 33.7 0.927 33.0 0.920 32.3 .0041 88 0.995 36.4 0.988 35.7 0.981 34.9 0.975 34.2 0.968 33.5 0.961 32.8 89 .0042 1.037 36.9 1.030 36.1 1.024 35.4 1.017 34.7 .010 33.9 .003 33.2 90 .0044 1.081 37.4 1.074 36.6 1.067 35.8 1.060 35.1 .053 34.4 .046 33.7 91 .0045 1.125 37.8 1.118 37.1 1.112 36.3 1.105 35.6 .098 34.9 .091 34.2 92 .0046 1.171 38.2 1.164 37.5 1.157 36.7 1.151 36.0 .144 35.3 .137 84.6 .0048 93 1.218 38.7 1.211 37.9 1.205 37.1 1.198 36.5 .191 35.7 .184 35.0 94 .0049 1.267 39.1 1.260 38.3 1.253 37.5 1.246 36.9 .239 36.2 .232 35.5 95 .0050 1.316 39.5 1.309 38.7 1.302 37.9 1.296 37.3 .289 36.6 .282 35.9 96 .0051 1.367 39.9 1.360 39.1 1.353 38.3 1.346 37.7 .840 37.0 .333 36.3 97 .0053 1.420 40.3 1.413 39.5 1.406 38.7 1.399 38.1 .392 37.4 .385 36.7 98 .0054 1.473 40.7 1.467 39.9 1.460 39.1 1.453 38.5 1.446 37.8 .439 37.1 .0056 99 1.529 41.1 1.522 40.3 1.515 39.5 1.508 38.9 1.501 38.2 .494 37.5 100 .0057 1.586 41.4 1.579 40.7 1.572 39.9 1.565 39.2 1.558 38.5 .551 37.9 101 .0059 1.644 41.8 1.637 41.0 1.630 40.3 1.623 39.6 1.616 38.9 .609 38.2 102 .0060 1.704 42.2 1.697 41.4 1.690 40.7 1.683 40.0 1.676 39.3 .669 38.6 103 .0062 1.765 42.5 1.758 41.8 1.751 41.0 1.745 40.3 1.738 39.6 .731 38.9 104 .0063 1.828 42.8 1.821 42.1 1.814 41.4 1.807 40.7 1.800 40.0 .793 39.3 Mean Horizontal Difference of Force of Taper for each 0°.l = 0.0013. 71 PSYCHXOMETRICAL TABLES. Correction for Barometrical Height above or below the Normal Height of 29.7 inches. Difference of Thermometers, or t — t' Fahrenheit. For Btirointst- rical Height. 2° 4° 6° 8° 10° 12° 14° 16° 18° 20° 22° 24° 26° Wet Bulb above the freezing-Point. Eng. In. Inch. Inch. Inch. Inch. Inch. Inch. Inch. Inch. Inch. Inch. Inch. Inch. Inch. 31.0 -.001 -.002 -.003 -.005 -.006 -.007 -.008 -.009 -.010 -.012 -.013 -.014 -.015 30.5 .001 .001 .002 .003 .004 .004 .005 .006 .006 .007 .008 .009 .009 30.0 -.000 -.000 -.001 -.001 -.001 -.002 -.002 -.002 -.002 -.003 -.003 -.003 -.004 29.5 +.000 +.000 + .001 +.001 +.001 +.001 +.001 +.001 +.002 +.002 +.002 +.002 +.002 29.0 .001 .001 .002 .003 .003 .004 .004 .005 .006 .006 .007 .008 .008 23.5 .001 .002 .003 .004 .005 .006 .007 .009 .010 .011 .012 .013 .014 28.0 .001 .003 .005 .006 .008 .009 .011 .012 .014 .015 .017 .018 .020 27.5 .002 .004 .006 .007 .010 .012 .014 .016 .018 .020 .022 .024 .026 27.0 .002 .005 .007 .009 012 .014 .017 .019 .022 .024 .027 .029 .031 26.5 .003 .006 .008 .011 .014 .017 .020 .023 .026 .029 .031 .034 .037 26.0 .003 .006 .010 .013 .016 .020 .023 .026 .030 .033 .036 .040 .043 25.5 .004 .007 .011 .014 .019 .022 .025 .030 .034 .037 .041 .045 .049 25.0 .004 .008 .012 .016 .021 .025 .028 .033 .038 .042 .046 .050 .055 24.0 .005 .010 .015 .020 .025 .030 .034 .040 .046 .051 .056 .061 .066 23.0 .006 .012 .018 .023 .030 .035 .041 .047 .054 .060 .066 .072 .078 22.0 .007 .013 .020 .027 .034 .041 .047 .054 .062 .069 .076 .083 .090 21.0 .003 .015 .023 .030 .038 .046 .053 .062 .070 .077 .085 .093 .101 20.0 +.008 +.017 f.026 +.034 +.043 +.051 +.059 +.069 +.078 +.086 +.095 +.104 +.113 U'et Bulb below the Freezing-Point. EXAMPLE OF CALCULATION. 31.0 -.001 -.002 -.003 -.004 -.006 Wet Bulb above the Freezing-Point. 30.5 .001 .001 .002 .003 .003 f = 62° F. t — t' = 10°. Barom. = 26.5 in. 30.0 -.000 -.000 -.001 -.001 -.001 The large tables give for a mean baro- 29.5 +.000 +.000 +.000 +.001 +.001 metrical height of 27.9 inches. Force of inch, 29.0 .001 .001 .002 .002 .003 Vapor — 0.403 28.5 .001 .002 .003 .004 .005 Additive correction, in this table, for B = 26.5 inches, and 10° = 0.014 23.0 27.5 .001 .002 .003 .003 .004 .005 .005 .007 .007 .009 Corrected Force of Vapor . = 0.417 27.0 26.5 26.0 .002 .002 .003 .004 .005 .006 .006 .007 .009 .008 .010 .012 .011 .013 .014 The mean barometrical pressure, at a given place of observation, being known, the above Psychro- metrical Tables may be fitted for that place, by 25.5 .003 .007 .010 .013 '.016 determining, by means of this table, a constant cor- rection, to be applied to the numbers in the tables, 25.0 .003 .007 .011 .015 .018 expressing the force of vapor. This correction will 24.0 .004 .009 .013 .018 .022 be found by taking for t — t', or the difference of 23.0 .005 .010 .016 .021 .026 thermometers, a mean value, representing the mean ' 22.0 .006 .012 .018 .024 .030 moisture of the air. The errors arising from the 21.0 .006 .014 .020 .027 .034 deviations from that mean will little impair the 20.0 +.007 +.015 +.023 + .030 +.03S accuracy of the results. B TABLE VIII. FOR DEDUCING THE RELATIVE HUMIDITY OF THE AIR FROM THE INDICATIONS, IN ENGLISH MEASURES, OF THE DEW-POINT INSTRUMENTS. THE object of every Dew-Point instrument is to ascertain, by causing a part of the apparatus to cool, the temperature at which the vapor contained in the air begins to condense, in the shape of light dew, on the cooled portion of the instrument. It is obvious that this is the temperature at which the atmosphere itself, if cooled likewise, would be fully saturated by the amount of vapor present in the air at the time of the observation. The temperature of the dew-point being known, all the hygrometrical conditions of the air can be easily deduced from it The Absolute Humidity, or the total amount of vapor in the atmosphere, is ex- pressed by the number, in the Tables of Elastic Forces of Vapor, due to that temper- ature. The Relative Humidity, or the degree of moisture, being the ratio of the quantity of vapor actually contained in the air to the quantity it could contain if fully saturated, is expressed by the proportion Relative Humidity : 1 : : Force of Vapor at Dew-Point : Maximum Force of Vapor. Calling the Force of Vapor at the Temperature of the Dew-Point, f\ Force of Vapor at the Temperature of the Air, F ; then Relative Humidity = £. It is thus found by dividing the force of vapor due, in the Table of Elastic Forces, to the temperature of the dew-point, by the maximum of the force of vapor due, in the same table, to the temperature of the air at the time of the observation. F being always greater than f, when the air is not saturated, the Relative Humidity is ex- pressed by a fraction, which is termed the fraction of saturation. Making the point of saturation = 100, in order to obtain this fraction in hundredths, we have Relative Humidity = /xF1Q0. B 73 FOR DEDUCING THE RELATIVE HUMIDITY OF THE AIR. Example. Suppose the Temperature of the Air, or t, to be — 43° F. Temperature of the Dew-Point, or f, to be = 35° F. Difference between the two, or t — t', to be = 8° F. Taking in Table VI. the Elastic Forces due to t and f, we have = -I*™ = '3-4, Relative Humidity in Hundredth. The following Table VIII. gives, in hundredths, the fraction of saturation, or Rel- ative Humidity, corresponding to each degree of t', or of the temperature of the air, from 0° to 104° ; and for every half degree of t — t', or of the difference between the temperature of the air and of the dew-point, from 0.°5 to 24.°5. Regnault's Table of Elastic Forces of Vapor, reduced to English measures, has been used in the computation. Though the fraction of saturation expressed in hundredths indicates the Relative Humidity with sufficient accuracy, the thousandths have been added to facilitate, as remarked above in the preface to the Psychrometrical Tables, the interpolations for any number falling between those given in the table. USE OF THE TABLE. Example. Temperature of Air, or t, being = 62° F. Temperature of the Dew-Point, or t', = 53° F. Difference, or t — t', = 9° F. Find out the Relative Humidity. In the column of temperatures, the first on the left, find 62° ; on the same horizon- tal line, in the column headed 9°, is found 72.4, which is the Relative Humidity required. Should it seem desirable to compute the Relative Humidity for values of t — t' not contained in the table, the factors given below in Table IX. may be used. It may be seen, however, that an interpolation at sight will always suffice for meteo- rological purposes. B 74 VIII. FOR DEDUCING THE RELATIVE HUMIDITY OF THE AIR, FROM THE INDICATIONS OF DEW-POINT INSTRUMENTS. Relative Humidity expressed in Hundredths, full Saturation being = 100. Temper- t — t' = Difference of Temperatures of the Air and of the Dew-Point. — Fahrenheit. ature of Air, Fahren- heit. O.O 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 0° 100. 97.7 95.4 93.2 91.0 88.9 86.8 84.8 82.8 80.9 1 100. 97.7 95.5 93.3 91.1 89.0 86.9 84.9 82.9 81.0 2 100. 97.7 95.5 93.3 91.2 89.1 87.0 85.0 83.0 81.1 3 100. 97.8 95.5 93.4 91.2 89.2 87.1 85.1 83.1 81.2 4 100. 97.8 95.6 93.4 91.3 89.2 87.2 85.2 83.2 81.3% 5 100. 97.8 95.6 93.5 91.4 89.3 87.3 85.3 83.3 81.4 6 100. 97.8 95.6 93.5 91.4 89.3 87.3 85.3 83.3 81.5 7 100. 97.8 95.6 93.5 91.4 89.3 87.3 85.3 83.4 81.5 8 100. 97.8 95.6 93.5 91.3 89.3 87.3 85.3 83.4 81.5 9 100. 97.8 95.6 93.5 91.3 89.3 87.3 85.3 83.4 81.5 10 100. 97.8 95.6 93.4 91.3 89.3 87.3 85.3 83.4 81.5 11 100. 97.8 95.6 93.4 91.3 89.3 87.3 85.3 83.4 81.6 12 100. 97.8 95.5 93.4 91.3 89.3 87.3 85.4 83.4 81.6 13 100. 97.8 95.5 93.4 91.3 89.3 87.3 85.4 83.5 81.6 14 100. 97.7 95.5 93.4 91.3 89.3 87.3 85.4 83.5 81.7 15 100. 97.7 95.5 93.4 91.3 89.4 87.4 85.5 83.5 81.7 16 100. 97.7 95.5 93.4 91.3 89.3 87.3 85.4 83.5 81.6 17 100. 97.7 95.5 93.4 91.3 89.3 87.3 85.3 83.4 81.6 18 100. 97.7 95.5 93.4 91.3 89.3 87.3 85.3 83.4 81.5 19 100. 97.8 95.5 93.4 91.3 89.3 87.2 85.2 83.3 81.4 o.o 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 RELATIVE HUMIDITY FROM THE TEMPERATURE OF THE DEW-POINT. Temper- ature of Air, Fahren- heit. t — t' = Difference of Temperatures of the Air and of the Dew-Point. — Fahrenheit. 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 0° 79.0 77.2 75.4 73.6 71.9 70.1 68.5 66.9 65.3 63.7 1 79.1 77.3 75.5 73.7 72.0 70.2 68.6 67.0 65.4 63.8 2 79.2 77.4 75.6 73.8 72.1 70.3 68.7 67.1 65.5 64.0 3 79.3 77.5 75.7 73.9 72.2 70.5 68.8 67.2 65.6 64.1 4 79.4 77.6 75.8 74.0 72.3 70.6 68.9 67.3 65.7 64.2 5 79.5 77.7 75.9 74.1 72.4 70.7 69.1 67.4 65.8 64.4 6 79.6 77.8 76.0 74.2 72.5 70.8 69.2 67.6 66.0 64.5 7 79.6 77.8 76.0 74.3 72.6 70.9 69.3 67.7 66.1 64.6 8 79.6 77.9 76.1 74.4 72.7 71.0 69.4 67.8 66.2 64.7 9 79.7 77.9 76.1 74.4 72.7 71.1 69.5 67.9 66.3 64.8 10 79.7 77.9 76.2 74.5 72.8 71.2 69.6 68.0 66.4 64.9 11 79.7 78.0 76.2 74.5 72.8 71.2 69.6 68.0 66.5 64.9 12 79.8 78.0 76.2 74.5 72.9 71.2 69.6 68.0 66.5 65.0 13 79.8 78.0 76.3 74.6 72.9 71.3 69.6 68.1 66.5 65.0 14 79.8 78.1 76.3 74.6 72.9 71.3 69.6 68.1 66.5 65.1 15 79.8 78.1 76.3 74.6 72.9 71.3 69.7 68.1 66.6 65.1 16 79.8 78.0 76.2 74.5 72.9 71.2 69.6 68.1 66.5 65.1 17 79.7 77.9 76.1 74.5 72.8 71.2 69.6 68.0 66.5 65.0 18 79.6 77.8 76.1 74.4 72.7 71.1 69.5 68.0 66.5 65.0 19 0° 79.6 77.8 76.0 74.3 72.7 71.1 69.5 68.0 66.4 65.0 10.0 10.5 11.0 11.5 12.0 12.5 13.0 13.5 14.0 14.5 62.1 60.7 59.2 57.7 56.3 54.9 53.6 52.3 51.0 49.8 1 62.3 60.8 59.3 57.9 56.5 55.1 53.7 52.5 51.2 50.0 2 62.4 61.0 59.5 58.1 56.6 55.3 53.9 52.7 51.4 50.1 3 62.6 61.1 59.6 58.2 56.8 55.5 54.1 52.8 51.5 50.3 4 62.7 61.3 59.8 58.4 57.0 55.7 54.3 53.0 51.7 50.5 5 62.9 61.4 60.0 58.6 57.2 55.8 54.5 53.2 51.9 50.7 . 6 63.0 61.5 60.1 58.7 57.3 55.9 54.6 53.3 52.0 50.8 7 63.1 61.7 60.2 58.8 57.4 56.0 54.7 53.4 52.1 50.9 8 63.2 61.8 60.3 58.9 57.5 56.2 54.8 53.5 52.3 51.0 9 63.3 61.9 60.4 59.0 57.6 56.3 54.9 53.6 52.4 51.2 10 63.4 62.1 60.5 59.1 57.7 56.4 55.0 53.8 52.5 51.3 11 63.5 62.1 60.6 59.2 57.8 56.5 55.1 53.9 52.6 51.4 12 63.5 62.1 60.6 59.3 57.9 56.6 55.2 54.0 52.7 51.5 13 63.5 62 2 60.7 59.3 58.0 56.6 55.3 54.1 52.8 51.6 14 63.6 62.3 60.8 59.4 58.1 56.7 55.4 54.2 52.9 51.7 15 63.6 62.3 60.8 59.5 58.1 56.8 55.5 54.3 53.0 51.S 16 63.6 62.3 60.8 59.5 58.1 56.8 65.5 54.3 53.0 51.8 17 63.6 62.2 60.8 59.4 58.1 56.7 55.5 54.2 53.0 51.8 18 63.5 62.2 60.7 59.4 58.0 56.7 55.4 54.2 53.0 51.8 19 63.5 62.1 60.7 59.3 58.0 56.6 55.4 54.2 52.9 51.8 76 RELATIVE HUMIDITY FROM THE TEMPERATURE OF THE DEW-POINT. Temper- t — t' = Difference of Temperatures of the Air and of the Dew-Point. — Fahrenheit. ature of Air, Fahren- heit. 15.O 15.5 16.O 16.5 17.0 17.5 18.0 1S.5 19.0 19.5 0° 48.5 47.3 46.1 45.0 43.9 42.8 41.6 40.6 39.5 38.5 1 48.7 47.5 46.3 45.2 44.0 42.9 41.8 40.8 39.7 38.7 2 48.9 47.7 46.5 45.4 44.2 43.1 42.0 41.0 39.9 38.9 3 49.1 47.9 46.7 45.5 44.4 43.3 42.2 41.2 40.2 39.2 4 49.3 48.1 46.9 45.7 44.6 43.5 42.4 41.4 40.4 39.4 5 49.4 48.2 47.1 45.9 44.8 43.7 42.6 41.6 40.6 39.6 6 49.6 48.4 47.2 46.1 44.9 43.9 42.8 *41.8 40.7 39.8 7 49.7 48.5 47.3 46.2 45.1 44.0 42.9 41.9 40.9 39.9 8 49.8 48.7 47.5 46.4 45.3 44.2 43.1 42.1 41.1 40.1 9 50.0 48.8 47.6 46.5 45.4 44.3 43.3 42.2 41.2 40.2 10 50.1 48.9 47.8 46.7 45.6 44.5 43.4 42.4 41.4 40.4 11 50.2 49.0 47.9 46.8 45.7 44.6 43.5 42.5 41.5 40.5 12 50.3 49.1 48.0 46.9 45.8 44.7 43.6 42.6 41.6 40.6 13 50.4 49.2 48.1 47.0 45.9 44.8 43.7 42.7 41.7 40.7 14 50.5 49.3 48.2 47.1 46.0 44.9 43.8 42.8 41.8 40.8 15 50.6 49.4 48.3 47.2 46.1 45.0 43.9 42.9 41.9 40.9 16 50.6 49.5 48.3 47.2 46.1 45.0 44.0 43.0 41.9 41.0 17 50.6 49.5 - 48.3 47.2 46.1 45.0 44.0 43.0 42.0 41.0 18 50.6 49.5 48.3 47.2 46.2 45.0 44.1 43.1 42.0 41.1 19 50.6 49.5 48.3 47.3 46.2 45.1 44.1 43.1 42.1 41.1 2O.O 20.5 21.0 21.5 22.O 22.5 23.0 23.5 24.0 24.5 0° 37.5 36.5 35.5 34.6 33.7 32.8 31.9 31.0 30.2 29.3 1 37.7 36.8 35.8 34.8 33.9 33.0 32.1 31.3 30.4 29.6 2 37.9 37.0 36.0 35.1 34.2 33.3 32.4 31.5 30.7 29.9 3 38.2 37.2 36.2 35.3 34.4 33.5 32.6 31.8 30.9 30.1 4 38.4 37.4 36.5 35.6 34.6 33.8 32.9 32.0 31.2 30.4 5 38.6 37.7 36.7 35.8 34.9 34.0 33.1 32.3 31.4 30.6 6 38.8 37.8 36.9 36.0 35.0 34.2 33.3 32.5 31.6 30.8 7 38.9 38.0 37.0 36.1 35.2 34.3 33.5 32.6 31.8 31.0 8 39.1 38.1 37.2 36.3 35.4 34.5 33.6 32.8 32.1 31.2 9 39.2 38.3 37.3 36.4 35.5 34.7 33.8 33.0 32.3 31.4 10 39.4 38.4 37,5 36.6 35.7 34.8 34.0 33.1 32.5 31.6 11 39.5 38.6 37.6 36.7 35.8 35.0 34.1 33.3 32.6 31.7 12 39.6 38. 7 37.8 36.9 36.0 35.1 34.2 33.4 32.7 31.8 13 39.8 38.8 37.9 37.0 36.1 35.2 34.4 33.6 32.8 32.0 14 39.9 39.0 38.0 37.1 36.2 35.4 34.5 33.7 32.9 32.1 15 40.0 39.1 38.2 37.3 36.4 35.5 34.7 33.9 33.0 32.2 16 40.0 39.1 38.2 37.3 36.4 35.6 34.7 33.9 33.1 32.3 17 40.1 39.2 38.2 37.4 36.5 35.6 34.8 34.0 33.1 32.4 18 40.1 39.2 38.3 37.4 36.5 35.7 34.8 34.0 33.2 32.4 19 40.2 39.3 38.3 37.5 36.6 35.7 34.9 34.1 33.2 325 77 RELATIVE HUMIDITY FROM THE TEMPERATURE OF THE DEW-POINT. Temper- ature of Air, Fahren- heit. t — tf = Difference of Temperatures of the Air and of the Dew-Point. — Fahrenheit. 0.0 0.5 1.0 1.5 2.0 2.5 3.O 3.5 4.0 4.5 S1.3 20° 100. 97.8 95.6 93.4 91.3 89.2 87.2 85.2 83.2 21 100. 97.8 95.6 93.4 91.3 89.3 87.3 85.3 83.3 81.5 22 100. 97.8 95.6 93.5 91.4 89.3 87.3 85.4 83.4 81.6 23 100. 97.8 95.6 93.5 91.4 89.4 87.4 85.5 83.5 81.7 24 100. 97.8 95.7 93.5 91.5 89.5 87.5 85.5 83.6 81.8 25 100. 97.8 . 95.7 93.6 91.5 89.5 87.6 85.6 83.7 81.9 26 100. 97.8 95.7 93.6 91.6 89.6 87.7 85.7 83.8 82.0 27 100. 97.9 95.8 93.7 91.7 89.7 87.8 85.9 84.0 82.1 28 100. 97.9 95.8 93.8 91.8 89.8 87.9 86.0 84.1 82.3 29 100. 97.9 95.9 93.8 91.8 89.9 88.0 86.1 84.2 82.4 30 100. 97.9 95.9 93.9 91.9 90.0 88.1 86.2 84.3 82.5 31 100. 98.0 96.0 94.0 92.0 90.1 88.2 86.4 84.5 82.7 32 100. 98.0 96.0 94.0 92.1 90.2 88.4 86.6 84.7 83.0 33 100. 98.0 96.1 94.1 92.2 90.4 88.6 86.7 84.9 S3.2 34 100. 98.0 96.1 94.2 92.3 90.5 88.7 86.9 85.1 83.4 35 100. 98.0 96.1 94.3 92.4 90.6 88.9 87.1 85.3 83.6 36 100. 98. 96.2 94.3 92.5 90.7 88.9 87.1 85.4 83.7 37 100. 98. 96.2 94.3 92.5 90.7 88.9 87.2 85.4 83.7 38 100. 98. 96.2 94.3 92.5 90.7 89.0 87.2 85.5 83.8 39 100. 98. 96.2 94.3 92.5 90.7 89.0 87.2 85.5 83.9 40 100. 98. 96.2 94.4 92.5 90.8 89.0 87.3 85.6 83.9 41 100. 98. 96.2 94.4 92.6 90.8 89.1 87.3 85.7 84.0 42 100. 98. 96.2 94.4 92.6 90.8 89.1 87.4 85.7 84.1 43 100. 98. 96.3 94.4 92.6 90.9 89.2 87.5 85.8 84.2 44 100. 98. 96.3 94.5 92.7 90.9 89.2 87.5 85.9 84.2 45 100. 98. 96.3 94.5 92.7 91.0 89.3 87.6 85.9 84.3 46 100. 98. 96.3 • 94.5 92.7 91.0 89.3 87.6 86.0 84.4 47 100. 98.1 96.3 94.5 92.8 91.0 89.3 87.7 86.0 84.4 48 100. 98.2 96.3 94.6 92.8 91.1 89.4 87.7 86.1 84.4 49 100. 98.2 96.4 94.6 92.8 91.1 89.4 87.7 86.1 84.5 50 100. 98.2 96.4 94.6 92.9 91.1 89.4 87.8 86.2 84.5 51 100. 98.2 96.4 94.6 92.9 91.2 89.5 87.8 86.2 84.6 52 100. 98.2 96.4 94.6 92.9 91.2 89.5 87.9 86.3 84.7 53 100. 98.2 96.4 94.7 92.9 91.2 89.6 87.9 86.3 84.7 54 100. 98.2 96.4 94.7 93.0 91.3 89.6 88.0 86.4 84.8 55 100. 98.2 96.5 94.7 93.0 91.3 89.7 88.0 86.4 84.8 56 100. 98.2 96.5 94.7 93.0 91.4 89.7 88.1 86.5 84.9 57 100. 98.2 96.5 94.8 93.1 91.4 89.7 88.1 86.5 85.0 58 100. 98.2 96.5 94.8 93.1 91.4 89.8 88.2 86.6 85.0 59 100. 98.2 96.5 94.8 93.1 91.5 89.8 88.2 86.6 85.1 60 100. 98.2 96.5 94.8 93.2 91.5 89.9 88.3 86.7 85.1 61 100. 98.3 96.5 94.9 93.2 91.5 89.9 88.3 86.7 85.2 62 100. 98.3 96.6 94.9 93.2 91.6 90.0 88.4 86.8 85.3 o.o 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 B 78 RELATIVE HUMIDITY FROM THE TEMPERATURE OF THE DEW-POINT. Temper- ature of Air, Fahren- heit. t — t' = Difference of Temperatures of the Air and of the Dew-point. — Fahrenheit. 0.0 0.5 1.0 1.5 2.0 2.5 3.O 3.5 4.0 4.5 62° 100. 98.3 96.6 94.9 93.2 91.6 90.0 88.4 86.8 85.3 63 100. 98.3 96.6 94.9 93.2 91.6 90.0 88.4 86.8 85.3 64 100. 98.3 96.6 94.9 93.3 91.6 90.0 88.5 86.9 85.3 65 100. 98.3 96.6 94.9 93.3 91.7 90.1 88.5 86.9 85.4 66 100. 98.3 96.6 94.9 93.3 91.7 90.1 88.5 87.0 85.4 67 100. 98.3 96.6 95.0 93.3 91.7 90.1 88.6 87.0 85.5 6S 100. 98.3 96.6 95.0 93.4 91.8 90.2 88.6 87.1 85.5 69 100. 98.3. 96.6 95.0 93.4 91.8 90.2 88.7 8T.2 85.6 70 100. 98.3 96.7 95.0 93.4 91.8 90.3 88.7 87.2 85.7 71 100. 98.3 96.7 95.0 93.4 91.9 90.3 88.8 87.2 85.8 72 100. 98.3 96.7 95.1 93.5 91.9 90.3 88.8 87.3 85.8 73 100. 98.3 96.7 95.1 93.5 91.9 90.4 88.8 87.3 85.9 74 100. 98.3 96.7 95.1 93.5 91.9 90.4 88.9 87.4 85.9 75 100. 98.3 96.7 95.1 93.5 92.0 90.4 88.9 87.4 86.0 76 100. 98.3 96.7 95.1 93.6 92.0 90.5 89.0 87.5 86.0 77 100. 98.4 96.7 95.2 93.6 92.0 90-5 89.0 87.5 86.1 73 100. 98.4 96.7 95.2 93.6 92.1 90.5 89.1 87.6 86.1 79 100. 93.4 96.8 95.2 93.6 92.1 90.6 89.1 87.6 86.2 80 100. 93.4 96.8 95.2 93.6 92.1 90.6 89.1 87.7 862 81 100. 98.4 96.8 95.2 93.7 92.1 90.6 89.2 87.7 86.3 82 100. 93.4 9S.8 95.2 93.7 92.2 90.7 89.2 87.8 86.3 83 100. 98.4 96.8 95.3 93.7 92.2 90.7 89.3 87.8 86.4 84 100. 98.4 96.8 95.3 93.7 92.2 90.8 89.3 87.8 86.4 85 100. 98.4 96.8 95.3 93.8 92.3 90.8 89.3 87.9 86.5 86 100. 98.4 96.8 95.3 93.8 92.3 90.8 89.4 87.9 86.5 87 100. 98.4 96.9 95.3 93.8 92.3 90.9 89.4 88.0 86.6 88 100. 98.4 96.9 95.3 93.8 92.3 90.9 89.4 88.0 86.6 89 100. 98.4 96.9 95.4 93.9 92.4 90.9 89.5 88.1 86.7 90 10D. 93.4 96.9 95.4 93.9 92.4 91.0 89.5 88.1 86.7 91 100. 9S.4 96.9 95.4 93.9 92.4 91.0 89.6 88.2 86.8 92 100. 98.5 96.9 95.4 93.9 92.5 91.0 89.6 88.2 86.8 93 100. 98.5 96.9 95.4 93.9 92.5 91.1 89.6 88.2 86.9 94 100. 98.5 96.9 95.4 94.0 92.5 91.1 89.7 88.3 86.9 95 100. 98.5 97.0 95.5 94.0 92.5 91.1 89.7 88.3 87.0 93 100. 98.5 97.0 95.5 94.0 92.6 91.2 89.7 88.4 87.0 97 100. 98.5 97.0 95.5 94.0 92.6 91.2 89.8 88.4 8V> 93 100. 98.5 97.0 95.5 94.1 92.6 91.2 89.8 88.4 87.1 99 100. 98.5 97.0 95.5 94.1 92.7 91.3 89.9 88.5 87.1 100 100. 98.5 97.0 95.6 94.1 92.7 91.3 89.9 88.5 87.2 101 100. 98.5 97.0 95.6 94.1 92.7 91.3 89.9 88.6 87.2 102 100. 98.5 97.0 95.6 94.2 92.7 91.4 90.0 88.6 87.3 103 100. 98.5 97.0 95.6 94.2 92.8 91.4 90.0 88.7 87.3 104 100. 9S.5 97.0 95.6 94.2 92.8 91.4 90.0 88.7 87.4 o.o 0.5 1.0 1.5 2.0 2.5 3.O 3.5 4.0 4.5 79 RELATIVE HUMIDITY FROM THE TEMPERATURE OF THE DEW-POINT. Temper- ature of Air, Fahren- heit. t — t' = Difference of Temperatures of the Air and of the Dew-Point. — Fahrenheit. 5.0 5.5 6.0 6.5 *.o 7.5 8.0 8.5 9.0 9.5 20° 79.5 77.7 75.9 74.2 72.6 71.0 69.4 67.9 66.4 64.9 21 79.6 77.8 76.0 74.3 72.7 71.1 69.5 68.0 66.4 65.0 22 79.7 77.9 76.1 74.4 72.8 71.2 69.6 68.0 66.5 65.0 23 79.8 78.0 76.2 74.6 72.9 71.3 69.6 68.1 66.5 65.0 24 79.9 78.1 76.4 74.7 73.0 71.4 69.7 68.1 66.6 65.1 25 80.0 78.2 76.5 74.8 73.1 71.5 69.8 68.2 66.6 65.1 26 80.2 78.4 76.6 74.9 73.2 71.7 70.0 68.4 66.8 65.3 27 80.3 78.5 76.8 75.1 73.4 71.8 70.1 68.6 67sO 65.5 28 80.5 78.7 76.9 75.2 73.6 72.0 70.3 ' 68.8 67.2 65.7 29 80.6 78.8 77.1 75.4 73.7 72.1 70.5 68.9 67.4 65.9 30 80.7 78.9 77.2 75.6 73.9 72.3 70.7 69.1 67.6 66.1 31 81.0 79.2 77.5 75.8 74.2 72.6 71.0 69.4 67.9 66.4 32 81.2 79.4 77.7 76.1 74.4 72.8 71.3 69.7 68.2 66.7 33 81.4 79.7 78.0 76.4 74.7 73.1 71.5 70.0 68.5 67.0 34 81.7 79.9 78.3 .76.6 75.0 73.4 71.8 70.3 68.8 67.3 35 81.9 80.2 78.5 76.9 75.3 73.7 72.1 70.6 69.1 67.6 36 82.0 80.3 78.6 77.0 75.4 73.9 72.3 70.8 69.3 67.8 37 82.0 80.4 78.8 77.2 75.6 74.0 72.5 71.0 69.5 C8.1 38 82.1 80.5 78.9 77.3 75.8 74.2 72.7 71.2 69.8 68.3 39 82.2 80.6 79.0 77.4 75.9 74.4 72.9 71.5 70.0 68.6 40 82.3 80.7 79.1 77.6 76.1 74.6 73.2 71.7 70.2 68.8 41 82.4 80.8 79.2 77.7 76.2 74.7 73.2 71.8 • 70.3 68.9 42 82.5 80.9 79.3 77.8 76.3 74.8 73.3 71.9 70.5 69.0 43 82.5 80.9. 79.4 77.9 76.4 74.9 73.4 72.0 70.6 69.2 44 82.6 81.0 79.5 78.0 76.5 75.0 73.5 72.1 70.7 69.3 45 82.7 81.1 79.6 78.0 76.5 75.1 73.6 72.2 70.8 69.4 46 82.8 81.2 79.6 78.1 76.6- 75.1 73.7 72.3 70.9 69.5 47 82.8 81.2 79.7 78.2 76.7 75.2 73.8 72.4 71.0 69.6 48 82.9 81.3 79.8 ~78.2 76.8 75.3 73.9 72.5 7*1 69.7 49 82.9 81.3 79.8 78.3 76.8 75.4 74.0 72.6 71.2 69.8 50 83.0 81.4 79.9 78.4 76.9 75.5 74.0 72.7 71.3 69.9 51 83.0 81.5 80.0 78.5 77.0 75.5 74.1 72.8 71.4 70.0 52 83.1 81.5 80.0 78.5 77.1 75.6 74.2 72.8 71.5 70.1 53 83.2 81.6 80.1 78.6 77.2 75.7 74.3 72.9 71.6 70.2 54 83.2 81.7 80.2 78.7 77.2 75.8 74.4 73.0 71.7 70.3 5.5 56 83.3 83.4 81.8 81.8 80.3 80.3 78.8 78.9 77.3 77.4 75.9 76.0 74.5 74.6 73.1 73.2 71.8 71.9 70.4 70.5 57 83.4 81.9 80.4 78.9 77.5 76.1 74.7 73.3 72.0 70.6 58 83.5 82.0 80.5 79.0 77.6 76.2 74.8 73.4 72.1 70.7 59 83.6 82.0 80.6 79.1 77.7 76.2 74.9 73.5 72.2 70.9 60 83.6 82.1 80.6 79.2 77.7 76.3 75.0 73.6 72.3 71.0 61 62 83.7 83.7 82.2 82.2 80.7 80.8 79.2 79.3 77.8 77.9 76.4 76.5 75.0 75.1 73.7 73.8 72.4 72.4 71.0 71.1 5.0 5.5 G.O 6.5 •7.0 •7.5 8.O 8.5 0.0 9.5 B 80 RELATIVE HUMIDITY FROM THE TEMPERATURE OF THE DEW-POINT. ' Temper- t — t' = Difference of Temperatures of the Air and of the Dew-Point. — Fahrenheit. ! ature of Air, Fahren- heit. 5.0 5.5 6.O 6.5 7.0 7.5 8.0 8.5 9.O 9.5 62° 83.7 82.2 80.8 79.3 77.9 76.5 75.1 73.8 72.4 71.1 63 83.8 82.3 80.8 79.4 78.0 76.6 75.2 73.9 72.5 71.2 64 83.9 82.4 80.9 79.5 78.1 76.7 75.3 74.0 72.6 71.3 65 83.9 82.4 81.0 79.6 78.1 76.8 75.4 74.0 72.7 71.4 66 84.0 82.5 81.1 79.6 78.2 76.8 75.5 74.1 72.8 71.5 67 84.0 82.6 81.1 79.7 78.3 76.9 75.6 74.2 72.9 71.6 63 84.1 82.6 81.2 79.8 78.4 77.0 75.7 74.3 73.0 71.7 69 84.2 82.7 81.3 79.9 78.5 77.1 75.7 74.4 73.1 71.8 70 84.2 82.8 81.3 79.9 78.5 77.2 75.8 74.5 73.2 71.9 71 84.3 82.8 81.4 80.0 78.6 77.3 75.9 74.6 73.3 72.0 72 84.3 82.9 81.5 80.1 78.7 77.3 76.0 74.7 73.4 72.1 73 84.4 83.0 81.5 80.1 78.7 77.4 76.1 74.8 73.5 72.2 74 84.5 83.0 81.6 80.2 78.8 77.5 76.2 74.9 73.6 72.3 75 84.5 83.1 81.7 80.3 78.9 77.6 76.2 74.9 73.7 72.4 76 84.6 83.1 81.7 80.4 78.9 77.7 76.3 75.0 73.7 72.5 77 84.6 83.2 81.8 80.4 79.0 77.7 76.4 75.1 73.8 72.6 78 84.7 83.3 81.9 80.5 79.1 77.8 76.5 75.2 73.9 72.7 79 84.7 83.3 81.9 80.6 79.1 77.9 76.6 75.3 74.0 72.8 80 84.8 83.4 82.0 80.6 79.2 78.0 76.7 75.4 74.1 72.9 81 84.9 83.5 82.1 80.7 79.3 78.0 76.7 75.5 74.2 73.0 82 84.9 83.5 82.1 80.8 79.4 78.1 76.8 75.5 74.3 73.0 83 85.0 83.6 82.2 80.8 79.4 78.2 76.9 75.6 74.4 73.1 84 85.0 83.6 82.3 80.9 79.5 78.3 77.0 75.7 74.5 73.2 85 85.1 83.7 82.3 81.0 79.6 78.4 77.1 75.8 74.6 73.3 86 85.1 83.7 82.4 81.1 79.7 78.4 77.1 75.9 74.6 73.4 87 85.2 83.8 82.5 81.1 79.8 78.5 77.2 76.0 74.7 73.5 88 85.2 83.9 82.5 81.2 79.9 78.6 77.3 76.1 74.8 73.6 89 85.3 83.9 82.6 81.3 79.9 78.7 77.4 76.1 74.9 73.7 90 85.3 84.0 82.6 81.3 80.0 78.7 77,5 76.2 75.0 73.8 91 85.4 84.0 82.7 81.4 80.1 78.8 77.5 76.3 75.1 73.9 92 85.4 84.1 82.8 81.5 80.2 78.9 77.6 76.4 75.2 74.0 93 85.5 84.2 82.8 81.5 80.2 79.0 77.7 76.5 75.2 74.0 94 85.6 84.2 82.9 81.6 • 80.3 79.0 77.8 76.6 75.3 74.1 95 85.6 84.3 83.0 81.7 80.4 79.1 77.9 76.6 75.4 74.2 96 85.7 84.3 83.0 81.7 80.4 79.2 77.9 76.7 75.5 74.3 97 85.7 84.4 83.1 81.8 80.5 79.3 78.0 76.8 75.6 74.4 98 85.8 84.4 83.1 81.9 80.6 79.3 78.1 76.9 75.7 74.5 99 85.8 84.5 83.2 81.9 80.7 79.4 78.2 77.0 75.8 74.6 100 85.9 84.6 83.3 82.0 80.7 79.5 78.3 77.0 75.8 74.7 101 85.9 84.6 83.3 82.0 80.8 79.6 78.3 77.1 75.9 74.8 102 86.0 84.7 83.4 82.1 80.9 79.6 78.4 77.2 76.0 74.9 103 86.0 84.7 83.4 82.2 80.9 79.7 78.5 77.3 76.1 74.9 104 86.1 84.8 83.5 82.2 81.0 79.8 78.6 77.4 76.2 75.0 1 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 0.0 9.5 81 RELATIVE HUMIDITY FROM THE TEMPERATURE OF THE DEW-POINT. Temper- ature of Air, Fahren- heit. t — t' = Difference of Temperatures of the Air and of the Dew-Point. —Fahrenheit. 10.0 10.5 11.0 11.5 12.0 12.5 13.O 13.5 14.0 14.5 20° 63.5 62.1 60.6 59.3 58.0 56.6 55.4 54.1 52.9 51.7 21 63.5 62.1 60.7 59.3 58.0 56.6 55.4 54.2 53.0 51.8 22 63.5 62.1 60.7 59.4 58.0 56.7 55.5 54.2 53.0 51.8 23 63.6 62.1 60.7 59.4 58.0 56.7 55.5 54.3 53.0 51.9 24 63.6 62.1 60.7 59.4 58.1 56.8 55.5 54.3 53.1 51.9 25 63.6 62.1 60.7 59.4 58.1 56.8 55.6 54.4 53.1 52.0 26 63.8 62.3 60.9 59.6 58.3 57.0 55.7 54.5 53.3 52.1 27 64.0 62.5 61.1 59.8 58.5 57.2 55.9 54.6 53.4 52.2 28 64.2 62.7 61.3 60.0 58.6 57.3 56.0 54.8 53.5 52.3 29 64.4 63.0 61.5 60.2 58.8 57.5 56.2 54.9 53.7 52.4 30 64.6 63.2 61.8 60.4 59.0 57.7 56.3 55.1 53.8 52.6 31 64-9 63.5 62.1 60.7 59.3 58.0 56.6 55.4 54.1 52.9 32 65.2 63.8 62.4 61.0 59.6 58.3 57.0 55.7 54.4 53.2 33 65.5 64.1 62.7 61.3 59.9 58.6 57.3 56.0 54.7 53.5 34 65.8 64.4 63.0 61.6 60.2 58.9 57.6 56.3 55.0 53.8 33 66.1 64.7 63.3 61.9 60.5 59.2 57.9 56.6 55.4 54.1 36 66.4 64.9 63.5 62.1 60.8 59.5 58.2 56.9 55.6 54.4 37 66.6 65.2 63.8 62.4 61.1 59.8 58.5 57.2 55.9 54.7 33 66.9 65.5 64.1 62.7 61.4 60.1 58.8 57.5 56.2 55.0 39 67.1 65.7 64.4 63.0 61.7 60.3 59.1 57.8 56.5 55.3 40 67.4 66.0 64.6 63.3 62.0 60.6 59.4 58.1 56.8 55.6 41 67.5 66.1 64.8 63.5 62.1 60.9 59.6 58.3 57.1 55.9 42 67.7 66.3 65.0 63.6 62.3 61.1 59.8 58.6 57.3 56.1 43 67.8 66.4 65.1 63.8 62.5 61.3 60.0 58.8 57.6 56.4 44 67.9 66.6 65.3 64.0 62.7 61.5 60.3 59.0 57.8 56.6 45 6S.1 66.7 65.4 64.2 62.9 61.7 60.5 59.3 58.1 56.9 46 63.2 669 65.6 64.3 63.0 61.8 60.6 59.4 58.2 57.0 47 63.3 67.0 65.7 64.4 63.2 61.9 60.7 59.5 58.3 57.2 48 68.4 67.1 65.8 64.5 63.3 62.0 60.8 59.6 58.5 57.3 49 68.5 67.2 65.9 64.6 63.4 62.1 61.0 59.8 58.6 57.4 50 63.6 67.3 66.0 64.7 63.5 62.2 61.1 59.9 58.7 57.6 51 63.7 67.4 66.1 64.9 63.6 62.4 61.2 60.0 58.9 57.7 52 68.8 67.5 66.2 65.0 63.7 62.5 61.3 60.1 59.0 57.8 53 68.9 67.6 66.4 65.1 63.9 62.6 61.4 60.3 59.1 58.0 54 69.0 67.7 66.5 65.2 64.0 62.7 61.6 60.4 59.2 58.1 55 69.1 67.8 66.6 65.3 64.1 62.9 61.7 60.5 59.4 58.2 56 69.2 67.9 66.7 65.4 64.2 63.0 61.8 60.6 59.5 58.4 57 69.3 6S.1 66.8 65.6 64.3 63.1 61.9 60.8 59.6 58.5 58 69.5 68.2 66.9 65.7 64.4 63.2 62.1 60.9 59.8 58.6 59 69.6 68.3 67.0 65.8 64.6 63.4 62.2 61.0 59.9 588 60 69.7 68.4 67.1 65.9 64.7 63.5 62.3 61.2 60.0 58.9 61 69.8 68.5 67.2 66.0 64.8 63.6 62.4 61.3 60.1 59.0 62 69.9 68.6 67.4 66.1 64.9 63.7 62.6 61.4 60.3 59.1 10.0 10.5 11.0 11.5 12.0 12.5 13.0 13.5 14.O 14.5 B RELATIVE HUMIDITY FROM THE TEMPERATURE OF THE DEW-POINT. Temper- ature of Air, Fahren- heit. t — t< = Difference of Temperatures of the Air and of the Dew-Point. —Fahrenheit. 1O.O 10.5 ll.O 11.5 12.O 12.5 13.0 13.5 14.0 14.5 62° 69.9 68.6 67.4 66.1 64.9 63.7 62.6 61.4 60.3 59.1 63 70.0 68.7 67.5 66.2 65.0 63.8 62.7 61.5 60.4 59.3 64 70.1 68.8 67.6 66.3 65.1 64.0 62.8 61.6 60.5 59.4 65 70.2 68.9 67.7 66.5 65.3 64.1 62.9 61.8 60.6 59.5 66 70.3 69.0 67.8 66.6 65.4 64.2 63.0 61.9 60.8 59.7 67 70.4 69.1 67.9 66.7 65.5 64.3 63.2 62.0 60.9 59.8 68 70.5 69.2 68.0 66.8 65.6 64.4 63.3 62.1 61.0 59.9 69 70.6 69.3 68.1 66.9 65.7 64.5 63.4 62.3 61.1 60.0 70 70.7 69.4 68.2 67.0 65.8 64.7 63.5 62.4 61.3 60.2 71 70.8 69.5 68.3 67.1 65.9 64.8 63.6 62.5 61.4 60.3 72 70.9 69.6 68.4 67.2 66.0 64.9 63.7 62.6 61.5 60.4 73 71.0 69.7 68.5 67.3 66.2 65.0 63.9 62.7 61.6 60.5 74 71.1 69.8 68.6 67.4 66.3 65.1 64.0 62.8 61.7 60.7 75 71.1 69.9 68.7 67.5 66.4 65.2 64.1 63.0 61.9 60.8 76 71.2 70.0 68.8 67.6 66.5 65.3 64.2 63.1 62.0 60.9 77 71.3 70.1 68.9 67.8 66.6 65.5 64.3 63.2 62.1 61.0 78 71.4 70.2 69.0 67.9 66.7 65.6 64.4 63.3 62.2 61.1 79 71.5 70.3 69.1 68.0 66.8 65.7 64.5 63.4 62.3 61.3 80 71.6 70.4 69.2 68.1 66.9 65.8 64.7 63.6 62.5 61.4 81 71.7 70.5 69.3 68.2 67.0 65.9 64.8 63.7 62.6 61.5 82 71.8 70.6 69.4 68.3 67.1 66.0 64.9 63.8 62.7 61.6 83 71.9 70.7 69.5 68.4 67.2 66.1 65.0 63.9 62.8 61.8 84 72.0 70.8 69.6 6S.5 67.3 66.2 65.1 64.0 62.9 61.9 85 72.1 70.9 69.7 68.6 67.4 66.3 65.2 64.1 63.0 62.0 86 72.2 71.0 69.8 68.7 67.5 66.4 65.3 64.2 63.2 62.1 87 72.3 71.1 69.9 68.8 67.7 66.5 65.4 64.4 63.3 62.2 88 72.4 71.2 70.0 68.9 67.8 66.6 65.5 64.5 63.4 62.3 89 72.5 71.3 70.1 69.0 67.9 66.8 65.7 64.6 63.5 62.5 90 72.6 71.4 70.2 69.1 68.0 66.9 65.8 64.7 63.6 62.6 91 72.7 71.4 70.3 69.2 68.1 67.0 65.9 64.8 63.7 62.7 92 72.8 71.5 70.4 69.3 68.2 67.1 66.0 64.9 63.9 62.8 93 72.9 71.6 70.5 69.4 68.3 67.2 66.1 65.0 64.0 62.9 94 72.9 71.7 70.6 69.5 68.4 67.3 66.2 65.1 64.1 63.0 95 73.0 71.8 70.7 69.6 68.5 67.4 66.3 65.2 64.2 63.2 96 73.1 71.9 70.8 69.7 68.6 67.5 66.4 65.4 64.3 63.3 97 73.2 72.0 70.9 69.8 68.7 67.6 66.5 65.5 64.4 63.4 98 73.3 72.1 71.0 69.9 68.8 67.7 66.6 65.6 64.5 63.5 99 73.4 72.3 71.1 70.0 68.9 67.8 66.7 65.7 64.6 63.6 100 73.5 72.4 71.2 70.1 69.0 67.9 66.8 65.8 64.8 63.7 101 73.6 72.5 71.3 70.2 69.1 68.0 67.0 65.9 64.9 63.9 102 73.7 72.6 71.4 70.3 69.2 68.1 67.1 66.0 65.0 64.0 103 73.8 72.7 71.5 70.4 69.3 68.2 67.2 66.1 65.1 64.1 104 73.9 72.8 71.6 70.5 69.4 68.3 67.3 66.2 65.2 64.2 1O.O 10.5 11.0 11.5 12.0 12.5 13.0 13.5 11.0 14.5 83 10 RELATIVE HUMIDITY FROM THE TEMPERATURE OF THE DEW-POINT. Temper- t — t' = Difference of Temperatures of the Air and of the Dew-Point. —Fahrenheit. ature f.p A ?«• Ot Air, Fahren- heit. 15.0 15.5 16.0 16.5 17.0 17.5 18.O 18.5 19.0 19.5 20° 50.6 49.5 48.4 47.3 46.2 45.1 44.1 43.1 42.1 41.2 21 50.6 49.5 48.4 47.3 46.2 45.1 44.2 43.2 42.2 41.2 22 50.7 49.5 48.4 47.4 46.3 45.2 44.2 43.2 42.2 41.3 23 50.7 49.6 48.5 47.4 46.3 45.2 44.2 43.3 42.3 41.3 24 50.7 49.6 48.5 47.4 46.4 45.3 44.3 43.3 42.3 41.4 25 50.8 49.7 48.5 47.5 46.4 45.4 44.3 43.3 42.4 41.4 26 50.9 49.S 48.6 47.6 46.5 45.4 44.4 43.4 42.4 41.5 27 51.0 49.9 48.7 47.7 46.6 45.5 44.5 43.5 42.5 41.6 28 51.1 50.0 48.8 47.7 46.7 45.6 44.6 43.6 42.6 41.6 29 51.2 50.1 48.9 47.8 46.8 45.7 44.7 43.7 42.7 41.7 30 51.4 50.2 49.0 47.9 46.8 45.8 44.7 43.7 42.7 41.8 31 51.7 50.5 49.4 48.2 47.1 46.1 45.0 44.0 43.0 42.0 32 52.0 50.8 49.7 48.5 47.4 46.4 45.3 44.3 43.3 42.3 33 52.3 51.1 50.0 48.8 47.7 46.6 45.6 44.5 43.5 42.5 34 52.6 51.4 50.3 49.1 48.0 46.9 45*9 44.8 43.8 42.8 35 52.9 51.7 50.6 49.4 48.3 47.2 46.1 45.1 44.1 43.0 36 53.2 52.0 50.9 49.7 48.6 47.5 46.4 45.4 44.4 43.3 37 53.5 52.3 51.2 50.0 48.9 47.8 46.7 45.7 44.7 43.6 38 53.8 52.6 51.5 50.3 49.2 48.1 47.0 46.0 45.0 43.9 39 54.1 52.9 51.8 50.6 49.5 48.4 47.3 46.3 45.3 44.2 40 54.4 53.2 52.1 50.9 49.8 48.7 47.6 46.6 45.6 44.5 41 54.7 53.5 52.3 51.2 50.1 49.0 47.9 46.9 45.8 44.8 42 54.9 53.8 52.6 51.5 50.4 49.3 48.2 47.2 46.1 45.1 43 55.2 54.0 52.9 51.8 50.7 49.6 48.5 47.5 46.4 45.4 44 55.5 54.3 53.2 52.1 50.9 49.9 48.8 47.7 46.7 45.7 45 55.7 54.6 53.4 52.3 51.2 50.2 49.1 48.0 47.0 46.0 46 55.9 54.7 53.6 52.5 51.4 50.4 49.3 48.3 47.2 46.2 47 56.0 54.9 53.8 52.7 51.6 50.6 49.5 48.5 47.5 46.5 48 56.2 55.0 54.0 52.9 51.8 50.8 49.8 48.7 47.7 46.7 49 56.3 55.2 54.1 53.1 52.0 51.0 50.0 49.0 47.9 47.0 50 56.5 55.4 54.3 53.2 52.2 51.2 50.2 49.2 48.2 47.2 51 56.6 55.5 54.4 53.4 52.3 51.3 50.3 49.3 48.3 47.4 52 56.7 55.6 54.6 53.5 52.5 51.5 50.5 49.5 48.5 47.5 53 56.9 55.8 54.7 53.6 52.6 51.6 50.6 49.6 48.6 47.7 54 57.0 55.9 54.8 53.8 52.7 51.7 50.7 49.8 48.8 47,8 55 57.1 56.0 55.0 53.9 52.9 51.9 50.9 49.9 48.9 48.0 56 57.3 56.2 55.1 54.1 53.0 52.0 51.0 50.0 49.1 48.1 57 57.4 56.3 55.2 54.2 53.2 52.2 51.2 50.2 49.2 48.3 58 57.5 56.4 55.4 54.3 53.3 52.3 51.3 50.3 49.4 48.4 59 57.7 56.6 55.5 54.5 53.4 52.4 51.4 50.5 49.5 48.6 60 57.8 56.7 55.6 54.6 53.6 52.6 51.6 50.6 49.7 48.7 61 57.9 56.8 55.8 54.7 53.7 52.7 51.7 50.8 49.8 48.9 62 58.0 57.0 55.9 54.9 53.8 52.8 51.9 50.9 49.9 49.0 15.0 15.5 16.0 16.5 17.0 17.5 18.0 18.5 19.O 19.5 B 84 RELATIVE HUMIDITY FROM THE TEMPERATURE OF THE DEW-POINT. 11 Temper- ature of Air, Fahren- heit. t — t' = Difference of Temperatures of the Air and of the Dew-Point. — Fahrenheit. 15.0 15.5 16.O 16.5 1*7.0 17.5 18.0 18.5 19.0 19.5 62° 58.0 57.0 55.9 54.9 53.8 52.8 51.9 50.9 49.9 49.0 63 58.2 57.1 56.0 55.0 54.0 53.0 52.0 51.0 50.1 49.1 64 58.3 57.2 56.2 55.1 54.1 53.1 52.1 51.2 50.2 49.3 65 58.4 57.4 56.3 55.3 54.3 53.3 52.3 51.3 50.4 49.4 66 58.6 57.5 56.4 55.4 54.4 53.4 52.4 51.5 50.5 49.6 67 58.7 57.6 56.6 55.5 54.5 53.5 52.6 51.6 50.6 49.7 68 58.8 57.8 56.7 55.7 54.7 53.7 52.7 51.7 50.8 49.9 69 59.0 57.9 56.8 55.8 54.8 53.8 52.8 51.9 50.9 50.0 70 59.1 58.0 57.0 55.9 54.9 53.9 53.0 52.0 61.1 50.1 71 59.2 58.2 57.1 56.1 55.1 54.1 53.1 52.1 51.2 50.3 72 59.3 58.3 57.2 56.2 55.2 54.2 53.2 52.3 51.3 50.4 73 59.5 58.4 57.4 56.3 55.3 54.3 53.4 52.4 51.5 50.6 74 59.6 58.5 57.5 56.5 55.5 54.5 53.5 52.6 51.6 50.7 75 59.7 58.7 57.6 56.6 55.6 54.6 53.6 52.7 51.7 50.8 76 59.8 58.8 57.8 56.7 55.7 54.7 53.8 52.8 51.9 51.0 77 60.0 58.9 57.9 56.9 55.9 54.9 53.9 53.0 52.0 51.1 78 60.1 59.1 58.0 57.0 56.0 55.0 54.0 53.1 52.2 51.2 79 60.2 59.2 58.1 57.1 56.1 55.1 54.2 53.2 52.3 51.4 80 60.3 59.3 58.3 57.3 56.3 55.3 54.3 53.4 52.4 51.5 81 , 60.5 59.4 58.4 57.4 56.4 55.4 54.5 53.5 52.6 51.7 82 60.6 59.6 58.5 57.5 56.5 55.5 54.6 53.6 52.7 51.8 83 60.7 59.7 58.6 57.6 56.6 55.7 54.7 53.8 52.8 51.9 84 60.8 59.8 58.8 57.8 56.8 55.8 54.8 53.9 53.0 52.1 85 60.9 59.9 58.9 57.9 56.9 55.9 55.0 54.0 53.1 52.2 86 61.1 60.0 59.0 58.0 57.0 56.1 55.1 54.2 53.2 52.3 87 61.2 60.2 59.1 58.1 57.2 56.2 55.2 54.3 53.4 52.5 88 61.3 60.3 59.3 58.3 57.3 56.3 55.4 54.4 53.5 52.6 89 61.4 60.4 59.4 58.4 57.4 56.5 55.5 54.6 53.7 52.7 90 61.6 60.5 59.5 58.5 57.6 56.6 55.6 54.7 53.8 52.9 91 61.7 60.7 59.6 58.7 57.7 56.7 55.8 54.8 53.9 53.0 92 61.8 60.8 59.8 58.8 57.8 56.9 55.9 55.0 54.1 53.2 93 61.9 60.9 59.9 58.9 57.9 57.0 56.0 55.1 54.2 53.3 94 62.0 61.0 60.0 59.0 58.1 57.1 56.2 55.2 54.3 53.4 95 62.1 61.1 60.1 59.2 58.2 57.2 56.3 55.4 54.5 53.6 96 62.3 61.3 60.3 59.3 58.3 57.4 56.4 55.5 54.6 53.7 97 62.4 61.4 60.4 59.4 58.4 57.5 56.5 55.6 54.7 53.8 98 62.5 61.5 60.5 59.5 58.6 57.6 56.7 55.8 54.9 54.0 99 62.6 61.6 60.6 59.6 58.7 57.7 56.8 55.9 55.0 54.1 100 62.7 61.7 60.7 59.8 58.8 57.9 56.9 56.0 55.1 54.2 101 62.8 61.9 60.9 59.9 58.9 58.0 57.1 56.2 55.3 54.4 102 63.0 62.0 61.0 60.0 59.1 58.1 57.2 56.3 55.4 54.5 103 63.1 62.1 61.1 60.1 59.2 58.3 57.3 56.4 55.5 54.6 104 63.2 62.2 61.2 60.3 59.3 58.4 57.5 56.6 55.7 54.8 15.0 15.5 16.0 16.5 17.0 17.5 18.O 18.5 19.O 19.5 B 85 12 RELATIVE HUMIDITY FROM THE TEMPERATURE OF THE DEW-POINT. Temper- t — t' = Difference of Temperatures of the Air and of the Dew-Point. — Fahrenheit. ature f\f Aii* OI AIT) Fahren- heit. 20.0 20.5 21.O 21.5 22.0 22.5 23.0 23.5 24.0 24.5 20° 40.2 39.3 38.4 37.5 36.6 35.8 34.9 34.1 33.3 32.5 21 40.3 39.4 38.4 37.6 36.7 35.8 35.0 34.2 33.4 32.6 22 40.3 39.4 38.5 37.6 36.8 35.9 35.1 34.3 33.5 32.7 23 40.4 39.5 38.6 37.7 36.8 36.0 35.2 34.4 33.6 32.8 24 40.4 39.6 38.6 37.8 36.9 36.1 35.2 34.4 33.6 32.9 25 40.5 39.6 38.7 37.9 37.0 36.2 35.3 34.5 33.7 33.0 26 40.5 39.7 38.8 37.9 37.0 36.2 35.4 34.6 33.8 33.1 27 40.6 39.7 38.8 38.0 37.1 36.3 35.5 34.7 33.9 33.1 28 40.7 39.8 38.9 38.0 37.2 36.3 35.5 34.7 34.0 33.2 29 40.8 39.9 38.9 38.1 37.2 36.4 35.6 34.8 34.0 33.3 30 40.8 39.9 39.0 38.1 37.3 36.5 35.7 34.9 34.1 33.4 31 41.1 40.2 39.2 38.4 37.5 36.7 35.9 35.1 34.3 33.6 32 41.3 40.4 39.5 38.6 37.7 37.0 36.1 35.3 34.5 33.8 33 41.6 40.6 39.7 38.8 38.0 37.2 36.3 35.5 34.7 34.0 34 41.8 40.9 39.9 39.1 38.2 37.4 36.5 35.7 34.9 34.2 35 42.1 41.1 40.2 39.3 38.4 37.7 36.7 35.9 35.1 34.4 36 42.3 41.4 40.4 39.6 38.7 37.9 37.0 36.2 35.4 34.6 37 42.6 41.7 40.7 39.8 38.9 38.2 37.2 36.4 35.6 34.8 38 42.8 42.0 41.0 40.1 39.2 38.4 37.5 36.6 35.8 35.0 39 43.1 42.3 41.3 40.4 39.5 38.6 37.7 36.9 36.0 35.2 40 43.3 42.6 41.6 40.7 39.8 38.9 38.0 37.1 36.3 35.4 41 43.7 42.9 41.9 41.0 40.0 39.1 38.3 37.4 36.5 35.7 42 44.0 43.2 42.2 41.2 40.3 39.4 38.5 37.7 36.8 36.0 43 44.3 43.4 42.5 41.5 40.6 39.7 38.8 38.0 37.1 36.3 44 44.7 43.7 42.8 41.8 40.9 40.0 39.1 38.2 37.4 36.6 45 46.0 44.0 43.1 42.1 41.2 40.3 39.4 38.5 37.7 36.8 46 45.2 44.3 43.3 42.4 41.4 40.5 39.7 38.8 37.9 37.1 47 45.5 44.5 43.6 42.6 41.7 40.8 39.9 39.1 38.2 37.4 48 45.7 44.3 43.8 42.9 42.0 41.1 40.2 39.3 38.5 37.6 49 46.0 45.0 44.1 43.2 42.2 41.3 40.5 39.6 38.7 37.9 50 46.2 45.3 44.3 43.4 42.5 41.6 40.7 39.9 39.0 37.2 51 46.4 45.4 44.5 43.6 42.7 41.8 40.9 40.1 39.2 38.4 52 46.6 45.5 44.7 43.8 42.9 42.0 41.2 40.3 39.5 38.6 53 46.7 45.8 44.9 44.0 43.1 42.2 41.4 40.5 39.7 38.9 54 46.9 46.0 45.1 44.2 43.3 42.4 41.6 40.8 39.9 39.1 55 47.0 46.1 45.2 44.4 43.5 42.6 41.8 41.0 40.1 39.3 56 47.2 46.3 45.4 44.5 43.6 42.8 42.0 41.1 40.3 39.5 57 47.3 46.4 45.5 44.7 43.8 42.9 42.1 41.3 40.5 39.6 58 47.5 46.6 45.7 44.8 43.9 43.1 42.3 41.4 40.6 39.8 59 47.6 46.7 45.8 45.0 44.1 43.2 42.4 41.6 40.8 40.0 60 47.8 46.9 46.0 45.1 44.2 43.4 42.5 41.7 40.9 40.1 61 47.9 47.0 46.1 45.3 44.4 43.5 42.7 41.9 41.1 40.3 62 48.1 47.2 46.3 45.4 44.5 43.7 42.8 42.0 41.2 40.4 20.0 20.5 21.O 21.5 22.0 22.5 23.0 23.5 24.O 24.5 86 RELATIVE HUMIDITY FROM THE TEMPERATURE OF THE DEW-POINT. 13 Temper- ature of Air, Fahren- heit. t — t' = Difference of Temperatures of the Air and of the Dew-Point. — Fahrenheit. 2O.O 2O.5 21.O 21.5 22.O 22.5 23.O 23.5 24.0 24.5 62° 48.1 47.2 46.3 45.4 44.5 43.7 42.8 42.0 41.2 40.4 63 48.2 47.3 46.4 45.5 44.7 43.8 43.0 42.2 41.4 40.6 64 48.4 47.5 46.6 45.7 44.8 44.0 43.1 42.3 41.5 40.7 65 48.6 47.6 46.7 45.8 45.0 44.1 43.3 42.5 41.7 40.9 66 48.7 47.8 46.9 46.0 45.1 44.3 43.4 42.6 41.8 41.0 67 48.8 47.9 47.0 46.1 45.3 44.4 43.6 42.8 42.0 41.2 63 48.9 48.0 47.2 46.3 45.4 44.6 43.7 42.9 42.1 41.3 69 49.1 48.2 47.3 46.4 45.6 44.7 43.9 43.1 42.3 41.5 70 49.2 48.3 47.4 46.6 45.7 44.9 44.0 43.2 42.4 41.6 71 49.4 48.5 47.6 46.7 45.9 45.0 44.2 43.4 42.6 41.8 72 49.5 48.6 47.7 46.9 46.0 45.2 44.3 43.5 42.7 41.9 73 49.6 48.8 47.9 47.0 46.1 45.3 44.5 43.7 42.9 42.1 74 49.8 48.9 48.0 47.1 46.3 45.4 44.6 43.8 43.0 42.2 75 49.9 49.0 48.2 47.3 46.4 45.6 44.8 44.0 43.1 42.4 76 50.1 49.2 48.3 47.4 46.6 45.7 44.9 44.1 43.3 42.5 77 50.2 49.3 48.5 47.6 46.7 45.9 45.1 44.2 43.4 42.6 78 50.3 49.5 48.6 47.7 46.9 46.0 45.2 44.4 43.6 42.8 79 50.5 49.6 48.7 47.8 47.0 46.2 45.3 44.5 43.7 43.0 80 50.6 49.7 48.9 48.0 47.2 46.3 45.5 44.7 43.9 43.1 81 50.8 49.9 49.0 48.1 47.3 46.5 45.6 44.8 44.0 43.2 82 50.9 50.0 49.2 48.3 47.4 46.6 45.8 45.0 44.2 43.4 83 51.0 50.1 49.3 48.4 47.6 46.8 45.9 45.1 44.3 43.5 84 51.2 50.3 49.4 48.6 47.7 46.9 46.1 45.3 44.5 43.7 85 51.3 50.4 49.6 48.7 47.9 47.0 46.2 45.4 44.6 43.8 86 51.4 50.6 49.7 48.8 48.0 47.2 46.4 45.6 44.8 44.0 87 51.6 50.7 49.8 49.0 48.1 47.3 46.5 45.7 44.9 44.1 88 51.7 50.8 50.0 49.1 48.3 47.5 46.6 45.8 45.0 44.3 89 51.9 51.0 50.1 49.3 48.4 47.6 46.8 46.0 45.2 44.4 90 52.0 51.1 50.3 49.4 48.6 47.7 46.9 46.1 45.3 44.6 91 52.1 51.3 50.4 49.5 48.7 47.9 47.1 46.3 45.5 44.7 92 52.3 51.4 50.5 49.7 48.8 48.0 47.2 46.4 45.6 44.8 93 52.4 51.5 50.7 49.8 49.0 48.2 47.4 46.6 45.8 45.0 94 52.5 51.7 50.8 50.0 49.1 48.3 47.5 46.7 45.9 45.1 95 52.7 51.8 50.9 50.1 49.3 48.4 47.6 46.8 46.1 45.3 96 52.8 51.9 51.1 50.2 49.4 48.6 47.8 47.0 46.2 45.4 97 52.9 52.1 51.2 50.4 49.5 48.7 47.9 47.1 46.3 45.6 98 53.1 52.2 51.4 50.5 49.7 48.9 48.1 47.3 46.5 45.7 99 53.2 52.3 51.5 50.6 49.8 49.0 48.2 47.4 46.6 45.9 100 53.4 52.5 51.6 50.8 50.0 49.1 48.3 47.5 46.8 46.0 101 53.5 52.6 51.8 50.9 50.1 49.3 48.5 47.7 46.9 46.2 102 53.6 52.8 51.9 51.1 50.2 49.4 48.6 47.8 47.1 46.3 103 104 53.8 53.9 52.9 ^3.0 52.0 52.2 51.2 51.3 50.4 50.5 49.6 49.7 48.8 48.9 48.0 48.1 47.2 47.3 46.4 46.6 20.0 20.5 21.0 21.5 22.0 22.5 23.O 23.5 24.O 24.5 B 87 TABLE IX. FACTOR ^°, FOR COMPUTING THE RELATIVE HUMIDITY, OR THE DEGREE OF MOISTURE OF THE AIR, EXPRESSED IN HUNDREDTHS, FROM ITS ABSOLUTE HUMIDITY GIVEN IN ENGLISH MEASURES. THE Relative Humidity, or the degree of moisture of the air, is, as explained above, the ratio of the quantity of vapor contained in the air to the quantity it could contain at the temperature observed, if fully saturated. If we call The force of vapor contained in the air = f, The maximum of the force of vapor at the temperature of the air = F, The point of saturation = 100, we have the proportion, Relative Humidity : 100 : :/: F, and /x^ioo _ Reiative Humidity in Hundredths. But as ^—g,— =f X ^°, it is obvious that the operation indicated by the former expression, viz. /XF100, would be reduced to a simple multiplication, if we had a table of the factors F . Such a table is obtained by dividing the constant number 100 by each number in the Table of Elastic Forces of Vapor, and substituting the quotients for the tensions, or forces of vapor. The following Table gives the factor j? for every tenth of a degree from 0° to 104° Fahrenheit, corresponding to the Forces of Vapor in Table VI., or Regnault's table reduced to English measures. \ USE OF THE TABLE. The force of vapor contained in the air, or its absolute humidity, being given in English measures, multiply the number expressing it by the factor in the table cor- responding to the temperature of the air at the time of the observation ; the result will be the Relative Humidity in Hundredths. Examples. 1. Suppose the temperature of the air to be = 60° Fahrenheit. " force of vapor in the air to be = .388 English inch. Opposite 60° is found in the table the factor 193.1. Then 0.388 x 193.1 = 74.9, Relative Humidity in Hundredths. 2. Suppose the temperature of the air to be = 74°. 5 Fahrenheit. " force of vapor in the air to be = .650 English inch. Table gives for 74°.5 the factor 117.2. Then 0.650 x 117.2 = 76.2, Relative Humidity required. B 88 IX. FACTOR ™, FOR COMPUTING THE RELATIVE HUMIDITY, OR THE DEGREE OF MOISTURE OF THE AIR, EXPRESSED IN HTJNDREDTHS, FROM ITS ABSOLUTE HUMIDITY GIVEN IN ENGLISH INCHES. Temper- ature of Air, Fahren- heit. Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0° 2306 2295 2285 2275 2264 2254 2243 2233 2222 2211 1 2201 2191 2181 2171 2162 2152 2142 2132 2122 2111 2 2101 2092 2083 2074 2064 2055 2045 2036 2026 2017 3 2007 1998 1990 1981 1972 1963 1954 1945 1936 1927 4 1918 1910 1901 1893 1885 1876 1868 1859 1851 1842 5 1834 1826 1818 1810 1802 1794 1786 1777 1769 1761 6 1753 1745 1738 1730 1722 1714 1707 1699 1691 1683 7 1675 1668 1660 1653 1646 1638 1631 1623 1616 1608 8 1600 1594 1587 1580 1572 1565 1558 1551 1544 1537 9 1529 1523 1516 1509 1503 1496 1489 1482 1475 1469 10 1462 1455 1449 1443 1436 1430 1423 1417 1410 1404 11 1397 1391 1385 1379 1373 1367 1361 1355 1348 1342 12 1336 1330 1324 1319 1313 1307 1301 1295 1289 1284 13 1278 1272 1267 1261 1255 1250 1244 1239 1233 1228 14 1222 1217 1211 1206 1200 1195 1189 1184 1178 1173 15 1167 1162 1157 1151 1146 1141 1136 1130 1125 1120 16 1114 1109 1104 1099 1094 1089 1084 1079 1074 1069 17 1064 1059 1055 1050 1045 1040 1035 1031 1026 1021 18 1016 1012 1007 1003 998.2 993.6 989.1 984.5 979.9 975.3 19 970.6 966.4 962.2 957.9 953.7 949.4 945.0 940.7 936.3 931.9- 20 927.5 923.5 919.5 915.5 911.4 907.4 903.3 899.1 895.0 890.8 21 886.7 882.9 879.1 875.3 871.4 867.6 863.7 859.8 855.8 851.9 22 847.9 844.3 840.7 837.1 833.4 829.8 826.1 822.4 818.7 815.0 23 811.2 807.8 804.3 800.8 797.3 793.8 790.2 786.7 783.1 779.5 24 775.9 772.6 769.3 766.0 762.7 759.3 756.0 752.6 749.2 745.8 23 742.4 739.3 736.2 733.0 729.9 726.7 723.5 720.3 717.1 713.9 26 710.6 707.7 704.7 701.8 698.8 695.8 692.8 689.7 686.7 683.6 27 680.5 677.8 675.0 672.1 669.3 666.5 663.6 660.7 657.8 654.9 28 652.0 649.4 646.7 644.1 641.4 638.7 636.0 633.3 630.5 627.8 29 625.0 622.5 620.0 617.5 614.9 612.4 609.8 607.2 604.6 602.0 30 599.4 597.1 594.7 592.3 589.9 587.4 585.0 582.6 580.1 577.6 31 575.1 572.9 570.7 568.4 566.2 563.9 561.6 559.2 556.9 554.5 0. 1. 2. 3. 4. 5. 6. •7. 8. 9. B 89 FACTOR 100 FOR COMPUTING THE RELATIVE HUMIDITY. Temper- Tenths ( )f Degrees. ature of Air, Fahren- heit. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 32° 552.2 550.0 547.8 545.7 543.6 541.4 539.3 537.2 535.1 533.0 33 530.9 528.8 526.8 524.7 522.7 520.6 518.6 516.5 514.5 512.5 34 510.5 508.5 506.5 504.5 502.5 500.5 498.6 496.6 494.7 492.7 35 490.8 488.9 487.0 485.1 483.2 481.3 479.4 477.5 475.6 473.8 36 471.9 470.1 468.2 466.4 464.6 462.8 461.0 459.2 457.4 455.6 37 453.8 452.0 450.3 448.5 446.8 445.0 443.3 441.6 439.9 438.1 38 436.4 434.7 433.1 431.4 429.7 428.0 426.4 424.7 423.1 421.4 39 419.8 418.2 416.6 415.0 413.4 411.8 410.2 408.6 407.0 405.5 40 403.9 402.4 400.8 399.3 397.8 396.2 394.7 393.2 391.7 290.2 41 388.7 387.2 885.8 384.3 382.9 381.4 380.0 378.5 377.1 375.7 42 374.3 372.9 371.5 370.0 368.6 367.3 365.9 364.5 363.1 361.7 43 360.4 359.0 357.6 356.3 354.9 353.6 352.3 350.9 349.6 348.3 44 347.0 345.6 344.3 343.0 341.7 340.4 339.2 337.9 336.6 335.3 45 334.1 332.8 331.6 330.3 328.1 327.8 326.6 325.4 324.1 322.9 46 321.7 320.5 319.3 318.1 316.9 315.7 314.5 313.3 312.2 311.0 47 309.8 308.7 307.5 306.4 305.2 304.1 302.9 301.8 300.7 299.6 43 298.5 297.3 296.2 295.1 294.0 292.9 291.9 290.8 289.7 288.6 49 287.6 286.5 285.4 284.4 283.3 282.3 281.3 280.2 279.2 278.2 ' 50 277.1 276.1 275.1 274.1 273.1 272.1 271.1 270.1 269.1 268.2 51 267.2 266.2 265.2 264.3 263.3 262.3 261.4 260.4 259.5 258.5 52 257.6 256.6 255.7 254.8 253.8 252.9 252.0 251. 250.2 249.3 53 248.3 247.4 246.5 1 245.6 244.7 243.9 243.0 242. 241.2 240.3 54 239.5 238.6 237.7 236.9 236.0 235.1 234.3 233. 232.6 231.7 55 230.9 230.1 229.2 228.4 227.6 226.8 225.9 225. 224.3 223.5 56 222.7 221.9 221.1 220.3 219.5 218.7 217.9 217. 216.4 215.6 57 214.8 214.0 213.3 212.5 211.8 211.0 210.2 209.5 208.7 208.0 58 207.3 206.5 205.8 205.0 204.3 203.6 202.9 202.2 201.4 200.7 59 200.0 199.3 198.6 197.9 197.2 196.5 195.8 195.1 194.4 193.8 €0 193.1 192.4 191.7 191.0 190.4 189.7 189.0 188.4 187.7 187.0 61 186.4 185.7 185.1 184.4 183.8 183.1 182.5 181.8 181.2 180.6 62 179.9 179.3 178.7 178.0 177.4 176.8 176.2 175.6 174.9 174.3 63 173.7 173.1 172.5 171.9 171.3 170.7 170.1 169.5 168.9 168.3 64 167.7 167.1 166.6 166.0 165.4 164.8 164.3 163.7 163.1 162.5 65 162.0 161.4 160.9 160.3 159.7 159.2 158.6 158.1 157.5 157.0 66 156.5 155.9 155.4 154.8 154.3 153.8 153.2 152.7 152.2 151.7 67 151.1 150.6 150.1 149.6 149.1 148.6 148.1 147.6 147.1 146.6 0. 1. 2. 3. 4. 5. 6. •7. 8. 9. B 90 FACTOR 100 T? FOR COMPUTING THE RELATIVE HUMIDITY. Temper- ature of Air, Fahren- heit. Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 68° 146.0 145.6 145.1 144.6 144.1 143.6 143.1 142.6 142.1 141.6 69 141.2 140.7 140.2 139.7 139.2 138.8 138.3 137.8 137.4 186.9 70 136.4 136.0 135.5 135.1 134.6 134.1 133.7 133.2 132.8 132.3 71 131.9 131.4 131.0 130.5 130.1 129.7 129.2 128.8 128.3 127.9 72 127.5 127.1 126.6 126.2 125.8 125.3 124.9 124.5 124.1 123.7 73 123.3 122.8 122.4 122.0 121.6 121.2 120.8 120.4 120.0 119.6 74 119.2 118.8 118.4 118.0 117.6 117.2 116.8 116.4 116.0 115.6 75 115.3 114.9 114.5 114.1 113.7 113.3 113.0 112.6 112.2 111.9 76 111.5 111.1 110.7 110.4 110.0 109.6 109.3 108.9 108.6 108.2 77 107.9 107.5 107.1 106.8 106.4 106.1 105.7 105.4 105.1 104.7 78 104.4 104.0 103.7 103.3 103.0 102.7 102.3 102.0 101.7 101.3 79 101.0 100.7 100.3 100.0 99.68 99.35 99.02 98.70 98.38 98.06 80 97.73 97.42 97.10 96.78 96.47 96.15 95.84 95.52 95.21 94.90 81 94.59 94.29 93.98 93.67 93.37 93.06 92.76 92.46 92.16 91.86 82 91.56 91.26 90.97 90.67 90.38 90.09 89.80 89.51 89.22 88.93 83 88.64 88.36 88.07 87.79 87.50 87.22 86.94 86.66 86.38 86.10 84 85.83 85.55 85.27 85.00 84.73 84.46 84.19 83.92 83.65 83.38 85 83.12 82.85 82.59 82.32 82.06 81.80 81.54 81.28 81.02 80.77 86 80.51 80.25 80.00 79.74 79.49 79.24 78.99 78.74 78.49 78.24 87 77.99 77.75 77.50 77.26 77.01 76.77 76.52 76.28 76.04 75.80 88 ' 75.56 75.32 75.08 74.85 74.61 74.37 74.14 73.91 73.67 73.44 89 73.21 72.98 72.75 72.52 72.29 72.06 71.84 71.61 71.39 71.16 90 70.94 70.72 70.49 70.27 70.05 69.83 69.61 69.39 69.18 68.96 91 68.74 68.53 68.32 68.10 67.89 67.68 67.47 67.26 67.05 66.84 92 66.63 66.42 66.22 66.01 65.81 65.60 65.40 65.19 64.99 64.79 93 64.59 64.39 64.19 63.99 63.79 63.59 63.40 63.20 63.01 62.81 94 62.62 62.43 62.24 62.04 61.85 61-66 61.47 61.29 61.10 60.91 95 60.72 60.54 60.35 60.17 59.98 59.80 59.62 59.43 59.25 59.07 96 58.89 58.71 58.53 58.35 58.17 58.00 57.82 57.64 57.47 57.29 97 57.12 56.94 56.77 56.60 56.42 56.25 56.08 55.91 55.74 55.57 98 55.40 55.23 55.06 54.90 54.73 54.56 54.40 54.23 54.07 53.91 ' 99 53.74 53.58 53.42 53.26 53.09 52.93 52.77 52.61 52.45 52.30 100 52.14 51.98 51.82 51.67 51.51 51.36 51.20 51.05 50.90 50.74 101 50.59 50.44 50.29 ^50.14 49.99 49.84 49.69 49.54 49.39 49.24 102 49.10 48.95 48.80 '48.66 48.51 48.37 48.22 48.08 47.94 47.79 103 47.65 47.51 47.37 47.23 47.09 46.95 46.81 46.67 46.53 46.40 104 46.26 46.12 45.99 45.85 45.72 45.58 45.45 45.31 45.18 45.04. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. B 91 TABLE X. WEIGHT OF VAPOR, IN GRAINS TROT, * CONTAINED IN A CUBIC FOOT OF SATURATED AIR, UNDER A BAROMETRIC PRESSURE OF 30 ENGLISH INCHES, AT TEMPERATURES BETWEEN 0° AND 105° FAHRENHEIT. THE weight of a litre of dry air at the temperature of zero Centigrade, or 32° Fahrenheit, and under a barometric pressure of 760 millimetres, as determined by the experiments of Regnault (Memoires de Vlnstitut, Tom. XXI. p. 157), and corrected for a slight error of computation (see above, p. 38), is 1.293223 grammes. The co- efficient of expansion of the air, according to the same physicist, is 0.00367 for 1° Centigrade ; and the theoretic density of vapor is nearly 0.622, or £, of that of the air at the same temperature and pressure. From these elements the weight of the vapor contained in a determined volume of air, the temperature and humidity of which are known, can be deduced. Reducing these values to English measures, 1 litre being = 61.02705 cubic inches, and 1 gramme = 15.43208 grains Troy, we have 1.293223 grammes = 19.9571208 grains, and 61.027051 cubic inches : 19.9571208 grains : : 1 cubic inch : 0.32702 grain. Therefore, the weight of a cubic foot of dry air, at 32° Fahrenheit, under a pressure of 760 millimetres, or 29.922 English inches, is = 0.32702 grain X 1728 = 565.0923 grains Troy. Under a barometric pressure of 30 inches, it becomes OA X 565.0923 = 566.5654 grains. 29.922 The coefficient for the expansion of the air becomes 0.0020361 of its bulk for 1° Fahrenheit. Now, if we call t = the temperature of the air ; W = the weight of vapor in a saturated air at the temperature t ; F = the maximum of the force of vapor due to the temperature £, as given in the tables ; then the weight of the vapor contained in a cubic foot of saturated air is given by the formula W _ 0 622 566.5654 grains ^ £ . 1 -+- 0.002036 X (t— 32°) 30 ' from which the values in Table X. have been computed. The forces of vapor due to the temperatures in the first column are those of Regnault, as given in Table VI. It is evident, that, in order to find the weight of the vapor contained in the air at any state of humidity and pressure, it suffices to substitute for the normal values of — the force of vapor and the barometric pressure given by the observation. B 93 X. WEIGHT OF VAPOR, IN GRAINS TROY, CONTAINED IN A CUBIC FOOT OF SATURATED AIR, AT TEMPERATURES Temper- ature of Air, Fahren. Force of Vapor in Eng. Inches. Weight Vapor in Grains. Differ- ence. Temper- ature of Air, Fahren. Force of Vapor in Eng. Inches. Weight of Vapor in Grains. Differ- ence. Temper- ature of Air, Fahren. Force of Vapor in Eng. Inches. Weight of Vapor in Grains. Differ- ence. 0° 0.043 0.545 35° 0.204 2.379 70° 0.733 7.992 0.024 0.090 0.261 1 0.045 0.569 36 0.212 2.469 71 0.758 8.252 2 0.048 0.595 0.025 37 0.220 2.563 0.093 72 0.784 8.521 0.268 3 0.050 0.621 0.027 38 0.229 2.659 0.097 73 0.811 8.797 0.276 4 0.052 0.649 0.028 39 0.238 2.759 0.100 74 0.839 9.081 0.284 0.029 0.103 0.291 5 0.055 0.678 40 0.248 2.862 75 0.868 9.372 6 0.057 0.708 0.030 41 0.257 2.967 0.106 76 0.897 9.670 0.298 7 0.060 0.739 0.031 42 0.267 3.076 0.109 77 0.927 9.977 0.307 8 0.062 0.772 0.033 43 0.277 3.189 0.113 78 0.958 10.292 0.315 9 0.065 0.806 0.034 44 0.288 3.306 0.116 79 0.990 10.616 0.324 0.035 0.120 0.332 10 0.068 0.841 45 0.299 3.426 80 1.023 10.949 0.037 0.124 0.342 11 0.072 0.878 46 0.311 3.550 81 1.057 11.291 12 0.075 0.916 0.038 47 0.323 3.679 0.129 82 1.092 11.643 0.352 13 0.078 0.957 0.040 48 0.335 3.811 0.133 83 1.128 12.005 0.361 14 0.082 0.999 0.042 49 0.348 3.948 0.137 84 1.165 12.376 0.371 0.044 0.141 0.380 15 0.086 .043 50 0.361 4.089 85 1.203 12.756 16 0.090 .090 0.046 51 0.374 4.234 0.145 86 1.242 13.146 0.390 17 0.094 .138 0.049 52 0.388 4.383 0.149 87 1.282 13.546 0.400 0*051 0.154 0.411 18 0.098 .190 53 0.403 4.537 88 1.323 13.957 19 0.103 .243 0.053 54 0.418 4.696 0.159 89 1.366 14.378 0.421 0.055 0.163 0.432 20 0.108 .298 55 0.433 4.860 90 1.410 14.810 0.057 0.168 0.443 21 0.113 .355 56 0.449 5.028 91 1.455 15.254 22 0.118 .415 0.059 57 0.466 5.202 0.174 92 1.501 15.709 0.455 23 0.123 1.476 0.062 58 0.482 5.381 0.179 93 1.548 16.176 0.467 24 0.129 1.540 0.064 59 0.500 5.566 0.185 94 1.597 16.654 0.479 0.066 0.190 0.491 25 O.J35 .606 60 0.518 5.756 95 1.647 17.145 26 0.141 .674 0.068 61 0.537 5.952 0.196 96 1.698 17.648 0.503 27 0.147 .745 0.070 62 0.556 6.154 0.202 97 1.751 18.164 0.516 28 0.153 .817 0.073 63 0.576 6.361 0.208 98 1.805 18.693 0.529 29 0.160 .892 0.075 64 0.596 6.575 0.214 99 1.861 19.235 0.542 0.077 0.220 0.555 30 0.167 1.969 65 0.617 6.795 100 1.918 19.790 31 0.174 2.046 0.077 66 0.639 7.021 0.226 101 1.977 20.357 0.567 32 0.181 2.126 0.080 67 0.662 7.253 0.232 102 2.037 20.938 0.582 33 0.188 2.208 0.082 68 0.685 7.493 0.239 103 2.099 21.535 0.596 34 0.196 2.292 0.084 69 0.708 7.739 0.246 104 2.162 22.146 0.611 35 0.204 2.379 0.087 70 0.733 7.992 0.253 105 2.227 22.771 0.625 B 93 PRACTICAL TABLES, ENGLISH MEASURES, BASED ON THE HYGROMETRICAL CONSTANTS ADOPTED IN THE GREENWICH OBSERVATIONS. B 95 TABLE OF THE ELASTIC FOKCES OF AQUEOUS VAPOK, UNDER A PRESSURE OF 30 INCHES, EXPRESSED IN ENGLISH INCHES OF MERCURY FOR TEMPERATURES OF FAHRENHEIT, ADOPTED IN THE GREENWICH OBSERVATIONS. THIS table contains the values of the elastic force of vapor for temperatures from 0° to 90° Fahrenheit, derived from Dalton's experiments by Biot's formula, by Anderson, and published in Edinburgh Encyclopedia, Art. Hygrometry. It is re- published, without the last decimal, in the volumes of the Greenwich Magnetic and Meteorological Observations, and on it are based the various hygrometrical tables published by Mr. Glaisher, either in the Greenwich volumes, or separately, most of which will be found below, Tables XII. to XVII. Since Dalton published his experiments, numerous attempts have been made by various skilful physicists to determine with greater accuracy the elastic force of vapor. Dr. Ure in England, Regnault in France, and Magnus in Germany, deserve in this respect a special notice. The last two experimenters having arrived simultaneously at results nearly iden- tical, and their experiments having been conducted with all the care that modern science requires, and the means that it can secure, their determinations seem to com- mand an especial confidence, and to deserve the preference over all others. It is, therefore, much to be regretted that the usefulness of the following otherwise so valu- able tables, the formation of which involved so much labor, is in a measure impaired by the fact that they were computed from elements which cannot be regarded as the most reliable we now possess. B 97 XI. TABLE OF THE ELASTIC FORCE OF AQUEOUS VAPOR, WNHER A BAROMETRIC PRESSURE OF 30 INCHES, EXPRESSED IN ENGLISH INCHES OF MERCURY FOR TEMPERATURES OF FAHRENHEIT. FROM THE GREENWICH OBSERVATIONS. Temper- ature 1 Fahren- heit. Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. o 0 Eng. In. 0.061 Eng. In. 0.061 Eng. In. 0.062 Eng. In. 0.062 Eng. In. 0.062 Eng. In. 0.062 Eng. In. 0.063 Eng. In. 0.063 Eng. In. 0.063 Eng. In. 0.063 1 0.064 0.064 0.064 0.064 0.065 0.065 0.065 0.065 0.066 0.066 2 0.066 0.066 0.067 0.067 0.067 0.067 0.068 0.068 0.068 0.068 3 0.069 0.069 0.069 0.069 0.070 0.070 0.070 0.071 0.071 0.071 4 0.071 0.072 0.072 0.072 0.072 0.073 0.073 0.073 0.073 0.074 5 0.074 0.074 0.075 0.075 0.075 0.075 0.076 0.076 0.076 0.077 6 0.077 0.077 0.077 0.078 0.078 0.078 0.079 0.079 0.079 0.080 7 0.080 0.080 0.080 0.081 0.081 0.081 0.082 0.082 0.082 0.083 8 0.083 0.083 0.083 0.084 0.084 0.084 0.085 0.085 0.085 0.086 9 0.086 0.086 0.087 0.087 0.087 0.088 0.088 0.088 0.089 0.089 10 0.089 0.090 0.090 0.090 0.091 0.091 0.091 0.092 0.092 0.092 11 0.093 0.093 0.093 0.094 0.094 0.094 0.095 0.095 0.096 0.096 12 0.096 0.097 0.097 0.097 0.098 0.098 0.098 0.099 0.099 0.099 13 0.100 0.100 0.101 0.101 0.101 0.102 0.102 0.102 0.103 0.103 14 0.104 0.104 0.104 0.105 0.105 0.106 0.106 0.106 0.107 0.107 15 0.108 0.108 0.108 0.109 0.109 0.110 0.110 0.110 0.111 0.111 16 0.112 0.112 0.112 0.113 0.113 0.114 0.114 0.115 0.115 0.115 17 0.116 0.116 0.117 0.117 0.118 0.118 0.118 0.119 0.119 0.120 18 0.120 0.121 0.121 0.121 0.122 0.122 0.123 0.123 0.124 0.124 19 0.125 0.125 0.126 0.126 0.126 0.127 0.127 0.128 0.128 0.129 20 0.129 0.130 0.130 0.131 0.131 0.132 0.132 0.133 0.133 0.134 0. 1. 2. 3. 4. 5. 6. •7. 8. 9. 99 ELASTIC FORCE OF AQUEOUS VAPOR. From the Greenwich Observations. Teathfl of Degrees. Temper- ature Fahren- heit. 0. 1. 2. 3. 4. 5. 6. •7. 8. 9. o Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. 21 0.134 0.135 0.135 0.136 0.136 0.137 0.137 0.138 0.138 0.139 22 0.139 0.140 0.140 0.141 0.141 0.142 0.142 0.143 0.143 0.144 23 0.144 0.145 0.145 0.146 0.146 0.147 0.147 0.148 0.148 0.149 24 0.150 0.150 0.151 0.152 0.152 0.152 0.153 0.153 0.154 0.155 25 0.155 0.156 0.156 0.157 0.157 0.158 0.158 0.159 0.160 0.160 26 0.161 0.161 0.162 0.163 0.163 0.164 0.164 0.165 0.165 0.166 27 0.167 0.167 0.168 0.168 0.169 0.170 0.170 0.171 0.172 0.172 28 0.173 0.173 0.174 0.175 0.175 0.176 0.177 0.177 0.178 0.178 29 0.179 0.180 0.180 0.181 0.182 0.182 0.183 0.184 0.184 0.185 30 0.186 0.186 0.187 0.188 0.188 0.189 0.190 0.190 0.191 0.192 31 0.192 0.193 0.194 0.194 0.195 0.196 0.197 0.197 0.198 0.198 32 0.199 0.200 0.201 0.201 0.202 0.203 0.204 0.204 0.205 0.206 33 0.207 0.207 0.208 0.209 0.210 0.210 0.211 0.212 0.213 0.213 34 0.214 0.215 0.216 0.216 0.217 0.218 0.219 0.219 0.220 0.221 35 0.222 0.223 0.223 0.224 0.225 0.226 0.227 0.227 0.228 0.229 36 0.230 0.231 0.231 0.232 0.233 0.234 0.235 0.235 0.236 0.237 37 0.238 0.239 0.240 0.240 0.241 0.242 0.243 0.244 0.245 0.246 38 0.246 0.247 0.248 0.249 0.250 0.251 0.252 0.253 0.253 0.254 39 0.255 0.256 0.257 0.258 0.259 0.260 0.261 0.262 0.263 0.263 40 0.264 0.265 0.266 0.267 0.268 0.269 0.270 0.271 0.272 0.273 41 0.274 0.275 0.276 0.277 0.278 0.279 0.280 0.281 0.282 0.282 42 0.283 0.284 0.285 0.286 0.287 0.288 0.289 0.290 0.291 0.292 43 0.293 0.295 0.296 0.297 0.298 0.299 0.300 0.301 0.302 0.303 44 0.304 0.305 0.306 0.307 0-308 0.309 0.310 0.311 0.312 0.313 45 0.315 0.316 0.317 0.318 0.319 0.320 0.321 0.322 0.323 0.324 46 0.326 0.327 0.328 0.329 0.330 0.331 0.332 0.333 0.335 0.336 47 0.337 0.338 0.339 0.340 0.342 0.343 0.344 0.345 0.346 0.348 48 0.349 0.350 0.351 0.352 0.354 0.355 0.356 0.357 0.358 0.360 49 0.361 0.362 0.363 0.365 0.366 0.367 0.368 0.370 0.371 0.372 50 0.373 0.375 0.376 0.377 0.379 0.380 0.381 0.382 0.383 0.385 51 0.386 0.388 0.389 0.390 0.392 0.393 0.394 0.3D6 0.397 0.398 52 0.400 0.401 0.402 0.404 0.405 0.407 0.408 0.409 0.411 0.412 53 0.414 0.415 0.416 0.418 0.419 0.421 0.422 0.423 0.425 0.426 54 0.428 0.429 0.431 0.432 0.434 0.435 0.437 0.438 0.440 0.441 55 0.442 0.444 0.445 0.447 0.449 0.450 0.452 0.453 0.455 0.456 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. B 100 ELASTIC FORCE OF AQUEOUS VAPOR. From the Greenwich Observations. Tenths of Degrees. Temper- ature Fahren- heit. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. o Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. 56 0.458 0.459 0.461 0.462 0.464 0.465 0.467 0.469 0.470 0.472 57 0.473 0.475 0.476 0.478 0.480 0.481 0.483 0.485 0.486 0.488 58 0.489 0.491 0.493 0.494 0.496 0.498 0.499 0.501 0.503 0.504 59 0.506 0.508 0.509 0.511 0.513 0.515 0.516 0.518 0.520 0.521 60 0.523 0.525 0.527 0.528 0.530 0.532 0.534 0.536 0.537 0.539 61 0.541 0.543 0.544 0.546 0.548 0.550 0.552 0.554 0.555 0.557 62 0.559 0.561 0.563 0.565 0.567 0.568 0.570 0.572 0.574 0.576 63 0.578 0.580 0.582 0.584 0.586 0.588 0.590 0.591 0.593 0.595 64 0.597 0.599 0.601 0.603 0.605 0.607 0.609 0.611 0.613 0.615 65 0.617 0.619 0.621 0.623 0.626 0.628 0.630 0.632 0.634 0.636 66 0.638 0.640 0.642 0.644 0.646 0.648 0.651 0.653 0.655 0.657 67 0.659 0.661 0.664 0.666 0.668 0.670 0.672 0.674 0.677 0.679 68 0.681 0.684 0.686 0.688 0.690 0.692 0.695 0.697 0.699 0.701 69 0.704 0.706 0.708 0.711 0.713 0.715 0.717 0.720 0.722 0.725 70 0.727 0.729 0.732 0.734 0.736 0.739 0.741 0.744 0.746 0.748 71 0.751 0.753 0.756 0.758 0.761 0.763 0.766 0.768 0.771 0.773 72 0.776 0.778 0.781 0.783 0.785 0.787 0.790 0.792 0.795 0.797 73 0.801 0.803 0.806 0.809 0.811 0.814 0.817 0.819 0.822 0.824 74 0.827 0.830 0.832 0.835 0.838 0.840 0.843 0.846 0.849 0.851 75 0.854 0.857 0.860 0.862 0.865 0.868 0.871 0.873 0.876 0.879 76 0.882 0.885 0.887 0.890 0.893 0.896 0.899 0.902 0.905 0.908 77 0.910 0.913 0.916 0.919 0.922 0.925 0.928 0.931 0.934 0.937 78 0.940 0.943 0.946 0.949 0.952 0.955 0.958 0.961 0.964 0.967 79 0.970 0.973 0.976 0.979 0.983 0.986 0.989 0.992 0.995 0.998 80 1.001 1.005 1.008 1.011 1.014 1.017 1.021 1.024 1.027 1.030 81 1.034 1.037 1.040 1.043 1.047 1.050 1.053 1.057 1.060 1.063 82 1.067 1.069 1.073 1.077 1.080 1.083 1.087 1.090 1.094 1.097 83 1.101 1.104 1.108 1.111 1.114 1.118 1.121 1.125 1.129 1.132 84 1.136 1.139 1.143 1.146 1.150 1.153 1.157 1.160 1.164 1.167 85 1.171 1.175 1.178 1.182 1.186 1.190 1.193 1.197 1.201 1.205 86 1.209 1.212 1.216 1.220 1.224 1.228 1.232 .235 1.239 1.243 87 1.247 1.251 1.255 1.258 1.262 1.266 1.270 .274 1.278 1.282 88 1.286 1.290 1.294 1.298 1.302 1.306 1.310 .314 1.318 1.322 89 1.326 1.330 1.335 1.339 1.343 1.347 1.351 .355 1.359 1.364 90 1.368 1.372 1.376 1.381 1.385 1.389 1.393 .397 1.402 1.406 O. 1. 2. 3. 4. 5. 6. 7. 8. 9. B 101 XII. PSYCHROMETRICAL TABLE, GIVING THE TEMPERATURE OF THE DEW-POINT, THE FORCE AND THE WEIGHT OF VAPOR IN THE ATMOSPHERE, AND ITS RELATIVE HUMIDITY, DEDUCED FROM THE INDICATIONS OF THE PSYCHROMETER, OR DRY AND WET BULB THERMOMETERS. BY JAMES GLAISHER. THIS elaborate table, first published in London, in 1847, in pamphlet form, by J. Glaisher, of the Roj'al Observatory at Greenwich, is based on the tables of elastic forces of vapor deduced from Dalton's experiments, and given above, Table XL The weight of a cubic foot of dry air at 32° Fahrenheit, and under the barometric pressure of 30 inches, which has been adopted by Glaisher, and from which the weight of vapor in a cubic foot of air is derived, is the mean of the determinations obtained by Shuckburgh and by Biot and Arago, which is 563.2154 grains Troy ; 563 being the number actually used in the calculations. See Preface to the Table, p. 13, and also the Greenwich Meteorological Observations for 1842, p. xlvi. The coefficient of the expansion of air which has been employed is that deter- mined by the experiments of Gay-Lussac, according to which the air expands 0.00375 of its bulk for 1° Centigrade, or ¥J^ for 1° Fahrenheit. All these values, as may be seen by comparing Tables VI. and XI. of the elastic forces, and also page 92, materially differ from those more recently determined with great care by Regnault, and on which are based the Psychrometrical Tables given above, page 50 et seq. This will account for the no inconsiderable differences often found between the results in the two tables derived from the same data. A few examples, taken from various parts of the tables, may be given here, in order to enable the meteorologist to judge of the amount of the discrepancies which may occur in the results when computed from different hygrometrical constants. 1. Suppose the temperature of the air indicated by the dry thermome- ter to be — 10° F. The temperature of evaporation indicated by the wet thermometer = 9° F. Difference 1° F. Then, Glaisher's table gives, The Force of Vapor = 0.065 inch. The Relative Humidity = 0.730 Guyot's table gives, The Force of Vapor = 0.054 inch . The Relative Humidity = 0.791 B 102 PSYCHROMETRICAL TABLE. 2. By observation we have, , Dry Thermometer = 50° F. Wet Thermometer = 40° F. Difference = 10° F. Then, by Glaisher's table, we find, Force of Vapor = 0.186 inch. Relative Humidity = 0.495 And by Guyot's table, we find, Force of Vapor = 0.117 inch. Relative Humidity = 0.322 3. The reading of the Dry Thermometer is = 90° F. Wet Thermometer is = TO^F. Difference = 20° F. By Glaisher's table we have, Force of Vapor = 0.523 inch. Relative Humidity = 0.381 And by Guyot's table, Force of Vapor = 0.464 inch. Relative Humidity = 0.329 The temperatures of the Dew-Point, given in Glaisher's tables, have been com- puted by means of the empirical factors given below, page 140, and in the manner there described. See Preface to the Table, page 11. ARRANGEMENT OF THE TABLE. In the first two columns, at the left, are found the indications, in degrees of Fah- renheit, of the dry and wet bulb thermometers. In the following columns, in their order, and opposite to each of the temperatures of the wet thermometer, are given the temperature of the dew-point ; the force of vapor, in English inches ; the weight of vapor, in grains, contained in a cubic foot of air ; the amount of the same required for saturation ; and the relative humidity in thousandths, corresponding to the differ- ence of temperature between the two thermometers. The second half of the page, at the right, furnishes, in seven columns, the weight, in grains, of a cubic foot of air, under various barometric pressures from 28 to 31 inches, and in the different hygro- metric conditions indicated by the differences of the two thermometers. These numbers have been computed in the manner described below, page 142. The range of the table extends from 10° to 90° of the dry thermometer, or of the temperature of the air. From 10° to 34° Fahrenheit the results are calculated for every second, third, and fifth of a degree of the wet thermometer, and for ex- treme differences of the temperature of evaporation ranging from 2° to 5° below the temperature of the air. From 34° to 90° the results are given only for every full degree of the wet thermometer, and for extreme differences gradually increasing B 103 PSYCHROMETRICAL TABLE. °. This range falls short of the wants of the extreme climate of North America, where temperatures above 90° and far below 10° are of usual occurrence over a great portion of the continent. The same may be said of the range of the differences between the two thermometers in the first part of the table. The double interpolation for the fractions of degrees of both thermometers being rather too large to be neglected, its application becomes inconvenient. USE OF THE TABLE. Enter the table with the observed temperatures of the dry and wet bulb thermom- eters. On the same line as the last, and in their appropriate columns, the results deduced from these data will be found. Example. The observation has given, - Temperature of the air by the dry thermometer = 62° F. Temperature of evaporation by the wet-bulb thermometer = 53° F. Page 129, find in the first column, headed Reading of the Dry Thermometer, the temperature of 62°, and in the second, that of the wet, 53°. On the line beginning with 53° are found, in their respective columns, the results deduced from these data, viz. : — The temperature of the Dew-point = 46°. 7 F. The force of vapor in the air = 0.333 inch. The weight of vapor in a cubic foot of air = 3.72 grains. The amount of vapor required for saturation = 2.53 grains. The relative humidity in thousandths = 0.595 104 XII. PSYCHROMETRICAL TABLES. Reading of Ther- mometer, Fahr. !emp. of Dew- Point, Fahr. Force of Vapor in Snglish nches. Weight of Vapor Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. neqa. for Sat'n. faCu- icFt. f Air. Height of the Barometer in English Inches. Dry. Wet. in. 28.0 in. 28.5 in. 29.0 in. 29.5 in. 3O.O in. 30.5 in. 31.0 o o o in. gr- gr. gr. gr- gr- gr- gr- gr. gr- 10 10.0 10.0 0.089 1.11 0.00 1.000 550.1 560.0 569.8 579.6 589.4 599.2 609.0 9.8 8.3 0.084 1.05 0.06 0.946 550.2 560.1 569.9 579.7 589.5 599.3 609.1 9.6 6.6 0.079 0.98 0.13 0.883 550.2 560.1 569.9 579.7 589.5 599.3 609.1 9.4 4.9 0.074 0.92 0.19 0.829 550.2 560.1 569.9 579.7 589.5 599.3 609.1 9.2 3.2 0.069 0.86 0.25 0.775 550.3 560.2 570.0 579.8 589.6 599.4 609.2 9.0 1.5 0.065 0.81 0.30 0.730 550.3 560.3 570.0 579.8 589.6 599.4 609.3 11 11.0 11.0 0.093 1.15 0.00 1.000 548.9 558.7 568.5 578.3 588.1 597.9 607.7 10.8 9.3 0.087 1.08 0.07 0.939 548.9 558.7 568.5 578.3 588.1 597.9 607.7 10.6 7.6 0.082 1.02 0.13 0.887 549.0 558.8 568.6 578.4 588.2 598.0 607.8 10.4 5.9 0.077 0.96 0.19 0.835 549.0 558.8 568.6 578.4 588.2 598.0 607.8 10.2 4.2 0.072 0.90 0.25 0.783 549.0 558.8 568.6 578.4 588.2 598.0 607.8 10.0 2.5 0.067 0.84 0.31 0.731 549.1 558.9 568.7 578.6 588.3 598.1 607.9 9.8 0.8 0.063 0.78 0.37 0.679 549.1 558.9 568.7 578.6 588.3 598.1 607.9 12 12.0 12.0 0.096 1.19 0.00 1.000 547.7 557.5 567.2 577.0 586.8 596.6 606.4 11.8 10.3 0.090 1.12 0.07 0.942 547.7 557.5 567.2 577.0 586.8 596.6 606.4 11.6 8.6 0.085 1.05 0.14 0.883 547.8 557.6 567.3 577.1 586.9 596.7 606.5 11.4 6.9 0.080 0.99 0.20 0.832 547.8 557.6 567.3 577.1 586.9 596.7 606.5 11.2 5.2 0.075 0.93 0.26 0.782 547.8 557.6 567.3 577.1 586.9 596.7 606.5 11.0 3.5 0.070 0.87 0.32 0.731 547.9 557.7 567.4 577.2 587.0 596.8 606.6 10.8 1.8 0.066 0.81 0.38 0.681 547.9 557.7 567.4 577.2 587.0 596.8 606.6 10.6 0.1 0.061 0.76 0.43 0.639 547.9 557.7 567.4 577.2 587.0 596.8 606.6 13 13.0 13.0 0.100 1.24 0.00 1.000 546.5 556.3 566.0 575.8 585.5 595.3 605.0 12.8 11.3 0.094 1.16 0.08 0.936 546.5 556.3 566.0 575.8 585.5 595.3 605.0 12.6 9.6 0.088 1.08 0.16 0.871 546.6 556.4 566.1 575.9 585.6 595.4 605.1 12.4 7.9 0.083 1.02 0.22 0.823 546.7 556.5 566.2 576.0 585.7 595.5 605.2 12.2 6.2 0.077 0.97 0.27 0.783 546.7 556.5 566.2 576.0 585.7 595.5 605.2 12.0 4.5 0.073 0.91 0.33 0.734 546.7 556.5 566.2 576.0 585.7 595.5 605.2 11.8 2.8 0.068 0.84 0.40 0.678 546.8 556.6 566.3 576.1 585.8 595.6 605.3 11.6 1.1 0.064 0.79 0.45 0.637 546.8 556.6 566.3 576.1 585.8 595.6 605.3 14 14.0 14.0 0.104 1.28 0.00 1.000 545.3 555.0 564.7 574.4 584.2 594.0 603.7 13.8 12.3 0.097 1.20 0.08 0.938 545.3 555.0 564.7 574.4 584.2 594.0 603.7 13.6 10.6 0.091 1.12 0.16 0.875 545.4 555.1 564.8 574.5 584.3 594.1 603.8 13.4 8.9 0.086 1.06 0.22 0.828 545.4 555.1 564.8 574.5 584.3 594.1 603.8 13.2 7.2 0.080 1.00 0.28 0.782 545.4 555.1 564.8 574.5 584.3 594.1 603.8 13.0 5.5 0.075 0.93 0.35 0.727 545.5 555.2 564.9 574.6 584.4 594.2 603.9 12.8 3.8 0.071 0.87 0.41 0.680 545.5 555.2 564.9 574.6 584.4 594.2 603.9 12.6 2.1 0.066 0.82 0.46 0.641 545.6 555.3 565.0 574.7 584.5 594.2 603.9 15 15.0 15.0 0.108 1.32 0.00 1.000 544.0 553.8 563.5 573.2 582.9 592.6 602.3 14.8 13.3 0.101 1.24 0.08 0.940 544.0 553.8 563.5 573.2 582.9 592.6 602.3 14.6 11.6 0.095 1.16 0.16 0.879 544.1 553.9 563.6 573.3 583.0 592.7 602.4 14.4 9.9 0.089 1.10 0.22 0.833 544.1 553.9 563.6 573.3 583.0 592.7 602.4 14.2 8.2 0.083 1.04 0.28 0.788 544.2 554.0 563.7 573.4 583.1 592.8 602.5 14.0 6.5 0.078 0.97 0.35 0.735 544.2 554.0 563.7 573.4 583.1 592.8 602.5 13.8 4.8 0.073 0.90 0.42 0.682 544.2 554.0 563.7 573.4 583.1 592.8 602.5 13.6 3.1 0.069 0.85 0.47 0.644 544.3 554.1 563.8 573.5 583.2 592.9 602.6 B 105 PSYCHROMETRICAL TABLES. Reading of Ther- mometer, Fahr. Temp, of Dew- Point, Fahr. Force of Vapor in English Inches. Weight of Vapor Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. xtequ. for Sat'n. ofaCu- bic Ft. of Air. Height of the Barometer in English Inches. in. 28.0 in. 28.5 in. 29.0 in. 29.5 in. 30.0 in. 30.5 in. 31.0 Dry. Wet. o 16 0 16.0 o 16.0 in. 0.112 gr- 1.37 gr. 0.00 1.000 gr. 542.8 gr- 552.5 gr. 56212 gr. 571.9 gr. 581.6 gr. 591.3 gr. 601.0 15.8 14.3 0.105 1.29 0.08 0.942 542.9 552.6 562.3 572.0 581.7 591.4 601.1 15.6 12.6 0.098 1.21 0.16 0.883 542.9 552.6 562.3 572.0 581.7 591.4 601.1 15.4 10.9 0.092 1.14 0.23 0.832 543.0 552.7 562.4 572. 581.8 591.5 601.2 15.2 9.2 0.087 1.07 0.30 0.781 543.0 552.7 562.4 572. 581.8 591.5 601.2 15.0 7.5 0.081 1.00 0.37 0.730 543.0 552.7 562.4 572. 581.8 591.5 601.2 14.8 5.8 0.076 0.94 0.43 0.686 543.1 552.8 562.5 572. 581.9 591.6 601.3 14.6 4.1 0.072 0.88 0.49 0.643 543.1 552.8 562.5 572. 581.9 591.6 601.3 17 17.0 17.0 0.116 .41 0.00 1.000 541.3 551.0 560.8 570.5 580.1 589.8 599.4 16.8 15.3 0.109 .33 0.08 0.943 541.3 551.0 560.8 570.5 580.1 589.8 599.4 16.6 13.6 0.102 .25 0.16 0.8S7 541.4 551.1 560.9 570.6 580.2 589.9 599.5 16.4 11.9 0.096 .17 0.24 0.830 541.4 551.1 560.9 570.6 580.2 589.9 599.5 16.2 10.2 0.090 .10 0.31 0.780 541.5 551.2 561.0 570.7 580.3 590.0 599.6 16.0 8.5 0.084 .03 0.38 0.730 541.5 551.2 561.0 570.7 580.3 590.0 599.6 15.8 6.8 0.079 0.97 0.44 0.688 541.5 551.2 561.0 570.7 580.3 590.0 599.6 15.6 5.1 0.074 0.91 0.50 0.646 541.6 551.3 561.1 570.8 580.4 590.1 599.7 18 18.0 18.0 0.120 .47 0.00 1.000 540.5 550.2 559.8 569.5 579.1 588.8 598.4 17.8 16.3 0.113 .38 0.09 0.939 540.5 550.2 559.8 569.5 579.1 588.8 598.4 17.6 14.6 0.106 .29 0.18 0.878 540.6 550.3 559.9 569.6 579.2 588.9 598.5 17.4 12.9 0.099 .21 0.26 0.824 540.6 550.3 559.9 569.6 579.2 588.9 598.5 17.2 11.2 0.093 .14 0.33 0.776 540.7 550.4 560.0 569.7 579.3 589.0 598.6 17.0 9.5 0.088 .07 0.40 0.728 540.7 550.4 560.0 569.7 579.3 589.0 598.6 16.8 7.8 0.082 .01 0.46 0.688 540.7 550.5 560.1 569.8 579.3 589.0 598.6 16.6 6.1 0.077 0.95 0.52 0.647 540.8 550.6 560.2 569.9 579.4 589.1 598.7 19 19.0 19.0 0.125 1.52 0.00 1.000 539.3 548.9 558.5 568.2 577.8 587.5 597.1 18.8 17.3 0.117 1.43 0.09 0.941 539.3 548.9 558.5 568.2 577.8 587.5 597.1 18.6 15.6 0.110 1.34 0.18 0.882 539.4 549.0 558.6 568.3 577.9 587.6 597.2 18.4 13.9 0.103 1.26 0.26 0.829 539.4 549.0 558.6 568.3 577.9 587.6 597.2 18.2 12.2 0.097 1.18 0.34 0.776 539.5 549.1 558.7 568.4 578.0 587.7 597.3 18.0 10.5 0.091 1.11 0.41 0.730 539.5 549.1 558.7 568.4 578.0 587.7 597.3 17.8 8.8 0.085 1.04 0.48 0.684 539.6 549.2 558.8 568.5 578.1 .587.8 597.4 17.6 7.1 0.080 0.98 0.54 0.645 539.6 549.2 558.8 568.5 578.1 587.8 597.4 20 20.0 20.0 0.129 1.58 0.00 1.000 538.1 547.7 557.3 566.9 576.5 586.1 595.7 19.8 18.3 0.121 1.48 0.10 0.937 538.2 547.8 557.4 567.0 576.6 586.2 595.8 19.6 16.6 0.114 1.38 0.20 0.874 538.3 547.9 557.5 567.1 576.7 586.3 595.9 19.4 14.9 0.107 1.30 0.28 0.823 538.3 547.9 557.5 567.1 576.7 586.3 595.9 19.2 13.2 0.101 1.23 0.35 0.779 538.3 547.9 557.5 567.1 576.7 586.3 595.9 19.0 11.5 0.094 1.15 0.43 0.728 538.4 548.0 557.6 567.2 576.8 586.4 596.0 18.8 9.8 0.089 1.08 0.50 0.684 538.4 548.0 557.6 567.2 576.8 586.4 596.0 18.6 8.1 0.083 1.01 0.57 0.639 538.5 548.1 557.7 567.3 576.9 586.5 596.1 18.4 6.4 0.078 0.95 0.63 0.601 538.5 548.1 557.7 567.3 576.9 586.5 596.1 B 106 PSYCHROMETRICAL TABLES. Reading of Ther- mometer, Fahr. Temp, of Dew- Point, Fahr. Force of Tapor English Inches. Weight of Vapor Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. jxequ. for Sat'n. ofaCu- bic Ft. of Air. Height of the Barometer in English Inches. Dry. o 21 Wet. in. 28.O in. 28.5 in. 29.0 in. 29.5 in. 3O.O in. 30.5 in. 31.O o 21.0 o 21.0 in. 0.134 gr- 1.63 gr- 0.00 1.000 gr. 537.0 gr- 546.6 gr. 556.1 gr. 565.7 gr. 575.3 gr. 584.9 gr. 594.5 20.8 19.3 0.126 1.53 0.10 0.939 537.0 546.6 556.1 565.7 575.3 584.9 594.5 20.6 17.6 0.118 1.44 0.19 0.884 537.1 546.7 556.2 565.8 575.4 5&5.0 594.6 20.4 15.9 0.111 1.36 0.27 0.835 537.1 546.7 556.2 565.8 575.4 585.0 594.6 20.2 14.2 0.104 1.28 0.35 0.785 537.2 546.8 556.3 565.9 575.5 585.1 594.7 20.0 12.5 0.098 1.20 0.43 0.736 537.2 546.8 556.3 565.9 575.5 585.1 594.7 19.8 10.8 0.092 1.12 0.51 0.687 537.3 546.9 556.4 566.0 575.6 585.2 594.8 19.6 9.1 0.086 1.05 0.58 0.644 537.3 546.9 556.4 566.0 575.6 585.2 594.8 19.4 7.4 0.081 0.99 0.64 0.607 537.3 546.9 556.4 566.0 575.6 585.2 594.8 22 22.0 22.0 0.139 1.69 0.00 1.000 535.7 545.3 554.9 564.5 574.0 583.6 593.1 21.8 20.3 0.131 1.59 0.10 0.941 535.8 545.4 555.0 564.6 574.1 583.7 593.2 21.6 18.6 0.123 1.49 0.20 0.882 535.8 545.4 555.0 564.6 574.1 583.7 593.2 21.4 16.9 0.115 1.40 0.29 0.828 535.9 545.5 555.1 564.7 574.2 583.8 593.3 21.2 15.2 0.108 1.31 0.38 0.775 535.9 545.5 555.1 564.7 574.2 583.8 593.3 21.0 13.5 0.102 1.23 0.46 0.728 536.0 545.6 555.2 564.8 574.3 583.9 593.4 20.8 11.8 0.096 1.16 0.53 0.686 536.0 545.6 555.2 564.8 574.3 583.9 593.4 20.6 10.1 0.090 1.09 0.60 0.645 536.1 545.7 555.3 564.9 574.4 584.0 593.5 20.4 8.4 0.084 1.02 0.67 0.604 536.1 545.7 555.3 564.9 574.4 584.0 593.5 20.2 6.7 0.079 0.96 0.73 0.568 536.1 545.7 555.3 564.9 574.4 584.0 593.5 23 23.0 23.0 0.144 1.75 0.00 1.000 534.6 544.2 553.7 563.3 572.8 582.4 591.9 22.8 21.3 0.136 1.65 0.10 0.943 534.6 544.2 553.7 563.3 572.8 582.4 591.9 22.6 19.6 0.127 1.55 0.20 0.886 534.7 544.3 553.8 563.4 572.9 582.5 592.0 22.4 17.9 0.120 1.45 0.30 0.829 534.7 544.3 553.8 563.4 572.9 582.5 592.0 22.2 16.2 0.112 1.36 0.39 0.777 534.8 544.4 553.9 563.5 573.0 582.6 592.1 22.0 14.5 0.106 1.28 0.47 0.731 534.8 544.4 553.9 563.5 573.0 582.6 592.1 21.8 12.8 0.099 1.21 0.54 0.691 534.9 544.5 554.0 563.6 573.1 582.7 592.2 21.6 11.1 0.093 1.13 0.62 0.646 534.9 544.5 554.0 563.6 573.1 582.7 592.2 21.4 9.4 0.087 1.06 0.69 0.606 535.0 544.6 554.1 563.7 573.2 582.8 592.3 21.2 7.7 0.082 1.00 0.75 0.571 535.0 544.6 554.1 563.7 573.2 582.8 592.3 24 24.0 24.0 0.150 1.81 0.00 1.000 533.4 542.9 552.4 562.0 571.5 581.1 590.6 23.8 22.5 0.142 1.72 0.09 0.951 533.5 543.0 552.5 562.1 571.6 581.2 590.7 23.6 21.1 0.135 1.63 0.18 0.901 533.5 543.1 552.5 562.1 571.6 581.2 590.7 23.4 19.6 0.127 1.55 0.26 0.856 533.6 543.2 552.6 562.2 571.7 581.3 590.8 23.2 18.2 0.121 1.46 0.35 0.807 533.6 543.2 552.6 562.2 571.7 581.3 590.8 23.0 16.7 0.115 1.38 0.43 0.762 533.7 543.3 552.7 562.3 571.8 581.4 590.9 22.8 15.2 0.108 1.31 0.50 0.724 533.7 543.3 552.7 562.3 571.8 581.4 590.9 22.6 13.8 0.103 1.24 0.57 0.685 533.7 543.3 552.7 562.3 571.8 581.4 590.9 22.4 12.3 0.097 1.18 0.63 0.652 533.8 543.4 552.8 562.4 571.9 581.5 591.0 22.2 10.8 0.091 1.12 0.69 0.634 533.8 543.4 552.8 562.4 571.9 581.5 591.0 B 107 PSYCHROMETRICAL TABLES. Reading of Ther- mometer, Fahr. Temp, of Dew- Point, Fahr. Force of Vapor in English Inches. Weight of Vapoi Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. jvequ. for Sat'n. ofaCu- bic Ft. of Air. Height of the Barometer in English Inches. in. 28.0 in. 28.5 in. 29.0 in. 29.5 in. 30.0 in. 30.5 in. 31.0 Dry. Wet. o o 0 in. gr. gr. gr. gr. gr- gr. gr. gr- gr- 25 25.0 25.0 0.155 1.87 0.00 1.000 532.3 541.8 551.3 560.8 570.3 579.8 589.3 24.8 23.7 0.148 1.78 0.09 0.952 532.3 541.8 551.3 560.8 570.3 579.8 589.3 24.6 22.4 0.141 1.70 0.17 0.909 532.4 541.9 551.4 560.9 570.4 579.9 589.4 24.4 21.2 0.135 1.62 0.25 0.867 532.4 541.9 551.4 560.9 570.4 579.9 589.4 24.2 19.9 0.129 1.55 0.32 0.829 532.4 541.9 551.4 560.9 570.4 579.9 589.4 24.0 18.6 0.123 1.48 0.49 0.791 532.5 542.0 551.5 561.0 570.5 580.0 589.5 23.8 17.3 0.117 1.41 0.46 0.754 532.5 542.0 551.5 561.0 570.5 580.0 589.5 23.6 16.0 0.112 1.34 0.53 0.717 532.6 542.1 551.6 561.1 570.6 580.1 589.6 23.4 14.8 0.107 1.28 0.59 0.685 532.6 542.1 551.6 561.1 570.6 580.1 589.6 23.2 13.5 0.102 1.22 0.65 0.653 532.6 542.1 551.6 561.1 570.6 580.1 589.6 26 26.0 26.0 0.161 1.93 0.00 1.000 531.1 540.6 550.0 559.5 569.0 578.5 588.0 25.8 24.8 0.154 1.85 0.08 0.959 531.2 540.7 550.1 559.6 569.1 578.6 588.1 25.6 23.6 0.147 1.78 0.15 0.923 531.2 540.7 550.1 559.6 569.1 578.6 588.1 25.4 22.3 0.141 1.70 0.23 0.881 531.2 540.7 550.1 559.6 569.1 578.6 588.1 25.2 21.2 0.135 1.62 0.31 0.839 531.3 540.8 550.2 559.7 569.2 578.7 588.2 25.0 19.9 0.129 1.55 0.38 0.804 531.3 540.8 550.2 559.7 569.2 578.7 588.2 24.8 18.7 0.123 1.48 0.45 0.767 531.4 540.9 550.3 559.8 569.3 578.8 588.3 24.6 17.5 0.118 1.41 0.52 0.731 531.4 540.9 550.3 559.8 569.3 578.8 588.3 24.4 16.2 0.112 1.35 0.58 0.700 531.4 540.9 550.3 559.8 569.3 578.8 588.3 24.2 15.0 0.108 1.29 0.64 0.668 531.5 541.0 550.4 559.9 569.4 578.9 588.4 27 27.0 27.0 0.167 2.00 0.00 1.000 529.9 539.4 548.9 558.4 567.8 577.3 586.7 26.7 25.2 0.156 1.88 0.12 0.940 529.9 539.4 548.9 558.4 567.8 577.4 586.8 26.4 23.3 0.146 1.76 0.24 0.880 530.0 539.5 549.0 558.5 567.9 577.5 586.9 26.1 21.5 0.137 1.64 0.36 0.820 530.1 539.6 549.1 558.6 568.0 577.6 587.0 25.8 19.7 0.128 1.53 0.47 0.765 530.1 539.6 549.1 558.6 568.0 577.6 587.0 25.5 17.8 0.119 1.43 0.57 0.715 530.2 539.7 549.2 558.7 568.1 577.7 587.1 25.2 16.0 0.112 1.34 0.66 0.670 530.3 539.8 549.3 558.8 568.2 577.8 587.2 24.9 14.2 0.104 1.26 0.74 0.630 530.3 539.8 549.3 558.8 568.2 577.8 587.2 24.6 12.4 0.098 1.17 0.83 0.585 530.4 539.9 549.4 558.9 568.3 577.9 587.3 24.3 10.5 0.091 1.09 0.91 0.545 530.5 540.0 549.5 559.0 568.3 577.9 587.3 28 28.0 28.0 0.173 2.07 0.00 1.000 528.7 538.1 547.6 557.0 566.5 575.9 585.4 27.7 26.3 0.163 1.95 0.12 0.942 528.8 538.2 547.7 557.1 566.6 576.0 585.5 27.4 24.6 0.153 .84 0.23 0.889 528.9 538.3 547.8 557.2 566.7 576.1 585.6 27.1 22.9 0.144 .73 0.34 0.836 528.9 538.3 547.8 557.2 566.7 576.1 585.6 26.8 21.2 0.135 .62 0.45 0.783 529.0 538.4 547.9 557.3 566.8 576.2 585.7 26.5 19.4 0.126 .52 0.55 0.734 529.1 538.5 548.0 557.4 566.9 576.3 585.8 26.2 17.7 0.119 .42 0.65 0.686 529.1 538.5 548.0 557.4 566.9 576.3 585.8 25.9 16.0 0.112 .34 0.73 0.648 529.2 538.6 548.1 557.5 567.0 576.4 585.9 25.6 14.3 0.105 .26 0.82 0.604 529.2 538.6 548.1 557.5 567.0 576.4 585.9 25.3 12.6 0.098 .18 0.89 0.571 529.2 538.6 548.1 557.5 567.0 576.4 585.9 B 108 PSYCHROMETRICAL TABLES. Reading of Ther- mometer. Fahr. Temp, of Dew- Point, Fahr. Force of Vapor in English Inches. Weight of Vapor Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. jxequ. for Sat'n. ofaCu- bic Ft. of Air. Height of the Barometer in English Inches. Dry. 0 29 Wet. in. 28.0 in. 28.5 in. 29.0 in. 29.5 in. 30.0 in. 30.5 in. 31.0 o 29.0 o 29.0 in. 0.179 gr. 2.14 gr. 0.00 1.000 gr. 527.6 gr. 537.0 gr. 546.5 gr. 555.9 gr. 565.3 gr. 574.7 gr- 584.1 28.7 27.5 0.170 2.03 0.11 0.949 527.7 537.1 546.6 556.0 565.4 574.8 584.2 28.4 26.0 0.161 .92 0.22 0.898 527.7 537.1 546.6 556.0 565.4 574.8 584.2 28.1 24.5 0.152 .82 0.32 0.851 527.8 537.2 546.7 556.1 565.5 574.9 584.3 27.8 23.0 0.144 .73 0.41 0.809 527.8 537.2 546.7 556.1 565.5 574.9 584.3 27.5 21.5 0.137 .64 0.50 0.766 527.9 537.3 546.7 556.2 565.6 575.0 584.5 27.2 20.0 0.129 .55 0.59 0.725 528.0 537.4 546.8 556.2 565.7 575.1 584.6 26.9 18.5 0.122 .47 0.67 0.687 528.0 537.4 546.8 556.3 565.7 575.2 584.6 26.6 17.0 0.116 .38 0.76 0.645 528.1 537.5 546.9 556.4 565.8 575.3 584.7 26.3 15.5 0.110 .30 0.84 0.617 528.1 537.5 546.9 556.4 565.8 575.3 584.7 30 30.0 30.0 0.186 2.21 0.00 1.000 526.5 535.9 545.3 554.7 564.1 573.5 582.9 29.7 28.6 0.177 2.10 0.11 0.951 526.5 535.9 545.3 554.7 564.1 573.5 582.9 29.4 27.2 0.168 2.00 0.21 0.905 526.6 536.0 545.4 554.8 564.2 573.6 583.0 29.1 25.9 0.160 1.91 0.30 0.864 526.7 536.1 545.5 554.9 564.3 573.7 583.1 28.8 24.5 0.152 1.82 0.39 0.824 526.7 536.1 545.5 554.9 564.3 573.7 583.1 28.5 23.1 0.145 .73 0.48 0.783 526.8 536.2 545.6 555.0 564.4 573.8 583.2 28.2 21.7 0.138 .64 0.57 0.742 526.8 536.2 545.6 555.0 564.4 573.8 583.2 27.9 20.3 0.131 .56 0.65 0.706 526.9 536.3 545.7 555.1 564.5 573.9 583.3 27.6 19.0 0.125 .49 0.72 0.674 526.9 536.3 545.7 555.1 564.5 573.9 583.3 27.3 17.6 0.118 .42 0.79 0.643 527.0 536.4 545.8 555.2 564.6 574.0 583.4 31 31.0 31.0 0.192 2.29 0.00 1.000 525.4 534.7 544.1 553.5 562.9 572.3 581.7 30.7 29.9 0.185 2.20 0.09 0.961 525.4 534.7 544.1 553.5 562.9 572.3 581.7 30.4 28.8 0.178 2.12 0.17 0.926 525.5 534.8 544.2 553.6 563.0 572.4 581.8 30.1 27.7 0.171 2.04 0.25 0.891 525.5 534.8 544.2 553.6 563.0 572.4 581.8 29.8 26.6 0.164 1.95 0.34 0.852 525.6 534.9 544.3 553.7 563.1 572.5 581.9 29.5 25.5 0.158 1.87 0.42 0.817 525.6 534.9 544.3 553.7 563.1 572.5 581.9 29.2 24.4 0.152 1.80 0.49 0.786 525.6 534.9 544.3 553.7 563.1 572.5 581.9 28.9 23.4 0.146 1.73 0.56 0.756 525.7 535.0 544.4 553.8 563.2 572.6 582.0 28.6 22.3 0.141 1.67 0.62 0.729 525.7 535.0 544.4 553.8 563.2 572.6 582.0 28.3 21.2 0.135 1.60 0.69 0.699 525.7 535.0 544.4 553.8 563.2 572.6 582.0 32 32.0 32.0 0.199 2.37 0.00 1.000 524.2 533.5 542.9 552.3 561.6 570.9 580.3 31.6 30.8 0.191 2.27 0.10 0.958 524.3 533.6 543.0 552.4 561.7 571.0 580.4 31.2 29.5 0.182 2.17 0.20 0.916 524.4 533.7 543.1 552.5 561.8 571.1 580.5 30.8 28.3 0.175 2.07 0.30 0.874 524.4 533.7 543.1 552.5 561.8 571.1 580.6 30.4 27.0 0.167 1.98 0.39 0.836 524.5 533.8 543.2 552.6 561.9 571.2 580.6 30.0 25.8 0.160 .90 0.47 0.802 524.5 533.8 543.2 552.6 561.9 571.2 580.6 29.6 24.6 0.153 .82 0.55 0.768 524.6 533.9 543.3 552.7 562.0 571.3 580.7 29.2 23.3 0.146 .74 0.63 0.735 524.6 533.9 543.3 552.7 562.0 571.3 580.7 28.8 22.1 0.140 .67 0.70 0.705 524.6 533.9 543.3 552.7 562.0 571.3 580.7 28.4 20.8 0.133 .60 0.77 0.675 524.7 534.0 543.4 552.8 562.1 571.4 580.8 B 109 PSYCHROMETRICAL TABLES. Reading of Ther- mometer, Fahr. Temp, of Dew- Point, Fahr. Force of Vapor English Inches. Weight of Vapor Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. lujqu. for Sat'n. ofaCu- bic Ft. of Air. Height of the Barometer in English Inches. in. 28.O in. 28.5 in. 29.O in. 29.5 in. 3O.O in. 3O.5 in. 31.0 Dry. Wet. 0 o o in. gr. gr- gr. gr. gr- gr. gr. gr. gr- 33 33.0 33.0 0.207 2.45 0.00 1.000 523.0 532.3 541.7 551.1 560.4 569.7 579.1 32.5 31.6 0.197 2.33 0.12 0.951 523.1 532.5 541.8 551.2 560.5 569.8 579.2 32.0 30.2 0.187 2.22 0.23 0.906 523.2 532.6 541.9 551.3 560.6 569.9 579.3 31.5 28.8 0.178 2.11 0.34 0.862 523.3 532.7 542.0 551.4 560.7 570.0 579.4 31.0 27.4 0.169 2.01 0.44 0.821 523.3 532.7 542.0 551.4 560.7 570.0 579.4 30.5 26.0 0.161 1.91 0.54 0.780 523.4 532.8 542.1 551.5 560.8 570.1 579.5 30.0 24.6 0.153 1.82 0.63 0.743 523.4 532.8 542.1 551.5 560.8 570.1 579.5 29.5 23.2 0.145 1.74 0.71 0.711 523.5 532.9 542.2 551.6 560.9 570.2 579.6 29.0 21.8 0.138 1.65 0.80 0.674 523.5 532.9 542.2 551.6 560.9 570.2 579.6 28.5 20.4 0.131 1.57 0.88 0.641 523.6 533.0 542.3 551.7 561.0 570.3 579.7 34 34.0 34.0 0.214 2.53 0.00 1.000 521.9 531.2 540.6 549.9 559.2 568.5 577.8 33.5 32.7 0.204 2.42 0.11 0.957 522.0 531.4 540.7 550.0 559.3 568.6 577.9 33.0 31.4 0.195 2.31 0.22 0.913 522.0 531.4 540.7 550.0 559.3 568.6 577.9 32.5 30.1 0.186 2.21 0.32 0.874 522.1 531.5 540.8 550.1 559.4 568.7 578.0 32.0 28.8 0.178 2.11 0.42 0.834 522.1 531.5 540.8 550.1 559.4 568.7 578.0 31.5 27.5 0.170 2.01 0.52 0.795 522.2 531.6 540.9 550.2 559.5 568.8 578.1 31.0 26.2 0.162 1.91 0.62 0.755 522.3 531.7 541.0 550.3 559.6 568.9 578.2 30.5 24.9 0.155 1.83 0.70 0.724 522.3 531.7 541.0 550.3 559.6 568.9 578.2 30.0 23.6 0.147 1.75 0.78 0.692 522.4 531.8 541.1 550.4 559.7 569.0 578.3 29.5 22.3 0.141 1.67 0.86 0.660 522.4 531.8 541.1 550.4 559.7 569.0 578.3 29.0 21.0 0.134 1.59 0.94 0.629 522.5 531.9 541.2 550.5 559.8 569.1 578.4 35 35 35.0 0.222 2.62 0.00 1.000 520.8 530.1 539.4 548.7 558.0 567.3 576.6 34 32.5 0.203 2.40 0.22 0.916 520.9 530.2 539.5 548.8 558.1 567.4 576.7 33 30.0 0.186 2.19 0.43 0.836 521.0 530.3 539.6 548.9 558.3 567.5 576.8 32 27.5 0.170 2.00 0.62 0.764 521.1 530.4 539.7 549.0 558.4 567.6 576.9 31 25.0 0.155 1.83 0.79 0.698 521.2 530.5 539.8 549.1 558.5 567.7 577.0 30 22.5 0.142 1.68 0.94 0.641 521.3 530.6 539.9 549.2 558.6 567.8 577.1 29 20.0 0.129 1.53 1.09 0.584 521.3 530.7 540.0 549.3 558.6 567.9 577.2 28 17,5 0.117 1.39 1.23 0.531 521.4 530.8 540.1 549.4 558.7 568.0 577.3 27 15.0 0.108 1.27 1.35 0.485 521.5 530.9 540.2 549.5 558.7 568.1 577.4 36 36 36.0 0.230 2.71 0.00 1.000 519.7 529.0 538.3 547.5 556.8 566.1 575.4 35 33.5 0.210 2.48 0.23 0.915 519.8 529.1 538.4 547.6 556.9 566.2 575.5 34 31.0 0.192 2.27 0.44 0.838 519.9 529.2 538.5 547.7 557.0 566.3 575.6 33 28.5 0.176 2.07 0.64 0.764 520.0 529.3 538.6 547.8 557.1 566.4 575.7 32 26.0 0.161 1.89 0.82 0.698 520.1 529.4 538.7 547.9 557.2 566.5 575.8 31 23.5 0.147 1.74 0.97 0.642 520.2 529.5 538.8 548.0 557.3 566.6 575.9 30 21.0 0.134 1.58 1.13 0.583 520.3 529.6 538.9 548.1 557.4 566.7 576.0 29 18.5 0.122 1.45 1.26 0.535 520.4 529.7 539.0 548.2 557.5 566.8 576.1 28 16.0 0.112 1.32 1.39 0.487 520.5 529.8 539.1 548.3 557.6 566.9 576.2 B 110 PSYCHROMETRICAL TABLES. Reading of Ther- mometer, Fahr. Temp, of Dew- Point, Fahr. Force of Vapor in English Inches. Weight of Vapor Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. Reqd. for Sat'n. ofaCu- bic Ft. of Air. Height of the Barometer in English Inches. Dry. Wet. in. 28.0 in. 28.5 in. 29.0 in. 29.5 in. 3O.O in. 30.5 in. 31.O o 0 o in. gr- gr. gr. gr. gr- gr. gr. gr- gr. 37 37 37.0 0.238 2.80 0.00 1.000 518.6 527.8 537.1 546.3 555.6 564.8 574.1 36 34.5 0.218 2.56 0.24 0.914 518.7 527.9 537.2 546.4 555.7 564.9 574.2 35 32.0 0.199 2.35 0.45 0.839 518.8 528.0 537.3 546.5 555.8 565.0 574.3 34 29.5 0.182 2.14 0.66 0.764 518.9 528.1 537.4 546.6 555.9 565.1 574.4 33 27.0 0.167 1.96 0.84 0.700 519.0 528.2 537.5 546.7 556.0 565.2 574.5 32 24.5 0.152 1.79 1.01 0.640 519.1 528.3 537.6 546.8 556.1 565.3 574.6 31 22.0 0.139 1.64 1.16 0.586 519.2 528.4 537.7 546.9 556.2 565.4 574.7 30 19.5 0.127 1.50 1.30 0.536 519.3 528.5 537.8 547.1 556.3 565.5 574.8 29 17.0 0.116 1.37 1.43 0.489 519.4 528.6 537.9 547.2 556.4 565.6 574.9 38 38 38.0 0.246 2.89 0.00 1.000 517.4 526.6 535.9 545.1 554.4 563.6 572.9 37 35.5 0.226 2.65 0.24 0.917 517.5 526.7 536.0 545.2 554.5 563.7 573.0 36 33.0 0.207 2.43 0.46 0.841 517.6 526.8 536.1 545.3 554.6 563.8 573.1 35 30.5 0.189 2.22 0.67 0.768 517.7 526.9 536.2 545.4 554.7 563.9 573.2 34 28.0 0.173 2.03 0.86 0.703 517.8 527.0 536.3 545.5 554.8 564.0 573.3 33 25.5 0.158 1.85 1.04 0.640 517.9 527.1 536.4 545.6 554.9 564.1 573.4 32 23.0 0.144 1.70 1.19 0.588 518.0 527.2 536.5 545.7 555.0 564.2 573.5 31 20.5 0.132 1.54 1.35 0.533 518.1 527.3 536.6 545.8 555.1 564.3 573.6 30 18.0 0.120 1.39 1.50 0.481 518.2 527.4 536.7 545.9 555.2 564.4 573.7 39 39 39.0 0.255 2.99 0.00 1.000 516.3 525.5 534.7 543.9 553.2 562.4 571.6 38 36.5 0.234 2.74 0.25 0.917 516.4 525.6 534.8 544.0 553.3 562.5 571.7 37 34.0 0.214 2.51 0.48 0.840 516.5 525.7 534.9 544.1 553.4 562.6 571.8 36 31.5 0.196 2.30 0.69 0.769 516.6 525.8 535.0 544.2 553.5 562.7 571.9 35 29.0 0.179 2.10 0.89 0.703 516.7 525.9 535.1 544.3 553.6 562.8 572.1 34 26.5 0.164 1.91 1.08 0.639 516.8 526.0 535.2 544.4 553.7 562.9 572.2 33 24.0 0.150 1.76 1.23 0.589 516.9 526,1 535.3 544.5 553.8 563.0 572.3 32 21.5 0.137 1.60 1.39 0.535 517.0 526.2 535.4 544.6 553.9 563.1 572.4 31 19.0 0.125 1.46 1.53 0.488 517.1 526.3 535.6 544.8 554.1 563.3 572.6 30 16.5 0.114 1.32 1.67 0.442 517.2 526.4 535.7 544.9 554.2 563.4 572.7 40 40 40.0 0.264 3.09 0.00 1.000 515.2 524.4 533.6 542.8 552.0 561.2 570.4 39 37.8 0.245 2.86 0.23 0.926 515.3 524.5 533.7 542.9 552.1 561.3 570.5 38 35.6 0.227 2.65 0.44 0.858 515.4 524.6 533.8 543.0 552.2 561.4 570.6 37 33.4 0.210 2.45 0.64 0.793 515.5 524.7 533.9 543.1 552.3 561.5 570.7 36 31.2 0.194 2.27 0.82 0.734 515.6 524.8 534.0 543.2 552.4 561.6 570.8 35 29.0 0.179 2.09 .00 0.676 515.7 524.9 534.1 543.3 552.5 561.7 570.9 34 26.8 0.165 .94 .15 0.628 515.8 525.0 534.2 543.4 552.6 561.8 571.0 33 24.6 0.153 .79 .30 0.579 515.9 525.1 534.3 543.5 552.7 561.9 571.1 32 22.4 0.141 .65 .44 0.534 516.0 525.2 534.4 543.6 552.8 562.0 571.2 31 20.2 0.130 .53 .56 0.495 516.1 525.3 534.5 543.7 552.9 562.1 571.3 30 18.0 0.120 .42 .67 0.459 516.1 525.3 534.5 543.8 553.0 562.2 571.4 B III PSYCHROMETBICAL TABLES. Beading of Ther- Temp. Force Weight of Vapor Hu- 1 Weight in Grains of a Cubic Foot of Air. mometer, Fahr. of Dew- of Vapor In a itequ. for midity, Satura- Height of the Barometer in English Inches. in Cubic Sat'n. HOI! Point, Fahr. English Inches. Foot of Air. ofaCu- bic Ft. of Air. 1.000. in. 28.0 in. 28.5 in. 29.0 in. 29.5 in. 30.0 in. 3O.5 in. 31.O Dry. Wet. o o 0 in. gr- gr- gr. gr. gr- gr. gr. gr. gr- 41 41 41.0 0.274 3.19 0.00 1.000 514.1 523.3 532.5 541.6 550.8 560.0 569.2 40 38.8 0.253 2.96 0.23 0.928 514.2 523.4 532.6 541.7 550.9 560 1 569.3 39 36.6 0.235 2.74 0.45 0.859 514.3 523.5 532.7 541.8 551.0 560.2 569.4 38 34.4 0.217 2.54 0.65 0.796 514.4 523.6 532.8 541.9 551.1 560.3 569.5 37 32.2 0.201 2.35 0.84 0.737 514.5 523.7 532.9 542.0 551.2 560.4. 569.6 36 30.0 0.186 2.16 1.03 0.677 514.6 523.8 533.0 542.1 551.3 560.5 569.7 35 27.8 0.172 2.01 1.18 0.630 514.7 523.9 533.1 542.2 551.4 560.6 569.8 34 25.6 0.158 1.85 1.34 0.580 514.8 524.0 533.2 542.3 551.5 560.7 569.9 33 23.4 0.146 1.71 1.48 0.536 514.9 524.1 533.3 542.4 551.6 560.8 570.0 32 21.2 0.135 1.58 1.61 0.495 514.9 524.1 533.3 542.5 551.7 560.9 570.1 31 19.0 0.125 1.46 1.73 0.458 515.0 524.2 533.4 542.6 551.8 561.0 570.2 42 42 42.0 0.283 3.30 0.00 1.000 513.0 522.2 531.3 540.5 549.6 558.8 5679 41 39.8 0.263 3.06 0.24 0.927 513.1 522.3 531.4 540.6 549.7 558.9 568.0 40 37.6 0.243 2.83 0.47 0.858 513.2 522.4 531.5 540.7 549.9 559.0 568.1 39 35.4 0.225 2.63 0.67 0.797 513.3 522.5 531.6 540.8 550.0 559.1 568.2 38 33.2 0.208 2.43 0.87 0.736 513.4 522.6 531.7 540.9 550.1 559.2 568.3 37 31.0 0.192 2.24 1.06 0.679 513.5 522.7 531.8 541.0 550.2 559.3 568.4 36 28.8 0.178 2.08 .22 0.631 513.6 522.8 531.9 541.1 550.3 559.4 568.5 35 26.6 0.164 1.91 .39 0.579 513.7 522.9 532.0 541.2 550.4 559.5 568.6 34 24.4 0.152 1.77 .53 0.536 513.8 523.0 532.1 541.3 550.5 559.6 568.7 33 22.2 0.140 1.63 .67 0.494 513.9 523.1 532.2 541.4 550.6 559.7 568.8 32 20.0 0.129 1.51 .79 0.458 513.9 523.1 532.3 541.5 550.6 559.8 569.0 43 43 43.0 0.293 3.41 0.00 1.000 511.8 520.9 530.1 539.3 548.4 557.5 566.7 42 40.8 0.272 3.16 0.25 0.927 511.9 521.0 530.2 539.4 548.6 557.7 566.9 41 38.6 0.252 2.93 0.48 0.859 512.0 521.1 530.3 539.5 548.7 557.8 567.0 40 36.4 0.233 2.71 0.70 0.795 512.1 521.2 530.4 539.6 548.8 557.9 567.1 39 34.2 0.216 2.51 0.90 0.736 512.2 521.3 530.5 539.7 548.9 558.0 567.2 38 32.0 0.199 2.32 1.09 0.680 512.3 521.4 530.7 539.8 549.0 558.1 567.3 37 29.8 0.184 2.15 .26 0.630 512.4 521.5 530.8 539.9 549.1 558.2 567.4 36 27.6 0.170 1.98 .43 0.581 512.5 521.6 530.9 540.0 549.2 558.3 567.5 35 25.4 0.157 1.82 .59 0.534 512.6 521.7 531.0 540.1 549.3 558.4 567.6 34 23.2 0.145 1.69 .72 0.495 512.7 521.8 531.1 540.2 549.4 558.5 567.7 33 21.0 0.134 1.56 .85 0.458 512.9 522.0 531.2 540.3 549.5 558.6 567.8 44 44 44.0 0.304 3.52 0.00 1.000 510.8 519.9 529.0 538.1 547.3 556.4 565.5 43 41.8 0.282 3.27 0.25 0.929 510.9 520.0 529.1 538.2 547.5 556.5 565.7 42 39.6 0.261 3.02 0.50 0.858 511.0 520.1 529.2 538.3 547.6 556.6 565.8 41 37.4 0.241 2.80 0.72 0.796 511.1 520.2 529.3 538.4 547.7 556.7 565.9 40 35.2 0.223 2.60 0.92 0.739 511.2 520.3 529.4 538.5 547.8 556.8 566.0 39 33.0 0.207 2.40 1.12 0.682 511.3 520.4 529.5 538.6 547.9 556.9 566.1 38 30.8 0.191 2.22 1.30 0.631 511.4 520.5 529.6 538.7 548.0 557.0 566.2 37 28.6 0.177 2.05 1.47 0.582 511.5 520.6 529.7 538.8 548.1 557.1 566.3 36 26.4 0.163 1.89 1.63 0.537 511.6 520.7 529.8 538.9 548.2 557.2 566.4 i 35 24.2 0.151 1.75 1.77 0.497 511.7 520.8 529.9 539.0 548.3 557.3 566.5 84 22.0 0.139 1.62 1.90 0.460 511.7 520.8 530.0 539.1 548.3 557.4 566.6 B 112 PSYCHROMETRICAL TABLES. Reading of Ther- mometer, Fahr. Temp of Dew- Point, Fahr. Force of Vapor in English Inches. We of ^ In a Cubic Foot of Air. ight rapor Reqd. for Sat'n. ofaCu bic Ft of Air. Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. Height of the Barometer in English Inches. Dry. o 45 Wet. in. 28.0 in. 28.5 in. 29.O in. 29.5 in. 3O.O in. 3O.5 in. 31.0 o 45 0 45.0 in. 0.315 gr 3.64 gr- 0.00 1.000 gr- 509.7 gr. 518.8 gr. 527.9 gr- 537.0 gr. 546.1 gr- 555.2 gr. 564.3 44 42.9 0.292 3.39 0.25 0.931 509.8 518.9 528.0 537.1 546.3 555 3 564.5 43 40.8 0.272 3.14 0.50 0.863 509.9 519.0 528.1 537.2 546.4 555.4 564.6 42 38.7 0.253 2.92 0.72 0.802 510.0 519.1 528.2 537.3 546.5 555.5 564.7 41 36.6 0.235 2.70 0.94 0.742 510.1 519.2 528.3 537.4 546.6 555.6 564.8 40 34.5 0.218 2.52 1.12 0.692 510.2 519.3 528.4 537.5 546.7 555.7 564.9 39 32.4 0.202 2.34 1.30 0.643 510.3 519.4 528.5 537.6 546.8 555.8 565.0 38 30.3 0.188 2.16 1.48 0.593 510.4 519.5 528.6 537.7 546.9 555.9 565.1 37 28.2 0.174 2.01 1.63 0.552 510.5 519.6 528.7 537.8 547.0 556.0 565.2 36 26.1 0.161 1.87 1.77 0.514 510.6 519.7 528.8 537.9 547.1 556.1 565.3 35 24.0 0.150 1.73 1.91 0.475 510.7 519.8 528.9 538.0 547.2 556.3 565.4 46 46 46.0 0.326 3.76 0.00 1.000 508.6 517.7 526.7 535.8 544.9 554.0 563.1 45 43.9 0.303 3.50 0.26 0.931 508.7 517.8 526.8 535.9 545.0 554.1 563.2 44 41.8 0.282 3.25 0.51 0.864 508.8 517.9 526.9 536.0 545.1 554.2 563.3 43 39.7 0.262 3.02 0.74 0.803 508.9 518.0 527.0 536.1 545.2 554.3 563.4 42 37.6 0.243 2.90 0.96 0.745 509.0 518.1 527.2 536.3 545.4 554.5 563.6 41 35.5 0.226 2.61 1.15 0.694 509.1 518.2 527.3 536.4 545.5 554.6 563.7 40 33.4 0.210 2.42 1.34 0.643 509.2 518.3 527.4 536.5 545.6 554.7 563.8 39 31.3 0.194 2.24 1.52 0.596 509.3 518.4 527.5 536.6 545.7 554.8 563.9 38 29.2 0.180 2.08 1.68 0.553 509.4 518.5 527.6 536.7 545.8 554.9 564.0 37 27.1 0.167 1.93 1.83 0.514 509.5 518.6 527.7 536.8 545.9 555.0 564.1 36 25.0 0.155 1.79 1.97 0.476 509.5 518.6 527.7 536.8 545.9 555.0 564.1 47 47 47.0 0.337 3.88 0.00 1.000 507.5 516.5 525.6 534.7 543.8 552.8 561.9 46 44.9 0.313 3.62 0.26 0.933 507.6 516.6 525.7 534.8 543.9 552.9 562.0 45 42.8 0.291 3.36 0.52 0.866 507.8 516.7 525.9 535.0 544.1 553.1 562.2 44 40.7 0.271 3.12 0.76 0.804 507.9 516.8 526.0 535.1 544.2 553.2 562.3 43 38.6 0.252 2.90 0.98 0.747 508.0 516.9 526.1 535.2 544.3 553.3 562.4 42 36.5 0.234 2.70 1.18 0.696 508.1 517.0 526.2 535.3 544.4 553.4 562.5 41 34.4 0.217 2.51 1.37 0.647 508.2 517.1 526.3 535.4 544.5 553.5 562.6 40 32.3 0.201 2.32 1.56 0.598 508.3 517.2 526.4 535.5 544.6 553.6 562.7 39 30.2 0.187 2.16 1.72 0.557 508.4 517.3 526.5 535.6 544.7 553.7 562.8 38 28.1 0.173 2.00 1.88 0.515 508.5 517.4 526.6 535.7 544.8 553.8 562.9 37 26.0 0.161 1.85 2.03 0.477 508.5 517.6 526.7 535.8 544.9 554.0 563.1 48 48 48.0 0.349 4.01 0.00 1.000 506.4 515.4 524.5 533.5 542.6 551.6 560.7 47 45.9 0.324 3.73 0.28 0.930 506.5 515.5 524.6 533.7 542.8 551.8 560.9 46 43.8 0.302 3.47 0.54 0.865 506.6 515.6 524.7 533.8 542.9 551.9 561.0 45 41.7 0.281 3.23 0.78 0.805 506.7 515.7 524.8 533.9 543.0 552.0 561.1 44 39.6 0.261 3.00 1.01 0.748 506.8 515.8 524.9 534.0 543.1 552.1 561.2 43 37.5 0.242 2.79 1.22 0.696 506.9 515.9 525.0 534.1 543.2 552.2 561.3 42 35.4 0.225 2.60 1.41 0.648 507.0 516.0 525.1 534.2 543.3 552.3 561.4 41 33.3 0.209 2.40 1.61 0.598 507.1 516.1 525.2 534.4 543.5 552.5 561.5 40 31.2 0.194 2.24 1.77 0.558 507.2 516.2 525.3 534.5 543.5 552.5 561.6 39 29.1 0.180 2.07 1.94 0.516 507.3 516.3 525.4 534*6 543.6 552.6 561.6 38 27.0 0.167 1.92 2.09 0.479 507.4 516.4 525.5 534.7 543.6 552.7 561.7 37 24.9 0.155 1.77 2.24 0.441 507.4 516.4 525.6 534.7 543.7 552.8 561.8 B 113 10 PSYCHROMETRICAL TABLES. Beading of Ther- mometer. Fahr. Temp, of Dew- T>s\ivi + Force of Vapor in Weight of Vapor Hu- midity, Satura- tion = Weight In Grains of a Cubic Foot of Air. In a Cubic iieqa. for Sat'n. Height of the Barometer in English Inches. . omtj Fahr. English Inches. Foot of Air. ofaCu- bic Ft. 1.000. in. in. in. in. in. in. in. Dry. Wet. of Air. 28.0 28.5 29.0 29.5 30.0 30.5 31.0 o o o in. gr. gr. gr- gr. gr. gr- gr. gr- gr. 49 49 49.0 0.361 4.14 0.00 1.000 505.3 514.3 523.3 532.3 541.4 550.4 559.4 48 46.9 0.336 3.85 0.29 0.930 505.4 514.4 523.4 532.4 541.5 550.5 559.5 47 44.8 0.312 3.59 0.55 0.867 505.6 514.6 523.6 532.6 541.7 550.7 559.7 46 42.7 0.290 3.34 0.80 0.807 505.7 514.7 523.7 532.7 541.8 550.8 559.8 45 40.6 0.270 3.10 .04 0.749 505.9 514.9 523.8 532.9 542.0 551.0 560.0 44 38.5 0.251 2.88 .26 0.696 506.0 515.0 523.9 533.0 542.1 551.1 560.1 43 36.4 0.233 2.68 .46 0.647 506.1 515.1 524.0 533.1 542.2 551.2 560.2 42 34.3 0.216 2.49 .65 0.601 506.2 515.2 524.1 533.2 542.3 551.3 560.3 41 32.2 0.201 2.32 .82 0.560 506.3 515.3 524.2 533.3 542.4 551.4 560.4 40 30.1 0.186 2.14 2.00 0.517 506.3 515.3 524.3 533.4 542.5 551.5 560.5 39 28.0 0.173 1.99 2.15 0.481 506.4 515.4 524.4 533.5 542.6 551.6 560.6 38 25.9 0.160 1.84 2.30 0.444 506.4 515.4 524.4 533.5 542.6 551.6 560.6 50 50 50.0 0.373 4.28 0.00 1.000 504.1 513.1 522.1 531.1 540.2 549.2 558.2 49 48.0 0.349 3.99 0.29 0.932 504.2 513.2 522.2 531.2 540.3 549.3 558.3 48 46.0 0.326 3.73 0.55 0.871 504.4 513.4 522.4 531.4 540.5 549.5 558.5 47 44.0 0.304 3.48 0.80 0.813 504.5 513.5 522.5 531.5 540.6 549.6 558.6 46 42.0 0.283 3.25 .03 0.759 504.6 513.6 522.6 531.6 540.7 549.7 558.7 45 40.0 0.264 3.03 .25 0.708 504.8 513.8 522.8 531.8 540.9 549.9 558.9 44 38.0 0.246 2.82 .46 0.659 504.9 513.9 522.9 532.0 541.0 550.0 559.0 43 36.0 0.230 2.63 .65 0.614 505.1 514.1 523.1 532.1 541.2 550.2 559.2 42 34.0 0.214 2.45 .83 0.572 505.2 514.2 523.2 532.2 541.3 550.3 559.3 41 32.0 0.199 2.28 2.00 0.533 505.3 514.3 523.3 532.3 541.4 550.4 559.4 40 30.0 0.186 2.12 2.16 0.495 505.4 514.4 523.4 532.4 541.5 550.5 559.5 39 28.0 0.173 1.97 2.31 0.460 505.5 514.5 523.5 532.5 541.6 550.6 559.6 51 51 51.0 0.386 4.42 0.00 1.000 503.1 512.1 521.1 530.0 539.0 548.0 557.0 50 49.0 0.361 4.12 0.30 0.932 503.2 512.2 521.2 530.1 539.1 548.1 557.1 49 47.0 0.337 3.85 0.57 0.871 503.3 512.3 521.3 530.3 539.3 548.3 557.3 48 45.0 0.315 3.60 0.82 0.814 503.4 512.4 521.4 530.4 539.4 548.4 557.4 47 43.0 0.293 3.36 1.06 0.760 503.5 512.5 521.5 530.5 539.5 548-5 557.5 46 41.0 0.274 3.13 1.29 0.708 503.7 512.7 521.7 530.7 539.7 548.7 557.7 45 39.0 0.255 2.92 1.50 0.661 503.8 512.8 521.8 530.8 539.8 548.8 557.8 44 37.0 0.238 2.72 1.70 0.615 503.9 512.9 521.9 530.9 539.9 548-9 557.9 43 35.0 0.222 2.54 1.88 0.575 504.0 513.0 522.0 531.0 540.0 549.0 558.0 42 33.0 0.207 2.36 2.06 0.534 504.1 513.1 522.1 531.1 540.1 549.1 558.1 41 31.0 0.192 2.20 2.22 0.498 504.2 513.2 522.2 531.2 540.3 549.3 558.3 40 29.0 0.179 2.05 2.37 0.464 504.3 513.3 522.3 531.3 540.4 549.4 558.4 52 52 52.0 0.400 4.56 0.00 1.000 502.1 511.0 520.0 528.9 537.9 5-16.8 555.8 51 50.0 0.373 4.26 0.30 0.934 502.2 511.1 520.1 529.0 538.0 546-9 555.9 50 48.0 0.349 3.98 0.58 0.873 502.4 511.3 520.3 529.2 538.2 547.1 556.1 49 46.0 0.326 3.72 0.84 0.816 502.5 511.4 520.4 529.3 538.3 547.2 556.2 48 44.0 0.304 3.47 1.09 0.761 502.6 511.5 520.5 529.4 538.4 547.3 556.3 47 42.0, 0.283 3.23 1.33 0.709 502.8 511.7 520.7 529.6 538.6 547.5 556.5 46 40.0 0.264 3.02 1.54 0.662 502.9 511.8 520.8 529.7 538.7 547.6 556.6 45 38.0 0.246 2.81 1.75 0.616 502.9 511.9 520.9 529.8 538.8 547.8 556.8 44 36.0 0.230 2.63 1.93 0.577 503.1 512.0 521.0 529.9 539.0 548.0 557.0 43 34.0 0.214 2.44 2.12 0.535 503.2 512.1 521.1 530.0 539.1 548.1 557.1 42 32.0 0.199 2.28 2.28 0.500 503.3 512.3 521.3 530.2 539.2 548.2 557.2 41 30.0 0.186 2.13 2.43 0.467 503.4 512.4 521.4 530.3 539.3 548.3 557.3 B 114 PSYCHROMETRICAL TABLES. 11 Reading of Ther- mometer, Fahr. Temp, of Dew- Point, Fahr. Force of Vapor in English Inches. Weight of Vapor Hu- midity, Satura- tion Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. ivequ. for Sat'n. ofaCu- bic Ft of Air. Height of the Barometer in English Inches. 1.000. in. 28.0 in. 28.5 in. 29.O in. 29.5 in. 30.0 in. 30.5 in. 31.0 Dry. Wet. o o o in. gr- gr. gr- gr. gr- gr. gr. gr. gr. 53 53 53.0 0.414 4.71 0.00 1.000 500.9 509.8 518.8 527.7 536.7 545.6 554.6 52 51.0 0.386 4.40 0.31 0.934 501.1 510.0 519.0 527.9 536.9 545.8 554.8 51 49.0 0.361 4.11 0.60 0.873 501.2 510.1 519.1 528.0 537.0 545.9 554.9 50 47.0 0.337 3.84 0.87 0.815 501.4 510.3 519.3 528.2 537.2 546.1 555.1 49 45.0 0.315 3.58 1.13 0.760 501.5 510.4 519.4 528.3 537.3 546.2 555.2 48 43.0 0.293 3.34 1.37 0.709 501.6 510.5 519.5 528.4 537.4 546.3 555.3 47 41.0 0.274 3.12 1.59 0.662 501.7 510.6 519.6 528.5 537.5 546.4 555.4 46 39.0 0.255 2.91 1.80 0.618 501.8 510.7 519.7 528.6 537.6 546.5 555.5 45 37.0 0.238 2.71 2.00 0.575 502.0 510.9 519.9 528.8 537.8 546.7 555.7 44 35.0 0.222 2.53 2.18 0.537 502.1 511.0 520.0 528.9 537.9 546.8 555.8 43 33.0 0.207 2.35 2.36 0.499 502.1 511.0 520.0 528.9 538.0 546.9 555.9 42 31.0 0.192 2.18 2.53 0.463 502.2 511.1 520.1 529.0 538.1 547.0 556.0 54 54 54.0 0.428 4.86 0.00 1.000 499.9 508.8 517.8 526.7 535.6 544.5 553.5 53 52.0 0.400 4.54 0.32 0-934 500.0 508.9 517.9 526.8 535.7 544.6 553-6 52 50.0 0.373 4.25 0.61 0.875 500.2 509.1 518.1 527.0 535.9 544.8 553.8 51 48.0 0.349 3.96 0.90 0.815 500.3 509.2 518.2 527.1 536.0 544.9 553.9 50 46.0 0.326 3.70 1.16 0.761 500.4 509.3 518.3 527.2 536.1 545.0 554.0 49 44.0 0.304 3.45 1.41 0.709 500.6 509.5 518.5 527.4 536.3 545.2 554.2 48 42.0 0.283 3.23 1.63 0.665 500.7 509.6 518.6 527.5 536.4 545.3 554.3 47 40.0 0.264 3.01 1.85 0.619 500.8 509.7 518.7 527.6 536.5 545.4 554.4 46 38.0 0.246 2.80 2.06 0.576 500.9 509.8 518.8 527.7 536.7 545.6 554.6 45 36.0 0.230 2.61 2.25 0.537 501.0 509.9 518.9 527.8 536.8 545.7 554.7 44 34.0 0.214 2.43 2.43 0.500 501.1 510.0 519.0 527.9 536.9 545.8 554.8 43 32.0 0.199 2.27 2.59 0.467 501.2 510.1 519.1 528.0 537.0 545.9 554.9 42 30.0 0.186 2.10 2.76 0.432 501.3 510.2 519.2 528.1 537.1 546.0 555.0 41 28.0 0.173 1.96 2.90 0.403 501.4 510.3 519.3 528.2 537.2 546.1 555.1 40 26.0 0.161 1.82 3.04 0.375 501.5 510.4 519.4 528.3 537.3 546.2 555.2 55 55 55.0 0.442 5.02 0.00 1.000 498.8 507.7 516.6 525.5 534.4 543.3 552.2 54 53.3 0.418 4.74 0.28 0.944 499.0 507.9 516.8 525.7 534.6 543.5 552.4 53 51.6 0.394 4.46 0.56 0.888 499.1 508.0 516.9 525.8 534.7 543.6 552.5 52 49.9 0.372 4.23 0.79 0.843 499.3 508.2 517.1 526.0 534.9 543.8 552.7 51 48.2 0.351 3.98 1.04 0.793 499.4 508.3 517.2 526.1 535.0 543.9 552.8 50 46.5 0.331 3.76 1.26 0.749 499.5 508.4 517.3 526.2 535.1 544.0 552.9 49 44.8 0.312 3.55 1.47 0.707 499.7 508.6 517.5 526.3 535.3 544.2 553.1 48 43.1 0.295 3.34 1.68 0.665 499.8 508.7 517.6 526.5 535.4 544.3 553.3 47 41.4 0.278 3.14 1.88 0.626 499.8 508.7 517.6 526.6 535.5 544.4 553.4 46 39.7 0.262 2.97 2.05 0.591 499.9 508.8 517.7 526.7 535.6 544-5 553.5 45 38.0 0.246 2.79 2.23 0.556 500.0 508.9 517.9 526.8 535.7 544.6 553.6 44 36.3 0.232 2.64 2.38 0.526 500.1 509.0 518.0 526.9 535.8 544.7 553.7 43 34.6 0.219 2.47 2.55 0.492 500.2 509.1 518.1 527.0 535.9 544.8 553.8 42 32.9 0.206 2.32 2.70 0.462 500.3 509.2 518.2 527.1 536.0 544.9 553.9 41 31.2 0.194 2.20 2.82 0.438 500.4 509.3 518.3 527.1 536.0 544.9 554.0 40 29.5 0.182 2.07 2.95 0.412 500.5 509.3 518.4 527.2 536.1 545.0 554.1 39 27.8 0.172 1.95 3.07 0.388 500.6 509.4 518.5 527.3 536.2 545.1 554.2 38 26.1 0.161 J.83 3.19 0.365 500.7 509.5 518.6 527.4 536.2 545.1 554.2 B 115 12 PSYCHEOMETRICAL TABLES. Reading of Ther- mometer, Fahr. Temp, of Dew- Point, Fahr. Force of Y.p«r English Inches. Weight of Vapor •o--^ Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. xvtjq^u. for Sat'n. ofaCu- bic Ft. of Air. Height of the Barometer in English Inches. in. 28.O in. 28.5 in. 29.0 in. 20.5 in. 30.0 in. 30.5 in. 31.0 Dry. Wet. o 0 o in. gr- gr- gr. gr. gr- gr- gr. gr. gr. 56 56 56.0 0.458 5.18 0.00 1.000 497.7 506.6 515.5 524.4 533.2 542.1 551.0 55 54.3 0.432 4.89 0.29 0.944 497.9 506.8 515.7 524.6 533.4 542.3 551.2 54 52.6 0.408 4.61 0.57 0.890 498.0 506.9 515.8 524.7 533.5 542.4 551.3 53 50.9 0.385 4.37 0.81 0.844 498.2 507.1 516.0 524.9 533.7 542.6 551.5 52 49.2 0.363 4.11 1.07 0.793 498.3 507.2 516.1 525.0 533.8 542.7 551.6 51 47.5 0.343 3.87 1.31 0.747 498.4 507.3 516.2 525.1 533.9 542.8 551.7 50 45.8 0.323 3.66 1.52 0.706 498.6 507.5 516.4 525.3 534.1 543.0 551.9 49 44.1 0.305 3.45 1.73 0.666 498.6 507.5 516.4 525.3 534.2 543.1 552.0 48 42.4 0.287 3.25 1.93 0.627 498.7 507.6 516.5 525.4 534.3 543.2 552.1 47 40.7 0.271 3.07 2.11 0.593 498.8 507.7 516.6 525.5 534.4 543.3 552.2 46 39.0 0.255 2.89 2.29 0.558 498.9 507.8 516.7 525.6 534.5 543.4 552.3 45 37.3 0.240 2.73 2.45 0.527 499.0 507.9 516.8 525.7 534.6 543.5 552.4 44 35.6 0.227 2.56 2.62 0.494 499.1 508.0 516.9 525.8 534.7 543.6 552.5 43 33.9 0.213 2.41 2.77 0.465 499.2 508.1 517.0 525.9 534.8 543.7 552.6 42 32.2 0.201 2.27 2.91 0.438 499.3 508.2 517.1 526.0 534.9 543.8 552.7 41 30.5 0.189 2.14 3.04 0.413 499.4 508.3 517.2 526.1 535.0 543.9 552.8 40 28.8 0.178 2.01 3.17 0.388 499.5 508.4 517.3 526.2 535.1 544.1 552.9 39 27.1 0.167 1.89 3.29 0.365 499.5 508.4 517.3 526.2 535.1 544.1 552.9 57 57 57.0 0.473 5.34 0.00 1.000 496.6 505.5 514.4 523.2 532.1 540.9 549.8 56 55.3 0.447 5.05 0.29 0.946 496.8 505.7 514.6 523.4 532.3 541.1 550.0 55 53.6 0.422 4.76 0.58 0.891 496.9 505.8 514.7 523.5 532.4 541.2 550.1 54 51.9 0.398 4.50 0.84 0.843 497.1 506.0 514.9 523.7 532.6 541.4 550.3 53 50.2 0.376 4.25 1.09 0.796 497.2 506.1 515.0 523.8 532.7 541.5 550.4 52 48.5 0.355 4.00 1.34 0.749 497.3 506.2 515.1 523.9 532.8 541.6 550.5 51 46.8 0.335 3.78 1.56 0.709 497.5 506.4 515.3 524.1 533.0 541.8 550.7 50 45.1 0.316 3.56 1.78 0.667 497.6 506.5 515.4 524.2 533.1 541.9 550.8 49 43.4 0.298 3.36 1.98 0.629 497.7 506.6 .515.5 524.3 533.2 542.0 550.9 48 41.7 0.281 3.17 2.17 0.594 497.8 506.7 515.6 524.4 533.3 542.1 551.0 47 40.0 0.264 2.99 2.35 0.560 497.9 506.8 515.7 524.5 533.4 542.2 551.2 46 38.3 0.249 2.81 2.53 0.526 498.0 506.9 515.8 524.6 533.5 542.3 551.3 45 36.6 0.235 2.65 2.69 0.496 498.1 507.0 515.9 524.7 533.6 542.4 551.4 44 34.9 0.221 2.50 2.84 0.468 498.2 507.1 516.0 524.8 533.7 542.5 551.5 43 33.2 0.208 2.35 2.99 0.440 498.3 507.2 516.1 524.9 533.8 542.6 551.6 42 31.5 0.196 2.21 3.13 0.414 498.3 507.2 516.1 524.9 533.8 542.6 551.6 41 29.8 0.184 2.08 3.26 0.390 498.4 507.3 516.2 525.1 533.9 542.7 551.7 40 28.1 0.173 1.96 3.38 0.367 498.5 507.4 516.3 525.2 534.0 542.8 551.8 B 116 PSYCHROMETRICAL TABLES. 13 Re? of rnor F Dry. o 58 iding L'her- neter, ihr. Wet. Demp. of Dew- Point, Fahr. Force of Vapor in English Inches. Weight of Vapor Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. ivequ. for Sat?n. ofaCu- bic Ft. of Air. gr 0.00 Height of the Barometer in English Inches. in. 28.0 in. 28.5 in. 29.0 in. 29.5 in. 30.0 In. 30.5 in. 31.0 0 58 0 58.0 in. 0.489 gr- 5.51 1.000 gr. 495.5 gr. 504.3 gr. 513.2 gr. 522.0 gr. 530.9 gr. 539.7 gr. 548.6 j 57 56.3 0.462 5.21 0.30 0.946 495.7 504.5 513.4 522.2 531.1 539.9 548.8 56 54.6 0.437 4.92 0.59 0.893 495.8 504.6 513.5 522.3 531.2 540.0 548.9 55 52.9 0.412 4.64 0.87 0.842 496.0 504.8 513.7 522.5 531.4 540.2 549.1 54 51.2 0.389 4.39 1.12 0.797 496.1 504.9 513.8 522.7 531.6 540.4 549.3 53 49.5 0.367 4.14 1.37 0.751 496.2 505.0 513.9 522.8 531.7 540.5 549.4 52 47.8 0.346 3.90 1.61 0.708 496.4 505.2 514.1 523.0 531.9 540.7 549.6 51 46.1 0.327 3.68 1.83 0.668 496.5 505.3 514.2 523.1 532.0 540.8 549.7 50 44.4 0.308 3.48 2.03 0.632 496.6 505.4 514.3 523.2 532.1 540.9 549.8 49 42.7 0.290 3.28 2.23 0.595 496.7 505.5 514.4 523.3 532.2 541.0 549.9 48 41.0 0.274 3.08 2.43 0.559 496.8 505.6 514.5 523.4 532.3 541.1 550.0 47 39.3 0.258 2.91 2.60 0.528 496.9 505.7 514.6 523.5 532.4 541.2 550.1 46 37.6 0.243 2.74 2.77 0.497 497.0 505.8 514.7 523.6 532.5 541.3 550.2 45 35.9 0.229 2.58 2.93 0.469 497.1 505.9 514.8 523.7 532.6 541.4 550.3 44 34.2 0.216 2.43 3.08 0.441 497.2 506.0 514.9 523.8 532.7 541.5 550.4 43 32.5 0.203 2.29 3.22 0.416 497.3 506.1 515.1 523.9 532.8 541.6 550.5 42 30.8 0.191 2.15 3.36 0.390 497.4 506.2 515.2 524.1 532.9 541.7 550.6 41 29.1 0.180 2.03 3.48 0.368 497.5 506.3 515.3 524.2 533.0 541.8 550.7 40 27.4 0.169 1.91 3.60 0.347 497.5 506.3 515.3 524.2 533.0 541.8 550.7 59 59 59.0 0.506 5.69 0.00 1.000 494.5 503.3 512.2 521.0 529.8 538.6 547.5 58 57.3 0.478 5.37 0.32 0.944 494.6 503.4 512.3 521.1 529.9 538.7 547.6 57 55.6 0.452 5.08 0.61 0.893 494.7 503.5 512.4 521.2 530.0 538.8 547.7 56 53.9 0.426 4.79 0.90 0.842 494.8 503.6 512.5 521.3 530.1 538.9 547.8 55 52.2 0.402 4.53 1.16 0.796 494.9 503.7 512.6 521.4 530.3 539.1 548.0 54 50.5 0.380 4.28 1.41 0.752 495.1 503.9 512.8 521.6 530.5 539.3 548.2 53 48.8 0.358 4.03 1.66 0.708 495.3 504.1 513.0 521.8 530.7 539.5 548.4 52 47.1 0.338 3.80 1.89 0.668 495.4 504.2 513.1 521.9 530.8 539.6 548.5 51 45.4 0.319 3.60 2.09 0.633 495.5 504.3 513.2 522.0 530.9 539.7 548.6 50 43.7 0.301 3.39 2.30 0.596 495.7 504.5 513.4 522.2 531.1 539.9 548.8 49 42.0 0.283 3.19 2.50 0.561 495.8 504.6 513.4 522.3 531.2 540.0 548.9 48 40.3 0.267 3.01 2.68 0.529 495.9 504.7 513.5 522.4 531.3 540.1 549.0 47 38.6 0.252 2.84 2.85 0.499 496.0 504.8 513.6 522.5 531.4 540.2 549.1 46 36.9 0.237 2.67 3.02 0.469 496.1 504.9 513.7 522.6 531.5 540.3 549.2 45 35.2 0.223 2.51 3.18 0.441 496.2 505.0 513.8 522.7 531.6 540.4 549.3 44 33.5 0.210 2.37 3.32 0.417 496.3 505.1 513.9 522.8 531.7 540.5 549.4 43 31.8 0.198 2.23 3.46 0.392 496.4 505.2 514.1 522.9 531.8 540.6 549.5 42 30.1 0.186 2.09 3.60 0.367 496.5 505.3 514.2 523.0 531.9 540.7 549.6 41 * 28.4 0.175 1.97 3.72 0.346 496.6 505.4 514.3 523.1 532.0 540.8 549.7 40 26.7 0.165 1.85 3.84 0.325 496.6 505.4 514.3 523.1 532.0 540.8 549.7 ! B 117 14 PSYCHROMETRICAL TABLES. Reading of Ther- mometer. Fahr. Temp of Dew- Point, Fahr. Force of Vapor in English Inches. Weight of Vapor Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. In a Cubic Footo Air. Reqd. for Sat'n. ofaCu bic Ft of Air Height of the Barometer in English Inches. in. 28.0 in. 28.5 in. 29.O in. 29.5 in. 30.0 in. 30.5 in. 31.0 Dry. Wet. 0 o 0 in. gr- gr- gr. gr. gr- gr. gr. gr- gr. 60 60 60.0 0.523 5.87 0.00 1.000 493.4 502.2 511.0 519.8 528.6 537.4 546.2 59 58.3 0.494 5.54 0.33 0.944 493.6 502.4 511.2 520.0 528.8 537-6 546.4 58 56.6 0.467 5.24 0.63 0.893 493.7 502.5 511.3 520.1 528.9 537.7 546.5 57 54.9 0.441 4.95 0.92 0.843 493.8 502.6 511.4 520.2 529.0 537.8 546.6 56 53.2 0.416 4.68 1.19 0.797 494.0 502.8 511.6 520.4 529.2 538.0 546.8 55 51.5 0.393 4.41 1.46 0.751 494.2 503.0 511.8 520.6 529.4 538.2 547.0 54 49.8 0.371 4.17 1.70 0.710 494.4 503.2 512.0 520.8 529.6 538.4 547.2 53 48.1 0.350 3.92 1.95 0.668 494.5 503.3 512.1 520.9 529.7 538.5 547.4 52 46.4 0.330 3.70 2.17 0.630 494.7 503.4 512.3 521.1 529.9 538.7 547.6 51 44.7 0.311 3.49 2.38 0.595 494.8 503.5 512.4 521.2 530.0 538.8 547.7 50 43.0 0.293 3.29 2.58 0.561 494.8 503.6 512.5 521.3 530.1 538.9 547.8 49 41.3 0.277 3.10 2.77 0.528 494.9 503.7 512.6 521.4 530.2 539.0 547.9 48 39.6 0.261 2.93 2.94 0.499 495.0 503.8 512.7 521.5 530.3 539.1 548.0 47 37.9 0.246 2.75 3.12 0.468 495.1 503.9 512.8 521.6 530.4 539.2 548.1 46 36.2 0.231 2.60 3.27 0.443 495.2 504.0 512.9 521.7 530.5 539.3 548.2 45 34.5 0.218 2.45 3.42 0.417 495.3 504.1 513.0 521.8 530.6 539.4 548.3 44 32.8 0.205 2.31 3.56 0.394 495.4 504.2 513.1 521.9 530.7 539.5 548.4 43 31.1 0.193 2.17 3.70 0.370 495.5 504.3 513.2 522.0 530.8 539.6 548.5 42 29.4 0.182 2.04 3.83 0.348 495.6 504.4 513.3 522.1 530.9 539.7 548.6 41 27.7 0.171 1.92 3.95 0.327 495.6 504.4 513.3 522.1 530.9 539.7 548.7 61 61 61.0 0.541 6.06 0.00 1.000 492.3 501.1 509.9 518.7 527.5 536.3 545.1 60 59.3 0.511 5.72 0.34 0.944 492.5 501.3 510.1 518.9 527.7 536.5 545.3 59 57.6 0.483 5.40 0.66 0.891 492.6 501.4 510.2 519.0 527.8 536.6 545.4 58 55.9 0.456 5.11 0.95 0.843 492.8 501.6 510.4 519.2 528.0 536.8 545.6 57 54.2 0.431 4.83 1.23 0.797 493.0 501.8 510.6 519.4 528.2 537.0 545.8 56 52.5 0.407 4.55 1.51 0.751 493.1 501.9 510.7 519.5 528.3 537.1 545.9 55 50.8 0.383 4.30 1.76 0.710 493.3 502.1 510.9 519.7 528.5 537.3 546.1 54 49.1 0.362 4.05 2.01 0.668 493.4 502.2 511.0 519.8 528.6 537.4 546.2 53 47.4 0.342 3.83 2.23 0.632 493.5 502.3 511.1 519.9 528.7 537.5 546.3 52 45.7 0.322 3.61 2.45 0.596 493.6 502.4 511.2 520.0 528.8 537.6 546.4 51 44.0 0.304 3.40 2.66 0.561 493.8 502.6 511.4 520.2 529.0 537.8 546.6 50 42.3 0.286 3.21 2.85 0.530 493.9 502.7 511.5 520.3 529.1 537.9 546.7 49 40.6 0.270 3.02 3.04 0.498 494.0 502.8 511.6 520.4 529.2 538.0 546.8 48 38.9 0.254 2.85 3.21 0.470 494.1 502.9 511.7 520.5 529.3 538.1 546.9 47 37.2 0.240 2.69 3.37 0.444 494.2 503.0 511.8 520.6 529.4 538.2 547.0 46 35.5 0.226 2.53 3.53 0.417 494.3 503.1 511.9 520.7 529.5 538.3 547.1 45 33.8 0.213 2.38 3.68 0.393 494.4 503.2 512.0 520.8 529.6 538.4 547.2 44 32.1 0.200 2.24 3.82 0.370 494.5 503.3 512.1 520.9 529.7 538.5 547.3 43 30.4 0.188 2.11 3.95 0.348 494.6 503.4 512.2 521.0 529.8 538.6 547.4 42 28.7 0.177 1.99 4.07 0.328 494.7 503.5 512.3 521.1 529.9 538.7 547.5 41 27.0 0.167 1.87 4.19 0.309 494.7 503.5 512.3 521.1 529.9 538.7 547.5 B 118 PSYCHROMETRICAL TABLES. 15 Reading of Ther- mometer, Fahr. Temp, of Dew- Point, Fahr. Force of Vapor in English Inches. Weight of Vapor. Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. j In a Cubic Foot of Air. Reqd. for Sat'n. ofaCu- bic Ft. of Air. Height of the Barometer in English Inches. in. 28.0 in. 28.5 in. 29.0 in. 29.5 in. 30.0 in. 30.5 in. 31.O Dry. Wet. 0 o o in. gr- gr. gr- gr. gr. gr. &• gr. gr. 62 62 62.0 0.559 6.25 0.00 1.000 491.2 499.9 508.7 517.5 526.3 535.1 543.9 61 60.3 0.528 5.91 0.34 0.946 491.4 500.1 508.9 517.7 526.5 535.3 544.1 60 58.6 0.499 5.58 0.67 0.893 491.5 500.2 509.0 517.8 526.6 535.4 544.2 59 56.9 0.472 5.27 0.98 0.843 491.7 500.4 509.2 518.0 526.8 535.6 544.4 58 55.2 0.445 4.99 1.26 0.798 491.9 500.6 509.4 518.2 527.0 535.8 544.6 57 53.5 0.421 4.70 1.55 0.752 492.0 500.7 509.5 518.3 527.1 535.9 544.7 56 51.8 0.397 4.44 1.81 0.710 492.1 500.7 509.5 518.4 527.3 536.1 544.9 55 50.1 0.375 4.19 2.06 0.670 492.2 500.9 509.7 518.5 527.4 536.2 545.0 54 48*4 0.354 3.95 2.30 0.632 492.4 501.1 509.9 518.7 527.6 536.4 545.2 53 46.7 0.333 3.72 2.53 0.595 492.5 501.3 510.1 518.9 527.7 536.5 545.3 52 45.0 0.315 3.52 2.73 0.563 492.7 501.5 510.3 519.1 527.9 536.7 545.5 51 43.3 0.297 3.31 2.94 0.530 492.8 501.6 510.4 519.2 528.0 536.8 545.6 50 41.6 0.280 3.13 3.12 0.501 492.9 501.7 510.5 519.3 528.1 536.9 545.7 49 39.9 0.263 2.95 3.30 0.472 493.0 501.8 510.6 519.4 528.2 537.0 545.8 48 38.2 0.248 2.77 3.48 0.443 493.1 501.9 510.7 519.5 528.3 537.1 545.9 47 36.5 0.234 2.61 3.64 0.418 493.2 502.0 510.8 519.6 528.4 537.2 546.0 46 34.8 0.220 2.47 3.78 0.395 493.3 502.1 510.9 519.7 528.5 537.3 546.1 ; 45 33.1 0.207 2.32 3.93 0.371 493.3 502.1 511.0 519.7 528.6 537.3 546.1 44 31.4 0.195 2.18 4.07 0.349 493.4 502.2 511.0 519.8 528.6 537.4 546.2 43 29.7 0.184 2.06 4.19 0.330 493.4 502.2 511.1 519.8 528.6 537.4 546.2 42 28.0 0.173 1.94 4.31 0.311 493.5 502.3 511.2 519.9 528.7 537.5 546.3 41 26.3 0.163 1.83 4.42 0.293 493.6 502.4 511.3 520.0 528.8 537.6 546.4 63 63 63.0 0.578 6.45 0.00 1.000 490.2 498.9 507.7 516.4 525.2 533.9 542.7 62 61.3 0.546 6.10 0.35 0.946 490.4 499.1 507.9 516.6 525.4 534.1 542.9 61 59.6 0.516 5.76 0.69 0.893 490.5 499.2 508.0 516.7 525.5 534.2 543.0 *60 57.9 0.488 5.44 1.01 0.843 490.7 499.4 508.2 516.9 525.7 534.4 543.2 59 56.2 0.461 5.15 1.30 0.798, 490.9 499.6 508.4 517.1 525.9 534.6 543.4 58 54.5 0.435 4.86 1.59 0.753 491.0 499.7 508.5 517.2 526.0 534.7 543.5 57 52.8 0.411 4.59 1.86 0.712 491.1 499.8 508.6 517.3 526.2 534.9 543.7 56 51.1 0.388 4.33 2.12 0.671 491.2 499.9 508.7 517.4 526.3 535.0 543.8 55 49.4 0.366 4.09 2.36 0.634 491.3 500.0 508.8 517.5 526.4 535.1 543.9 54 47.7 0.345 3.85 2.60 0.597 491.5 500.2 509.0 517-.7 526.6 535.3 544.1 53 46.0 0.326 3.63 2.82 0.563 491.7 500.4 509.2 518.0 526.8 535.5 544.3 52 44.3 0.307 3.43 3.02 0.532 491.8 500.5 509.3 518.1 526.9 535.6 544.4 51 42.6 0.289 3.24 3.21 0.502 491.9 500.6 509.4 518.2 527.0 535.7 544.5 50 40.9 0.273 3.05 3.40 0.473 492.0 500.7 509.5 518.3 527.1 535.8 544.6 49 39.2 0.257 2.07 3.58 0.445 492.1 500.8 509.6 518.4 527.2 535.9 544.7 48 37.5 0.242 2.71 3.74 0.420 492.2 500.9 509.7 518.5 527.3 536.0 544.8 47 35.8 0.228 2.56 3.89 0.397 492.3 501.0 509.8 518.6 527.4 536.1 544.9 46 34.1 0.215 2.41 4.04 0.374 492.4 501.1 509.9 518.7 527.5 536.2 545.0 45 32.4 0.202 2.26 4.19 0.351 492.5 501.2 510.0 518.8 527.6 536.3 545.1 44 30.7 0.190 2.13 4.32 0.330 492.5 501.2 510.0 518.8 527.6 536.3 545.1 43 29.0 0.179 2.00 4.45 0.310 492.6 501.3 510.1 518.9 527.7 536.4 545.2 42 27.3 1 0.168 1.87 4.58 0.290 492.7 501.4 510.2 519.0 527.8 536.5 545.3 B 119 16 PSYCHROMETRICAL TABLES. Reading of Ther- mometer, Fahr. Temp, of Dew- Point, Fahr. Force of Vapor in English Inches. Weight of Vapor. Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. Reqd. for Sat'n. ofaCu- bic Ft. of Air. Height of the Barometer in English Inches. Dry. Wet. in. 28.0 in. 28.5 in. 29.0 in. 29.5 30.0 in. 30.5 in. 31.0 o 0 o in. gr. gr. gr. gr. gr- gr- gr. gr. gr. 64 64 64.0 0.597 6.65 0.00 1.000 489.1 497.8 506.6 515.3 524.0 532.7 541.5 63 62.3 0.565 6.29 0.36 0.946 489.3 498.0 506.8 515.5 524.2 532.9 541.7 62 60.6 0.534 5.94 0.71 0.893 489.5 498.2 507.0 515.7 524.4 533.1 541.9 61 58.9 0.504 5.61 1.04 0.843 489.7 498.4 507.2 515.9 524.6 533.3 542.1 60 57.2 0.476 5.31 1.34 0.798 489.9 498.6 507.4 516.1 524.8 533.5 542.3 59 55.5 0.450 5.01 1.64 0.753 490.0 498.7 507.5 516.2 524.9 533.6 542.4 58 53.8 0.425 4.73 1.92 0.711 490.1 498.8 507.6 516.3 525.1 533.8 542.6 57 52.1 0.401 4.47 2.18 0.672 490.2 498.9 507.7 516.4 525.2 533.9 542.7 56 50.4 0.379 4.23 2.42 0.636 490.4 499.1 507.9 516.6 525.4. 534.1 542.9 55 48.7 0.357 3.98 2.67 0.598 490.5 499.2 508.0 516.7 525.5 534.2 543.0 54 47.0 0.337 3.75 2.90 0.564 490.7 499.4 508.2 516,9 525.7 534.4 543.2 53 45.3 0.318 3.55 3.10 0.534 490.8 499.5 508.3 517.0 525.8 534.5 543.3 52 43.6 0.300 3.34 3.31 0.502 490.9 499.6 508.4 517.1 525.9 534.6 543.4 51 41.9 0.282 3.15 3.50 0.473 491.0 499.7 508.5 517.2 526.0 534.7 543.5 50 40.2 0.266 2.96 3.69 0.445 491.2 499.9 508.7 517.4 526.1 534.9 543.7 49 38.5 0.251 2.79 3.86 0.419 491.3 500.0 508.8 517.5 526.2 535.0 543.8 48 36.8 0.236 2.63 4.02 0.396 491.4 500.1 508.9 517.6 526.3 535.1 543.9 47 35.1 0.223 2.47 4.18 0.372 491.5 500.2 509.0 517.7 526.4 535.2 544.0 46 33.4 0.210 2.33 4.32 0.351 491.6 500.3 509.1 517.8 526.5 535.3 544.1 45 31.7 0.197 2.19 4.46 0.330 491.7 500.4 509.2 517.9 526.6 535.4 544.2 44 30.0 0.186 2.06 4.59 0.310 491.7 500.4 509.2 517.9 526.6 535.4 544.2 43 28.3 0.175 1.94 4.71 0.292 491.8 500.5 509.3 518.0 526.7 535.5 544.3 42 26.6 0.164 1.83 4.82 0.275 491.9 500.6 509.4 518.1 526.8 535.6 544.4 65 65 65.0 0.617 6.87 0.00 1.000 488.1 496.8 505.5 514.2 522.9 531.6 540.3 64 63.4 0.586 6.51 0.36 0.947 488.3 497.0 505.7 514.4 523.1 531.8 540.5 63 61.8 0.555 6.17 0.70 0.898 488.5 497.2 505.9 514.6 523.3 532.0 540.7 62 60.2 0.527 5.85 1.02 0.851 488.7 497.4 506.1 514.8 523.5 532.2 5.40.9 61 58.6 0.499 5.55 1.32 0.808 488.9 497.6 506.3 515.0 523.7 532.4 541.1 60 57.0 0.473 5.25 1.62 0.765 489.0 497.7 506.5 515.2 523.9 532.6 541.3 59 55.4 0.449 4.98 1.89 0.725 489.1 497.8 506.6 515.3 524.0 532.7 541.5 58 53.8 0.425 4.72 2.15 0.687 489.3 498.0 506.8 515.5 524.2 532.9 541.7 57 52.2 0.402 4.47 2.40 0.651 489.4 498.1 506.9 515.6 524.3 533.0 541.8 56 50.6 0.381 4.23 2.64 0.616 489.6 498.3 507.1 515.8 524.5 533.2 542.0 55 49.0 0.361 4.01 2.86 0.584 489.7 498.4 507.2 515.9 524.6 533.3 542.1 54 47.4 0.342 3.79 3.08 0.552 489.8 498.5 507.3 516.0 524.7 533.4 542.2 53 45.8 0.323 3.60 3.27 0.524 489.9 498.6 507.4 516.1 524.8 533.5 542.3 52 44.2 0.306 3.39 3.48 0.493 490.0 498.7 507.5 516.2 524.9 533.6 542.4 51 42.6 0.289 3.22 3.65 0.469 490.1 498.8 507.6 516.3 525.0 533.7 542.5 50 41.0 0.274 3.04 3.83 0.442 490.2 498.9 507.7 516.4 525.1 533.8 542.6 49 39.4 0.259 2.87 4.00 0.418 490.3 499.0 507.8 516.5 525.2 533.9 542.7 48 37.8 0.245 2.72 .15 0.396 490.3 499.0 507.8 516.5 525.2 533.9 542.7 47 36.2 0.231 2.57 .30 0.374 490.4 499.1 507.9 516.6 525.3 534.0 542.8 46 34.6 0.219 2.43 .44 0.354 490.5 499.2 508.0 516.7 525.4 534.1 542.9 45 33.0 0.207 2.31 .56 0.336 490.6 499.3 508.1 516.8 525.5 534.2 543.0 44 31.4 0.195 2.17 .70 0.316 490.7 499.4 508.2 516.9 525.6 534.3 513.1 43 29.8 0.184 2.05 4.82 0.299 490.7 499.4 508.2 516.9 525.6 534.3 543.1 42 23.2 0.174 1.94 4.93 0.283 490.8 499.5 508.3 517.0 525.7 534.4 543.2 B 120 PSYCHROMETRICAL TABLES. 17 Reading of Ther- mometer, Fahr. Temp, of Dew- Point, Fahr. Force of Vapor in English Inches. We of V In a Cubic Foot of Air. ght apor "Reqd. for Sat'n. ofaCu- bic Ft. of Air. Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. Height of the Barometer in English Inches. in. 28.0 in. 28.5 in. 29.0 in. 29.5 in. 30.0 in. 30.5 in. 31.0 Dry. 0 66 Wet. o 66 o 66.0 in. 0.638 gr. 7.08 gr. 0.00 1.000 gr. 487.0 gr. 495.7 gr. 504.4 gr. 513.1 gr. 521.8 gr. 530.5 gr. 539.2 65 64.4 0.605 6.72 0.36 0.949 487.2 495.9 504.6 513.3 522.0 530.7 539.4 64 62.8 0.574 6.35 0.73 0.897 487.3 496.0 504.7 513.4 522.1 530.8 539.5 63 61.2 0.544 6.04 1.04 0.853 487.5 496.2 504.9 513.6 522.3 531.0 539.7 62 59.6 0.516 5.72 1.36 0.808 487.7 496.4 505.1 513.8 522.5 531.2 539.9 61 58.0 0.489 5.42 1.66 0.766 487.9 496.6 505.3 514.0 522.7 531.4 540.1 60 56.4 0.464 5.14 1.94 0.726 488.0 496.7 505.4 514.1 522.8 531.5 540.2 59 54.8 0.440 4.88 2.20 0.689 488.1 496.8 505.5 514.2 523.0 531.7 540.4 58 53.2 0.416 4.62 2.46 0.652 488.2 496.9 505.6 514.3 523.1 531.8 540.5 57 51.6 0.394 4.37 2.71 0.619 488.4 497.1 505.8 514.5 523.3 532.0 540.7 56 50.0 0.373 4.15 2.93 0.586 488.5 497.2 505.9 514.6 523.4 532.1 540.8 55 48.4 0.354 3.92 3.16 0.553 488.6 497.3 506.1 514.8 523.5 532.2 541.0 54 46.8 0.335 3.72 3.36 0.525 488.8 497.5 506.3 515.0 523.7 532.4 '541.2 53 45.2 0.317 3.51 3.57 0.496 488.9 497.6 506.4 515.1 523.8 532.5 541.3 52 43.6 0.300 3.33 3.75 0.470 489.0 497.7 506.5 515.2 523.9 532.6 541.4 51 42.0 0.283 3.14 3.94 0.443 489.1 497.8 506.6 515.3 524.0 532.7 541.5 50 40.4 0.268 2.97 4.11 0.419 489.2 497.9 506.7 515.4 524.1 532.8 541.6 49 38.8 0.253 2.81 4.27 0.397 489.3 498.0 506.8 515.5 524.2 532.9 541.7 48 37.2 0.240 2.66 4.42 0.376 489.4 498.1 506.9 515.6 524.3 533.0 541.8 47 35.6 0.227 2.51 4.57 0.355 489.4 498.1 506.9 515.6 524.3 533.0 541.8 46 34.0 0.214 2.37 4.71 0.335 489.5 498.2 507.0 515.7 524.4 533.1 541.9 45 32.4 0.202 2.24 4.84 0.316 489.6 498.3 507.1 515.8 524.5 533.2 542.0 44 30.8 0.191 2.12 4.96 0.299 489.7 498.4 507.2 515.9 524.6 533.3 542.1 43 29.2 0.180 2.00 5.08 0.283 489.7 498.4 507.2 515.9 524.6 533.3 542.1 67 67 67.0 0.659 7.30 0.00 1.000 485.9 494.6 503.3 512.0 520.6 529.3 538.0 66 65.4 0.626 6.93 0.37 0.949 486.1 494.8 503.5 512.2 520.8 529.5 538.2 65 63.8 0.593 6.55 0.75 0.897 4S6.3 495.0 503.7 512.4 521.0 529.7 538.4 64 62.2 0.563 6.23 1.07 0.853 486.5 495.2 503.9 512.6 521.2 529.9 538.6 63 60.6 0.534 5.91 1.39 0.810 486.7 495.4 504.1 512.8 521.4 530.1 538.8 62 59.0 0.506 5-60 1.70 0.767 486.8 495.5 504.2 512.9 521.6 530.3 539.0 61 57.4 0.480 5.31 1.99 0.728 486.9 495.6 504.3 513.0 521.7 530.4 539.1 60 55.8 0.455 5.04 2.26 0.691 487.1 495.8 504.5 513.2 521.9 530.6 539.3 59 54.2 0.431 •4.77 2.53 0.653 487.2 495.9 504.6 513.3 522.0 530.7 539.4 58 52.6 0.408 4.52 2.78 0.619 487.3 496.0 504.7 513.4 522.1 530.8 539.5 57 51.0 0.386 4.28 3.02 0.586 487.5 496.2 504.9 513.6 522.3 531.0 539.7 56 49.4 0.366 4.05 3.25 0.555 487.6 496.3 505.0 513.7 522.4 531.1 539.8 55 47.8 0.346 3.83 3.47 0.524 487.8 496.5 505.1 513.8 522.6 531.2 549.9 54 46.2 0.328 3.62 3.68 0.496 487.9 496.6 505.2 513.9 522.7 531.3 540.0 53 44.6 0.310 3.43 3.87 0.470 488.0 496.7 505.3 514.0 522.8 531.4 540-1 52 43.0 0.293 3.25 4.05 0.445 488.1 496.8 504.4 514.1 522.9 531.5 540.2 51 41.4 0.278 3.08 4.22 0.422 488.2 496.9 505.5 514.2 523.0 531.6 540.3 50 39.8 0.263 2.91 4.39 0.399 488.4 497.1 505.7 514.4 523.1 531.8 540.5 49 38.2 0.248 2.75 4.55 0.377 488.5 497.2 505.8 514.5 523.2 531.9 540.6 B 121 18 PSYCHROMETRICAL TABLES. Reading of Ther- mometer, Fahr. Temp, of Dew- Point, Fahr. Force of Vapor in English Inches. Weight of Vapor Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. iwjqu. for Sat'n. ofaCu- bic Ft. of Air. Height of the Barometer in English Inches. in. 28.0 in. 28.5 in. 29.0 in. 29.5 in. 30.0 in. 30.5 in. 31.0 Dry. Wet. o o o in. gr. gr. gr. gr- gr. gr. gr. gr- gr- 67 49 38.2 0.248 2.75 4.55 0.377 488.5 497.2 505.8 514.5 523.2 531.9 540.6 48 36.6 0.235 2.60 4.70 0.356 488.6 497.3 505.9 514.6 523.3 532.0 540.7 47 35.0 0.222 2.46 4.84 0.337 488.7 497.4 505.9 514.7 523.4 532.1 540.8 46 33.4 0.210 2.32 4.98 0.318 488.7 497.4 506.0 514.7 523.4 532.1 540.8 45 31.8 0.198 2.19 5.11 0.301 488.8 497.5 506.1 514.8 523.5 532.2 540.9 44 30.2 0.187 2.07 5.23 0.284 488.9 497.6 506.2 514.9 523.6 532.3 541.0 68 68 68.0 0.681 7.53 0.00 1.000 484.9 493.5 502.2 510.8 519.5 528.1 536.8 67 66.4 0.646 7.15 0.38 0.949 485.1 493.8 502.5 511.1 519.7 528.4 537.1 66 64.8 0.613 6.77 0.76 0.899 485.3 494.0 502.6 511.2 519.9 528.6 537.3 65 63.2 0.582 6.43 1.10 0.854 485.5 494.2 502.8 511.4 520.1 528.8 537.5 64 61.6 0.552 6.10 1.43 0.810 485.7 494.4 503.0 511.6 520.3 529.0 537.7 63 60.0 0.523 5.78 1.75 0.768 485.8 494.5 503.1 511.8 520.5 529.2 537.9 62 58.4 0.496 5.47 2.06 0.726 485.9 494.6 503.3 512.0 520.7 529.4 538.1 61 56.8 0.470 5.20 2.33 0.691 486.0 494.7 503.4 512.1 520.8 529.5 538.3 60 55.2 0.445 4.93 2.60 0.655 486.2 494.9 503.6 512.3 521.0 529.7 538.5 59 53.6 0.422 4.67 2.86 0.620 486.3 495.0 503.7 512.4 521.1 529.8 538.6 58 52.0 0.400 4.42 3.11 0.587 486.4 495.1 503.8 512.5 521.2 529.9 538.6 57 50.4 0.379 4.19 3.34 0.556 486.6 495.3 504.0 512.7 521.4 530.1 538.8 56 48.8 0.358 3.96 3.57 0.526 486.7 495.4 504.1 512.8 521.5 530.2 538.9 55 47.2 0.339 3.75 3.78 0.498 486.8 495.5 504.2 512.9 521.6 530.3 539.0 54 45.6 0.321 3.54 3.99 0.470 486.9 495.6 504.3 513.0 521.7 530.4 539.1 53 44.0 0.304 3.35 4.18 0.445 487.0 495.7 504.4 513.1 521.8 530.5 539.2 52 42.4 0.287 3.17 4.36 0.421 487.1 495o8 504.5 513.2 521.9 530.6 539.3 51 40.8 0.272 3.00 4.53 0.399 487.2 495.9 504.6 513.3 522.0 530.7 539.4 50 39.2 0.257 2.84 4.69 0.377 487.3 496.0 504.7 513.4 522.1 530.8 539.5 49 37.6 0.243 2.68 4.85 0.356 487.4 496.1 504.8 513.5 522.2 530.9 539.6 48 36.0 0.230 2.54 4.99 0.337 487.5 496.2 504.9 513.6 522.3 531.0 539.7 47 34.4 0.217 2.40 5.13 0.319 487.6 496.3 505.0 513.7 522.4 531.1 539.8 46 32.8 0.205 2.27 5.26 0.302 487.6 496.3 505.0 513.7 522.4 531.1 539.8 45 31.2 0.194 2.15 5.38 0.286 487.7 496.4 505.1 513.8 522.5 531.2 539.9 44 29.6 0.183 2.04 5.49 0.271 487.8 496.5 505.2 513.9 522.6 531.3 540.0 69 69 69.0 0.704 7.76 0.00 1.000 483.8 492.4 501.1 509.7 518.3 527.0 535.6 68 67.4 0.668 7.37 0.39 0.950 484.0 492.6 501.3 509.9 518.5 527.2 535.8 67 65.8 0.634 7.00 0.76 0.902 484.2 492.8 501.5 510.1 518.7 527.4 536.0 66 64.2 0.601 6.63 1.13 0.854 484.4 493.0 501.7 510.3 518.9 527.6 536.2 65 62.6 0.570 6.29 1.47 0.810 484.6 493.2 501.9 510.5 519.1 527.8 536.4 64 61.0 0.541 5.97 1.79 0.769 484.8 493.4 502.1 510.7 519.3 528.0 536.6 63 59.4 0.513 5.65 2.11 0.728 485.0 493.6 502.3 510.9 519.5 528.2 536.8 62 57.8 0.486 5.37 2.39 0.693 485.1 493.7 502.4 511.0 519.6 528.3 536.9 61 56.2 0.461 5.09 2.67 0.657 485.1 493.7 502.6 511.2 519.8 528.5 537.1 60 54.6 0.437 4.82 2.94 0.621 485.2 493.9 502.7 511.3 519.9 528.6 537.3 59 53.0 0.414 4.57 3.19 0.589 485.4 494.1 502.8 511.5 520.1 528.8 537.5 58 51.4 0.392 4.33 3.43 0.558 485.5 494.2 502.9 511.6 520.2 528.9 537.6 B 122 PSYCHROMETRICAL TABLES. 19 Reading of Ther- mometer, Fakr. Temp, of Dew- Point, Fahr. Force of Vapor in English Inches. Weight of Vapor Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. xwsqu. for Sat'n. ofaCu- bic Ft. of Air. Height of the Barometer in English Inches. Dry. Wet. in. 28.0 in. 28.5 gr. 494.2 in. 29.0 in. 29.5 in. 30.0 in. 30.5 in. 31.O 0 69 0 58 o 51.4 in. 0.392 gr. 4.33 gr. 3.43 0.558 gr. 485.5 gr- 502.9 gr. 511.6 gr. 520.2 gr- 528.9 gr- 537.6 57 49.8 0.371 4.09 3.67 0.527 485.7 494.4 503.1 511.8 520.4 529.1 537.8 56 48.2 0.351 3.87 3.89 0.499 485.8 494.5 503.2 511.9 520.5 529.2 537.9 55 46.6 0.332 3.66 4.10 0.472 485.9 494.6 503.3 512.0 520.6 529.3 538.0 54 45.0 0.315 3.47 4.29 0.447 486.0 494.7 503.4 512.1 520.7 529.4 538.1 53 43.4 0.298 3.29 4.47 0.424 486.1 494.8 503.5 512.2 520.8 529.5 538.2 52 41.8 0.282 3.11 4.65 0.401 486.2 494.9 503.6 512.3 520.9 529.6 538.3 51 40.2 0.266 2.94 4.82 0.379 486.3 495.0 503.7 512.4 521.0 529.7 538.4 50 38.6 0.252 2.78 4.98 0.358 486.4 495.1 503.8 512.5 521.1 529.8 538.5 49 37.0 0.238 2.63 5.13 0.339 486.5 495.2 503.9 512.6 521.2 529.9 538.6 48 35.4 0.225 2.49 5.27 0.321 486.6 495.3 504.0 512.7 521.3 530.0 538.7 47 33.8 0.213 2.34 5.42 0.302 486.7 495.4 504.1 512.8 521.4 530.1 538.8 46 32.2 0.201 2.20 5.56 0.284 486.8 495.5 504.2 512.9 521.5 530.2 538.9 45 30.6 0.190 2.06 5.70 0.266 486.8 495.5 504.2 512.9 521.5 530.2 538.9 70 70 70.0 0.727 8.00 0.00 1.000 482.8 491.4 500.0 508.6 517.2 525.8 534.4 69 68.5 0.692 7.62 0.38 0.953 483.0 491.6 500.2 508.8 517.4 526.0 534.6 68 67.0 0.659 7.26 0.74 0.907 483.2 491.8 500.4 509.0 517.6 526.2 534.8 67 65.5 0.628 6.91 1.09 0.865 483.3 491.9 500.5 509.1 517.7 526.3 534.9 66 64.0 0.597 6.57 1.43 0.822 483.5 492.1 500.7 509.3 517.9 526.5 535.1 65 62.5 0.568 6.25 1.75 0.781 483.7 492.3 500.9 509.5 518.1 526.7 535.3 64 61.0 0.541 5.95 2.05 0.744 483.8 492.4 501.0 509.6 518.3 526.9 535.5 63 59.5 0.515 5.66 2.34 0.708 484.0 492.6 501.2 509.8 518.5 527.1 535.7 62 58.0 0.489 5.38 2.62 0.672 484.2 492.8 501.4 510.0 518.7 527.3 535.9 61 56.5 0.465 5.12 2.88 0.640 484.3 492.9 501.5 510.1 518.8 527.4 536.0 60 55.0 0.442 4.87 3.13 0.609 484.4 493.0 501.6 510.2 518.9 527.5 536.1 59 53.5 0.421 4.62 3.38 0.578 484.6 493.2 501.8 510.4 519.1 527.7 536.3 58 52.0 0,400 4.40 3.60 0.550 484.7 493.3 501.9 510.5 519.2 527.8 536.4 57 50.5 0.380 4.18 3.82 0.522 484.8 493.4 502.0 510.6 519.3 527.9 536.5 56 49.0 0.361 3.96 4.04 0.495 484.9 493.5 502.1 510.7 519.4 528.0 536.6 55 47.5 0.343 3.76 4.24 0.470 485.1 493.7 502.8 510.9 519.6 528.2 536.8 54 46.0 0.326 3.57 4.43 0.446 485.2 493.8 502.4 511.0 519.7 528.3 536.9 53 44.5 0.309 3.40 4.60 0.425 485.3 493.9 502.5 511.1 519.8 528.4 537.0 52 43.0 0.292 3.23 4.77 0.404 485.4 494.0 502.6 511.2 519.9 528.5 537.1 51 41.5 0.279 3.07 4.93 0.384 485.5 494.1 502.7 511.3 520.0 528.6 537.2 50 40.0 0.264 2.81 5.19 0.351 485.5 494.1 502.7 511.3 520.0 528.6 537.2 49 38.5 0.251 2.76 5.24 0.345 485.6 494.2 502.8 511.4 520.1 528.7 537.3 48 37.0 0.238 2.63 5.87 0.329 485.7 494.3 502.9 511.5 520.2 528.8 537.4 47 35.5 0.226 2.50 5.50 0.313 485.8 494.4 503.0 511.6 520.3 528.9 537.5 46 34.0 0.214 2.37 5.63 0.296 485.8 494.4 503.0 511.6 520.3 528.9 537.5 45 32.5 0.203 2.24 5.76 0.280 485.9 494.5 503.1 511.7 520.4 529.0 537.6 44 31.0 0.192 2.12 5.88 0.265 486.0 494.6 503.2 511.8 520.5 529.1 537.7 43 29.5 0.182 2.01 5.99 0.251 486.1 494.7 503.3 511.9 520.6 529.2 537.8 B 123 20 PSYCHROMETRICAL TABLES. Reading of Ther- mometer, Fahr. Temp of Dew- Point, Fahr. Force of Vapor in English Inches. Weight of Vapor Hu- midity, Satura- tion Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. Reqd. for Sat'n. ofaCu- bic Ft. of Air. Height of the Barometer in English Inches. 1.000. in. 28.0 in. 28.5 in. 29.0 in. 29.5 in. 30.0 in. 30.5 in. 31.0 Dry. Wet. 0 o o in. gr. gr- gr- gr. gr. gr- gr- gr gr. 71 71 71.0 0.751 8.25 0.00 1.000 481.6 490.2 498.8 507.4 516.0 524.6 533.2 70 69.5 0.715 7.86 0.39 0.953 481.8 490.4 499.0 507.6 516.2 524.8 533.4 69 68.0 0.681 7.48 0.77 0.907 482.0 490.6 499.2 507.8 516.4 525.0 533.6 68 66.5 0.648 7.13 1.12 0.865 482.2 490.8 499.4 508.0 516.6 525.2 533.8 67 65.0 0.617 6.79 1.46 0.823 482.4 491.0 499.6 508.2 516.8 525.4 534.0 66 63.5 0.588 6.45 1.80 0.782 482.6 491.2 499.8 508.4 517.0 525.6 534.2 65 62.0 0.559 6.14 2.11 0.744 482.8 491.4 500.0 508.6 517.2 525.8 534.4 64 60.5 0.532 5.85 2.40 0.709 483.0 491.6 500.2 508.8 517.4 526.0 534.6 63 59.0 0.506 5.56 2.69 0.674 483.1 491.7 500.3 508.9 517.5 526.1 534.7 62 57.5 0.481 5.28 2.97 0.640 483.2 491.8 500.4 509.0 517.7 526.3 534.9 61 56.0 0.458 5.03 3.22 0.609 483.3 491.9 500.5 509.1 517.8 526.4 535.0 60 54.5 0.435 4.78 3.47 0.579 483.5 492.1 500.7 509.3 518.0 526.6 535.1 59 53.0 0.414 4.54 3.71 0.550 483.6 492.2 500.8 509.4 518.1 526.7 535.2 58 51.5 0.393 4.31 3.94 0.522 483.8 492.4 501.0 509.6 518.3 526.9 535.4 57 50.0 0.373 4.10 4.15 0.497 483.9 492.5 501.1 509.7 518.4 527.0 535.5 56 48.5 0.355 3.89 4.36 0.471 484.0 492.6 501.2 509.9 518.5 527.1 535.6 55 47.0 0.337 3.69 4.56 0.447 484.1 492.7 501.3 510.0 518.6 527.2 535.7 54 45.5 0.320 3.51 4.74 0.425 484.2 492.8 501.4 510.1 518.7 527.3 535.8 53 44.0 0.304 3.33 4.92 0.404 484.3 492.9 501.5 510.2 518.8 527.4 535.9 52 42.5 0.288 3.16 5.09 0.383 484.4 493.0 501.6 510.3 518.9 527.5 536.0 51 41.0 0.274 3.00 5.25 0.364 484.5 493.1 501.7 510.4 519.0 527.6 536.1 50 39.5 0.260 2.85 5.40 0.345 484.6 493.2 501.8 510.5 519.1 527.7 536.2 49 38.0 0.246 2.70 5.55 0.327 484.7 493.3 501.9 510.6 519.2 527.8 536.3 48 36.5 0.234 2.57 5.68 0.312 484.7 493.3 501.9 510.6 519.2 527.8 536.3 47 35.0 0.222 2.44 5.81 0.296 484.8 493.4 502.0 510.7 519.3 527.9 536.4 46 33.5 0.210 2.31 5.94 0.280 484.9 493.5 502.1 510.8 519.4 528.0 536.5 45 32.0 0.199 2.19 6.06 0.265 485.0 493.6 502.2 510.9 519.5 528.1 536.6 44 30.5 0.189 2.08 6.17 0.252 485.0 493.6 502.2 510.9 519.5 528.1 536.6 72 72 72.0 0.776 8.50 0.00 1.000 480.6 489.2 497.8 506.4 514.9 523.5 532.1 71 70.5 0.739 8.10 0.40 0.953 480.8 489.4 498.0 506.5 515.1 523.7 532.3 70 69.0 0.704 7.71 0.79 0.907 481.0 489.6 498.2 506.7 515.3 523.9 532.5 69 67.5 0.670 7.35 1.15 0.865 481.2 489.8 498.4 506.9 515.5 524.1 532.7 68 66.0 0.638 7.00 1.50 0.824 481.4 490.0 498.5 507.1 515.7 524.3 532.9 67 64.5 0.607 6.66 1.84 0.784 481.6 490.2 498.7 507.3 515.9 524.5 533.1 66 63.0 0.578 6.33 2.17 0.745 481.7 490.3 498.8 507.4 516.1 524.7 533.3 65 61.5 0.550 6.03 2.47 0.710 481.8 490.4 499.0 507.6 516.2 524.8 533.4 64 60.0 0.523 5.73 2.77 0.674 482.0 490.6 499.2 507.8 516.4 525.0 533.6 63 58.5' 0.498 5.45 3.05 0.641 482.1 490.7 499.3 507.9 516.5 525.1 533.7 62 57.0 0.473 5.18 3.32 0.610 482.3 490.9 499.5 508.1 516.7 525.3 533.9 61 55.5 0.450 4.93 3.57 0.580 482.5 491.1 499.7 508.3 516.9 525.5 534.1 60 54.0 0.428 4.68 3.82 0.551 482.6 491.2 499.8 508.4 517.0 525.6 534.2 59 52.5 0.407 4.45 4.05 0.523 482.8 491.4 500.0 508.6 517.2 525.8 534.4 B 124 PSYCHROMETRICAL TABLES. 21 Reading of Ther- mometer, Fahr. Temp, of Dew- Point, Fahr. Force of Vapor in English Inches. Wei of Vi Sht ipor Reqd. for Sat'n. ofaCu- bic Ft. of Air. Hu- midity, Satura- Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. Height of the Barometer in English Inches. 1.000. in. 28.O in. 28.5 in. 29.0 in. 29.5 in. 30.0 in. 30.5 in. 31.0 Dry. Wet. ! o 0 o in. gr- gr. gr. gr. gr- gr- gr- gr. gr. 72 59 52.5 0.407 4.45 4.05 0.523 482.8 491.4 500.0 508.6 517.2 525.8 534.4 58 51.0 0.386 4.23 4.27 0.498 482.9 491.5 500.1 508.7 517.3 525.9 534.5 57 49.5 0.367 4.02 4.48 0.473 483.0 491.6 500.2 508.8 517.4 526.0 534.6 56 48.0 0.349 3.82 4.68 0.449 483.1 491.7 500.3 508.9 517.5 526.1 534.7 55 46.5 0.331 3.63 4.87 0.427 483.2 491.8 500.4 509.0 517.6 526.2 534.8 54 45.0 0.315 3.45 5.05 0.406 483.3 491.9 500.5 509.1 517.7 526.2 534.9 53 43.5 0.299 3.28 5.22 0.386 483.3 492.0 500.6 509.2 517.8 526.3 535.0 52 42.0 0.283 3.11 5.39 0.366 483.5 492.1 500.7 509.3 517.9 526.4 535.1 51 40.5 0.269 2.95 5.55 0.347 483.6 492.2 500.8 509.4 518.0 526.5 535.2 50 39.0 0.255 2.80 5.70 0.329 483.7 492.3 500.9 509.5 518.1 526.6 535.3 49 37.5 0.242 2.66 5.84 0.313 483.8 492.4 501.0 509.6 518.2 526.7 535.4 48 36.0 0.230 2.52 5.98 0.296 483.8 492.4 501.0 509.6 518.2 526.7 535.4 47 34.5 0.218 2.39 6.11 0.281 483.9 492.5 501.2 509.7 518.3 526.8 535.5 46 33.0 0.207 2.27 6.23 0.267 484.0 492.6 501.3 509.8 518.4 526.9 535.6 45 31.5 0.196 2.16 6.34 0.254 484.1 492.7 501.3 509.9 518.5 527.1 535.7 73 73 73.0 0.801 8.76 0.00 1.000 479.6 488.1 496.7 505.2 513.8 522.3 530.9 72 71.5 0.736 8.35 0.41 0.953 479.8 488.3 496.9 505.4 514.0 522.5 531.1 71 70.0 0.727 7.95 0.81 0.908 480.0 488.5 497.1 505.6 514.2 522.7 531.3 70 68.5 0.692 7.57 1.19 0.864 480.2 488.7 497.3 505.8 514.4 522.9 531.5 69 67.0 0.659 7.21 1.55 0.823 480.4 488.9 497.5 506.0 514.6 523.1 531.7 68 65.5 0.628 6.87 1.89 0.784 480.5 489.0 497.6 506.1 514.8 523.3 531.9 67 64.0 0.597 6.53 2.23 0.745 480.7 489.2 497.8 506.3 515.0 523.5 532.1 66 62.5 0.568 6.22 2.54 0.710 480.8 489.3 497.9 506.4 515.1 523.6 532.2 65 61.0 0.541 5.92 2.84 0.676 481.0 489.5 498.1 506.6 515.3 523.8 532.4 64 59.5 0.515 5.63 3.13 . 0.643 481.1 489.6 498.2 506.8 515.4 524.0 532.6 63 58.0 0.489 5.34 3.42 0.610 481.2 489.8 498.4 507.0 515.6 524.2 532.8 62 56.5 0.465 5.09 3.67 0.581 481.4 490.0 498.6 507.2 515.8 524.4 533.0 61 55.0 0.442 4.84 3.92 0.553 481.6 490.2 498.8 507.4 516.0 524.6 533.2 60 53.5 0.421 4.59 4.17 0.524 481.7 490.3 498.9 507.5 516.1 524.7 533.3 59 52.0 0.400 4.37 4.39 0.499 481.8 490.4 499.0 507.6 516.2 524.8 533.4 58 50.5 0.380 4.16 4.60 0.475 482.0 490.6 499.2 507.8 516.4 525.0 533.6 57 49.0 0.361 3.94 4.82 0.450 482.1 490.7 499.3 507.9 516.5 525.1 533.7 56 47.5 0.343 3.74 5.02 0.427 482.2 490.8 499.4 508.0 516.6 525.2 533.8 55 46.0 0.326 3.56 5.20 0.406 482.3 490.9 499.5 508.1 516.7 525.3 533.9 54 44.5 0.309 3.38 5.38 0.386 482.4 491.0 499.6 508.2 516.8 525.4 534.0 53 43.0 0.293 3.21 5.55 0.366 482.5 491.1 499.7 508.3 516.9 525.5 534.1 52 41.5 0.279 3.05 5.71 0.348 482.6 491.2 499.8 508.4 517.0 525.6 534.2 51 40.0 0.264 2.89 5.87 0.330 482.7 491.3 499.9 508.5 517.1 525.7 534.3 50 38.5 0.251 2.74 6.02 0.313 482.8 491.4 500.0 508.6 517^2 525.8 534.4 49 37.0 0.238 2.60 6.16 0.297 482.9 491.5 500.0 508.6 517.2 525.8 534.4 48 35.5 0.226 2.47 6.29 0.282 483.0 491.6 500.1 508.7 517.3 525.9 534.5 47 34.0 0.214 2.34 6.42 0.267 483.1 491.7 500.2 508.8 517.4 526.0 534.6 46 ! 32.5 0.203 2.22 6.54 0.253 433.3 491.9 500.4 509.1 517.6 526.2 534.8 B 125 22 PSYCHROMETRICAL TABLES. Reading of Ther- mometer, Fahr. Temp of Dew- Point, Fahr. Force of Vapor in English Inches. Weight of Vapor T» 1 Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. rwsqu. for Sat'n. ofaCu- bic Ft of Air. Height of the Barometer in English Inches. Dry. Wet. in. 28.O in. 28.5 in. 29.O in. 29.5 in. 3O.O in. 30.5 in. 31.O o 0 0 in. gr. gr. gr. gr. gr. gr. gr. gr- gr. 74 74 74.0 0.827 9.04 0.00 1.000 478.4 486.9 495.5 504.0 512.6 521.1 529.7 73 72.5 0.787 8.60 0.44 0.951 478.6 487.1 495.7 504.2 512.8 521.3 529.9 72 71.0 0.751 8.20 0.84 0.907 478.8 487.3 495.9 504.4 513.0 521.5 530.1 71 69.5 0.715 7.81 1.23 0.864 479.0 487.5 496.1 504.6 513.2 521.7 530.3 70 68.0 0.681 7.44 1.60 0.823 479.2 487.7 496.3 504.8 513.4 521.9 530.5 69 66.5 0.648 7.08 1.96 0.783 479.4 487.9 496.5 505.0 513.6 522.1 530.7 63 65.0 0.617 6.75 2.29 0.747 479.6 488.1 496.7 505.2 513.8 522.3 530.9 67 63.5 0.588 6.41 2.63 0.709 479.8 488.3 496.9 505.4 514.0 522.5 531.1 66 62.0 0.559 6.10 2.94 0.675 480.0 488.5 497.1 505.6 514.2 522.7 531.3 65 60.5 0.532 5.81 3.23 0.643 480.1 488.7 497.3 505.9 514.4 522.9 531.5 64 59.0 0.506 5.52 3.52 0.611 480.3 488.9 497.5 506.1 514.6 523.2 531.8 63 57.5 0.481 5.24 3.&0 0.580 480.5 489.1 497.7 506.3 514.8 523.4 532.0 62 56.0 0.458 4.99 4.05 0.552 480.6 489.2 497.8 506.4 514.9 523.5 532.1 61 54.5 0.435 4.75 4.29 0.525 480.7 489.3 497.9 506.5 515.0 523.6 532.2 60 53.0 0.414 4.52 4.52 0.500 480.9 489.5 498.1 506.7 515.2 523.8 532.4 59 51.5 0.393 4.29 4.75 0.475 481.0 489.6 498.2 506.8 515.3 523.9 532.5 58 50.0 0.373 4.08 4.96 0.451 481.1 489.7 498.3 506.9 515.4 524.0 532.6 57 48.5 0.355 3.86 5.18 0.427 481.2 489.8 498.4 507.0 515.5 524.1 532.7 56 47.0 0.337 3.66 5.38 0.405 481.3 489.9 498.5 507.1 515.6 524.2 532.8 55 45.5 0.320 3.48 5.56 0.385 481.4 490.0 498.6 507.2 515.7 524.3 532.9 54 44.0 0.304 3.32 5.72 0.367 481.5 490.1 498.7 507.3 515.8 524.4 533.0 53 42.5 0.288 3.15 5.89 0.348 481.6 490.2 498.8 507.4 515.9 524.5 533.1 52 41.0 0.274 2.99 6.05 0.331 481.7 490.3 498.9 507.5 516.0 524.6 533.2 51 39.5 0.260 2.83 6.21 0.313 481.8 490.4 499.0 507.6 516.1 524.7 533.3 50 38.0 0.246 2.69 6.35 0.298 481.9 490.5 499.1 507.7 516.2 524.8 533.4 49 36.5 0.234 2.55 6.49 0.282 481.9 490.5 499.1 507.7 516.2 524.8 533.4 48 35.0 0.222 2.42 6.62 0.268 482.0 490.6 499.2 507.8 516.3 524.9 533.5 47 33.5 0.210 2.30 6.74 0.254 482.1 490.7 499.2 507.9 516.4 525.0 533.6 75 75 75.0 0.854 9.31 0.00 1.000 477.4 485.9 494.4 502.9 511.5 520.0 528.5 74 73.5 0.814 8.87 0.44 0.953 477.6 486.1 494.6 503.1 511.7 520.2 528.7 73 72.0 0.776 8.45 0.86 0.908 477.8 486.3 494.8 503.3 511.9 520.4 528.9 72 70.5 0.739 8.05 1.26 0.865 478.0 486.5 495.0 503.5 512.1 520.6 529.1 71 69.0 0.704 7.67 1.64 0.824 478.2 486.7 495.2 503.7 512.3 520.8 529.3 70 67.5 0.670 7.30 2.01 0.784 478.3 486.8 495.3 503.8 512.5 521.0 529.5 69 66.0 0.638 6.95 2.36 0.746 478.5 487.0 495.5 504,0 512.7 521.2 529.7 68 64.5 0.607 6.62 2.69 0.711 478.7 487.2 495.7 504.2 512.9 521.4 529.9 67 63.0 0.578 6.30 3.01 0.677 478.9 487.4 495.9 504.4 513.1 521.6 530.1 66 61.5 0.550 5.99 3.32 0.643 479.1 487.6 496.1 504.6 513.3 521.8 530.3 65 60.0 0.523 5.69 3,62 0.611 479.3 487.8 496.4 504.9 513.5 522.0 530.6 64 58.5 0.498 5.42 3.89 0.582 479.5 488.0 496.6 505.1 513.7 522.2 530.8 63 57.0 0.473 5.15 4.16 0.553 479.6 488.1 496.7 505.2 513.8 522.3 530.9 62 55.5 0.450 4.90 4.41 0.526 479.7 484.2 496.8 505.3 513.9 522.4 531.0 B 126 PSYCHROMETRICAL TABLES. 23 Reading of Ther- mometer, Fahr. T,mp. Dew- Point, ?ahr. Force of Vapor in English Inches. Weight of Vapor Hu- midity, i°ooo7 Weight in Grains of a Cubic Foot of Air. * In a Cubic Foot of Air. .rvequ. for Sat'n. ofaCu- bic Ft. of Air. Height of the Barometer in English Inches. in. 28.0 in. 28.5 in. 29.0 in. 29.5 in. 3O.O in. 3O.5 in. 31.0 Dry. Wet. 0 0 o in. gr- gr. gr. gr- gr. gr. gr. gr- gr. 75 62 55.5 0.450 4.90 4.41 0.526 479.7 488.2 496.8 505.3 513.9 522.4 531.0 61 54.0 0.428 4.66 4.65 0.501 479.9 488.4 497.0 505.5 514.1 522.6 531.2 60 52.5 0.407 4.43 4.88 0.476 480.0 488.5 497.1 505.6 514.2 522.7 531.3 59 51.0 0.386 4.21 5.10 0.452 480.1 488.6 497.2 505.7 514.3 522.8 531.4 58 49.5 0.367 4.00 5.31 0.429 480.3 488.8 497.4 505.9 514.5 523.0 531.6 57 48.0 0.349 3.79 5.52 0.407 480.4 488.9 497.5 506.0 514.6 523.1 531.7 56 46.5 0.331 3.60 5.71 0.387 480.5 489.0 497.6 506.1 514.7 523.2 531.8 55 45.0 0.315 3.42 5.89 0.367 480.6 489.1 497.7 506.2 514.8 523.3 531.9 54 43.5 0.299 3.25 6.06 0.349 480.7 489.2 497.8 506.3 514.9 523.4 532.0 53 42.0 0.283 3.09 6.22 0.332 480.8 489.3 497.9 506.4 515.0 523.5 532.1 52 40.5 0.269 2.93 6.38 0.315 480.8 489.3 497.9 506.4 515.0 523.5 532.1 51 39.0 0.255 2.78 6.53 0.299 480.9 489.4 498.0 506.5 515.1 523.6 532.2 50 37.5 0.242 2.64 6.67 0.284 481.0 489.5 498.1 506.6 515.2 523.7 532.3 49 36.0 0.230 2.51 6.80 0.270 481.1 489.6 498.2 506.7 515.3 523.8 532.4 48 34.5 0.218 2.39 6.92 0.257 481.2 489.7 498.3 506.8 515.4 523.9 532.5 76 76 76.0 0.882 9.60 0.00 1.000 476.3 484.8 493.3 501.8 510.3 518.8 527.3 75 74.5 0.840 9.14 0.46 0.952 476.6 485.1 493.6 502.1 510.6 519.1 527.6 74 73.0 0.801 8.71 0.89 0.907 476.8 485.3 493.8 502.3 510.8 519.3 527.8 73 71.5 0.763 8.30 1.30 0.865 477.0 485.5 494.0 502.6 511.1 519.6 528.1 72 70.0 0.727 7.90 1.70 0.823 477.2 485.7 494.3 502.8 511.3 519.8 528.3 71 68.5 0.692 7.53 2.07 0.784 477.4 485.9 494.5 503.0 511.5 520.0 528.5 70 67.0 0.659 7.17 2.43 0.747 477.6 486.1 494.7 503.2 511.7 520.2 528.7 69 65.5 0.628 6.83 2.77 0.711 477.8 486.3 494.9 503.4 511.9 520.4 528.9 68 64.0 0.597 6.49 3.11 0.676 477.9 486.4 495.0 503.6 512.1 520.6 529.2 67 62.5 0.568 6.16 3.44 0.642 478.1 486.6 465.2 503.8 512.3 520.8 529.4 66 61.0 0.541 5.88 3.72 0.613 478.2 486.7 495.3 503.9 512.4 520.9 529.5 65 59.5 0.515 5.59 4.01 0.582 478.3 486.8 495.4 504.0 512.5 521.0 529.6 64 58.0 0.489 5.31 4.29 0.553 478.5 487.0 495.6 504.2 512.7 521.2 529.8 63 56.5 0.465 5.06 4.54 0.527 478.6 487.1 495.7 504.3 512.8 521.3 529.9 62 55.0 0.442 4.81 4.79 0.501 478.8 487.3 495.9 504.5 513.0 521.5 530.1 61 53.5 0.421 4.57 5.03 0.476 479.0 487.5 496.1 504.7 513.2 521.7 530.3 60 52.0 0.400 4.34 5.26 0.452 479.1 487.6 496.2 504.8 513.3 521.8 530.4 59 50.5 o!sso 4.13 5.47 0.430 499.2 487.7 496.3 504.9 513.4 521.9 530.5 58 49.0 0.361 3.92 5.68 0.408 499.3 487.8 496.4 505.0 513.5 522.0 530.6 57 47.5 0.343 3.73 5.87 0.389 499.4 487.9 496.5 505.1 513.6 522.1 530.7 56 46.0 0.326 3.54 6.06 0.369 499.5 488.0 496.6 505.2 513.7 522.2 530.8 55 44.5 0.309 3.36 6.24 0.351 499.6 488.1 496.7 505.3 513.8 522.3 530.9 54 43.0 0.293 3.19 6.41 0.332 499.7 488.2 496.8 505.4 518.9 522.4 531.0 53 41.5 0.279 3.03 6.57 0.316 499.8 488.3 496.9 505.5 514.0 522.5 531.1 52 40.0 0.264 2.88 6.72 0.301 499.9 488.4 497.0 505.6 514.1 522.6 531.2 51 38.5 0.251 2.73 6.87 0.284 500.0 488.5 497.1 505.7 514.2 522.7 531.3 50 37.0 0.238 2.59 7.01 0.269 500.1 488.6 497.2 505.8 514.3 522.8 531.4 49 35.5 0.226 2.46 7.14 0.256 500.2 488.7 497.3 505.9 514.4 522.9 531.5 B 127 24 PSYCHROMETRICAL TABLES. Reading of Ther- mometer! Fahr. Temp, of Dew- Point, Fahr. Force of Vapor in English Inches. Weight of Vapor Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. Reqd. for Sat'n. ofaCu- bic Ft. of Air. Height of the Barometer in English Inches. in. 28.0 in. 28.5 in. 29.0 in. 29.5 in. 30.0 in. 30.5 in. 31.0 Dry. Wet. o o o in. gr. gr- gr- gr- gr. gr- gr. gr. gr- 77 77 77.0 0.910 9.89 0.00 1.000 475.3 483.8 492.3 500.8 509.2 517.7 526.2 76 75.5 0.868 9.42 0.47 0.953 475.5 484.0 492.5 501.0 509.4 517.9 526.4 75 74.0 0.827 8.99 0.90 0.909 475.7 484.2 492.7 501.2 509.6 518.1 526.6 74 72.5 0.787 8.57 1.32 0.867 475.9 484.4 492.9 501.4 509.9 518.4 526.9 73 71.0 0.751 8.15 1.74 0.824 476.1 484.6 493.1 501.6 510.1 518.6 527.1 72 69.5 0.715 7.77 2.12 0.786 476.3 484.8 493.3 501.8 510.3 518.8 527.3 71 68.0 0.681 7.40 2.49 0.748 476.5 485.0 493.5 502.0 510.5 519.0 527.5 70 66.5 0.648 7.04 2.85 0.712 476.7 485.2 493.7 502.2 510.7 519.2 527.7 69 65.0 0.617 6.71 3.18 0.678 476.9 485.4 493.9 502.4 510.9 519.4 527.9 68 63.5 0.588 6.37 3.52 0.644 477.0 485.6 494.1 502.6 511.1 519.6 528.1 67 62.0 0.559 6.06 3.83 0.613 477.2 485.8 494.3 502.8 511.3 519.8 528.3 66 60.5 0.532 5.77 4-12 0.583 477.4 486.0 494.5 503.0 511.5 520.0 528.5 65 59.0 0.506 5.49 4.40 0.556 477.5 486.1 494.6 503.1 511.6 520.1 528.6 64 57.5 0.481 5.21 4.68 0.527 477.7 486.3 494.8 503.3 511.8 520.3 528.8 63 56.0 0.458 4.96 4.93 0.501 477.9 486.5 495.0 503.5 512.0 520.5 529.0 62 54.5 0.435 4.70 5.19 0.476 478.0 486.6 495.1 503.7 512.1 520.6 529.1 61 53.0 0.414 4.49 5.40 0.454 478.0 486.6 495.1 503.7 512.2 520.7 529.3 60 51.5 0.393 4.26 5.63 0.431 478.1 486.7 495.2 503.8 512.3 520.8 529.4 59 50.0 0.373 4.05 5.84 0.410 478.2 486.8 495.3 503.9 512.4 520.9 529.5 58 48.5 0.355 3.85 6.04 0.389 478.3 486.9 495.4 504.0 512.5 521.0 529.6 57 47.0 0.337 3.65 6.24 0.369 478.5 487.1 495.6 504.1 512.7 521.2 529.8 56 45.5 0.320 3.47 6.42 0.351 478.6 487.2 495.7 504.2 512.8 521.3 529.9 55 44.0 0.304 3.29 6.60 0.333 478.7 487.3 495.8 504.3 512.9 521.4 530.0 54 42.5 0.288 3.13 6.76 0.317 478.8 487.4 495.9 504.4 513.0 521.5 530.1 53 41.0 0.274 2.97 6.92 0.301 478.9 487.5 496.0 504.5 513.1 521.6 530.2 52 39.5 0.260 2.82 7.07 0.285 479.0 487.6 496.1 504.6 513.2 521.7 530.3 51 38.0 0.246 2.67 7.22 0.270 479.1 487.7 496.2 504.7 513.3 521.8 530.4 50 36.5 0.234 2.53 7.36 0.256 479.1 487.7 496.2 504.7 513.3 521.8 530.4 78 78 78.0 0.940 10.19 0.00 1.000 474.1 482.5 491.0 499.4 508.0 516.4 524.9 77 76.5 0.896 9.72 0.47 0.954 474.4 482.9 491.4 499.9 508.3 516.7 525.2 76 75.0 0.854 9.25 0.94 0.908 474.7 483.2 491.6 500.1 508.6 517.1 525.6 75 73.5 0.814 8.82 1.37 0.865 474.9 483.4 491.8 500.3 •508.8 517.3 525.8 74 72.0 0.776 8.40 1.79 0.824 475.2 483.7 492.1 500.6 509.1 517.6 526.1 73 70.5 0.739 8.00 2.19 0.785 475.4 483.9 492.3 500.8 500.3 517.8 526.3 72 69.0 0.704 7.62 2.57 0.748 475.6 484.1 492.5 501.0 509.5 518.0 526.5 71 67.5 0.670 7.25 2.94 0.711 475.8 484.3 492.7 501.2 509.7 518.2 526.7 70 66.0 0.638 6.91 3.28 0.678 475.9 484.4 492.9 501.4 509.9 518.4 526.9 69 64.5 0.607 6.58 3.61 0.646 476.1 484.6 493.1 501.6 510.1 518.6 527.1 68 63.0 0.578 6.26 3.93 0.614 476.3 484.8 493.3 501.8 510.3 518.8 527.3 67 61.5 0.550 5.96 4.23 0.585 476.4 484.9 493.4 501.9 510.4 518.9 527.4 66 60.0 0.523 5.66 4.53 0.555 476.6 4S5.1 493.6 502.1 510.6 519.1 527.6 65 58.5 0.498 5.38 4.81 0.528 476.8 485.3 493.8 502.3 510.8 519.3 527.8 B 128 PSYCHROMETRICAL TABLES. 25 Reading of Ther- mometer, Fahr. Temp, of Dew- Point, Fahr. Force of Vapor in English Inches. Weight of Vapor Hu- nidity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. rvequ. for Sat'n. ofaCu- bic Ft. of Air. Height of the Barometer in English Inches. Dry. Wet. in. 28.0 in. 28.5 in. 29.0 in. 29.5 in. 30.0 in. 30.5 in. 31.0 o 0 o in. gr- gr. gr- gr- gr. gr. gr. gr- gr- 78 65 58.5 0.498 5.38 4.81 0.528 476.8 485.3 493.8 502.3 510.8 519.3 527.8 64 57.0 0.473 5.12 5.07 0.502 476.8 485.3 493.9 502.4 510.9 519.4 527.9 63 55.5 0.450 4.88 5.31 0.479 476.9 485.4 494.0 502.5 511.0 519.5 528.0 62 54.0 0.428 4.63 5.56 0.454 477.1 485.6 494.2 502.7 511.2 519.7 528.2 61 52.5 0.407 4.40 5.79 0.432 477.2 485.7 494.3 502.8 511.3 519.8 528.3 60 51.0 0.386 4.18 6.01 0.409 477.3 485.8 494.4 502.9 511.4 519.9 528.4 59 49.5 0.367 3.98 6.21 0.391 477.4 485.9 494.5 503.0 511.5 520.0 528.5 58 48.0 0.349 3.78 6.41 0.371 477.5 486.0 494.6 503.1 511.6 520.1 528.6 57 46.5 0.331 3.59 6.60 0.352 477.6 486.1 494.7 503.2 511.7 520.2 528.7 56 45.0 0.315 3.41 6.78 0.335 477.8 486.3 494.8 503.3 511.9 520.4 528.9 55 43.5 0.299 3.24 6.95 0.318 477.9 486.4 494.9 503.4 512.0 520.5 529.0 54 42.0 0.283 3.07 7.12 0.301 478.0 486.5 495.0 503.5 512.1 520.6 529.1 53 40.5 0.269 2.92 7.27 0.287 478.1 486.5 495.0 503.5 512.1 520.6 529.1 52 39.0 0.255 2.77 7.42 0.272 478.2 486.6 495.1 503.6 512.2 520.7 529.2 51 37.5 0.242 2.63 7.56 0.258 478.3 486.7 495.2 503.7 512.3 520.8 529.3 79 79 79.0 0.970 10.50 0.00 1.000 47S.1 481.5 490.0 498.4 506.9 515.3 523.8 78 77.5 0.925 10.01 0.49 0.953 473.4 481.8 490.3 498.7 507.2 515.6 524.1 77 76.0 0.882 9.54 0.96 0.909 473.7 482.1 490.6 499.0 507.5 515.9 524.4 76 74.5 0.840 9.10 1.40 0.867 473.8 482.2 490.7 499.2 507.7 516.2 524.7 75 73.0 0.801 8.66 1.84 0.825 474.0 482.4 490.9 499.4 507.9 516.4 524.9 74 71.5 0.763 8.25 2.25 0.786 474.3 482.7 491.2 499.7 508.2 516.7 525.2 73 70.0 0.727 7.86 2.64 0.749 474.5 482.9 491.4 499.9 508.4 516.9 525.4 72 68.5 0.692 7.48 3.02 0.712 474.7 483.1 491.6 500.1 508.6 517.1 525.6 71 67.0 0.659 7.12 3.38 0.678 474.9 483.4 491.9 500.4 508.8 517.3 525.8 70 65.5 0.628 6.79 3.71 0.647 475.1 483.6 462.1 500.6 509.0 517.5 526.0 69 64.0 0.597 6.45 4.05 0.614 475.3 483.8 492.3 500.8 509.2 517.7 526.2 68 62.5 0.568 6.14 4.36 0.585 475.4 483.9 492.4 500.9 509.3 517.8 526.3 67 61.0 0.541 5.84 4.66 0.556 475.6 484.1 492.6 501.1 509.5 518.0 526.5 66 59.5 0.515 5.55 4.95 0.529 475.7 484.2 492.7 501.2 509.6 518.1 526.6 65 58.0 0.489 5.28 5.22 0.503 475.8 484.3 492.8 501.3 509.8 518.3 526.8 64 56.5 0.465 5.02 5.48 0.478 476.0 484.5 493.0 501.5 510.0 518.5 527.0 63 55.0 0.442 4.78 5.72 0.455 476.1 484.6 493.1 501.6 510.1 518.6 527.1 62 53.5 0.421 4.54 5.96 0.432 476.3 484.8 493.3 501.8 510.3 518.8 527.3 61 52.0 0.400 4.31 6.19 0.410 476.4 484.9 493.4 501.9 510.4 518.9 527.4 60 50.5 0.380 4.10 6.40 0.390 476.5 485.0 493.5 502.0 510.5 519.0 527.5 59 49.0 0.361 3.90 6.60 0.371 476.6 485.1 493.6 502.1 510.6 519.1 527.6 58 47.5 0.343 3.71 6.79 0.353 476.7 485.2 493.7 502.2 510.7 519.2 527.7 57 46.0 0.326 3.52 6.98 0.335 476.8 485.3 493.8 502.3 510.8 519.3 527.8 56 44.5 0.309 3.34 7.16 0.318 476.9 485.4 493.9 502.4 510.9 519.4 527.9 55 43.0 0.293 3.17 7.33 0.301 477.0 485.5 494.0 502.5 511.0 519.5 528.0 54 41.5 0.279 3.01 7.49 0.287 477.1 485.6 494.1 502.6 511.1 519.6 528.1 53 40.0 0.264 2.86 7.64 0.272 477.2 485.7 494.2 502.7 511.2 519.7 528.2 52 38.5 0.251 2.72 7.78 0.260 477.3 485.8 494.3 502.8 511.3 519.8 528.3 B 129 26 PSYCHROMETRICAL TABLES. Beading of Ther- mometer, Fahr. Temp, of Dew- Point, Fahr. Force of Vapor English Inches. Weight of Vapor T>AM*4 Hu- midity, Satura- l°S)oT Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. for Sat'n. ofaCu- bic Ft. of Air. Height of the Barometer in English Inches. in. 28.0 in. 28.5 in. 29.0 in. 29.5 in. 30.0 in. 30.5 in. 31.O Dry. Wet. o o 0 in. gr- gr- gr- gr. gr. gr- gr- gr. gr 80 80 80.0 1.001 10.81 0.00 1.000 472.0 480.4 488.9 497.3 505.7 514.1 522.6 79 78.5 0.955 10.31 0.50 0.954 472.3 480.7 489.1 497.5 506.0 514.4 522.9 78 77.0 0.910 9.83 0.98 0.909 472.5 480.9 489.4 497.9 506.3 514.7 523.2 77 75.5 0.868 9.37 1.44 0.867 472.7 481.1 489.6 498.1 506.5 514.9 523.4 76 74.0 0.827 8.93 1.88 0.826 473.0 481.4 489.9 498.4 506.8 515.2 523.7 75 72.5 0.787 8.50 2.31 0.786 473.2 481.6 490.1 498.6 507.0 515.4 523.9 74 71.0 0.751 8.11 2.70 0.750 473.4 481.8 490.3 498.8 507.2 515.6 524.1 73 69.5 0.715 7.71 3.10 0.713 473.6 482.1 490.6 499.1 507.5 515.9 524.4 72 68.0 0.681 7.35 3.46 0.680 473.8 482.3 490.8 499.3 507.7 516.1 524.6 71 66.5 0.648 6.99 3.82 0.647 474.0 482.5 491.0 499.5 507.9 516.3 524.8 70 65.0 0.617 6.66 4.15 0.616 474.2 482.7 491.2 499.7 508.1 516.5 525.0 69 63.5 0.588 6.33 4.48 0.586 474.4 482.9 491.4 499.9 508.3 516.7 525.2 68 62.0 0.559 6.03 4.78 0.558 474.5 483.0 491.5 500.0 508.4 516.8 525.3 67 60.5 0.532 5.74 5.07 0.531 474.7 483.2 491.7 500.2 508.6 517.0 525.5 66 59.0 0.506 5.45 5.36 0.504 474.9 483.4 491.9 500.4 508.8 517.2 525.7 65 57.5 0.481 5.18 5.63 0.479 475.0 483.5 492.0 500.5 508.9 517.3 525.8 64 56.0 0.458 4.93 5.96 0.456 475.2 483.7 492.2 500.7 509.1 517.5 526.0 63 54.5 0.435 4.69 6.12 0.434 475.3 483.8 492.3 500.8 509.2 517.6 526.1 62 53.0 0.414 4.46 6.35 0.413 475.4 483.9 492.4 500.9 509.3 517.7 526.2 61 51.5 0.393 4.23 6.58 0.391 475.5 484.0 492.5 501.0 509.4 517.8 526.3 60 50.0 0.373 4.02 6.79 0.372 475.6 484.1 492.6 501.1 509.5 517.9 526.4 59 48.5 0.355 3.82 6.99 0.353 475.7 484.2 492.7 501.2 509.6 518.0 526.5 58 47.0 0.337 3.63 7.18 0.336 475.9 484.4 492.9 501.4 509.8 518.2 526.7 57 45.5 0.320 3.45 7.36 0.319 476.0 484.5 493.1 501.5 509.9 518.3 526.8 56 44.0 0.304 3.27 7.54 0.302 476.1 484.6 493.2 501.6 510.0 518.4 526.9 55 42.5 0.288 3.11 7.70 0.288 476.2 484.7 493.3 501.7 510.1 518.5 527.0 54 41.0 0.274 2.96 7.85 0.274 476.3 484.8 493.4 501.8 510.2 518.6 527.1 53 39.5 0.260 2.82 7.99 0.261 476.3 484.8 493.4 501.8 510.2 518.6 527.1 81 81 81.0 1.034 11.14 0.00 1.000 471.0 479.4 487.8 496.2 504.6 513.0 521.4 80 79.5 0.986 10.62 0.52 0.953 471.3 479.7 488.1 496.5 504.9 513.3 521.7 79 78.0 0.940 10.13 1.01 0.910 471.5 479.9 488.4 496.8 505.2 513.6 522.1 78 76.5 0.896 9.65 1.49 0.866 471.7 480.1 488.6 497.0 505.4 513.8 522.3 77 75.0 0.854 9.20 1.94 0.826 472.0 480.4 488.9 497.3 505.7 514.1 522.6 76 73.5 0.814 8.77 2.37 0.787 472.2 480.6 489.1 497.5 505.9 514.3 522.8 75 72.0 0.776 8.35 2.79 0.750 472.5 480.9 489.4 497.8 506.2 514.6 523.1 74 70.5 0.739 7.95 3.19 0.713 472.6 481.0 489.5 4919 506.4 514.8 523.3 73 69.0 0.704 7.57 3.57 0.680 472.8 481.2 489.7 498.1 506.6 515.0 523.5 72 67.5 0.670 7.21 3.93 0.647 473.0 481.4 489.9 498.3 506.8 515.2 523.7 71 66.0 0.638 6.87 4.27 0.617 473.2 481.6 490.1 498.5 507.0 515.4 523.9 70 64.5 0.607 6.54 4.60 0.587 473.4 481.8 490.3 498.7 507.2 515.6 524.1 69 63.0 0.578 6.22 4.92 0.558 473.6 482.0 490.5 498.9 507.4 515.8 524.3 68 61.5 0.550 5.92 5.22 0.531 473.7 482.2 490.7 499.1 507.6 516.0 524.5 B 130 PSYCHROMETRICAL TABLES. 27 Reading of Ther- mometer, Fahr. Temp, of Dew- Point, Fahr. Force of Vapor in English Inches. Weight, of Vapor Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. jieqa. for Sat'n. ofaCu- bic Ft. of Air. Height of the Barometer in English Inches. in. 28.O in. 28.5 in. 29.0 in. 29.5 in. 30.0 in. 30.5 in. 31.0 Dry. o 81 Wet. 0 68 o 61.5 in. 0.550 gr- 5.92 gr- 5.22 0.531 gr. 473.7 gr- 482.2 gr- 490.7 gr. 499.1 gr- 507.6 gr- 516.0 gr- 524.5 67 60.0 0.523 5.62 5.52 0.505 473.8 482.3 490.8 499.2 507.7 516.1 524.6 • 66 58.5 0.498 5.31 5.83 0.477 474.0 482.5 491.0 499.4 507.9 516.3 524.8 65 57.0 0.473 5.08 6.06 0.456 474.1 482.6 491.1 499.5 508.0 516.4 524.9 64 55.5 0.450 4.84 6.30 0.434 474.3 482.8 491.3 499.7 508.2 516.6 525.1 63 54.0 0.428 4.60 6.54 0.413 474.4 482.9 491.4 499.8 508.3 516.7 525.2 62 52.5 0.407 4.37 6.77 0.392 474.5 483.0 491.5 499.9 508.4 516.8 525.3 61 51.0 0.386 4.15 6.99 0.373 474.6 483.1 491.6 500.0 508.5 516.9 525.4 60 49.5 0.367 3.95 7.19 0.355 474.7 483.2 491.7 500.1 508.6 517.0 525.5 59 48.0 0.349 3.75 7.39 0.337 474.9 483.4 491.9 500.3 508.8 517.2 525.7 58 46.5 0.331 3.56 7.58 0.320 475.0 483.5 492.0 500.4 508.9 517.3 525.8 57 45.0 0.315 3.38 7.76 0.303 475.1 483.6 492.1 500.5 509.0 517.4 525.9 56 43.5 0.299 3.21 7.93 0.289 475.2 483.7 492.2 500.6 509.1 517.5 526.0 55 42.0 0.283 3.05 8.09 0.274 475.3 483.8 492.3 500.7 509.2 517.6 526.1 54 40.5 0.269 2.90 8.24 0.260 475.3 483.8 492.3 500.7 509.2 517.6 526.1 82 82 82.0 1.067 11.47 0.00 1.000 470.0 478.4 486.8 495.2 503.5 511.9 520.3 81 80.5 1.017 10.94 0.53 0.954 470.3 478.7 487.0 495.4 503.8 512.2 520.6 80 79.0 0.970 10.44 1.03 0.910 470.6 479.0 487.3 495.7 504.1 512.5 520.9 79 77.5 0.925 9.95 1.52 0.868 470.7 479.1 487.5 495.9 504.3 512.7 521.1 78 76.0 0.882 9.49 1.98 0.827 471.0 479.4 487.8 496.2 504.6 513.0 521.4 77 74.5 0.840 9.03 2.44 0.787 471.2 479.6 488.0 496.4 504.8 513.2 521.6 76 73.0 0.801 8.60 2.87 0.750 471.5 479.9 488.3 496.7 505.1 513.5 521.9 75 71.5 0.763 8.19 3.28 0.714 471.6 480.0 488.5 496.9 505.3 513.7 522.1 74 70.0 0.727 7.81 3.66 0.681 471.8 480.2 488.6 497.1 505.5 513.9 522.4 73 68.5 0.692 7.43 4.04 0.648 472.0 480.4 488.8 497.3 505.7 514.1 522.6 72 67.0 0.659 7.08 4.39 0.618 472.2 480.6 489.0 497.5 505.9 514.3 522.8 71 65.5 0.628 6.75 4.72 0.588 472.4 480.8 489.2 497.7 506.1 514.5 523.0 70 64.0 0.597 6.41 5.06 0.559 472.5 480.8 489.4 497.9 506.3 514.7 523.2 69 62.5 0.568 6.10 5.37 0.532 472.6 481.0 489.5 498.0 506.4 514.8 523.3 68 61.0 0.541 5.81 5.66 0.507 472.8 481.2 489.7 498.2 506.6 515.0 523.5 67 59.5 0.515 5.52 5.95 0.481 473.0 481.4 489.9 498.4 506.8 515.2 523.7 66 58.0 0.489 5.25 6.22 0.458 473.1 481.5 490.0 498.5 506.9 515.3 523.8 65 56.5 0.465 4.99 6.48 0.435 473.2 481.6 490.1 498.6 507.0 515.4 523.9 64 55.0 0.442 4.75 6.72 0.414 473.4 481.8 490.3 498.8 507.2 515.6 524.1 63 53.5 0.421 4.51 6.96 0.393 473.5 482.0 490.5 499.0 507.4 515.8 524.3 62 52.0 0.400 4.29 7.18 0.374 473.6 482.1 490.6 499.1 507.5 515.9 524.4 61 50.5 0.380 4.08 7.39 0.356 473.7 482.2 490.7 499.2 507.6 516.0 524.4 60 49.0 0.361 3.87 7.60 0.337 473.8 482.3 490.8 499.3 507.7 516.1 524.5 ' 59 47.5 0.343 3.68 7.79 0.320 473.9 482.4 490.9 499.4 507.8 516.2 524.6 58 46.0 0.326 3.50 7.97 0.305 474.0 482.5 491.0 499.5 507.9 516.3 524.7 57 44.5 0.309 3.32 8.15 0.289 474.1 482.6 491.1 499.6 508.0 516.4 524.8 56 43.0 0.293 3.15 8.32 0.274 474.2 482.7 491.2 499.7 508.1 516.5 524.9 55 41.5 0.279 2.99 8.48 0.260 474.3 482.8 491.3 499.8 508.2 516.6 525.1 B 131 28 PSYCHROMETRICAL TABLES. Reading of Ther- mometer, Fahr. Temp of Dew- Point, Fahr. Force of Vapor in English Inches. Weight of Vapor Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. rwjqu.. for Sat'n. ofaCu- bic Ft. of Air. Height of the Barometer in English Inches. in. 28.0 in. 28.5 in. 29.0 in. 29.5 in. 30.0 in. 30.5 in. 31.O Dry. Wet. o o o in. gr- gr- gr- gr. gr. gr. gr. gr- gr. 83 83 83.0 1.101 11.82 0.00 1.000 468.8 477.2 485.5 493.9 502.3 510.6 519.0 82 81.5 1.050 11.27 0.55 0.953 469.1 477.5 485.8 494.2 502.6 511.0 519.4 81 80.0 1.001 10.75 1.07 0.909 469.4 477.8 486.1 494.5 502.9 511.3 519.7 80 78.5 0.955 10.25 1.57 0.868 469.7 478.1 486.4 494.8 503.2 511.6 520.0 79 77.0 0.910 9.78 2.04 0.828 470.0 478.4 486.7 495.1 503.5 511.9 520.3 78 75.5 0.868 9.31 2.51 0.786 470.3 478.7 487.0 495.4 503.8 512.2 520.6 77 74.0 0.827 8.88 2.94 0.751 470.5 478.9 487.2 495.6 504.0 512.4 520.8 76 72.5 0.787 8.45 3.37 0.715 470.6 479.0 487.4 495.8 504.2 512.6 521.0 75 71.0 0.751 8.05 3.77 0.681 470.8 479.2 487.6 496.0 504.4 512.8 521.2 74 69.5 0.715 7.66 4.16 0.647 471.0 479.4 487.8 496.2 504.6 513.0 521.4 73 68.0 0.681 7.30 4.52 0.618 471.2 479.6 488.0 496.4 504.8 513.2 521.6 72 66.5 0.648 6.95 4.87 0.588 471.4 479.8 488.2 496.6 505.0 513.4 521.8 71 65.0 0.617 6.62 5.20 0.560 471.6 480.0 488.4 496.8 505.2 513.6 522.0 70 63.5 0.588 6.29 5.53 0.533 471.7 480.1 488.5 497.0 505.4 513.8 522.3 69 62.0 0.559 5.99 5.83 0.507 471.9 480.3 488.7 497.2 505.6 514.0 522.5 68 60.5 0.532 5.70 6.12 0.482 472.0 480.4 488.8 497.3 505.7 514.1 522.6 67 59.0 0.506 5.42 6.40 0.459 472.2 480.6 489.0 497.5 505.9 514.3 522.8 66 57.5 0.481 5.15 6.67 0.435 472.4 480.8 489.2 497.7 506.1 514.5 523.0 65 56.0 0.458 4.90 6.92 0.414 472.4 480.8 489.3 497.8 506.2 514.6 523.1 64 54.5 0.435 4.66 7.18 0.394 472.5 480.9 489.4 497.9 506.3 514.7 523.2 63 53.0 0.414 4.43 7.39 0.375 472.7 481.1 489.6 498.1 506.5 514.9 523.4 62 51.5 0.393 4.21 7.61 0.356 472.8 481.2 489.7 498.2 506.6 515.0 523.5 61 50.0 0.373 4.00 7.82 0.339 472.9 481.3 489.8 498.3 506.7 515.1 523.6 60 48.5 0.355 3.80 8.02 0.322 473.1 481.4 489.9 498.4 506.8 515.2 523.7 59 47.0 0.337 3.60 8.22 0.305 473.2 481.5 490.0 498.5 506.9 515.3 523.8 58 45.5 0.320 3.42 8.40 0.289 473.3 481.6 490.1 498.6 507.0 515.4 523.9 57 44.0 0.304 3.25 8.57 0.276 473.4 481.7 490.2 498.7 507.1 515.5 524.0 56 42.5 0.288 3.09 8.73 0.261 473.5 481.8 490.3 498.8 507.2 515.6 524.1 84 84 84.0 1.136 12.17 0.00 1.000 467.8 476.2 484.5 492.7 501.2 509.6 517.9 83 82.5 1.083 11.61 0.56 0.954 468.1 476.4 484.8 493.2 501.5 509.8 518.2 82 81.0 1.034 11.07 1.10 0.910 468.4 476.7 485.1 493.5 501.8 510.1 518.5 81 79.5 0.986 10.55 1.62 0.867 468.6 476.9 485.4 493.7 502.1 510.5 518.8 80 78.0 0.940 10.07 2.10 0.827 468.9 477.3 485.7 494.0 502.4 510.8 519.1 79 76.5 0.896 9.59 2.58 0.788 469.1 477.5 485.9 494.2 502.6 511.0 519.3 78 75.0 0.854 9.14 3.03 0.751 469.4 477.8 486.1 494.5 502.9 511.3 519.7 77 73.5 0.814 8.71 3.46 0.716 469.6 478.0 486.3 494.7 503.1 511.5 519.9 76 72.0 0.776 8.30 3.87 0.682 469.8 478.2 486.5 494.9 503.3 511.7 520.1 75 70.5 0.739 7.90 4.27 0.649 470.1 478.5 486.8 495.2 503.6 512.0 520.4 74 69.0 0.704 7.53 4.64 0.619 470.3 478.7 487.0 495.4 503.8 512.2 520.6 73 67.5 0.670 7.17 5.00 0.589 470.5 478.9 487.2 495.6 504.0 512.4 520.8 72 66.0 0.638 6.83 5.34 0.561 470.6 479.0 487.4 495.8 504.2 512.6 521.0 71 64.5 0.607 6.50 5.67 0.534 470.7 479.1 487.5 495.9 504.3 512.7 521.1 B 132 PSYCHROMETRICAL TABLES. 29 Beading of Ther- mometer, Fanr. Temp, of Dew- Point, Fahr. Force of Vapor in English Inches. Weight of Vapor Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. iMjqu. for Sat'n. ofaCu- bic Ft. of Air. Height of the Barometer in English Inches. Dry. o 84 Wet. in. 28.0 in. 28.5 in. 29.0 in. 29.5 in. 30.0 in. 30.5 in. 31.0 o 71 o 64.5 in. 0.607 gr. 6.50 gr. 5.67 0.534 gr. 470.7 gr. 479.1 gr. 487.5 gr. 495.9 gr- 504.3 gr- 512.7 gr. 521.1 70 63.0 0.578 6.18 5.99 0.508 470.9 479.3 487.7 496.1 504.5 512.9 521.3 69 61.5 0.550 5.87 6.30 0.482 471.1 479.5 487.9 496.3 504.7 513.1 521.5 68 60.0 0.523 5.59 6.58 0.459 471.2 479.6 488.0 496.4 504.8 513.2 521.6 67 58.5 0.498 5.31 6.86 0.436 471.4 479.8 488.2 496.6 505.0 513.4 521.8 66 57.0 0.473 5.05 7.12 0.415 471.6 480.0 488.3 496.7 505.2 513.6 522.1 65 55.5 0.450 4.81 7.36 0.395 471.6 480.0 488.4 496.8 505.3 513.7 522.2 64 54.0 0.428 4.57 7.60 0.375 471.7 480.1 488.5 496.9 505.4 513.8 522.3 63 52.5 0.407 4.35 7.82 0.357 471.8 480.2 488.6 497.0 505.5 513.9 522.4 62 51.0 0.386 4.13 8.04 0.339 471.9 480.4 488.8 497.2 505.7 514.0 522.5 61 49.5 0.367 3.93 8.24 0.323 472.1 480.5 488.9 497.3 505.8 514.1 522.6 60 48.0 0.349 3.73 8.44 0.306 472.2 480.6 489.0 497.4 505.9 514.2 522.7 59 46.5 0.331 3.55 8.62 0.292 472.3 480.7 489.1 497.5 506.0 514.3 522.8 58 45.0 0.315 3.37 8.80 0.277 472.4 480.8 489.2 497.6 506.1 514.4 522.9 57 43.5 0.299 3.20 8.97 0.263 472.5 480.9 489.3 497.7 506.2 514.5 523.0 85 85 84 85.0 83.5 1.171 1.118 12.53 11.95 0.00 0.58 1.000 0.954 466.8 467.1 475.2 475.4 483.5 483.7 491.8 492.1 500.1 500.4 508.5 508.7 516.8 517.1 83 82.0 1.067 11.40 1.13 0.910 467.3 475.6 484.0 492.4 500.7 509.0 517.4 82 80.5 1.017 10.87 1.66 0.868 467.6 475.9 484.3 492.7 501.0 509.3 517.7 81 79.0 0.970 10.38 2.15 0.829 467.8 476.1 484.5 492.9 501.2 509.5 517.9 80 77.5 0.925 9.89 2.64 0.789 468.1 476.4 484.8 493.2 501.5 509.8 518.2 79 76.0 0.882 9.43 3.10 0.753 468.4 476.7 485.1 493.5 501.8 510.1 518.5 78 74.5 0.840 8.98 3.55 0.717 468.6 476.9 485.3 493.7 502.0 510.3 518.7 77 73.0 0.801 8.55 3.98 0.682 468.7 477.1 485.5 493.9 502.2 510.5 518.9 76 71.5 0.763 8.15 4.38 0.650 469.0 477.4 485.8 494.2 502.5 510.8 519.2 75 70.0 0.727 7.76 4.77 0.619 469.2 477.6 486.0 494.4 502.7 511.0 519.4 74 68.5 0.692 7.39 5.14 0.589 469.4 477.8 486.2 494.6 502.9 511.2 519.6 73 67.0 0.659 7.04 5.49 0.562 469.7 478.1 486.5 494.9 503.2 511.5 519.9 72 65.5 0.628 6.71 5.82 0.536 469.9 478.3 486.7 495.1 503.4 511.7 520.1 71 64.0 0.597 6.37 6.16 0.508 470.1 478.5 486.9 495.3 503.6 511.9 520.3 70 62.5 0.568 6.07 6.46 0.484 470.3 478.7 487.1 495.5 503.8 512.1 520.5 69 61.0 0.541 5.77 6.76 0.460 470.5 478.9 487.2 495.6 504.0 512.4 520.8 68 59.5 0.515 5.48 7.05 0.437 470.6 479.0 487.3 495.7 504.1 513.5 520.9 67 58.0 0.489 5.21 7.32 0.415 470.6 479.0 487.4 495.8 504.2 512.6 521.0 66 56.5 0.465 4.96 7.57 0.396 470.7 479.1 487.5 495.9 504.3 512.7 521.1 65 55.0 0.442 4.72 7.81 0.377 470.8 479.2 487.6 496.0 504.4 512.S 521.2 64 53.5 0.421 4.49 8.04 0.359 470.9 479.3 487.7 496.1 504.5 512.9 521.3 63 52.0 0.400 4.26 8.27 0.340 471.1 479.5 487.9 496.3 504.7 513.1 521.5 62 50.5 0.380 4.05 8.48 0.323 471.2 479.6 488.1 496.4 504.8 513.2 521.6 61 49.0 0.361 3.85 8.68 0.307 471.3 479.7 488.2 496.5 504.9 513.3 521.7 60 47.5 0.343 3.66 8.87 0.292 471.4 479.8 488.3 496.6 505.0 513.4 521.8 59 46.0 0.326 3.48 9.05 0.278 471.5 479.9 488.4 496.7 505.1 513.5 521.9 58 44.5 0.309 3.31 9.22 0.264 471.6 480.1 488.5 496.8 505.2 513.6 522.1 B 133 30 PSYCHROMETRICAL TABLES. Reading of Ther- mometer, Fahr. Temp of Dew- Point, Fahr! Force of Vapor in English Inches. Weight of Vapor T* 1 Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. xvequ. for Sat'n. ofaCu- bic Ft. of Air. Height of the Barometer in English Inches. in. 2S.O in. 28.5 in. 29.O in. 29.5 in. 3O.O in. 30.5 in. 31.0 Dry. o 86 Wet. o 86 0 86.0 in. .209 gr- 12.91 gr. 0.00 1.000 gr. 465.7 gr. 474.0 gr. 482.3 gr. 490.6 gr. 498.9 gr- 507.2 gr. 515.5 85 84.5 .153 12.31 0.60 0.954 466.0 474.3 482.6 490.9 499.2 507.5 515.8 84 83.0 .101 11.75 1.16 0.910 466.3 474.6 482.9 491.2 499.5 507.8 516.1 83 81.5 .050 11.20 1.71 0.868 466.5 474.8 483.2 491.5 499.8 508.1 516.5 82 80.0 .001 10.69 2.22 0.828 466.8 475.1 483.5 491.8 500.1 508.4 516.8 81 78.5 0.955 10.19 2.72 0.789 467.1 475.4 483.8 492.1 500.4 508.7 517.1 80 77.0 0.910 9.71 3.20 0.752 467.3 475.6 484.0 492.3 500.7 509.0 517.4 79 75.5 0.868 9.25 3.66 0.717 467.5 475.8 484.2 492.5 500.9 509.2 517.6 78 74.0 0.827 8.82 4.09 0.683 467.8 476.1 484.5 492.8 501.2 509.5 517.9 77 72.5 0.787 8.40 4.51 0.651 468.0 476.3 484.7 493.0 501.4 509.7 518.1 76 71.0 0.751 8.00 4.91 0.619 468.2 476.5 484.9 493.2 501.6 509.9 518.3 75 69.5 0.715 7.62 5.29 0.590 468.3 476.6 485.0 493.4 501.8 510.2 518.6 74 68.0 0.681 7.26 5.65 0.562 468.5 476.8 485.2 493.6 502.0 510.4 518.8 73 66.5 0.648 6.91 6.00 0.535 468.8 477.1 485.5 493.9 502.2 510.6 519.0 72 65.0 0.617 6.58 6.33 0.509 468.9 477.2 485.6 494.0 502.4 510.8 519.2 71 63.5 0.588 6.26 6.65 0.485 469.1 477.4 485.8 494.2 502.6 511.0 519.4 70 62.0 0.559 5.95 6.96 0.461 469.2 477.5 485.9 494.3 502.7 511.1 519.5 69 60.5 0.532 5.66 7.25 0.438 469.4 477.7 486.1 494.5 502.9 511.3 519.7 68 59.0 0.506 5.38 7.53 0.417 469.6 477.9 486.3 494.7 503.1 511.5 519.9 67 57.5 0.481 5.11 7.80 0.396 469.8 478.1 486.5 494.9 503.3 511.7 520.1 66 56.0 0.458 4.87 8.04 0.377 469.9 478.2 486.6 495.0 503.4 511.8 520.2 65 54.5 0.435 4.63 8.28 0.359 470.0 478.3 486.7 495.1 503.5 511.9 520.3 64 53.0 0.414 4.40 8.51 0.341 470.1 478.4 486.8 495.1 503.6 512.0 520.4 63 51.5 0.393 4.19 8.72 0.325 470.2 478.5 486.9 495.2 503.7 512.1 520.5 62 50.0 0.373 3.98 8.93 0.308 470.4 478.7 487.1 495.4 503.9 512.2 520.7 61 48.5 0.355 3.78 9.13 0.293 470.5 478.8 487.2 495.5 504.0 512.3 520.8 60 47.0 0.337 3.59 9.32 0.278 470.6 478.9 487.3 495.6 504.1 512.4 520.9 59 45.5 0.320 3.40 9.51 0.263 470.7 479.0 487.4 495.7 504.2 512.5 521.0 87 87 87.0 .247 13.29 0.00 1.000 464.5 472.8 481.1 489.4 497.7 506.0 514.3 86 85.5 .190 12.68 0.61 0.954 464.8 473.1 481.4 489.7 498.0 506.3 514.6 85 84.0 .136 12.10 1.19 0.910 465.1 473.4 481.7 490.0 498.3 506.6 514.9 84 82.5 .083 11.54 1.75 0.868 465.4 473.7 482.0 490.3 498.6 506.9 515.2 83 81.0 .034 11.01 2.28 0.828 465.7 474.0 482.3 490.6 498.9 507.2 515.5 82 79.5 0.986 10.49 2.80 0.789 466.0 474.3 482.6 490.9 499.2 507.5 515.8 81 78.0 0.940 10.01 3.28 0.753 466.3 474.6 482.9 491.2 499.5 507.8 516.1 80 76.5 0.896 9.54 3.75 0.718 466.5 474.8 483.1 491.4 499.8 508.1 516.5 79 75.0 0.854 9.09 4.20 0.684 466.8 475.1 483.5 491.8 500.1 508.4 516.8 78 73.5 0.814 8.66 4.63 0.652 467.0 475.3 483.7 492.0 500.3 508.6 517.0 77 72.0 0.776 8.24 5.05 0.620 467.2 475.5 483.9 492.2 500.5 508.8 517.2 76 70.5 0.739 7.85 5.44 0.591 467.3 475.6 484.0 492.3 500.7 509.0 517.4 75 69.0 0.704 7.48 5.81 0.563 467.5 475.8 484.2 492.5 500.9 509.2 517.6 74 67.5 0.670 7.12 6.17 0.536 467.7 476.0 484.4 492.7 501.1 509.4 517-8 B 134 PSYCHROMETRICAL TABLES. 31 Reading of Ther- mometer, Fahr. Temp, of Dew- Point Force of Vapor in Wei of V In a Cubic ght ipor "ReqdT for Sat'n. Hu- midity, Satura- tion Weight in Grains of a Cubic Foot of Air. Height of the Barometer in English Inches. Fahr.' English 1 iic lies. Foot of Air. ofaCu- jic Ft. 1.000. in. in. in. in. in. in. in. Dry. Wet. of Air. 28.O 28.5 29.O 29.5 30.0 30.5 31.0 o o o in. gr. gr- gr- gr. gr. gr. gr. gr- gr. 87 74 67.5 0.670 7.12 6.17 0.536 467.7 476.0 484.4 492.7 501.1 509.4 517.8 73 66.0 0.638 6.78 6.51 0.510 467.9 476.2 484.6 492.9 501.3 509.6 518.0 72 64.5 0.607 6.46 6.83 0.486 468.1 476.4 484.8 493.1 501.5 509.8 518.2 71 63.0 0.578 6.14 7.15 0.462 468.3 476.6 485.0 493.3 501.7 510.1 518.5 70 61.5 0.550 5.85 7.44 0.440 468.4 476.7 485.1 493.5 501.9 510.3 518.7 69 60.0 0.523 5.56 7.73 0.418 468.5 476.9 485.3 493.7 502.0 510.4 518.8 68 58.5 0.498 5.28 8.01 0.397 468.7 477.1 485.5 493.9 502.2 510.6 519.0 67 57.0 0.473 5.02 8.27 0.378 468.8 477.? 485.6 494.0 502.3 510.7 519.1 66 55.5 0.450 4.77 8.52 0.359 468.9 477.3 485.7 494.1 502.4 510.7 519.2 65 54.0 0.428 4.54 8.75 0.342 469.1 477.5 485.9 494.3 502.6 510.9 519.4 64 52.5 0.407 4.33 8.96 0.326 469.2 477.6 486.1 494.4 .02.7 511.0 519.5 63 51.0 0.386 4.12 9.17 0.310 469.3 477.7 486.2 494.5 .02.8 511.1 519.6 62 49.5 0.367 3.91 9.38 0.294 469.4 477.8 486.3 494.6 .02.9 511.2 519.7 61 48.0 0.349 3.71 9.58 0.279 469.6 477.9 486.5 494.8 503.1 511.4 519.9 60 46.5 0.331 3.51 9.78 0.264 469.7 478.1 486.6 494.9 503.2 511.5 520.0 88 88 88.0 .286 13.68 0.00 1.000 463.5 471.7 480.0 488.3 496.6 504.8 513.1 87 86.5 .228 13.06 0.62 0.954 463.8 472.0 480.3 488.6 496.9 505.1 513.4 86 85.0 .171 12.46 1.22 0.911 464.2 472.4 480.7 489.0 497.3 505.6 513.9 85 83.5 .118 11.88 1.80 0.868 464.4 472.7 481.0 489.3 497.6 505.9 514.2 84 82.0 .067 11.34 2.34 0.829 464.7 473.0 481.3 489.6 497.9 506.2 514.5 83 80.5 .017 10.81 2.87 0.790 465.0 473.3 481.6 489.9 498.2 506.5 514.8 82 79.0 0.970 10.31 3.37 0.754 465.2 473.5 481.8 490.1 498.4 506.7 515.0 81 77.5 0.925 9.83 3.85 0.718 465.5 473.8 482.1 490.4 498.7 507.0 515.3 80 76.0 0.882 9.37 4.31 0.685 465.8 474.1 482.4 490.7 499.0 507.3 515.6 79 74.5 0.840 8.93 4.75 0.653 466.1 474.4 482.7 491.0 499.3 507.6 515.9 78 73.0 0.801 8.50 5.18 0.621 466.3 474.6 482.9 491.2 499.5 507.8 516.2 77 71.5 0.763 8.09 5.59 0.591 466.4 474.7 483.0 491.3 499.7 508.0 516.4 76 70.0 0.727 7.71 5.97 0.563 466.6 474.9 483.2 491.5 499.9 508.2 516.6 75 68.5 0.692 7.34 6.34 0.537 466.8 475.1 483.4 491.7 500.1 508.4 516.8 74 67.0 0.659 6.99 6.69 0.511 467.0 475.3 483.6 491.9 500.3 508.6 517.0 73 65.5 0.628 6.66 7.02 0.487 467.2 475.5 483.8 492.1 500.5 508.8 517.2 72 64.0 0.597 6.33 7.35 0.463 467.4 475.7 484.0 492.3 500.7 509.0 517.4 71 62.5 0.568 6.03 7.65 0.441 467.4 475.7 484.0 492.4 500.8 509.1 517.5 70 61.0 0.541 5.74 7.94 0.420 467.6 475.9 484.2 492.6 501.0 509.3 517.7 69 59.5 0.515 5.45 8.23 0.398 467.7 476.0 484.3 492.7 501.2 509.4 517.8 68 58.0 0.489 5.18 8.50 0.378 467.9 476.2 484.5 492.9 501.3 509.6 518.0 67 56.5 0.465 4.93 8.75 0.359 468.1 476.4 484.7 493.1 501.5 509.8 518.2 66 55.0 0.442 4.69 8.99 0.342 468.2 476.5 484.8 493.2 501.6 509.9 518.3 65 53.5 0.421 4.47 9.21 0.326 468.3 476.6 484.9 493.3 501,7 510.0 518.4 64 52.0 0.400 4.25 9.43 0.310 468.4 476.7 485.1 493.4 501.8 510.1 518.5 63 50.5 0.380 4.04 9.64 0.295 468.6 476.9 485.3 493.6 502.0 510.3 518.7 62 49.0 0.361 3.83 9.85 0.280 468.7 477.1 485.4 493.7 502.1 510.4 518.8 61 47.5 0.343 3.62 10.06 0.265 468.8 477.2 485.5 493.8 502.2 510.5 518.9 B 135 32 PSYCHROMETRICAL TABLES. Reading of Ther- Temp Force Weight of Vapor T>*~ J Hu- Weight in Grains of a Cubic Foot of Air. mometer, Fahr. of Dew- of Vapor In a XWIJU* for midity, Satura- Height of the Barometer in English Inches. Point in Cubic Sat'n. tion = Fahr! English Inches. Foot of Air. ofaCu- bic Ft. of Air. 1.000. in. 28.0 in. 28.5 in. 29.0 in. 29.5 3O.O in. 3O.5 in. 31.0 Dry. Wet. 0 o o in. gr. gr gr. gr. gr. gr. gr. gr- gr. ; 89 89 89.0 1.326 14.08 0.00 1.000 462.4 470.6 478.9 487.1 495.4 5036 511.9 i 88 87.5 1.266 13.44 0.64 0.954 462.7 470.9 479.2 487.4 495.7 503.9 512.2 87 86.0 1.209 12.84 1.24 0.912 463.0 471.2 479.5 487.8 496.1 504.4 512.7 86 84.5 1.153 12.24 1.84 0.869 463.3 471.5 479.8 488.1 496.4 504.7 513.0 85 83.0 1.101 11.68 2.40 0.830 463.6 471.8 480.1 488.4 496.7 505.0 513.3 84 81.5 1.050 11.13 2.95 0.791 464.0 472.2 480.5 488.8 497.1 505.4 513.7 83 80.0 1.001 10.62 3.46 0.754 464.2 472.5 480.8 489.1 497.4 505.7 514.0 82 78.5 0.955 10.13 3.95 0.719 464.4 472.7 481.0 489.3 497.6 505.9 514.2 81 77.0 0.910 9.66 4.42 0.686 464.7 473.0 481.3 489.6 497.9 506.2 514.5 80 75.5 0.868 9.20 4.88 0.653 464.9 473.2 481.5 489.8 498.1 506.4 514.7 79 74.0 0.827 8.77 5.31 0.623 465.2 473.5 481.8 490.1 498.4 506.7 515.0 78 72.5 0.787 8.35 5.73 0.593 465.4 473.7 482.0 490.3 498.6 506.9 515.2 77 71.0 0.751 7.96 6.12 0.565 465.6 473.9 482.2 490.5 498.8 507.1 515.4 76 69.5 0.715 7.57 6.51 0.537 465.8 474.1 482.4 490.7 499.0 507.3 515.7 75 68.0 0.681 7.21 6.87 0.512 466.0 474.3 482.6 490.9 499.2 507.5 515.8 74 66.5 0.648 6.87 7.21 0.488 466.2 474.5 482.8 491.1 499.4 507.7 516.0 73 65.0 0.617 6.54 7.54 0.465 466.3 474.6 482.9 491.2 499.6 507.9 516.3 72 63.5 0.588 6.22 7.86 0.442 466.5 474.8 483.1 491.4 499.8 508.1 516.5 71 62.0 0.559 5.91 8.17 0.420 466.7 475.0 483.3 491.7 500.0 508.3 516.7 70 60.5 0.532 5.62 8.46 0.399 466.8 475.1 483.4 491.8 500.1 508.4 516.8 69 59.0 0.506 5.35 8.73 0.380 467.0 475.3 483.6 492.0 500.3 508.6 517.0 68 57.5 0.481 5.08 9.00 0.361 467.1 475.4 483.7 492.1 500.4 508.7 517.1 67 56.0 0.458 4.84 9.24 0.343 467.2 475.5 483.8 492.2 500.5 508.8 517.2 66 54.5 0.435 4.61 9.47 0.327 467.4 475.7 483.9 492.4 500.7 509.1 517.4 65 53.0 0.414 4.39 9.69 0.312 467.5 475.8 484.1 492.5 500.8 509.2 517.5 64 51.5 0.393 4.17 9.91 0.296 467.6 475.9 484.2 492.6 500.9 509.3 517.6 63 50.0 0.373 3.96 10.12 0.281 467.7 476.1 484.3 492.7 501.0 509.4 517.7 62 48.5 0.355 3.76 10.32 0.267 467.8 476.2 484.4 492.8 501.1 509.5 517.8 90 90 90.0 .368 14.50 0.00 1.000 461.3 469.5 477.8 486.0 494.3 502.5 510.8 89 88.5 .306 13.84 0.66 0.954 461.6 469.8 478.1 486.3 494.6 502.8 511.1 88 87.0 .247 13.22 1.28 0.910 462.0 470.2 478.5 486.7 495.0 503.2 511.5 87 85.5 .190 12.61 1.89 0.870 462.3 470.5 478.8 487.0 495.3 503.5 511.8 86 84.0 .136 12.03 2?47 0.830 462.7 470.9 479.2 487.4 495.7 503.9 512.1 85 82.5 .083 11.47 3.03 0.791 463.0 471.2 479.5 487.7 496.0 504.2 512.5 84 81.0 .034 10.94 3.56 0.755 463.2 471.5 479.8 488.0 496.3 504.5 512.8 83 79.5 0.986 10.43 4.07 0.719 463.4 471.7 480.0 488.2 496.5 504.7 513.0 82 78.0 0.940 9.95 4.55 0.686 463.7 472.0 480.3 488.5 496.8 505.0 513.3 81 76.5 0.896 9.48 5.02 0.653 464.0 472.3 480.6 488.8 497.1 505.3 513.6 80 75.0 0.854 9.03 5.47 0.622 464.2 472.5 480.7 488.9 497.3 505.5 513.9 79 73.5 0.814 8.61 5.89 0.594 464.3 472.6 480.9 489.1 497.5 505.7 514.1 78 72.0 0.776 8.20 6.30 0.565 464.5 472.8 481.1 489.3 497.7 505.9 514.3 77 70.5 0.739 7.80 6.70 0.538 464.7 473.0 481.3 489.5 497.9 506.1 514.5 B PSYCHROMETRICAL TABLES. 33 Reading of Ther- mometer. Fahr. Temp, of Dew- Point, Fahr. Force of Vapor English Inches. Weight of Vapor Hu- midity, Satura- tion = 1.000. Weight in Grains of a Cubic Foot of Air. In a Cubic Foot of Air. JMMU. for Sat'n. ofaCu- bic Ft. of Air. Height of the Barometer in English Inches. Dry. Wet. in. 28.0 in. 28.5 in. 29.O in. 29.5 in. 30.0 in. 30.5 in. 31.0 o 90 o 77 o 70.5 in. 0.739 gr- 7.80 «f- 6.70 0.538 gr. 464.7 gr. 473.0 gr- 481.3 gr- 489.5 gr- 497.9 gr- 506.1 gr- 514.5 76 69.0 0.704 7.43 7.07 0.512 465.0 473.3 481.6 489.8 498.2 506.4 514.8 75 67.5 0.670 7.08 7.42 0.488 465.2 473.5 481.8 490.0 498.4 506.6 515.0 74 66.0 0.638 6.74 7.76 0.465 465.4 473.7 482.0 490.2 498.6 506.8 515.2 73 64.5 0.607 6.42 8.08 0.443 465.6 473.9 482.2 490.4 498.8 507.0 515.4 72 63.0 0.578 6.10 8.40 0.421 465.7 474.0 482.3 490.5 498.9 507.1 515.5 71 61.5 0.550 5.81 8.69 0.400 465.9 474.2 482.5 490.7 499.1 507.3 515.7 70 60.0 0.523 5.52 8.98 0.381 466.1 474.4 482.8 491.0 499.3 507.5 515.9 69 58.5 0.498 5.25 9.25 0.362 466.2 474.5 482.9 491.1 499.4 507.6 516.0 68 57.0 0.473 4.99 9.51 0.344 466.4 474.7 483.1 491.3 499.6 507.8 516.2. 67 55.5 0.450 4.74 9.76 0.327 466.5 474.8 483.2 491.4 499.7 507.9 516.3 66 54.0 0.428 4.52 9.98 0.312 466.6 474.9 483.3 491.5 499.8 508.0- 516.4 65 52.5 0.407 4.30 10.20 0.297 466.7 475.0 483.4 491.6 499.9 508.1 516.5 64 51.0 0.386 4.09 10.41 0.282 466.9 475.2 483.6 491.8 500.1 508.3 516.6 63 49.5 0.367 3.90 10.60 0.269 467.0 475.3 483.7 491.9 500.2 508.4 516.7 B 137 TABLE XIII. FACTORS FOR COMPUTING THE FORCE OF VAPOR, FROM THE READINGS OF THE PSYCHROMETER, BY APJOHN^S FORMULA. DR. APJOHN'S formula for deducing the force of vapor, and the temperature of the dew-point, from the readings of the Psychrometer, as given in the Proceedings of the Royal Irish Academy for 1840, is f a — f i *_ x A J ,— / — 88 X 30' when the readings of the wet-bulb thermometer are above 32° Fahr., in which formula f" = the force of vapor at the temperature of the dew-point in degrees of Fahr., f = the force of vapor at the temperature of evaporation given by the wet-bulb thermometer, d = the difference between the readings of the dry and wet thermometers, h = the height of the barometer in English inches at the time of the observation. When the readings of the wet-bulb thermometer are below 32° Fahr., and the bulb is covered with ice, the formula becomes fll ft *_ *., A J — / "~96 x§o- The factors in the following table, which is taken from the Greenwich Observa- tions for 1843, represent ^ X ^ and ^ x ^, computed for all differences between the wet and dry bulb thermometers, or values of d, from 0° to 21°. USE OF THE TABLE. To find out the force of vapor in the air, and the temperature of the dew-point, by means of these factors, let the factor corresponding to d, or the difference between the wet and dry thermometer in the first column, be multiplied into the observed height of the barometer, and subtract the result from the force of vapor, in Table XI., due to the temperature of evaporation, indicated by the wet-bulb thermometer ; the rest is the force of vapor in the air at the time of the observation ; and the tem- *perature of the dew-point is that which is due to it in Table XI. EXAMPLE. The observation gives, Dry-bulb thermometer = 79° Fahr., or the temperature of the air. Wet-bulb " = 69° " or temperature of evaporation. Difference 10° Height of barometer 29.7 English inches. In the Table, 2d part, is found,— factor for a difference of 10° = 0.00379 X 29.7, or height of barometer = 0.113, which, subtracted from the force of vapor due to 69°, in Table XL, = 0.704 — 0.113, gives force of vapor in the air = 0.591 inches, and temperature of the dew-point 62°.5. When the temperature of the wet bulb is below 32° Fahrenheit, the factors in the first part of the Table must be used. B 138 XIII. FACTOR ^ X ^5, FOR COMPUTING THE FORCE OF VAPOR BY APJOHN's FORMULA yo ou Below 320 Fahrenheit ; the Wet Bulb covered with a Film of Ice. *,or Difference of Wet and Dry Bulb Therm. Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0 0 0.00000 0.00003 0.00007 0.00010 0.00014 0.00017 0.00020 0.00024 0.00027 0.00030 1 .00034 .00037 .00041 .00044 .00047 .00051 .00054 .00058 .00061 .00064 2 .00068 .00071 .00075 .00078 .00081 .00085 .00088 .00092 .00095, .00099 3 .00102 .00105 .00109 .00112 .00116 .00119 .00122 .00126 .00129 .00133 4 .00136 .00139 .00143 .00146 .00150 .00153 .00156 .00160 .00163 .00167 5 .00170 .00173 .00177 .00180 .00184 .00187 .00190 .00194 .00198 .00201 6 .00204 .00207 .00211 .00214 .00218 .00221 .00224 .00228 .00231 .00235 7 .00238 .00241 .00245 .00248 .00252 .00255 .00258 .00262 .00265 .00269 8 .00272 .00275 .00279 .00282 .00285 .00289 .00292 .00296 .00299 .00302 9 .00306 .00309 .00313 .00316 .00319 .00323 .00326 .00330 .00333 .00337 10 .00340 .00343 .00347 .00350 .00354 .00357 .00360 .00364 .00367 .00370 FACTOR 4 X *r. oo oU Reading of Wet-Bulb Thermometer above 32o Fahrenheit. d, or Difference of Wet and Dry Bulb Therm. Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. y. §. 9. 0 0 0.00000 0.00004 0.00008 0.00011 0.00015 0.00019 0.00023 0.00027 0.00030 0.00034 1 .00038 .00042 .00046 .00049 .00053 .00057 .00061 .00064 .00068 .00072 2 .00076 .00080 .00083 .00087 .00091 .00095 .00098 .00102 .00106 .00110 3 .00114 .00118 .00121 .00125 .00129 .00132 .00137 .00140 .00144 .00148 4 .00151 .00135 .00159 .00163 .00167 .00171 .00174 .00178 .00182 .00186 5 .00189 .00193 .00197 .00201 .00205 .00209 .00212 .00216 .00220 .00224 6 .00228 .00231 .00235 .00239 .00242 .00246 .00250 .00254 .00258 .00261 7 .00265 .00269 .00273 .00277 .00280 .00284 .00288 .00292 .00295 .00299 8 .00303 .00307 .00311 .00315 .00318 .00322 .00326 .00330 .00333 .00337 9 .00341 .00345 .00349 .00352 .00356 .00360 .00364 .00368 .00371 .00375 10 .00379 .00383 .00386 .00390 .00394 .00398 .00401 .00405 .00409 .00412 11 .00416 .00420 .00424 .00428 .00432 .00436 .00439 .00443 .00447 .00451 12 .00454 .00458 .00462 .00466 .00470 .00474 .00477 .00481 .00485 .00489 13 .00493 .00496 .00500 .00504 .00508 .00511 .00515 .00519 .00522 .00526 14 .00530 .00534 .00538 .00541 .00545 .00549 .00553 .00556 .00560 .00564 15 .00568 .00572 .00576 .00580 .00584 .00587 .00591 .00595 .00598 .00602 16 .00606 .00610 .00614 .00618 .00622 .00625 .00629 .00633 .00636 .00640 17 .00644 .00648 .00652 .00655 .00659 .00663 .00666 .00670 .00674 .00678 18 .00682 .00686 .00690 .00693 .00697 .00701 .00704 .00708 .00712 .00716 19 .00720 .00724 .00728 .00731 .00735 .00739 .00742 .00746 .00750 .00754 20 .00758 .00761 .00765 .00769 .00773 .00777 .00780 .00784 .00788 .00792 B 139 TABLE XIV. IN the Greenwich Magnetic and Meteorological Observations for 1842 and 1843, Mr. Glaisher discussed the relation between the temperature of evaporation given by the Wet-bulb Thermometer and the temperature of the Dew-Point as given by Dan- iell's Hygrometer. Comparing the observations taken simultaneously every six hours with the Psychrometer, and with DanielPs Dew-Point Hygrometer, and divid- ing the average difference between the temperatures of the Wet and Dry bulb by the average difference of the temperature of the Dew-Point and of the Air, he ob- tained the empirical factors given in the following Table. The observations from which they are deduced are those taken at the Observatory in the years 1841 to 1845, for the temperatures below 35° F., and in the years 1841 to 1843, for the temperatures above 35° F. The observations made at Toronto Observatory, Canada West, in similar circum- stances, in the years 1840 to 1842, were also compared in the same manner, and the factors derived from them showed a very close accordance for temperatures above 30° F., but were found smaller at temperatures below 30° F. The errors in the temperature of the Dew-Point, which may result by using the Greenwich factors, though frequently within half a degree, often amount, however, to ± 2 or 3 degrees, and, in extreme cases, to ± 4 or 5 degrees, as shown in the volume of the Greenwich Observations for 1842, p. 60 of the Abstracts. Use of the Table. Multiply the difference between the Wet-bulb and Dry-bulb Thermometers by the factor standing in the Table opposite the reading of the Dry-bulb, and subtract the product from the reading of the Dry-bulb ; the remainder will be the temperature of the Dew-Point. Example. — Dry-bulb = 62° F. ; Wet-bulb = 55° ; Difference = 7°. Opposite 62°, in the first column, stands the factor 1.7, which multiplied by 7°, the difference, gives 11°.9, to be subtracted from the Dry-bulb ; or 62° — 11°.9 — 50°. 1, temperature of the Dew-Point. XIV. FACTORS TO FIND OUT THE TEMPERATURE OF THE DEW-POINT FROM THE READINGS OF THE PSYCHROMETER. GLAISHER. Dry-Bulb Therm. Fahren. Factors. Dry-Bulb Therm. Fahren. Factors. Dry-Bulb Therm. Fahren. Factors. Dry-Bulb Therm. Fahren. Factors. Dry-Bulb Therm. Fahren. Factors. 21° 8.5 35° 2.6 49° 2.2 63° 1.7 77° .5 22 8.5 36 2.6 50 2.1 64 .7 78 .5 23 8.5 37 2.5 51 2.1 65 .7 79 .5 24 7.3 38 2.5 52 2.0 66 .6 80 .5 25 6.4 39 2.5 53 2.0 67 .6 81 .5 26 6.1 40 2.4 54 2.0 68 .6 82 .5 27 5.9 41 2.4 55 2.0 69 .5 83 .5 28 5.7 42 2.4 56 1.9 70 .5 84 .5 29 5.0 43 2.4 57 1.9 71 .5 85 .5 30 4.6 44 2.3 58 1.9 72 .5 86 .5 31 3.6 45 2.3 59 1.8 73 .5 87 .5 32 3.1 46 2.3 60 1.8 74 .5 88 .5 33 2.8 47 2.2 61 1.8 75 .5 89 .5 34 2.6 48 2.2 62 1.7 76 .5 90 .5 140 XV. WEIGHT OF VAPOR, IN GRAINS TROY, CONTAINED IN A CUBIC FOOT OF SATURATED AIR, AT TEMPERATURES BETWEEN 0° AND 94° FAHRENHEIT. From the Greenwich Observations. Temper- ature of Air, Fahren. Weight of Vapor, in Grains. Temper- ature of Air, Fahren. Weight of Vapor, in Grains. Temper- ature of Air, Fahren. Weight of Vapor, in Grains. Temper- ature of Air, Fahren. Weight of Vapor, in Grains. Temper- ature of Air, Fahren. Weight of Vapor, in Grains. 0° 0.78 19° .52 38° 2.89 57° 5.34 76° 9.60 1 0.81 20 .58 39 2.99 58 5.51 77 9.89 2 0.84 21 .63 40 3.09 59 5.69 78 10.19 3 0.87 22 .69 41 3.19 60 5.87 79 10.50 4 0.90 23 .75 42 3.30 61 6.06 80 10.81 5 0.93 24 .81 43 3.41 62 6.25 81 11.14 6 0.97 25 .87 44 3.52 63 6.45 82 11.47 7 .00 26 .93 45 3.64 64 6.65 83 11.82 8 .04 27 2.00 46 3.76 65 6.87 84 12.17 9 .07 28 2.07 47 3.88 66 7.08 85 12.53 10 .11 29 2.14 48 4.01 67 7.30 86 12.91 11 .15 30 2.21 49 4.14 68 7.53 87 13.29 12 1.19 31 2.29 50 4.28 69 7.76 88 13.68 13 1.24 32 2.37 51 4.42 70 8.00 89 14.08 14 1.28 33 2.45 52 4.56 71 8.25 90 14.50 15 1.32 34 2.53 53 4.71 72 8.50 91 14.91 16 1.37 35 2.62 54 4.86 73 8.76 92 15.33 17 1.41 36 2.71 55 5.02 74 9.04 93 15.76 18 1.47 37 2.80 56 5.18 75 9.31 94 16.22 XVI. FACTORS TO DEDUCE THE WEIGHT OF VAPOR CONTAINED IN A CUBIC FOOT OF AIR, AT THE TIME OF A GIVEN OBSERVATION, FROM THE INDICATIONS OF DEW-POINT INSTRUMENTS. GREENW. OfiS. t = Temperature of Air; f = Temperature of Dew-Point. Difference or t — t''. Factors. Difference or t — t". Factors. Difference or t — t". Factors. Difference or t — t". Factors. Difference or t — t". Factors. 1 0.999 9 0.982 17 0.966 25 0.951 33 0.935 2 0.996 10 0.980 18 0.964 26 0.949 34 0.934 3 0.994 11 0.978 19 0.962 27 0.947 35 0.932 4 0.992 12 0.976 20 0.960 28 0.945 36 0.930 5 0.990 13 0.974 21 0.958 29 0.943 37 0.929 6 0.988 14 0.972 22 0.956 30 0.942 38 0.927 7 0.986 15 0.970 23 0.954 31 0.939 39 0.925 8 0.984 16 0.968 24 0.952 32 0.937 40 0.923 USE OF TABLE XVI. — The difference between the temperatures of the air and of the Dew-Point being known, multiply the factor in the Table corre- sponding to that difference into the weight of a cubic foot of vapor at the temperature of the Dew-Point, as given in Table XV., and the product will be the weight of vapor in a cubic foot of air at the time of the observation. Example. — Temperature of air = 60° F. ; Dew-Point = 52° ; Diff. = 8°. Table gives for a difference of 8°, factor 0.984 ; Table XV. gives weight of a cubic foot of vapor at temperature 52° = 4.gr>56. Hence, 0.984 x 4.56 = 4§r>.49, the weight of vapor required. B 141 TABLE XVII. FOE COMPARING THE WEIGHT OF A CUBIC FOOT OF DRY AND OF SATURATED AIR. THIS table is composed of two tables found in the Greenwich Meteorological Observations for 1842, pages xlvi. and li. ; the first containing the weight of a cubic foot of dry air, under a barometric pressure of 30 inches, at temperatures be- tween 0° and 90° F. ; the other giving the weight of a cubic foot of saturated air under the same barometric pressure and temperature, together with the excess of the first above the last. The weight of a cubic foot of dry air, on which the tables are based, is assumed to be 563 grains Troy, being a mean value, in round numbers, between the determina- tions of Shuckburgh, which is 557.7295 grains, and that of Biot and Arago, 568.7013. iThe true mean is 563.2154, but 563 is the number used in the calculations. The coefficient of the expansion of the air is that of Gay-Lussac, viz. 0.00375 for 1° Centigrade, or 0.002083 of its bulk for 1° Fahrenheit. Use of the Table. This table shows the amount of buoyancy imparted to the air by the addition of moisture ; and from it, the temperature and the relative humidity of the air being known, the weight of a cubic foot of air, in the actual condition of the atmosphere at the time of an observation, can be deduced. It suffices to take in the fourth column, headed " Excess," the quantity corre- sponding to the temperature of the air in the first, multiply it into the given Relative Humidity, and subtract the product from the number in the second column. The result will be the weight of a cubic foot of air at the existing temperature and moisture, under a barometric pressure of 30 inches. This result will be reduced to its true value, under the barometric pressure given Height of Barometer by the observation, by multiplying it by - — ^ — Example. The temperature of the air is 60° F. ; the relative humidity, 0.852 ; the barom- eter reads 29 inches. The table gives, for temperature of air, 60° ; excess, 3.35 X 0.852 = 2.85, which, subtracted from 531.91 in the second column, = 529.12, weight of a cubic foot of air under 30 inches of pressure ; and 529.12 X ^p = 511.48, the weight of a cubic foot of air in the given conditions of temperature, moisture, and barometric pressure. B 142 XVII. FOR COMPARING THE WEIGHT OF A CUBIC FOOT OF DRY AND OF SATURATED AIR, From the Greenwich Observations. Temper- ature Fahren. Weight of a cubic foot of Dry Air. Weight of a cubic foot of Saturat- ed Air. Excess of Dry Air. Temper- ature Fahren Weight of a cubic foot of Dry Air. Weight of a cubic foot of Saturat- ed Air. Excess of Dry Air. Temper ature Fahren Weight of a cubic foot of Dry Air Weight of a cubic foot of Saturat- ed Air. Excess of Dry Air. 0 0 Grains. 603.21 Grains. 602.77 Grains 0.44 0 30 Grains. 565.35 Grains. 564.08 Grains. 1.27 o 60 Grains. 531.97 Grains. 528.62 Grains. 3.35 1 601.87 601.40 0.47 31 564.17 562.86 1.31 61 530.93 527.48 3.45 2 600.52 600.03 0.49 32 563.00 561.64 1.36 62 529.88 526.32 3.56 3 599.20 598.69 0.51 33 561.84 560.42 1.42 63 528.84 525.17 3.67 4 597.87 597.34 0.53 34 560.67 559.20 1.47 64 527.81 524.03 3.78' 5 596.55 596.01 0.54 35 559.51 558.01 1.50 65 526.88 522.90 3.88 6 595.24 594.69 0.55 36 558.35 556.79 1.56 66 525.76 521.75 4.01 7 593.94 593.36 0.58 37 557.21 555.61 1.60 67 524.75 520.61 4.14 8 5^2.63 592.04 0.59 38 556.05 554.40 1.65 68 523.72 519.46 4.26 9 591.33 590.72 0.61 39 554.91 553.20 1.71 69 522.70 518.29 4.41 10 590.04 589.40 0.64 40 553.77 552.00 1.77 70 521.70 517.17 4.53 11 583.75 588.07 0.68 41 552.65 550.80 1.84 71 520.70 516.02 4.68 12 537.43 586.78 0.70 42 551.52 549.63 1.89 72 519.69 514.87 4.82 13 586.21 585.49 0.72 43 550.39 548.44 1.95 73 518.70 513.75 4.95 14 584.94 584.18 0.75 44 549.27 547.26 2.01 74 517.70 512.61 5.09 15 533.67 582.89 0.78 45 548.16 546.06 2.10 75 516.71 511.46 5.25 16 532.41 581.61 0.80 46 547.05 544.88 2.17 76 515.73 510.32 5.41 17 531.15 580.33 0.82 47 545.97 543.75 2.22 77 514.74 509.18 5.56 18 579.91 579.06 0.85 48 544.85 542.55 2.30 78 513.77 508.04 5.73 19 573.67 577.79 0.88 49 543.75 541.36 2.39 79 512.80 506.91 5.89 20 577.44 576.54 0.90 50 542.65 540.21 2.44 80 511.82 505.74 6.08 21 576.21 575.27 0.94 51 541.55 539.04 2.51 81 510.87 504.61 6.26 22 574.93 574.01 0.97 52 540.48 537.87 2.61 82 509.89 503.45 6.44 23 573.76 572.76 l.QO 53 539.41 536.71 2.70 83 508.93 502.32 6.61 24 572.55 571.50 1.05 54 538.33 535.55 2.78 84 507.97 501.16 6.81 25 571.33 570.26 1.07 55 537.27 534.39 2.88 85 507.03 500.05 6.98 26 570.13 569.01 1.12 56 536.19 533.22 2.97 86 506.07 498.87 7.20 27 568.92 567.77 1.15 57 535.12 532.06 3.06 87 505.11 497.71 7.40 23 567.73 566.53 1.20 58 534.07 530.92 3.15 88 504.19 496.58 7.61 29 566.54 565.31 1.23 59 533.03 529.77 3.26 89 503.25 495.44 7.81 30 565.35 564.08 1.27 60 531.97 528.62 3.35 90 502.32 494.28 8.04 B 143 TABLE XIV. MR. Glaisher published in London, in 1856, another series of Hygrometrical Tables, which were unknown to the writer when the Second Edition of this volume was issued. They are based on Regnault's Table of Elastic Forces of Vapor, and on the coefficient of the expansion of the air as determined by the same physicist. The Psychro metrical Table, however, is not computed from Regnault's formula, but by first finding out, in the manner described on page 140, the temperatures of the dew- point from the readings of the Psychrometer, by means of the empirical factors given below, in Table XIV'., and then taking the corresponding values of the force of vapor from Regnault's table. These factors have been derived from the combination of all simultaneous observations of the dry and wet bulb thermometers with those of Daniell's hygrometer, taken at the Royal Observatory, Greenwich, from the year 1841 to 1854, with some observations taken at high temperatures in India, and others at low and medium temperatures at Toronto ; they are, therefore, more correct than those given in Table XIV. page 140. The results in this new Psychrometrical Table, nevertheless, by no means entirely coincide with those given by the formula, as a comparison with those in Table VII. will show. xiv'. FACTORS TO FIND OUT THE TEMPERATURE OF THE DEW-POINT FROM THE READINGS OF THE PSYCHROMETER. GLAISHER. Dry-Bulb Therm. Fahren. Factors. Dry-Bulb Therm. Fahren. Factors. Dry-Bulb Therm. Fahreu. Factors. Dry-Bulb Therm. Fahren. Factors. Dry-Bulb Therm. Fahren. Factors. 0 10 8.78 o 28 5.12 o 46 2.14 0 64 1.83 o 82 1.67 11 8.78 29 4.63 47 2.12 65 1.82 83 .67 12 8.78 30 4.15 48 2.10 66 3.81 84 .66 13 8.77 31 3.70 - 49 2.08 67 1.80 85 .65 14 8.76 32 3.32 50 2.06 68 1.79 86 .65 15 8.75 33 3.01 51 2.04 69 .78 87 .64 16 8.70 34 2.77 52 2.02 70 .77 88 .64 17 8.62 35 2.60 53 2.00 71 .76 89 .63 18 8.50 36 2.50 54 1.98 72 .75 90 .63 19 8.34 37 2.42 55 1.96 73 .74 91 .62 20 8.14 38 2.36 56 1.94 74 1.73 92 .62 21 7.88 39 2.32 57 1.92 75 1.72 93 .61 22 7.60 40 2.29 58 1.90 76 1.71 94 .60 23 7.28 41 2.26 59 1.89 77 1.70 95 .60 24 6.92 42 2.23 60 1.88 78 1.69 96 .59 25 6.53 43 2.20 61 1.87 79 1.69 97 1.59 26 6.08 44 2.18 62 1.86 80 1.68 98 1.58 27 5.61 45 2.16 63 1.85 81 1.68 99 1.58 28 5.12 46 2.14 64 1.83 82 1.67 100 1.57 B 144 MISCELLANEOUS TABLES, COMPARING- THE HYGROMETRICAL RESULTS OBTAINED BY DIFFERENT AUTHORITIES. B 145 MISCELLANEOUS TABLES. THE object of these Tables is to afford the means of comparing the different deter- minations of the hygrometrical elements which have been obtained, or adopted, by various physicists, especially the values of the elastic forces of vapor given in other tables than those contained in the preceding pages. Table XVIII., giving the elastic forces of vapor, expressed in millimetres of mer- cury, for Centigrade temperatures, was calculated by August from Dalton's experi- ments, and reduced to French measures in the translation of Kaemtz's Meteorology, by Chas. Martins, page 70, from which it has been taken. On these values are based the first psych rometrical tables published by August, in Berlin, 1825. Table XIX. is the table computed by Kaemtz from his own experiments. It is found, reduced to French measures, in the same volume, page 68. Table XX. furnishes the results of the experiments made by Professor Magnus, in Berlin, and published in PoggendorPs Annalen, Tom. LXI. p. 226, and also in the Annales de Chimie et de Physique, 3me serie, Tom. XII. p. 88, from which this table was copied. Table XXI. has been published by the Committee of Physics and Meteorology of the Royal Society, in their Report on the Objects of Scientific Inquiry in these Sciences, London, 1840, p. 89. The values which it contains are not derived from new experiments, but are probably computed from those existing at that time. Table XXII. furnishes a synoptic view of the differences in the values of the force of vapor adopted by various authorities, prepared with the view of facilitating their comparison. A reference to the.ir respective origin will be found below, page 152. Table XXIIL, showing the weight, in grammes, of the vapor contained in a cubic metre of saturated air, at different temperatures, is taken from Pouillet's Elements de Physique, Tom. II. p. 707. Table XXIV. gives the weights as derived from August's experiments, in Kaemtz's Vorlesungen uber Meteorologie. The table is copied from the French translation, by Martins, page 73. The tensions have been added, opposite the weights, and are extracted from August's table. Table XXV. is found in Biot's Traite de Physique, Tom. I. p. 533. B 147 XVIII. ELASTIC FORCE OF AQUEOUS VAPOR, EXPRESSED IN MILLIMETRES OF MERCURY FOR EVERY TENTH OF A CENTIGRADE DEGREE. CALCULATED BY AUGUST. Tenths of Degrees. Centigrade Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. o Millim. Millim. Minim. Millirn. Millim. Millim. Millim. Millim. Millim. Millim. -31 0.45 0.45 0.45 0.44 0.44 0.43 0.43 0.42 0.42 0.41 -30 0.50 0.49 0.49 0.48 0.48 0.47 0.47 0.46 0.46 0.45 -29 0.54 0.54 0.54 0.53 0.53 0.52 0.52 0.51 0.51 0.50 -28 0.59 0.58 0.58 0.57, 0.57 0.56 0.56 0.55 0.55 0.54 -27 0.63 0.63 0.63 0.62 0.62 0.61 0.61 0.60 0.60 0.59 -26 0.70 0.69 0.68 0.68 0.67 0.66 0.66 0.65 0.64 0.64 - -25 0.77 0.76 0.75 0.75 0.74 0.73 0.73 0.72 0.71 0.71 -24 0.83 0.83 0.82 0.82 0.81 0.80 0.80 0.79 0.78 0.78 -23 0.90 0.89 0.88 0.88 0.87 0.86 0.86 0.85 0.84 0.84 -22 0.99 0.98 0.97 0.96 0.95 0.95 0.94 0.93 0.92 0.91 -21 1.06 1.05 1.04 1.04 1.03 1.02 1.02 1.01 1.00 1.00 -20 1.15 1.14 1.13 1.12 1.11 1.11 1.10 1.09 1.08 1.07 -19 1.26 1.25 1.24 1.23 1.22 1.21 1.20 1.18 1.17 1.16 -18 1.33 1.32 1.31 1.31 1.30 1.29 1.29 1.28 1.27 1.27 -17 1.44 1.43 1.42 1.41 1.40 1.39 1.38 1.36 1.35 1.34 -16 1.56 1.54 1.53 1.52 1.51 1.50 1.49 1.47 1.46 1.45 -15 1.69 1.68 1.67 1.65 1.64 1.63 1.61 1.60 1.59 1.57 -14 1.80 1.79 1.78 1.77 1.76 1.75 1.74 1.72 1.71 1.70 -13 1.96 1.94 1.93 1.91 1.89 1.88 1.86 1.85 1.83 1.82 -12 2.12 2.10 2.09 2.07 2.05 2.04 2.02 2.01 1.99 1.98 -11 2.30 2.28 2.26 2.25 2.23 2.21 2.19 2.17 2.16 2.14 -10 2.48 2.46 2.44 2.43 2.41 2.39 2.37 2.35 2.34 2.32 — 9 2.66 2.64 2.62 2.61 2.59 2.57 2.55 2.53 2.52 2.50 - 8 2.86 2.84 2.82 2.80 2.78 2.76 2.74 2.72 2.70 2.68 — 7 3.09 3.06 3.04 3.02 3.00 2.97 2.95 2.93 2.91 2.88 - 6 3.32 3.29 3.27 3.25 3.23 3.20 3.18 3.16 3.14 3.11 — 5 3.56 3.56 3.54 3.51 3.48 3.46 3.43 3-40 3.37 3.35 — 4 3.83 3.80 3.78 3.75 3.72 3.70 3.67 3.64 3.61 3.59 - 3 4.11 4.07 4.05 4.02 3.99 3.97 3.94 3.91 3.88 3.86 - 2 4.40 4.37 4.34 4.32 4.29 4.26 4.23 4.20 4.17 4.14 - 1 4.71 4.68 4.65 4.62 4.59 4.56 4.53 4.49 4.46 4.43 - 0 5.05 5.01 4.98 4.95 4.91 4.88 4.85 4.81 4.78 4.74 + 0 5.05 5.09 5.12 5.16 5.19 5.23 5.27 5.30 5.34 5.37 O. 1. 2. 3. 4. 5. 6. 7. 8. 9. 148 ELASTIC FORCE OF AQUEOUS VAPOR. AUGUST. Cent! "rade Tenths of Degrees. Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. c 1 5.41 5.45 5.49 5.52 5.56 5.60 5.64 5.68 5.72 5.75 2 5.80 5.84 5,88 5.92 5.96 6.00 6.04 6.08 6.13 6.17 3 6.20 6.24 6.29 6.33 6.37 6.41 6.46 6.50 6.54 6.09 4 6.63 6.68 6.72 6.77 6.81 6.86 6.90 6.95 6.99 7.04 5 7.08 7.13 7.18 7.23 7.28 7.33 7.38 7.43 7.48 7.53 6 7.58 7.63 7.68 7.74 7.79 7.84 7.89 7.94 7.99 8.05 7 8.10 8.15 8.21 8.26 ' 8.32 8.37 8.43 8.48 8.53 8.59 8 8.64 8.70 8.76 8.82 8.87 8.93 8.99 9.05 9.11 9.17 9 9.23 9.30 9.36 9.43 9.50 9.57 9.63 9.70 9.77 9.84 10 9.90 9.96 10.02 10.08 10.14 10.20 10.25 10.31 10.37 10.43 11 10.49 10.56 10.63 10.69 10.76 10.83 10.90 10.96 11.03 11.10 12 11.17. 11.24 11.31 11.38 11.45 11-52 11.59 11.66 11.73 11.80 13 11.86 11.94 12.02 12.10 12.18 12.26 12.34 12.42 12.50 12.58 14 12.66 12.74 12.82 12.90 12.98 13.05 13.13 13.21 13.29 13.37 15 13.44 13.52 13.61 13.69 13.77 13.86 13.94 14.02 14.11 14.19 16 14.28 14.37 14.47 14.56 14.65 14.74 14.84 14.93 15.02 15.11 17 15.20 15.29 15.38 15.46 15.55 15.64 15.73 15.82 15.90 15.99 18 16.08 16.17 16.27 16.36 16.45 16.54 16.64 16.73 16.82 16.91 19 17.01 17.13 17.25 17.37 17.49 17.61 17.73 17.85 17.97 18.09 20 18.20 18.31 18.43 18.54 18.65 18.76 18.88 18.99 19.10 19.21 21 19.33 19.45 19.56 19.68 19.80 19.92 20.03 20.15 20.27 20.39 22 20.51 20.63 20.76 20.88 21.01 21.13 21.25 21.38 21.50 21.63 23 21.75 21.88 22.00 22.13 22.26 22.38 22.51 22.63 22.76 22.89 24 23.01 23.13 23.24 23.36 23.48 23.60 23.71 23.83 23.95 24.07 25 24.18 24.34 24.50 24.67 24.83 24.99 25.15 25.32 25.48 25.64 26 25.81 25.97 26.13 26.28 26.44 26.60 26.76 26.92 27.07 27.23 27 27.39 27.55 27.71 27.86 28.02 28.18 28.34 28.50 28.65 28-81 28 28.96 29.13 29.29 29.46 29.63 29.79 29.96 30.13 30.30 30.-16 29 30.63 30.81 30.98 31.16 31.33 31.51 31.69 31.86 32.04 32.21 30 32.39 32.57 32.76 32.94 33.13 33.31 33.50 33.68 33.87 34.05 31 34.24 34.43 34.63 34.82 35.02 35.21 35.40 35.60 35.79 35.99 32 36.18 36.38 36.59 36.79 36.99 37.20 37.40 37.60 37.80 38.01 33 38.21 38.43 38.64 38.86 39.08 39.29 89,51 39.73 39.94 40.16 34 40.38 40.60 40.82 41.04 41.26 41.49 41.71 41.93 42.15 42.37 35 42.59 42.82 43.05 43.28 43.51 43.74 43.97 44.20 44.43 44.66 0. 1. 2. 3. 4. 5. 6. y. §. 9. 149 XIX. ELASTIC FORCE OF AQUEOUS VAPOR, EXPRESSED IN MILLIMETRES OF MERCURY, FOR CENTIGRADE TEMPERATURES. BY KAEMTZ. Temper- ature Centi- Grade. Force of Vapor. Temper- ature Centi- grade. Force of Vapor. Temper- ature Centi- grade. Force of Vapor. Temper- ature Centi- grade. Force of Vapor. Temper- ature Centi- grade. Force of Vapor. o -25 Millim. 0.68 o -12 Millim. 1.92 o 0 Millim. 4.58 o 12 Millim. 10.24 0 24 Millim. 21.43 -24 0.72 -11 2.05 1 4.92 13 10.91 25 22.74 -23 0.79 -10 2.21 2 5.26 14 11.62 26 24.16 -22 0.86 - 9 2.39 3 5.64 15 12.38 27 25.56 -21 0.92 - 8 2.57 4 6.01 16 13.17 28 27.07 -20 1.01 _ 7 2.78 5 6.45 17 14.03 29 28.67 -19 1.10 - 6 2.98 6 6.90 18 14.93 30 30.36 -18 1.20 - 5 3.20 7 7.38 19 15.86 31 32.17 i -17 1.29 - 4 3.45 8 7.89 20 16.87 32 33.95 -16 1.40 - 3 3.70 9 8.41 21 17.91 33 35.95 -15 1.51 - 2 3.97 10 9.00 22 19.04 34 37.99 -14 1.62 - 1 • 4.26 11 9.58 23 20.21 35 40.15 -13 1.76 0 4.58 12 10.24 24 21.43 36 42.40 XX. ELASTIC FORCE OF AQUEOUS VAPOR, EXPRESSED IN MILLIMETRES OF MERCURY, FOR CENTIGRADE TEMPERATURES. BY MAGNUS. Temper- ature Centi- grade. Force of Vapor. Temper- ature Centi- grade. Force of Vapor. Temper- ature Centi- grade. Force of Vapor. Temper- ature Centi- grade. Force of Vapor. Temper- ature Centi- grade. Force of Vapor. o Millim. o Millim. o Millim. o Millim. o Millim. -20 0.916 -7 2.671 6 6.939 19 16.345 32 35.419 -19 0.999 -6 2.886 7 7.436 20 17.396 33 37.473 -18 .089 -5 3.115 8 7.964 21 18.505 34 39.630 -17 .186 -4 3.361 9 8.525 22 19.675 35 41.893 -16 .290 -3 3.624 10 9.126 23 20.909 36 44.268 -15 .103 <> 3.905 11 9.751 24 22.211 37 46.758 -14 .525 -1 4.205 12 10.421 25 23.582 38 49.368 -13 .655 0 4.525 13 11.130 26 25.026 39 52.103 -12 .796 +1 4.867 14 11.882 27 26.547 40 54.964 -11 1.947 2 5.231 15 12.677 28 28.148 41 57.969 -10 2.109 3 5.619 16 13.519 29 29.832 42 61.109 - 9 2.284 4 6.032 17 14.409 30 31.602 43 64.396 - 8 2.471 5 6.471 18 15.351 31 33.464 44 67.833 B 150 XXL ELASTIC FORCE OF AQUEOUS VAPOR, EXPRESSED IN ENGLISH INCHES OF MERCURY, FOR TEMPERATURES OF FAHRENHEIT. From the Royal Society's Report. Temperature of Air. Force of Vapor. Temperature of Air. Force of Vapor. Temperature of Air. Force of Vapor. Temperature of Air. Force of Vapor. Fahrenheit. Eng. Inches. Fahrenheit. Eng Inches. Fahrenheit. Eng. Inches. Fahrenheit. Eng. Inches. 0° 0.051 31° 0.179 62° 0.551 93° 1.514 1 0.053 32 0.186 63 0.570 94 1.562 2 0.056 33 0.193 64 0.590 95 1 610 3 0.058 34 0.200 65 0.611 96 1.660 4 0.060 35 0.208 66 0.632 97 1.712 5 0.063 36 0.216 37 0.654 98 1.764 6 0.066 37 0.224 68 0.676 99 1.819 7 0.069 38 0.233 69 0.699 100 1.874 8 0.071 39 0.242 70 0.723 101 1.931 9 0.074 40 0.251 71 0.748 102 1.990 10 0.078 41 0.260 72 0.773 103 2.050 11 0.081 42 0.270 73 0.799 104 2.112 12 0.084 43 0.280 74 0.826 105 2.176 13 0.088 44 0.291 75 0.854 106 2.241 14 0.092 45 0.302 76 0.882 107 2.307 15 0.095 46 0.313 77 0.911 108 2.376 16 0.099 47 0.324 78 0.942 109 2.447 17 0.103 48 0.336 79 0.973 110 2.519 18 0.107 49 0.349 80 1.005 111 2.593 19 0.112 50 0.361 81 1.036 112 2.669 20 0.116 51 0.375 82 1.072 113 2.747 21 0.121 52 0.389 83 1.106 114 2.826 22 0.126 53 0.402 84 1.142 115 2.908 23 0.131 54 0.417 85 1.179 116 2.992 24 0.136 55 0.432 86 1.217 117 3.078 25 0.142 56 0.447 87 1.256 118 3.166 26 0.147 57 0.463 88 1.296 119 3.257 27 0.153 58 0.480 89 1 .337 120 3.349 28 0.159 59 0.497 90 1.380 121 3.444 29 0.165 60 0.514 91 1.423 122 3.542 30 0.172 61 0.532 92 1.468 123 3.641 31 0.179 62 0.551 93 1.514 124 3.743 B 151 TABLE XXII. FOR SHOWING THE DIFFERENCES IN THE VALUES OF THE ELASTIC FORCE OF AQUEOUS VAPOR ADOPTED BY DIFFERENT AUTHORITIES. THE following synoptic view of the values of the elastic force of vapor adopted by various authorities, furnishes the means of readily comparing them, and of appreci- ating the amount of the differences which they exhibit. The values are given both in English and in French measures. Dal ton's values are copied from the Edinburgh Encyclopedia, Art. Hygrometry. Those adopted in the Greenwich Observations are found in the same article, and also • fn the volumes published annually by that Observatory. Biofs table of tensions is, V -/**v in fact, the same, computed by Pouillet from Dalton's results, by Biot's formula, and published in Biot's Traite de Physique, Tom. I. p. 531. Dr. Ure's results are taken from his Memoir in the Philosophical Transactions for 1818, p. 347. In the column headed " Daniell " are given the forces of vapor as found in the table published in his Meteorological Essays, 2d edition, p. 596, a table computed by Galbraith, from Dr. Ure's experiments, by the formula of Ivory. For the columns headed Royal Society, August, Kaemtz, Magnus, and Regnault, see above, p, 147. B 152 XXII. FOB SHOWING THE DIFFERENCES IN THE VALUES OF THE ELASTIC FORCE OF AQUEOUS VAPOR, ADOPTED BY DIFFERENT AUTHORITIES. FORCE OF VAPOR EXPRESSED IN ENGLISH INCHES FOR TEMPERATURES OF FAHRENHEIT. Temper- Force of Vapor according to Temper- of Air, Green- ature of Air, Fahren- heit. Dalton. wich Observa- Ure. Daniell. Royal Society. August. Kaemtz. Magnus. Regnault. Fahren- heit. tions. 0 Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. o 0 0.064 0.061 .... 0.068 0.051 0.053 0.048 0.044 0.043 0 10 0.090 0.089 .... 0.098 0.078 0.082 0.074 0.070 0.068 10 20 0.129 0.129 .... 0.140 0.116 0.124 0.112 0.108 0.108 20 30 0.186 0.186 .... 0.200 0.172 0.184 0.166 0.164 0.167 30 32 0.200 0.199 0.200 0.216 0.186 0.199 0.180 0.178 0.181 32 40 0.263 0.264 0.250 0.280 0.251 0.269 0.244 0.245 0.248 40 50 0.375 0.373 0.360 0.400 0.361 0.390 0.354 0.359 0.361 50 60 0.524 0.523 0.516 0.560 0.516 0.547 0.505 0.517 0.518 60 70 0.721 0.727 0.726 0.770 0.723 0.766 0.710 0.733 0.733 70 80 1.000 1.001 1.010 1.060 1.005 1.058 0.988 1.025 1.023 80 90 1.360 1.368 1.360 1.430 1.380 1.442 1.354 1.412 1.410 90 95 1.580 1.594 1.640 1.636 1.562 1.677 1.581 1.649 1.647 95 100 1.860 1.852 1.860 .... 1.874 1.921 1.918 100 I FORCE OF VAPOR EXPRESSED IN MILLIMETRES FOR CENTIGRADE TEMPERATURES. Temper- Force of Vapor according to Temper- of Air. Green- t ature i of Air, Centi- grade. Dalton. wich Observa- tions. Biot. Daniell. Royal Society. August. Kaemtz. Magnus. Regnault. Centi- grade. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. o —20 1 1 ^» 1 01 0 q i ft Q1 -15 1.93 1.88 1.88 2.11 1.60 1.69 1.51 1.40 1.38 -15 -10 2.64 2.62 2.63 2.92 2.34 2.48 2.21 2.11 2.08 -10 - 5 3.66 3.66 3.66 4.01 3.33 3.56 3.20 3.11 3.13 - 5 0 5.08 5.06 5.06 5.49 4.72 5.05 4.58 4.52 4.60 0 + 5 6.93 6.95 6.95 7.42 6.60 7.08 6.45 6.47 6.53 + 5 10 9.52 9.48 9.47 10.16 9.17 9.90 9.00 9.13 9.16 10 15 12.88 12.85 12.84 13.79 12.62 13.44 12.38 12.68 12.70 15 20 17.17 17.30 17.31 18.34 17.17 18.20 16.87 17.40 17.39 20 25 23.11 23.12 23.09 24.54 23.14 24.18 22.74 23.58 23.55 25 30 30.73 30.70 30.64 32.33 30.91 32.39 30.36 31.60 31.55 30 35 40.13 40.47 40.40 41.55 40.89 42.59 40.15 41.89 41.83 35 40 .... .... 53.00 .... 53.64 .... 54.96 54.91 40 B 153 XXIII. WEIGHT OF VAPOR, IN GRAMMES, CONTAINED IN A CUBIC METRE OF SATURATED AIR, AT TEMPERATURES BETWEEN 20° AND -[~40° CENTIGRADE. POUILLET. Temper- ature of Force of Weight of Temper- ature of Force of Weight of Temper- ature of Force of Weight of Dew-Point. Vapor. Vapor. Dew-Point. Vapor. Vapor. Dew-Point. Vapor. Vapor. Centigrade. Millim. Grammes. Centigrade. Millim. Grammes. Centigrade. Millim Grammes. -20° 1.3 1.5 11° 10.1 10.3 26° 24.4 23.8 -15 1.9 2.1 12 10.7 10.9 27 25.9 25.1 -10 2.6 2.9 13 11.4 11.6 28 27.4 26.4 - 5 3.7 4.0 14 12.1 12.2 29 29.0 27.9 0 5.0 5.4 15 12.8 13.0 30 30.6 29.4 + 1 5.4 5.7 16 13.6 13.7 31 32.4 31.0 2 5.7 6.1 17 14.5 14.5 32 34.3 32.6 3 6.1 6.5 18 15.4 15.3 33 36.2 34.3 4 6.5 6.9 19 16.3 16.2 34 38.3 36.2 5 6.9 7.3 20 17.3 17.1 35 40.4 38.1 6 7.4 7.7 21 18.3 18.1 36 42.7 40.2 7 7.9 8.2 22 19.4 19.1 37 45.0 42.2 8 8.4 8.7 23 20.6 20.2 38 47.6 44.4 9 8.9 9.2 24 21.8 21.3 39 50.1 46.7 10 9.5 9.7 25 23.1 22.5 40 53.0 49.2 XXIV. WEIGHT OF VAPOR, IN GRAMMES, CONTAINED IN A CUBIC METRE OF SATU- RATED AIR, AT TEMPERATURES BETWEEN 25° AND -f~36° CENTIGR. KAEMTZ. Temper- ature of Force of Weight Temper- ature of Force of Weight Temper- ature of Force of Weight of Dew-Point. Vapor. Vapor. Dew-Point. Vapor. Vapor. Dew-Point. Vapor. Vapor. Centigrade. Millim. Grammes. Centigrade. Millim. Grammes. Centigrade. • Millim. Grammes. -25° 0.77 0.93 -4° 3.83 4.37 16° 14.28 14.97 -24 0.83 1.01 -3 4.11 4.70 17 15.20 15.84 -23 0.90 1.10 -2 4.40 5.01 18 16.08 16.76 -22 0.99 1.19 -1 4.71 5.32 19 17.01 17.75 -21 1.06 1.26 0 5.05 5.66 20 18.20 18.77 -20 1.15 1.38 +1 5.41 6.00 21 19.33 19.82 -19 1.26 1.47 2 5.80 6.42 22 20.51 20.91 -18 1.33 1.60 3 6.20 6.84 23 21.75 22.09 -17 1.44 1.74 4 6.63 7.32 24 23.01 23.36 -16 1.56 1.84 5 7.08 7.77 25 24.18 24.61 -15 1.69 2.00 6 7.58 8.25 26 25.81 25.96 -14 1.80 2.14 7 8.10 8.79 26 27.39 27.34 -13 1.96 2.33 8 8.64 9.30 28 28.96 28.81 -12 2.12 2.48 9 9.23 9.86 29 30.63 30.35 -11 2.30 2.63 10 9.90 10.57 30 32.39 31.93 -10 2.48 2.87 11 10.49 11.18 31 34.24 33.65 - 9 2.66 3.08 12 11.17 11. S3 32 36.18 35.45 - 8 2.86 3.30 13 11.86 12.57 33 38.21 37.20 - 7 3.09 3.53 14 12.66 13.33 34 40.38 39.12 - 6 3.32 3.80 15 13.44 14.17 35 42.59 41.13 - 5 3.56 4.08 16 14.28 14.97 36 44.96 43.17 154 XXV. FORCES OF VAPOR AND RELATIVE HUMIDITY, CORRESPONDING TO THE DEGREES OF SAUSSURE's HAIR-HYGROMETER, AT THE TEMPERATURE OF 10° CENTIGRADE. From the Experiments of Gay-Lussac. The force of vapor is expressed in hundredths, the tension at full saturation being represented by 100. Degrees of Hair-Hy- grometer. Force of Vapor. Relative Humidity i.. Thou- sandths. Degrees of lliir-Hy- grometer. Force of Vapor. Relative Humility in Th >u- t>uiid.tiis. Degrees of Hair-Hy- grometer. Force of Vapor. Relative Humidity in Thou- sandths. o 0 0.00 0.000 0 34 17.10 o 67 43.73 1 0.45 35 17.68 0.177 68 44.89 2 0.90 86 18.30 69 46.04 3 1.35 37 18.92 70 47.19 0.472 4 1.80 38 19.54 71 48.51 5 2.25 0.022 39 20.16 72 49.82 0.500 6 2.71 40 20.78 0.208 73 51.14 7 3.18 41 21.45 74 52:45 8 3.64 42 22.12 75 53.76 0.538 9 4.10 43 22.79 76 55.25 10 4.57 0.046 44 23.46 77 56.74 11 5.05 45 24.13 0.241 78 58.24 12 5.52 46 24.86 79 59.73 13 6.00 47 25.59 80 61.22 0.612 14 6.48 48 26.32 81 62.89 15 6.96 0.070 49 27.06 82 64.57 16 7.46 50 27.79 0.278 83 66.24 17 7.95 51 28.58 84 67.92 18 8.45 52 29.38 85 69.59 0.696 19 8.95 53 30.17 86 71.49 20 9.45 0.094 54 30.97 87 73.39 21 9.97 55 31.76 0.318 88 75.29 22 10.19 56 32.66 89 77.19 23 11.01 57 33.57 90 79.09 0.791 24 11.53 58 34.47 91 81.09 25 12.05 0.120 59 35.37 92 88.08 26 12.59 60 36.28 0.363 93 85.08 27 13.14 61 37.31 94 87.07 28 13.69 62 35.34 95 89.06 0.891 29 14.23 63 39.36 96 91.25 30 14.78 0.148 64 40.39 97 93.44 31 15.36 65 41.42 0.414 98 95.63 32 15.94 66 42.58 99 97.81 33 16.52 67 43.73 100 100.00 1.000 B •155 XXVI. TABLE FOR DEDUCING THE RELATIVE HUMIDITY IN HUNDREDTHS, FROM THE INDICATIONS OF SAUSSURE'S HAIR-HYGROMETER ; Calculated from the Experiments of Melloni. » BY M. T. HAEGHENS. THE Hair-Hygrometer of Saussure having been formerly used for long series of observations, and being still employed by some meteorologists, notwithstanding the imperfection of this instrument, on account of its giving directly the relative humidity without calculation, it was desirable to ascertain the correspondence of the degrees of that hygrometer with the relative humidity expressed in hundredths, as in the preceding table. Though these instruments compared with each other, show very often great discrepancies in their indications, yet a large number of them agree sufficiently well with the experiments of Melloni, August, and others, to allow the following table of comparison to be constructed, which table may be considered as giving good approximations. For the calculation of it, Mr. Haeghens used the results of Melloni, which agree also satisfactorily with a series of observations very care- fully made by M. Delcros. See Annuaire Meteor ologique de la France, pour 1850. RELATIVE HUMIDITY IN HUNDREDTHS. Degrees of Saussure's Hy°Tome- Degrees of Saussure's Hygrometer. Units. ter. Tens. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. rlumidity Humidity Humidity Humidity Humidity Humidity Humidity Humidity Humidity Humidity O 0 0 1 1 2 3 3 4 4 5 1 5 6 6 7 8 8 9 10 11 11 2 12 12 13 14 15 16 17 18 ' 18 19 3 19 20 21 22 23 24 24 25 26 26 4 27 27 28 28 29 30 31 32 33 34 5 35 36 37 37 38 39 40 41 42 43 6 44 45 46 47 49 50 51 52 53 55 7 56 57 58 59 61 62 63 65 66 68 8 69 70 72 73 75 77 78 79 81 82 9 83 85 87 88 9t 91 93 95 97 98 10 100 • • • • • > • • • 156 TABLE XXVII. THE following Table shows the Relative Humidity, in hundredths, corresponding to the degrees of Saussure's Hair-Hygrometer, as determined by various physicists. It is found in Kaemtz, Vorlesungen uber Meteorologie, page 100 ; also in the French translation by Martins, Cours de Meteorologie, page 80. XXVI. RELATIVE HUMIDITY, CORRESPONDING TO THE DEGREES OF SAUSSURE'S HAIR-HYGROMETER. Saturation = 100. Degrees of Hair- Hygrometer. Relative Humidity according to Degrees of Hair- Hygrometer. Gay-Lussac. Prinsep. August. Melloni. 100° 100.0 100.0 100.0 100.0 100° 95 89.1 88.7 94.0 90.8 95 90 79.1 78.2 86.0 83.1 90 85 69.6 68.3 79.0 76.5 85 80 61.2 59.2 71.0 68.9 80 75 53.8 50.6 64.0 62.0 75 70 47.2 43.6 56.0 55.6 70 65 41.4 37.2 48.0 49.6 65 60 36.3 31.5 41.0 44.0 60 55 31.8 26.3 36.0 39.1 55 50 27.8 21.8 31.0 34.6 50 45 24.1 17.7 27.0 29.8 45 40 20.8 14.3 23.0 27.0 40 35 17.7 11.4 19.0 23.8 35 30 14.8 9.1 16.0 19.0 30 25 12.0 7.1 13.0 16.4 25 20 9.4 4.9 10.0 11.7 20 15 7.0 3.0 7.0 8.3 15 10 4.6 1.6 4.0 5.0 10 5 2.2 0.6 2.0 2.6 5 0 0.0 0.0 0.0 0.0 0 B 157 APPENDIX TO THE HYGEOMETRICAL TABLES. 159 TABLES FOR COMPARING THE QUANTITIES OF RAIN-WATER. THE three kinds of measures which are most in use for noting the quantities of rain and melted snow, are the Centimetres and Millimetres in France, the Paris or French inches and lines in Germany, and the English inches and decimals in Eng- land, America, and also in Russia, the Russian foot being the same as the English foot. The following tables wilt facilitate the comparison of these various measures with each other. A glance at the tables will show that the first column on the left contains the numbers to be converted, and the heads of the following columns the fractions of these numbers, or units, each of which is one tenth of those in the first column. Shorter tables, at the bottom, give, when necessary, the value of proportional parts still smaller than those found in the larger tables. Example. Let 13 Centimetres be converted into French inches and lines. Take, in Table II., the line beginning with 10 Centimetres in the first column, fol- low that line as far as the column headed 3 Centimetres, and there will be found the number of 4 inches 9.63 lines, which is the corresponding value in French inches of 10 + 3, or 13 Centimetres. If the number is followed by a fraction, as for instance, 13.5 Centimetres, or 135 Millimetres, we find, — French Inches. Lines. In the larger table 13 Centimetres = 4 .9,63 In the smaller table at the bottom 5 Millimetres = .2,216 Or 13.5 Centimetres = 4.11,846 When the measures which are to be compared are both subdivided into decimal parts, the equivalents of the numbers greater than 9.9 may be found by moving the decimal point. Example. Let 346.7 Centimetres be converted into English inches. In Table I., in the column headed 4, on the fourth line, we find 3.4 Centimetres = 1.3386 English inches. Moving the decimal point by two places we have 340 Centimetres = 133.86 English inches. Then, in the column headed 7, on the line beginning with 6, we find 6.7 Centimetres = 2.64 Making together 346.7 Centimetres = 136.50 English inches. B 161 I. CONVERSION OF CENTIMETRES INTO ENGLISH INCHES AND DECIMALS. 1 Centimetre = 0.3937079 English Inch. Millimetres. metres. O. 1. 2. 3. 4. 5. 6. •7. 8. 9. Eng.Inch. Eng.Inch. Eng.Inch . Eng.Inch . Eng.Inch Eng.Inch. Eng.Inch. Eng.Inch. Eng.Inch Eng.Inch. 0 I 0.0000 0.0394 0.0787 0.1181 0.1575 0.1969 0.2362 0.2756 0.3150 0.3543 1 0.3937 0.4331 0.4724 0.5118 0.5512 0.5906 0.6299 0.6693 0.7087 0.7480 2 0.7874 0.8268 0.8662 0.9055 0.9449 0.9843 1.0236 1.0630 1.1024 1.1418 3 1.1811 1.2205 1.2599 1.2992 1.3386 1.3780 1.4173 1.4567 1.4961 1.5355 4 1.5748 1.6142 1.6536 1.6929 1.7323 1.7717 1.8111 1.8504 1.8898 1.9292 5 1.9685 2.0079 2.0473 2.0867 2.1260 2.1654 2.2048 2.2441 2.2835 2.3229 6 2.3622 2.4016 2.4410 2.4804 2.5197 2.5591 2-5985 2.6378 2.6772 2.7166 7 2.7560 2.7953 2.8347 2.8741 2.9134 2.9528 2.9922 3.0316 3.0709 3.1103 8 3.1497 3.1890 3.2284 3.2678 3.3071 3.3465 3.3859 3.4253 3.4646 3.5040 9 3.5434 3.5827 3.6221 3.6615 3.7009 3.7402 3.7796 3.8190 3.8583 3.8977 II. CONVERSION OF CENTIMETRES INTO FRENCH INCHES, LINES, AND DECIMALS. 1 Centimetre = 0. inches 4.43296 Paris lines. Units. Centi- metres. O. 1. 2. 3. 4. 5. 6. 7. §. 9. I Yin. Lin. Fr.In. Lin. Fr.In. Lin. I Yin. Lin. Fr.In. Lin. Fr.In. Lin. iFr.In. Lin. Fr.In. Lin. Fr.In. Lin. Fr.In. Lin. 0 0. 0,00 0. 4,43 0. 8,87 1. 1,30 1. 5,73 1.10,16 2. 2,60 2. 7,03 2.11,46 3. 3,90 10 3. 8,33 4. 0,76 4. 5,20 4. 9,63 5. 2,06 5. 6,49 5.10,93 6. 3,36 6. 7,79 7. 0,23 20 7. 4,66 7. 9,09 8. 1,53 8. 5,96 8.10,39 9. 2,82 9. 7,26 9.11,69 10. 4,12 10. 8,56 30 1. 0,99 11. 5,42 11. 9,851 2. 2,29 1 L2. 6,72 12.11,15 13. 3,59 13. 8,02 14. 0,45 14. 4,89 40 4. 9,32 15. 1,75 15. 6,181 5.10,62 1 L6. 3,05 L6. 7,48 16.11,9217. 4,35 17. 8,78 18. 1,22 50 8. 5,65 18.10,08 19. 2,51 ] 9. 6,951 19.11,38 JO. 3,81 ! 20. 8,25 21. 0,68 21. 5,11 21. 9,54 60 2. 1,98 22. 6,41 22.10,84 5 3. 3,285 53. 7,71 !4. 0,14' 24. 4,58J24. 9,01 25. 1,44 25. 5,87 70 5.10,31 26. 2,74 26. 7,172 6.11,61 e. »7. 4,04 57. 8,47 J >8. 0,90128. 5,34 28. 9,77 29. 2,20 80 9. 6,64 29.11,07 30. 3,502 0. 7,93 I Jl. 0,37 Jl. 4,8031. 9,2332. 1,67 32. 6,10 32.10,53 90 3. 2,97 33. 7,40 33.11,83? 4. 4,26 34. 8,70 J5. 1,1335. 5,5635.10,00 36. 2,43 36. 6,86 1 Centim. Yin. LinJ Centim. F r.In.Lin. Centim. Yin. Lin.l| Centim. ] Y.In. Lin. Centim. Fr.In. Lin. II i°° 36.11,30 200 7 3.10.59 300 !110.9,89]| 400 ] 147.9,18 500 184.8,48 CONVERSION OF CENTIMETRES INTO FRENCH LINES AND DECIMALS. Units. Centi- metres. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Fr. Lines. Fr. Lines. Fr. Lines: Fr. Lines. Fr. Lines. Fr. Lines. Fr. Lines. Fr. Lines. Fr. Lines. Fr. Lines. 0 0.00 4.43 8.87 13.30 17.73 22.16 26.60 31.03 35.46 39.90 10 44.33 48.76 53.20 57.63 62.06 66.49 7093 75.36 79.79 84.23 20 88.66 93.09 97.53 101.96 106.39 110.82 115.26 119.69 124.12 128.56 30 132.99 137.42 141.85 146.29 150.72 155.15 159.59 164.02 168.45 172.89 40 177-32 181.75 186.18 190.62 195.05 199.48 203.92 208.35 212.78 217.22 50 221.65 226.08 230.51 234.95 239.38 243.81 248.25 252.68 257.11 261.54 60 265.98 270.41 274.84 279.28 283.71 288.14 292.58 297.01 301.44 305.87 70 310.31 314.74 319.17 323.61 328.04 332.47 336.90 341.34 345.77 350.20 80 354.64 359.07 363.50 367.93 372.37 376.80 381.23 385.67 390.10 394.53 90 398.97 403.40 407.83 412.26 416.70 421.13 425.56 430.00 434.43 438.86 CONVERSION OF MILLIMETRES INTO FRENCH LINES AND DECIMALS. j o. 1. 2. 3. 4. ff. 6. 7. 8. 9. Fr. Lines. Fr. Lines. Fr. Lines. Fr. Lines. Fr. Lines Fr. Lines. Fr. Lines. Fr. Lines. Fr. Lines. Fr. Lines. 0.0 0.443 0.887 1.330 1.773 2.216 2.660 3.103 3.546 3.990 162 III. CONVERSION OF ENGLISH INCHES INTO CENTIMETRES. 1 English Inch = 2.53995 Centimetres. Units. English Inches. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Centim. Centim. Centim. Centim. Centim. Centim. Centim. Centim. Centim. Centim. 0 0.00 2.54 5.08 7.62 10.16 12.70 15.24 17.78 20.32 22.86 10 25.40 27.94 30.48 33.02 35.56 38.10 40.64 43.18 45.72 48.26 20 50.80 53.34 55.88 58.42 60.96 63.50 66.04 68.58 71.12 73.66 30 76.20 78.74 81.28 83.82 86.36 88.90 91.44 93.98 96.52 99.06 40 101.60 104.14 106.68 109.22 111.76 114.30 116.84 119.38 121.92 124.46 50 127.00 129.54 132.08 134.62 137.16 139.70 142.24 144.78 147.32 149.86 60 152.40 154.94 157.48 160.02 162.56 165.10 167.64 170.18 172.72 175.26 70 177.80 180.34 182.88 185.42 187.96 190.50 193.04 195.58 198.12 200.66 80 203.20 205.74 208.28 210.82 213.36 215.90 218.44 220.98 223.52 226.06 90 228.60 231.14 233.68 236.22 238.76 241.30 243.84 246.38 248.92 251.46 100 254.00 256.54 259.08 261.62 264.16 266.70 269.24 271.78 274.32 276.85 110 279.39 281.93 284.47 287.01 289.55 292.09 294.63 297.17 299.71 302.25 120 304.79 307.33 309.87 312.41 314.95 317.49 320.03 322.57 325.11 327.65 130 330.19 332.73 335.27 337.81 340.35 342.89 345.43 347.97 350.51 353.05 140 355.59 358.13 360.67 363.21 365.75 368.29 370.83 373.37 375.91 378.45 150 380.99 383.53 386.07 388.61 391.15 393.69 396.23 398.77 401.31 403.85 160 406.39 408.93 411.47 414.01 416.55 419.09 421.63 424.17 426.71 429.25 170 431.79 434.33 436.87 439.41 441.95 444.49 447-03 449.57 452.11 454.65 180 457.19 459.73 462.27 464.81 467.35 469.89 472.43 474.97 477.51 480.05 190 482-59 485.13 487.67 490.21 492.75 495.29 497.83 500.37 502.91 505.45 200 507.99 510.53 513.07 515.61 518.15 520.69 523.23 525.77 528.31 530.85 Tenths of an Inch. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Centim. Centim. Centim. Centim. Centim. Centim. Centim. Centim. Centim. Centim. 0.000 0.254 0.508 0.762 1.016 1.270 1.524 1.778 2.032 2.286 IV. CONVERSION OF ENGLISH INCHES INTO FRENCH INCHES AND LINES. 1 English Inch = 0. inches 11.2595 Paris lines. • Units. Eng Inches. O. 1. 2. 3. 4. 5. 6. 7. 8. 9. Fr.In.Lin. Fr.In.Lin. Fr.In.Lin. Fr.In.Lin. I Yin. Lin. Yin. Lin. Fr.In. Lin. Fr.In. Lin. Fr.In. Lin. Fr.In. Lin. 0 0. 0,00] 0.11,26 1.10,52 2. 9,78 3. 9,04 4. 8,30 5. 7,56 6. 6,82 7. 6,08 8. 5,34 10 9. 4,59 10. 3,85 11. 3,11 12. 2,371 L3. 1,63 14. 0,89 15. 0,15 15.11,41 16.10,67 17. 9,93 20 18. 9,19 19. 8,4520. 7,71 21. 6,975 52. 6,23 53. 5,49 24. 4,75 25. 4,01 26. 3,27 27. 2,53 30 28. 1,78 29. 1,0430. 0,30 30. 11, 56 c 11. 10,82 52.10,08 J3. 9,34 34. 8,60 35. 7,86 36. 7,12 40 37. 6,38 38. 5,6439. 4,90 40. 4,16^ H. 3,42 12. 2,68 43. 1,94 44. 1,20 45. 0,46 45.11,72 50 46.10,97 47.10,2348. 9,49 49. 8,75 t >0. 8,01 >1. 7,27 52. 6,53 53. 5,79 54. 5,05 55. 4,31 60 56. 3,57 57. 2,8358. 2,09 59. 1,35 € 0. 0,61 10.11,8761.11,13 62.10,39 53. 9,65 54. 8,91 70 65. 8,1666. 7,4267. 6,68 68. 5,94 € 9. 5,20 rO. 4,4671. 3,72 72. 2,98 73. 2,24 74. 1,50 80 75. 0,7676. 0,0276.11,28 77.10,54 1 8. 9,80 r9. 9,0680. 8,32 31. 7,58 32. 6,84 33. 6,10 90 84. 5,35<85. 4,6186. 3,87 87. 3,1388. 2,39 9. 1,6590. 0,91 91. 0,17 n. 11,43 92.10,69 Eng. Inch. Fr.In. Lin. llEng.Inch. Fr.In.Lin. ] Sng.Inch. Yin. Lin. Eng. Inch. Fr.In. Lin. Eng.Inch. Fr.In. Lin. 100 93.9,95 I) 200 187.7,90 300 281.5,85 400 875.3,80 500 469.1,75 Tenths of an Inch. 0. 1. 2. 3. 4. 5. 6. 7. 8. | 9. Fr.In.Lin. Fr.In.Lin. Fr.tn. Lin. Fr.In.Lin. F r.In. Lin. 5 Yin. Lin. I Yin. Lin. Yin. Lin. 1 Yin. Lin. Fr.In. Lin. 0.0,00 0.1,13 0.2,25 0.3,38 0.4,50 0.5,63 0.6,76 0.7,88 0.9,01 0.10,13 163 V. CONVERSION OF FRENCH INCHES INTO CENTIMETRES. 1 French Inch = 2.7070 Centimetres. French Unita. Inches. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Ceutim. Centim. Centim. Centim. Centim. Centim. Centim. Centim. Centim. Centim. 0 0.00 2.71 5.41 8.12 10.83 13.53 16.24 18.95 21.66 24.36 10 27.07 29.78 32.48 35.19 37.90 40.60 43.31 46.02 48.73 51.43 20 54.14 56.85 59.55 62.26 64.97 67.67 70.38 73.09 75.80 78.50 30 81.21 83.92 86.62 89.33 92.04 94.74 97.45 100.16 102.87 105.57 40 108.28 110.99 113.69 116.40 119.11 121.81 124.52 127.23 129.94 132.64 50 135.35 138.06 140.76 143.47 146.18 148.88 151.59 154.30 157.01 159.71 60 162.42 165.13 167.83 170.54 172.25 175.95 178.66 181.37 184.08 186.78 70 189.49 192.20 194.90 197.61 200.32 203.02 205.73 208.44 211.15 213.85 80 216.56 219.27 221.97 224.68 227.39 230.09 232.80 235.51 238.22 240.92 90 243.63 246.34 249.04 251.75 254.46 257.16 259.87 262.58 265.29 267.99 100 270.70 273.41 276.11 278.82 281.53 284.23 286.94 289.65 292.36 295.06 110 297.77 300.48 303.18 305.89 308.60 311.30 314.01 316.72 319.42 322.13 120 324.84 327.55 330.25 332.96 335.67 338.37 341.08 343.79 346.49 349.20 130 351.91 354.62 357.32 360.03 362.74 365.44 368.15 370.86 373.56 376.27 140 378.98 381.69 384.39 387.10 389.81 392.51 395.22 397.93 400.63 403.34 150 406.05 408.76 411.46 414.17 416.88 419.58 422.29 425.00 427.70 430.41 160 433.12 435.83 438.53 441.24 443.95 446.65 449.36 452.07 454.77 457.48 170 460.19 462.90 465.60 468.31 471.02 473.72 476.43 479.14 481-84 484.55 180 487.26 489.97 492.67 495.38 498.09 500.79 503.50 506.21 508.91 511.62 190 514.33 517.04 519.74 522.45 525.16 527.86 530.57 533.28 535.98 538.69 200 541.40 544.11 546.81 549.52 552.23 554.93 557.64 560.35 563.05 565.76 CONVERSION OF FRENCH LINES INTO CENTIMETRES. 1 French Line = 0.22558 Centimetre. Tenths of a Line. French Lines. 0. 1. 2. 3. 4. 5. 6. 7. §. 9. Centim. Centim. Centim. Centim. Centim. Centim. Centim. Centim. Centim. Centim. 0 0.000 0.023 0.045 0.068 0.090 0.113 0.135 0.158 0.180 0.203 1 0.226 0.248 0.271 0.293 0.316 0.338 0.361 0.383 0.406 0.429 2 0.451 0.474 0.496 0.519 0.541 0.564 0.587 0.609 0.632 0.654 3 0.677 0.699 0.722 0.744 0.767 0.790 0.812 0.835 0.857 0.880 4 0.902 0.925 0.947 0.970 0.993 1.015 1.038 1.060 1.083 1.105 5 1.128 1.150 1.173 1.196 1.218 1.241 1.263 1.286 1.308 1.331 6 1.353 1.376 1.399 1.421 1.444 1.466 1.489 1.511 1.534 1.557 •7 1.579 1.602 1.624 1.647 1.669 1.692 1.714 1.737 1.760 1.782 8 1.805 1.827 1.850 1.872 1.895 1.917 1.940 1.963 1.985 2.008 9 2.030 2.053 2.075 2.098 2.120 2.143 2.166 2.188 2.211 2.233 10 2.256 2.278 2.301 2.324 2.346 2.369 2.391 2.414 2.436 2.459 11 2.481 2.504 2.527 2.549 2.572 2.594 2.617 2.639 2.662 2.684 12 2.707 2.730 2.752 2.775 2.797 2.820 2.842 2.865 2.887 2.910 164 VI. CONVERSION OF FRENCH INCHES INTO ENGLISH INCHES AND DECIMALS. 1 French Inch = 1.065765 English Inch. Units. French Inches. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Eng.Inch. Eng.Inch. Eng.Inch. Eng.Inch. Eng.Inch. Eng.Inch. Eng.Inch. Eng.Inch. Eng.Inch. Eng.Inch. 0 0.000 1.066 2.132 3.197 4.263 5.329 6.395 7.460 8.526 9.592 10 10.658 11.723 12.789 13.855 14.921 15.986 17.052 18.118 19.184 20.250 20 21.315 22.381 23.447 24.513 25.578 26.644 27.710 28.776 29.841 30.907 30 31.973 33.039 34.104 35.170 36.236 37.302 38.368 39.433 40.499 41.565 40 42.631 43.696 44.762 45.828 46.894 47.959 49.025 50.091 51.157 52.222 50 53.288 54.354 55.420 56.486 57.551 58.617 59.683 60.749 61.814 62.880 60 63.946 65.012 66.077 67.143 68.209 69.275 70.340 71.407 72.472 73.538 70 74.604 75.669 76.735 77.801 78.867 79.932 80.998 82.064 83.130 84.195 80 85.261 86.327 87.393 88.458 89.524 90.590 91.656 92.722 93.787 94.853 90 95.919 96.985 98.050 99.116 100.182 101.248 102.314 103.379 104.445 105.511 100 106.576 107.642 108.708 109.774 110.840 111.905 112.971 114.037 115.103 116.168 110 117.234 118.300 119.366 120.431 121.497 122.563 123.629 124.695 125.760 126.826 120 127.892 128.958 130.023 131.089 132.155 133.221 134.286 135.352 136.418 137.484 130 138.549 139.615 140.681 141.747 142.813 143.878 144.944 146.010 147.076 148.141 140 149.207 150.273 151.339 152.404 153.470 154.536 155.602 156.667 157.733 158.799 150 159.865 160.931 161.996 163.062 164.128 165.194 166.259 167.325 168.391 169.457 160 170.522 171.588 172.654 173.720 174.785 175.851 176.917 177.983 179.049 180.114 170 181.180 182.246 183.312 184.377 185.443 186.509 187.575 188.640 189.706 190.772 180 191.838 192.903 193.969 195.035 196.101 197.167 198.232 199.298 200.364 201.430 190 1202.495 203.561 204.627 205.693 206.758 207.824 208.890 209.956 211.021 212.087 200 213.153214.219 11 215.285 216.350 217.416 218.482 219.548 220.613 221.679 222.745 CONVERSION OF FRENCH LINES INTO ENGLISH INCHES. 1 French Line = 0.088814 English Inch. Tenths of a Line. French Lines. o. 1. 2. 3. 4. 5. 6. *' 8. 9. Eng.Inch. Eng.Inch. Eng.Inch. Eng.Inch. Eng.Inch. Eng.Inch. Eng.Inch. Eng.Inch. Eng.Inch. Eng.Inch. 0 0.0000 0.0089 0.0178 0.0266 0.0355 0.0444 0.0533 0.0622 0.0711 0.0799 1 0.0888 0.0977 0.1066 0.1155 0.1243 0.1332 0.1421 0.1510 0.1599 0.1687 2 0.1776 0.1865 0.1954 0.2043 0.2132 0.2220 0.2309 0.2398 0.2487 0.2576 3 0.2664 0.2753 0.2842 0.2931 0.3020 0.3108 0.3197 0.3286 0.3375 0.3464 4 0.3553 0.3641 0.3730 0.3819 0.3908 0.3997 0.4085 0.4174 0.4263 0.4352 5 0.4441 0.4530 0.4618 0.4707 0-4796 0.4885 0.4974 0.5062 0.5151 0.5240 6 0.5329 0.5418 0.5506 0.5595 0.5684 0.5773 0.5862 0.5951 0.6039 0.6128 7 0.6217 0.6306 0.6395 0.6483 0.6572 0.6661 0.6750 0.6839 0.6927 0.7016 8 0.7105 0.7194 0.7283 0.7372 0.7460 0.7549 0.7638 0.7727 0.7816 0.7904 9 0.7993 0.8082 0.8171 0.8260 0.8349 0.8437 0.8526 0.8615 0.8704 0.8793 10 0.8881 0.8970 0.9059 0.9148 0.9237 0.9325 0.9414 0.9503 0.9592 0.9681 11 0.9770 0.9858 0.9947 1.0036 1.0125 1.0214 1.0302 1.0391 1.0480 1.0569 12 1.0658 1 .0746 1.0835 1.0924 1.1013 1.1102 1.1191 1.1279 1.1368 1.1457 B 165 METEOROLOGICAL TABLES III. BAROMETRICAL TABLES CONTENTS. TABLE I. II. III. " IV. V. VI. VII. VIII. IX. X. XI. XII. XIII. XIV. XV. XVI. " XVII. " XVIII. " XIX. " XX. " XXI. " XXII. " XXIII. " XXIV. " XXV. " XXVI. 44 XXVII. 14 XXVIII. (The figures refer to the folio at the bottom of the page.) For Comparing the different Barometrical Scales. Comparison of the English and the Metrical Barometers . .11 Comparison of the English and the Old French Barometers . 15 Comparison of the Metrical and the English Barometers . .21 Comparison of the Metrical and the Old French Barometers . 27 Comparison of the Old French and the English Barometers . 35 Comparison of the Old French and the Metrical Barometers . 39 Comparison of the Russian and the Metrical Barometers . . 46 Comparison of the Russian and the Old French Barometers . 48 For Comparing Barometrical Differences. Conversion of English Inches into Millimetres . . . .53 Conversion of English Inches into French or Paris Lines . 53 Conversion of Millimetres into English Inches . I/ . . 54 Conversion of Millimetres into French or Paris Lines . . 55 Conversion of French or Paris Lines into Millimetres . . . 56 Conversion of French or Paris Lines into English Inches . 56 Conversion of Russian Half-Lines into Millimetres . . .57 Conversion of Russian Half-Lines into Paris Lines ' . . 57 For Reducing Barometrical Observations to the Freezing Point. Reduction of English Barometers with Brass Scales . . .65 Reduction of English Barometers with Glass, or Wooden Scales 72 Reduction of the Metrical Barometer, by Delcros . . .73 Reduction of the Metrical Barometer, by Haeghens . . 81 Reduction of the Old French Barometer, by Kaemtz . . . 124 For Correcting Barometrical Observations for Capillary Action. Correction to be applied to English Barometers for Capillary Action 131 Normal Height of Meniscus in Millimetres, by Delcros . . 131 Correction to be applied to Metrical Barometers for Capillary Action, by Delcros 132 Depression of the Barometrical Column due to Capillary Action. — Pouillet 133 Depression of the Barometrical Column due to Capillary Action. — Gehler's Worterb 133 Depression of the Barometrical Column due to Capillary Action, reduced from Delcros's Table ...... 134 Depression of the Barometrical Column due to Capillary Action. — Baily 134 3 COMPARISON OF THE BAROMETRICAL SCALES, OR TABLES FOR CONVERTING THE INDICATIONS OF THE ENGLISH, METRICAL, OLD FRENCH, AND RUSSIAN BAROMETERS INTO EACH OTHER. COMPARISON THE BAROMETRICAL SCALES. THE following tables are intended for converting into each other the four most important Barometrical Scales. They are sufficiently detailed to save the labor of any calculation or even of interpolation for the ordinary wants of Meteorology. But before making use of them, for comparing the observations taken with barometers of different scales, it is necessary to reduce the observed heights to the temperature of the freezing point, or to any other temperature, provided it be the same for all, by means of the tables calculated for this purpose, and which will be found below. The reason of it may be readily understood. The length of the bars of metal, or of other substances, which represent the stand- ard measures of length which obtain among different nations, varying with the tem- perature, it was necessary to determine a fixed point of temperature at which they really ought to have the length adopted as the standard unit of measure. This temperature is the normal temperature of the standard, and the length of the stand- ard-bar, at this temperature, is the true length of it. If the normal temperature of the various standards used for dividing Barometrical Scales were the same, the heights of the barometrical column, taken with these scales, could be compared directly, provided the scales be made of the same sub- stance, brass, for instance, because their variations above or below this normal tem- perature would remain parallel with each other. But unfortunately it is not so. The English Yard is a standard at the temperature of 62° Fahrenheit ; the Old French Toise, at 13° Reaumur ; the Metre, at the freezing point, or zero Centigrade. Thus metallic rods intended to represent these various units of measure give the true standard length only when at these respective temperatures ; at any other tem- perature they are longer or shorter than the standard, and their subdivisions, inches, ines, or millimetres, partake of the error. It is obvious, therefore, that the barometrical heights, taken with different scales, cannot be compared directly by means of the following tables, which give the re- ation between these scales at their respective normal temperatures. For suppose he temperature of the three barometers to be the freezing point, or 32° Fahrenheit, C 7 COMPARISON OF THE BAROMETRICAL SCALES. the scale of the Metrical Barometer alone will actually represent the standard length, and the millimeters will have the true length ; while the inches and lines of the Old French and of the English Barometers will be too short, causing thus the barometrical column to appear too high. If the temperature of the instruments be 62° Fahrenheit, the divisions of the English Barometer will have the true standard length, and those of the Old French Barometer nearly so ; but the millimeters of the Metrical Barome- ter will be too long, causing the barometrical column to appear too low. It is to neutralize the effect of those inequalities arising from the expansion of the scale that it is necessary, before comparing the observations taken with the three barome- ters, to reduce them to the same temperature. This is done by means of the tables above mentioned, for reducing the barometer to the freezing point, which suppose the scales to be of brass from top to bottom, and which take into account the expan- sion or contraction they undergo by the variations of temperature. But in doing so, we must be aware that the accuracy of the comparison depends in part upon the correctness of the indications of the attached thermometers, which determine the amount of the correction to be applied for reducing the barometers to the freezing point. If the thermometers do not agree, an error is introduced which will affect the height of the reduced columns, and the final comparison. Therefore the correction of the attached thermometers ought to be ascertained and applied to them before the reduction is made ; or if this correction is unknown, it will be well to place the instruments to be compared in the most favorable conditions for taking the same temperature, and then to take the temperature given by one of the thermometers to reduce both barometers. If the correction of the attached thermometer has not been applied before the reduction, it will be contained, after the reduction, in the total cor- rection of the instrument. If it be so, this circumstance must be indicated. In computing the following tables, the value of the Metre, as determined by Capt. Kater, (Philosoph. Transact, for 1818, p. 109, and Baily's Astronomical Tables, p. 192,) has been adopted, viz. 1 Metre, at 0° Centigrade = 39.37079 English inches, at 62° Fahrenheit. The relation of the Metre (legal) to the Old French system of measures is known to be 1 Metre — 443.296 French or Paris lines. From these equations are derived the elements used in the computations, which are found at the head of each table. Besides the larger Tables I. -VIII., a set of smaller ones, Tables IX. -XVI., has been added, which will be found useful for comparing Barometrical differences, such as ranges, amount of variation in a .given time, &/c., expressed in measures of differ- ent scales, in which only small quantities occur that are not found in the large tables. I. -II. COMPARISON OP THE ENGLISH BAROMETER THE METRICAL AND THE OLD FRENCH BAROMETERS, OR TABLES • FOR CONVERTING ENGLISH INCHES INTO MILLIMETRES, AND INTO FRENCH OR PARIS LINES AND DECIMALS ; GIVING THE VALUES CORRESPONDING TO EVERY TENTH OF AN INCH, FROM 9 TO 19 INCHES ; AND TO EVERY HUNDREDTH, FROM 19 TO 31.5 ENGLISH INCHES. USE OF TABLE I. Example. THE English Barometer reads 20.657 inches. What would be the corresponding height in the Metrical Barometer ? In Table I., first column on the left, look out the line of 20 inches 6 tenths ; or that line, in the sixth column, headed 5 hundredths, is found the value in milli- metres for 20.65 inches = 524.50 millimetres. At the bottom of the page, for 0.007 " = 0.18 " Or for 20.657 " = 524.68 which would be the reading of the Metrical Barometer. This example may serve for all tables, throughout the volume, which are constructed on the same plan. 10 I. COMPARISON OF THE ENGLISH AND METRICAL BAROMETERS. 1 English Inch = 25.39954 Millimetres. 1?nrr1'ia\\ Tenths of an Inch. J&ngUSn Inches. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 9 228.60 231.14 233.68 236.22 238.76 241.30 243.84 246.38 248.92 251.46 10 254.00 256.54 259.08 261.62 264.16 266.70 269.24 271.78 274.32 276.85 11 279.39 281.93 284.47 287.01 289.55 292.09 294.63 297.17 299.71 302.25 12 304.79 307.33 309.87 312.41 314.95 317.49 320.03 322.57 325.11 327.65 13 330 19 332.73 335.27 337.81 340.35 342.89 345.43 347.97 350.51 353.05 14 355.59 358.13 360.67 363.21 365.75 368.29 370.83 373.37 375.91 378.45 15 380.99 383.53 386.07 388.61 391.15 393.69 396.23 398.77 401.31 403.85 16 406.39 408.93 411.47 414.01 416.55 419.09 421.63 424.17 426.71 429.25 17 431.79 434.33 436.87 439.41 441.95 444.49 447.03 449.57 452.11 454.65 18 457.19 459.73 462.27 464.81 467.35 469.89 472.43 474.97 477.51 480.05 English Hundredths of an Inch. tenths. O. 1. 2. 3. 4. 5. 6. 7. 8. 9. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim Millim. Millim. 19.0 482.59 482.85 483.10 483.35 483.61 483.86 484.12 484.37 484.62 484.88 1 485.13 485.39 485.64 485.89 486.15 486.40 486.66 486.91 487.16 487.42 2 487.67 487.93 488.18 488.43 488.69 488.94 489.20 489.45 489.70 489.96 3 490.21 490.47 490.72 490.97 491.23 491.48 491.74 491.99 492.24 492.50 4 492.75 493.01 493.26 493.51 493.77 494.02 494.28 494.53 494.78 495.04 5 495.29 495.55 495.80 496.05 496.31 496.56 496.81 497.07 497.32 497.58 6 497.83 498.08 498.34 498.59 498.85 499.10 499.35 499.61 499.86 500.12 7 500.37 500.62 500.88 501.13 501.39 501.64 501.89 502.15 502.40 502.66 8 502.91 503.16 503.42 503.67 503.93 504.18 504.43 504.69 504.94 505.20 9 505.45 505.70 505.96 506.21 506.47 506.72 506.97 507.23 507.48 507.74 20.0 507.99 508.24 508.50 508.75 509.01 509.26 509.51 509.77 510.02 510.28 1 510.53 510.78 511.04 511.29 511.55 511.80 512.05 512.31 512.56 512.82 2 513.07 513.32 513.58 513.83 514.09 514.34 514.59 514.85 515.10 515.36 3 515.61 515.86 516.12 516.37 516.63 516.88 517.13 517.39 517.64 517.90 4 518.15 518.40 518.66 518.91 519.17 519.42 519.67 519.93 520.18 520.44 5 520.69 520.94 521.20 521.45 521.71 521.96 522.21 522.47 522.72 522.98 6 523.23 523.48 523.74 523.99 524.25 524.50 524.75 525.01 525.26 525.52 7 525.77 526.02 526.28 526.53 526.79 527.04 527.29 527.55 527.80 528.06 8 528.31 528.56 528.82 529.07 529.33 529.58 529.83 530.09 530.34 530.60 9 530.85 531.10 531.36 531.61 531.87 532.12 532.37 532.63 532.88 533.14 Thousandths of an Inch. o. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0.0 0.03 0.05 0.08 0.10 0.13 0.15 0.18 0.20 0.23 11 COMPARISON OF THE ENGLISH AND METRICAL BAROMETERS. Hundredths of an Inch. English Inches am tenths. o. 1. 2. 3. 4. 5. 6. 7. 8. 9. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. ,21.0 533.39 533.64 533.90 534.15 534.41 534.66 534.91 535.17 535.42 535.68 1 535.93 536.18 536.44 536.69 536.95 537.20 537.45 537.71 537.96 53822 2 538.47 538.72 538.98 539.23 539.49 539.74 539.99 540.25 540.50 540.76 3 541.01 541.26 541.52 541.77 542.03 542.28 542.53 542.79 543.04 543.30 4 543.55 543.80 544.06 544.31 544.57 544.82 545.07 545.33 545.58 545.84 5 546.09 546.34 546.60 546.85 547.11 547.36 547.61 547.87 548.12 548.38 6 548.63 548.88 549.14 549.39 549.65 549.90 550.15 550.41 550.66 550.92 7 551.17 551.42 551.68 551.93 552.19 552.44 552.69 552.95 553.20 553.46 8 553.71 553.96 554.22 554.47 554.73 554.98 555.23 555.49 555.74 556.00 9 556.25 556.50 556.76 557.01 557.27 557.52 557.77 558.03 558.28 558.54 22.0 558.79 559.04 559.30 559.55 559.81 560.06 560.31 560.57 560.82 561.08 1 561.33 561.58 561.84 562.09 562.35 562.60 562.85 563.11 563.36 563.62 2 563.87 564.12 564.38 564.63 564.89 565.14 565.39 565.65 565-90 566.16 3 566.41 566.66 566.92 567.17 567.43 567.68 567.93 568.19 568.44 568.70 4 568.95 569.20 569.46 560.71 569.97 570.22 570.47 570.73 570.98 571.24 5 571.49 571.74 572.00 572.25 572.51 572.76 573.01 573.27 573.52 573.78 6 574.03 574.28 574.54 574.79 575.05 575.30 575.55 575.81 576.06 576.32 7 576.57 576.82 577.08 577.33 577.59 577.84 578.09 578.35 578.60 578.86 8 579.11 579.36 579.62 579.87 580.13 580.38 580.63 580.89 581.14 581.40 9 581.65 581.90 582.16 582.41 582.67 582.92 583.17 583.43 583.68 583.94 23.0 584.19 584.44 584.70 584.95 585.21 585.46 585.71 585.97 586.22 586.48 1 586.73 586.98 587.24 587.49 587.75 588.00 588.25 588.51 588.76 589.02 2 589.27 589.52 589.78 590.03 590.29 590.54 590.79 591.05 591.30 591.56 3 591.81 592.06 592.32 592.57 592.83 593.08 593.33 593.59 593.84 594.10 4 594.35 594.60 594.86 595.11 595.37 595.62 595.87 596.13 596.38 596.64 5 596.89 597.14 597.40 597.65 597.91 598.16 598.41 598.67 598.92 599.18 6 599.43 599.68 599.94 600.19 600.45 600.70 600.95 601.21 601.46 601.72 7 601.97 602.22 602.48 602.73 602.99 603.24 603.49 603.75 604.00 604.26 8 604.51 604.76 605.02 605.27 605.53 605.78 606.03 606.29 606.54 606.79 9 607.05 607.30 607.56 607.81 608.06 608.32 608.57 608.83 609.08 609.33 24-0 609.59 609.84 610.10 610.35 610.60 610.86 611.11 611.37 611.62 611.87 1 612.13 612.38 612.64 612.89 613.14 613.40 613.65 613.91 614.16 614.41 2 614.67 614.92 615.18 615.43 615.68 615.94 616.19 616.45 616.70 616.95 3 617.21 617.46 617.72 617.97 618.22 618.48 618.73 618.99 619.24 619.49 4 619.75 620.00 620.26 620.51 620.76 621.02 621.27 621.53 621.78 622.03 . Thousandths of an Inch. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0.0 0.03 0.05 0.08 0.10 0.13 0.15 0.18 0.20 0.23 c COMPARISON OF THE ENGLISH AND METRICAL BAROMETERS. Hundredths of an lnc\. English Inches and tenths. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 24.5 622.29 622.54 622.80 623.05 623.30 623.56 623.81 624.07 624.32 624.57 6 624.83 625.08 625.34 625.59 625.84 626.10 626.35 626.61 626.86 627.11 7 627.37 627.62 627.88 628.13 628.38 628.64 628.89 629.15 629.40 629.65 8 629.91 630.16 630.42 630.67 630.92 631.18 631.43 631.69 631.94 632.19 9 632.45 632.70 632.96 633.21 633.46 633.72 633.97 634.23 634.48 634.73 25.0 634.99 635.24 635.50 637.75 636.00 636.26 636.51 636.77 637.02 637.27 1 637.53 637.78 638.04 638.29 638.54 638.80 639.05 639.31 639.56 639.81 2 640.07 640.32 640.58 640.83 641.08 641.34 641.59 641.85 642.10 642.35 3 642.61 642.86 643.12 643.37 643.62 643.88 644.13 644.39 644.64 644.89 4 645.15 645.40 645.66 645.91 646.16 646.42 646.67 646.93 647.18 647.43 5 647.69 647.94 648.20 648.45 648.70 648.96 649.21 649.47 649.72 649.97 6 650.23 650.48 650.74 650.99 651.24 651.50 651.75 652.01 652.26 652.51 7 652.77 653.02 653.28 653.53 653.78 654.04 654.29 654-55 654.80 655.05 8 655.31 655.56 655.82 656.07 656.32 656.58 656.83 657.09 657.34 657.59 9 657.85 658.10 658.36 658.61 658.86 659.12 659.37 659.63 659.88 660.13 26.0 660.39 660.64 660.90 661.15 661.40 661.66 661.91 662.17 662.42 662.67 1 662.93 663.18 663.44 663.69 663.94 664.20 664.45 664.71 664.96 665.21 2 665.47 665.72 665.98 666.23 666.48 666.74 666.99 667.25 667.50 667.75 3 668.01 668.26 668.52 668.77 669.02 669.28 669.53 669.79 670.04 670.29 4 670.55 670'80 671.06 671.31 671.56 671.82 672.07 672.33 672.58 672.83 5 673.09 673.34 673.60 673.85 674.10 674.36 674.61 674.87 675.12 675.37 6 675.63 675.88 676.14 676.39 676.64 676.90 677.15 677.41 677.66 677.91 7 678.17 678.42 678.68 678.93 679.18 679.44 679.69 679.95 680.20 680.45 8 680.71 680.96 681.22 681.47 681.72 681.98 682.23 682-49 682.74 682.99 9 683.25 683.50 683.76 684.01 684.26 684.52 684.77 685.03 685.28 685.5a 27.0 685.79 686.04 686.30 686.55 686.80 687.06 687.31 687.57 687.82 688.07 1 688.33 688.58 688.84 689.09 689.34 689.60 689.85 690.11 690.36 690.61 2 690.87 691.12 691.38 691.63 691.88 692.14 692.39 692.65 692.90 693.15 3 693.41 693.66 693.92 694.17 694.42 694.68 694.93 695.19 695.44 695.69 4 695.95 696.20 696.46 696-71 696.96 697.22 697.47 697.73 697.98 698.23 5 698.49 698.74 699.00 699.25 699.50 699.76 700.01 700.27 700.52 700.77 6 701.03 701.28 701.54 701.79 702.04 702.30 702.55 702.81 703.06 703.31 7 703.57 703.82 704.08 704.33 704.58 704.84 705.09 705.35 705.60 705.85 8 706.11 706.36 706.62 706.87 707.12 707.38 707.63 707.89 708.14 708.39 9 708.65 708.90 709.16 709.41 709.66 709.92 710.17 710.43 710.6$ 710.93 Thousandths of an Inch. o. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0.0 0.03 0.05 0.08 0.10 0.13 0.15 0.18 0.20 0.23 ia COMPARISON OF THE ENGLISH AND METRICAL BAROMETERS. Hundredtha of an Inch. English Inches anc tenths. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 28.0 711.19 711.44 711.70 711.95 712.20 712.46 712.71 712.97 713.22 713.47 1 713.73 713.98 714.24 714.49 714.74 715.00 715.25 71551 715.76 716.01 2 716.27 716.52 716.78 717.03 717.28 717.54 717.79 718.04 718.30 718.55 3 718.81 719.06 719.31 719.57 719.82 720.08 720.33 720.58 720.84 721.09 4 721.35 721.60 721.85 722.11 722.36 722.62 722.87 723.12 723.38 723.63 5 723.89 724.14 724.39 724.65 724.90 725.16 725.41 725.66 725.92 726.17 6 726.43 726.68 726.93 727.19 727.44 727.70 727.95 728.20 728.46 728.71 7 728.97 729.22 729.47 729.73 729.98 730.24 730.49 730.74 731.00 731.25 8 731.51 731.76 732.01 732.27 732.52 732.78 733.03 733.28 733.54 732.7) 9 734.05 734.30 734.55 734.81 735.06 735.32 735.57 735.82 736.08 736.33 29.0 736.59 736.84 737.09 737.35 737.60 737.86 738.11 738.36 738.62 738.87 1 739.13 739.38 739.63 739.89 740.14 740.40 740.65 740.90 741.16 741.41 2 741.67 741.92 742.17 742.43 742.68 742.94 743.19 743.44 743.70 743.95 3 744.21 744.46 744.71 744.97 745.22 745.48 745.73 745.98 746.24 746.49 4 746.75 747.00 747.25 747.51 747.76 748.02 748.27 748.52 748.78 749.03 5 749.29 749.54 74979 750.05 750.30 750.56 750.81 751.06 751.32 751.57 6 751.83 752.08 752.33 752.59 752.84 753.10 753.35 753.60 753.86 754.11 7 754.37 754.62 754.87 755.13 755.38 755.64 755.89 756.14 756.40 756.65 8 756.91 757.16 757.41 757.67 757.92 758.18 758.43 758.68 758.94 759.19 9 759.45 759.70 759.95 760.21 760.46 760.72 760.97 761.22 761.48 761.73 30.0 761.99 762.24 762.49 762.75 763.00 763.26 763.51 763.76 764.02 764.27 1 764.53 764.78 765.03 765.29 765.54 765.80 766.05 766.30 766.56 766.81 2 767.07 767.32 767.57 767.83 768.08 768.34 768.59 768.84 769.10 769.35 3 769.61 769.86 770.11 770.37 770.62 770.88 771.13 771.38 771.64 771.89 4 772.15 772.40 772.65 772.91 773.16 773.42 773.67 773.92 774.18 774.43 5 774.69 774.94 775.19 775.45 775.70 775.96 776.21 776.46 776.72 776.97 6 777.23 777.48 777.73 777.99 778.24 778.50 778.75 779.00 779.26 779.51 7 779.77 780.02 780.27 780.53 780.78 781.04 781.29 781.54 781.80 782.05 8 782.31 782.56 782.81 783.07 783.32 783.58 783.83 784.08 784.34 784.59 9 784.85 785.10 785.35 785.61 785.86 786.12 786.37 786.62 786.88 787.13 31.0 787.39 787.64 787.89 788.15 788.40 788.66 788.91 789.16 789.42 789.67 1 789.93 790.18 790.43 790.69 790.94 791.20 791.45 791.70 791.96 792.21 2 792.47 792.72 792.97 793.23 793.48 793.74 793.99 794.24 794.50 794.75 3 795.01 795.26 795.51 795.77 796.02 796.28 796.53 796.78 797.04 797.29 4 797.55 797.80 798.05 798.31 798.56 798.82 799.07 799.32 799.58 799.83 Thousandths of an Inch. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0.0 0.03 0.05 0.08 0.10 0.13 0.15 0.18 0.20 0.23 L 14 II. COMPARISON OF THE ENGLISH AND OLD FRENCH BAROMETERS. 1 English Inch = 11.2595 French or Paris Lines. English Tenths of an Inch. Inches. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Par.lines Par.lines. Par.lines Par.lines Par.lines. Par lines Par.lines . Par.lines . Par.lines . Par.lines. 11 123.85 124.9S 126.11 127.23 128.36 129.48 130.61 131.74 132.86 133.99 12 135.11 136.24 137.37 138.49 139.62 140.74 141.87 143.00 144.12 145.25 13 146.37 147.50 148.63 149.75 150.88 152.00 153.13 154.26 155.38 156.51 14 157.63 158.76 159.88 161.01 162.14 163.26 164.39 165.51 166.64 167.77 15 168.89 170.02 171.14 172.27 173 40 174.52 175.65 176.77 177.90 179.03 16 180.15 181.28 182.40 183.53 184.66 185.78 186.91 188.03 189.16 190.29 Hundredths of an Inch. o. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0.000 0.113 0.225 0.338 0.450 0.563 0.676 0.788 0.901 1.013 Tr**ir»i;nVi Hundredths of an Inch. i^ngusn Inches and Tenths. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Par.lines Par.lines Par .lines Par.lines.; Par.lines Par lines. Par.lines. Par.lines Par.lines Par.lines. 17.0 191.41 191.52 191.64 191.75 191.86 191.97 192.09 192.20 192.31 192.42 1 192.54 192.65 192.76 192.88 192.99 193.10 193.21 193.33 193.44 193.55 2 193.66 193.78 193.89 194.00 194.11 194.23 194.34 194.45 194.56 194.68 3 194.79 194.90 195.01 195.13 195.24 195.35 195.46 195.58 195.69 195.80 4 195.92 196-03 196.14 196.25 196.37 196.48 196.59 196.70 196.82 196.93 5 197.04 197.15 197.27 197.38 197.49 197.60 197.72 197.83 197.94 198.05 6 198.17 198.28 198.39 198.50 198.62 198.73 198.84 198.96 199.07 199.18 7 199.29 199.41 199.52 199.63 199.74 199.86 199.97 200.08 200.19 200.31 8 200.42 200.53 200.64 200.76 200.87 200.98 201.09 201.21 201.32 201.43 9 201.55 201.66 201.77 201.88 202.00 202.11 202.22 202.33 202.45 202.56 18.0 202.67 202.78 202.90 203.01 203.12 203.23 203.35 203.46 203.57 203.68 1 203.80 203.91 204.02 204.13 204.25 204.36 204.47 204.59 204.70 204.81 2 204.92 205.04 205.15 205.26 205.37 205.49 205.60 205.71 205.82 205.94 3 206.05 206.16 206.27 206.39 206.50 206.61 206.72 206.84 206.95 207.06 4 207.17 207.29 207.40 207.51 207.63 207.74 207.85 207.96 208.08 208.19 5 208.30 208.41 208.53 208.64 208.75 208.86 208.98 209.09 209.20 209.31 6 209.43 209.54 209.65 209.76 209.88 209.99 210.10 210.21 210.33 210.44 7 210.55 210.67 210.78 210.89 211.00 211.12 211.23 211.34 211.45 211.57 8 211.68 211.79 211.90 212.02 212.13 212.24 212.35 212.47 212.58 212.69 9 212.80 212.92 213.03 213.14 213.25 213.37 213.48 213.59 213.71 213.82 19.0 213.93 214.04 214.16 214.27 214.38 214.49 214.61 214.72 214.83 214.94 1 215.06 215.17 215.28 215.39 215.51 215.62 215.73 215.84 215.96 216.07 2 216.18 216.29 216.41 216.52 216.63 216.75 216.86 216.97 217.08 217.20 3 217.31 217.42 217.53 217.65 217.76 217.87 217.98 218.10 218.21 218.32 4 218.43 218.55 218.66 218.77 218.88 219.00 219.11 219.22 219.34 219.45 5 219.56 219.67 219.79 219.90 220.01 220.12 220.24 220.35 220.46 220.57 6 220.69 220.80 220.91 221.02 221.14 221.25 221.36 221.47 221.59 221.70 7 221.81 221.92 222.04 222.15 222.26 222.38 222.49 222.60 222.71 222.83 8 222.94 223.05 223.16 223.28 223.39 223.50 223.61 228.73 223.84 223.95 9 224.06 224.18 224.29 224.40 224.51 224.63 224.74 224.85 224.96 225.08 15 COMPARISON OF THE ENGLISH AND OLD FRENCH BAROMETERS. 1 English Inch = 11.2595 French or Paris Lines. English Hundredths of an Inch. i Inches and Tenths. 0. 1. 2. 3. 4. 5. 6. *• 8. 9. Par.lines. Par.lines. Par.lines. Par.lines. Par.lines Par.lines. Par.lines. Par.lines. Par.lines Par.lines. 20.0 225.19 225.30 225.42 225.53 225.64 225.75 225.87 225.98 226.09 226.20 1 226.32 226.43 226.54 226.65 226.77 226.88 226.99 227.10 227.22 227.33 2 227.44 227.55 227.67 227.78 227.89 228.00 228.12 228.23 228.34 228.46 3 228.57 228.68 228.79 228.91 229.02 229.13 229.24 229.36 229.47 229.58 4 229.69 229.81 229.92 230.03 230.14 230.26 230.37 230.48 230.59 230.71 5 230.82 230.93 231.04 231.16 231.27 231.38 231.50 231.61 231.72 231.83 6 231.95 232.06 232.17 232.28 232.40 232.51 232.62 232.73 232.85 232.96 7 233.07 233.18 233.30 233.41 233.52 233.63 233.75 233.86 233.97 234.09 8 234.20 234.31 234.42 234.54 234.65 234.76 234.87 234.99 235.10 235.21 9 235.32 235.44 235.55 235.66 235.77 235.89 236.00 236.11 236.22 236.34 21.0 236.45 236.56 236.67 236.79 236.90 237.01 237.13 237.24 237.35 237.46 xl 237.58 237.69 237.80 237.91 238.03 238.14 238.25 238.36 238.48 238.59 2 238.70 238.81 238.93 239.04 239.15 239.26 • 239.38 239.49 239.60 239.71 3 239.83 239.94 240.05 240.17 240.28 240.39 240.50 240.62 240.73 240.84 4 240.95 241.07 241.18 241.29 241.40 241.52 241.63 241.74 241.85 241.97 5 242.08 242.19 242.30 242.42 242.53 242.64 242.75 242.87 242.98 243.09 6 243.21 243.32 243.43 243.54 243.66 243.77 243.88 243.99 241.11 244.22 7 244.33 244.44 244.56 244.67 244.78 244.89 245.01 245.12 245.23 245.34 8 245.46 245.57 245.68 245.79 245.91 246.02 246.13 246.25 246.36 246.47 9 246.58 246.70 246.81 246.92 247.03 247.15 247.26 247.37 247.48 247.60 22.0 247.71 247.82 247.93 248.05 248.16 248.27 248.38 248.50 248.61 248.72 1 248.83 248.95 249.06 249.17 249.29 249.40 249.51 249.62 249.74 249.85 2 249.96 250.07 250.19 250.30 250.41 250.52 250.64 250.75 250.86 250.97 3 251.09 251.20 251.31 251.42 251.54 251.65 251.76 251.88 251.99 252.10 4 252.21 252.33 252.44 252.55 252.66 252.78 252.89 253.00 253.11 253.23 5 253-34 253.45 253.56 253.68 253.79 253.90 254.01 254.13 254.24 254.35 6 254.46 254.58 254.69 254.80 254.92 255.03 255.14 255.25 255.37 255.48 7 255.59 255.70 255.82 255.93 256.04 256.15 256.27 256.38 256.49 256.60 8 256.72 256.83 256.94 257.05 257.17 257.28 257.39 257.50 257.62 257.73 9 257.84 257.96 258.07 258.18 258.29 258.41 258.52 258.63 258.74 258.86 23.0 258.97 259.08 259.19 259.31 259.42 259.53 259.64 259.76 259.87 259.98 1 260.09 260.21 260.32 260.43 260.54 260.66 260.77 260.88 261.00 261.11 2 261.22 261.33 261.45 261.56 261.67 261.78 261.90 262.01 262.12 262.23 3 262.35 262.46 262^57 262.68 262.80 262.91 263.02 263.13 263.25 263.36 4 263.47 «63.58 263.70 263.81 263.92 264.04 264.15 264.26 264.37 264.49 5 264.60 264.71 264.82 264.94 265.05 265.16 265.27 265.39 265.50 265.61 6 265.72 265.84 265.95 266.06 266.17 266.29 266.40 266.51 266.62 266.74 7 266.85 266.96 267.08 267.19 267.30 267.41 267.53 267.64 267.75 267.86 8 267.98 268.09 268.20 268.31 268.43 268.54 268.65 268.76 268.88 268.99 9 269.10 269.21 269.33 269.44 269.55 269.67 269.78 269.89 270.00 270.12 o. 1. 2. 3. 4. 5. 6. 7. 8. 9. 16 COMPARISON OF THE ENGLISH AND OLD FRENCH BAROMETERS. 1 English Inch = 11.2595 French or Paris Lines. English Hundredths of an Inch. Inches uud Tenths. 0. 1. 2. 3. 4. 5. 6. 7. j 8. 9. , Par.lines. Par.lines. Par.lines. Par.lines. Par.lines Par.lines. Par.lines. Par.lines. Par.lines. Par.lines. 24.0 270.23 270.34 270.45 270.57 270.68 270.79 270.90 271.02 271.13 271.24 1 271.35 271.47 271.58 271.69 271.80 271.92 272.03 272.14 272.25 272.37 2 272.48 272.59 272.71 272.82. 272.93 273.04 273.16 273.27 273.38 273.49 3 273.61 273.72 273.83 273.94 274.06 274.17 274.28 274.39 274.51 274.62 4 274.73 274.84 274.96 275.07 275.18 275.29 275.41 275.52 275.63 275.75 5 275.86 275.97 276.08 276.20 276.31 276.42 276.53 276.65 276.76 276.87 6 276.98 277.10 277.21 277.32 277.43 277.55 277.66 277.77 277.88 278.00 7 278.11 278.22 278.33 278.45 278.56 278.67 278.79 278.90 279.01 279.12 8 279.24 279.35 279.46 279.57 279.69 279.80 279.91 280.02 280.14 280.25 9 280.36 280.47 280.59 280.70 280.81 280.92 281.04 281.15 281.26 281.38 25.0 281.49 281.60 281.71 281.83 281.94 282.05 282.16 282.28 282.39 282.50 i 282.61 282.73 282.84 282.95 283.06 283.18 283.29 283.40 283.51 283.63 2 283.74 283.85 283.96 284.08 284.19 284.30 284.41 284.53 284.64 284.75 3 284.87 284.98 285.09 285.20 285.32 285.43 285.54 285.65 285.77 285.88 4 285.99 286.10 286.22 286.33 286.44 286.55 286.67 286.78 286.89 287.00 5 287.12 287.23 287.34 287.46 287.57 287.68 287.79 287.91 288.02 288.13 6 288.24 288.36 288.47 288.58 288.69 288.81 288.92 289.03 289.14 289.26 7 289.37 289.48 289.59 289.71 289.82 289.93 290.04 290.16 290.27 290.38 8 290.50 290.61 290.72 290.83 290.95 291.06 291.17 291.28 291.40 291.51 9 291.62 291.73 291.85 291.96 292.07 292.18 292.30 292.41 292.52 292.63 26.0 292.75 292.86 292.97 293.08 293.20 293.31 293.42 293.54 293.65 293.76 1 293.87 293.99 294.10 294.21 294.32 294.44 294.55 294.66 294.77 294.89 2 295.00 295.11 295.22 295.34 295.45 295.56 295.67 295.79 295.90 296.01 3 296.12 296.24 296.35 296.46 296.58 296.69 296.80 296.91 297.03 297.14 4 297.25 297.36 297.48 297.59 297.70 297.81 297.93 298.04 298.15 298.26 5 293.38 298.49 298.60 298.71 298.83 298.94 299.05 299.17 299.28 299.39 6 299.50 299.62 299.73 299.84 299.95 300.07 300.18 300.29 300.40 300.52 7 300.63 300.74 300.85 300.97 301.08 301.19 301.30 301.42 301.53 301.64 8 301.75 301.87 301.98 302.09 302.20 302.32 302.43 302.54 302.66 302.77 9 302.88 302.99 303.11 303.22 303.33 303.44 303.56 303.67 303.78 303.89 27.o 304.01 304.12 304.23 304.34 304.46 304.57 304.68 304.79 304.91 305.02 1 305.13 305.25 305.36 305.47 305.58 305.70 305.81 305.92 306.03 306.15 2 306.26 306.37 306.48 306.60 306.71 306.82 306.93 307.05 307.16 307.27 3 307.38 307.50 307.61 307.72 307.83 307.95 308.06 308.17 308.29 308.40 4 308.51 308.62 308.74 308.85 308.96 309.07 309.19 309.30 309.41 309.52 5 309.64 309.75 309.86 309.97 310.09 310.20 310.31 310.42 310.54 310.65 6 310.76 310.87 310.99 311.10 311.21 311.33 311.44 311.55 311.66 311.78 7 311.89 312.00 312.11 312.23 312.34 312.45 312.56 312.68 312.79 312.90 8 313.01 313.13 313.24 313.35 313.46 313.58 313.69 313.80 313.91 314.03 9 314.14 314.25 314.37 314.48 314.59 314.70 314.82 314.93 315.04 315.15 O. 1. 2. 3. 4. 5. 6. 7. 8. 9. 17 4 COMPARISON OF THE ENGLISH AND OLD FRENCH BAROMETERS. 1 English Inch = 11.2595 French or Paris Lines. Hundredths of an Inch. English Inches and Tenths. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Par.lines. Par.lines. Par.lines. Par.lines. Par.lines. Par.lines. Par.lines. Par.lines. Par.lines. Par.lines. 28.0 315.27 315.38 315.49 315.60 315.72 315.83 315.94 316.05 316.17 316.28 1 316.39 316.50 316.62 316.73 316.84 316.95 317.07 317.18 317.29 317.41 2 317.52 317.63 317.74 317.86 317.97 318.08 318.19 318.31 318.42 318.53 3 318.64 318.76 318.87 318.98 319.09 319.21 319.32 319.43 319.54 319.66 4 319.77 319.88 319.99 320.11 320.22 320.33 320.45 320.56 320.67 320.78 5 320.90 321.01 321.12 321.23 321.35 321.46 321.57 321.68 321.80 321.91 6 322.02 322.13 322.25 322.36 322.47 322.58 322.70 322.81 322.92 323.04 7 323.15 323.26 323.37 323.49 323.60 323.71 323.82 323.94 324.05 324.16 8 324.27 324.39 324.50 324.61 324.72 324.84 324.95 325.06 325.17 325.29 9 325.40 325.51 325.62 325.74 325.85 325.96 326.08 326.19 326.30 326.41 29.0 326.53 326.64 326.75 326.86 326.98 327.09 327.20 327.31 327.43 327.54 1 327.65 327.76 327.88 327.99 328.10 328.21 328.33 328.44 328.55 328.66 2 328.78 328.89 329.00 329.12 329.23 329.34 329.45 329.57 329.68 329.79 3 329.90 330.02 330.13 330.24 330.35 330.47 330.58 330.69 330.80 330.92 4 331.03 331.14 331.25 331.37 331.48 331.59 331.70 331.82 331.93 332.04 5 332.16 332.27 332.38 332.49 332.61 332.72 332.83 332.94 333.06 333.17 6 333.28 333.39 333 51 333.62 333.73 333.84 333.96 334.07 334.18 334.29 7 334.41 334.52 334.63 334.74 334.86 334.97 335.08 335.20 335.31 335.42 8 335.53 335.65 335.76 335.87 335.98 336.10 336.21 336.32 336.43 336.55 9 336.66 336.77 336.88 337.00 337.11 337.22 337.33 337.45 337.56 337.67 30.0 337.78 337.90 338.01 338.12 338.24 338.35 338.46 338.57 338.69 338.80 1 338.91 339.02 339.14 339.25 339.36 339.47 339.59 339.70 339.81 339.92 2 310.04 340.15 340.26 340.37 340.49 340.60 340.71 340.83 340.94 341.05 3 341.16 341.28 341.39 341.50 341.61 341.73 341.84 341.95 342.06 342.18 4 342.29 342.40 342.51 342.63 342.74 342.85 342.96 343.08 343.19 343.30 5 343.41 343.53 343.64 343.75 343.87 343.98 344.09 344.20 344.32 344.43 6 344.54 344.65 344.77 344.88 344.99 345.10 345.22 345.33 345.44 345.55 7 345.67 345.78 345.89 346.00 346.12 346.23 346.34 346.45 346.57 346.68 8 346.79 346.91 347.02 347.13 347.24 347.36 347.47 347.58 347.69 347.81 9 347.92 348.03 348.14 348.26 348.37 348.48 348.59 348.71 348.82 348.93 31.o 349.04 349.16 349.27 349.38 349.49 349.61 349.72 349.83 349.95 350.06 1 350.17 350.28 350.40 350.51 350.62 350.73 350.85 350.96 351.07 351.18 2 351.30 351.41 351.52 351.63 351.75 351.86 351.97 352.08 352.20 352.31 3 352.42 352.53 352.65 352.76 352.87 352.99 353.10 353.21 353.32 353.44 4 353.55 353.66 353.77 353.89 354.00 354.11 354.22 354.34 354.45 354.56 5 354.67 354.79 354.90 355.01 355.12 355.24 355.35 355.46 355.57 355.69 6 355.80 355.91 356.03 356.14 356.25 356.36 356.48 356.59 356,70 356.81 Thousandths of an Inch. 0. 1. i> 3. 4. 5. 6. ?. 8. 9. 0.000 0.011 0.023 0.034 0.045 0.056 0.068 0.079 0.090 0.101 18 III. -IV. COMPARISON OF THE METRICAL BAROMETER THE ENGLISH AND THE OLD FRENCH BAROMETERS, OR TABLES FOR CONVERTING MILLIMETRES INTO ENGLISH INCHES AND DECIMALS, AND INTO FRENCH OR PARIS LINES ; GIVING THE VALUES CORRESPONDING TO EVERY MILLIMETRE FROM 250 TO 600 J AND TO EVERY TENTH OP A MILLIMETRE FROM 600 TO 800 MILLIMETRES. 19 III. COMPARISON OF THE METRICAL AND ENGLISH BAROMETERS. 1 Metre = 39.37079 English Inches. Millime- tres. Tens. Millimetres. Units. o. 1. 2. 3. 4. 5. 6. 7. 8. 9. 250 Eng. In. 9.843 Eng. In. 9.882 Eng. In. 9.921 Eng. In. 9.961 Eng. In. 10.000 Eng. In. 10.040 Eng. In. 10.079 Eng. In 10.118 Eng. In. 10.158 Eng. In. 10.197 260 10.236 10.276 10.315 10.355 10.394 10.433 10.473 10.512 10.551 10.591 270 280 10.630 11.024 10.669 11.063 10.709 11.103 10.748 11.142 10.^88 11.181 10.827 11.221 10.866 11.260 10.906 11.299 10.945 11.339 10.984 11.378 290 11.418 11.457 11.496 11.536 11.575 11.614 11.654 11.693 11.732 11.772 300 11.811 11.851 11.890 11.929 11.969 12.008 12.047 12.087 12.126 12.166 310 12.205 12.244 12.284 12.323 12.362 12.402 12.441 12.481 12.520 12.559 320 12.599 12.638 12.677 12.717 12.756 12.795 12.835 12.874 12.914 12.953 330 12.992 13.032 13.071 13.110 13.150 13.189 13.229 13.268 13.307 13.b47 340 13.386 13.425 13.465 13.504 13.544 13.583 13.622 13.662 13.701 13.740 350 13.780 13.819 13.859 13.898 13.937 13.977 14.016 14.055 14.095 14.134 360 14.173 14.213 14.252 14.292 14.331 14.370 14.410 14.449 14.488 14.528 370 14.567 14.607 14.646 14.685 14.725 14.764 14.803 14.843 14.882 14.922 380 14.961 15.000 15.040 15.079 15.118 15.158 15.197 15-236 15.276 15.315 390 15.355 15.494 15.433 15.473 15.512 15.551 15.591 15.630 15.670 15.709 400 15.748 15.788 15.827 15.866 15.906 15.945 15.985 16.024 16.063 16.103 410 16.142 16.181 16.221 16.260 16.300 16.339 16.378 16.418 16.458 16.496 420 16.536 16.575 16.614 16.654 16.693 16.733 16.772 16.811 16.851 16.890 430 16.929 16.969 17.008 17.048 17.087 17.126 17.166 17.205 17.244 17.284 440 17.323 17.362 17.402 17.441 17.481 17.520 17.559 17.599 17.638 17.677 450 17.717 17.756 17.796 17.835 17.874 17.914 17.953 17.992 18.032 18.071 460 18.111 18.150 18.189 18.229 18.268 18.307 18.347 18.386 18.426 18.465 470 18.504 18.544 18.583 18.622 18.662 18.701 18.740 18.780 18.819 18.859 480 18.898 18.937 18.977 19.016 19.055 19.095 19.134 19.174 19.213 19.252 490 19.292 19.331 19.370 19.410 19.449 19.489 19.528 19.567 19.607 19.646 500 19.685 19.725 19.764 19.804 19.843 19.882 19.922 19.961 20.000 20.040 510 20.079 20.118 20.158 20.197 20.237 20.276 20.315 20.355 20.394 20.433 520 20.473 20.512 20.552 20.591 20.630 20.670 20.709 20.748 20.788 20.827 530 20.867 20.906 20.945 20.985 21.024 21.063 21.103 21.142 21.181 21.221 540 21.260 21.300 21.339 21.378 21.418 21.457 21.496 21.536 21.575 21.615 550 21.654 21.693 21.733 21.772 21.811 21.851 21.890 21.930 21.969 22.008 560 22.048 22.087 22.126 22.166 22.205 22.244 22.284 22.323 22.363 22.402 570 22.441 22.481 22.520 22.559 22.599 22.638 22.678 22.717 22.756 22.796 580 22.835 22.874 22.914 22.953 22.993 23.032 23.071 23.111 23.150 23.189 590 23.229 23.268 23.308 23.347 23.386 23.426 23.465 23.504 23.544 23.583 Tenths of Millimetres. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0.000 0.004 0.008 0.012 0.016 0.020 0.024 0.028 0.031 0.035 COMPARISON OF THE METRICAL AND ENGLISH BAROMETERS. 1 Metre = 39.37079 English Inches. Millime- Tenths of Millimetres. tres. o. 1. 2. 3. 4. 5. 6. 7. 8. 9. Eng In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. 600 23.622 23.626 23.630 23.634 23.638 23.642 23.646 23.650 23.654 23.658 601 23.662 23.666 23.670 23.674 23.678 23.682 23.685 23.689 23.693 23.697 602 23.701 23.705 23.709 23.713 23.717 23.721 23.725 23.729 23.733 23.737 603 23.741 23.745 23.748 23.752 20.756 23.760 23.764 23.768 23.772 23.776 604 23.780 23.784 23.788 23.792 23.796 23.800 23.804 23.808 23.811 23.815 605 23.819 23.823 23.827 23.831 23.835 23.839 23.843 23.847 23.851 23.855 606 23.859 23.863 23.867 23.871 23.874 23.878 23.882 23.886 23.890 23.894 607 23.898 23.902 23.906 23.910 23.914 23.918 23.922 23.926 23.930 23.934 608 23.937 23.941 23.945 23.949 23.953 23.957 23.961 23.965 23.969 23.973 60.9 23.977 23.981 23.985 23.989 23.993 23.996 24.000 24.004 24.008 24.012 610 24.016 24.020 24.024 24.028 24.032 24.036 24.040 24.044 24.048 24.052 611 24.056 24.059 24.063 24.067 24.071 24.075 24.079 24.083 24.087 24.091 612 24.095 24.099 24.103 24.107 24.111 24.115 24.119 24.122 24.126 24.130 613 24.134 24.138 24.142 24.146 24.150 24.154 24.158 24.162 24.166 24.170 614 24.174 24.178 24.182 24.185 24.189 24.193 24.197 24.201 24.205 24.209 615 24.213 24.217 24.221 24.225 24.229 24.233 24.237 24.241 24.245 24.248 616 24.252 24.256 24.260 24.264 24.268 24.272 24.276 24.280 24.284 24.288 617 24.292 24.296 24.300 24.304 24.308 24.311 24.315 24.319 24.323 24.327 613 24.331 24.335 24.339 24.343 24.347 24.351 24.355 24.359 24.363 24.367 619 24.371 24.374 24.378 24.382 24.386 24.390 24.394 24.398 24.402 24.406 620 24.410 24.414 24.418 24.422 24.426 24.430 24.434 24.437 24.441 24.445 621 24.449 24.453 24.457 24.461 24.465 24.469 24.473 24.477 24.481 24.485 622 24.489 24.493 24.497 24.500 24.504 24.508 24.512 24.516 24.520 24.524 623 24.528 24.532 24.536 24.540 24.544 24.548 24.552 24.556 24.559 24.563 624 24.567 24.571 24.575 24.579 24.583 24,587 24.591 24.595 24.599 24.603 625 24.607 24.611 24.615 24.619 24.622 24.626 24.630 24.634 24.638 24.642 626 24.646 24.650 24.654 24.658 24.662 24.666 24.670 24.674- 24.678 24.682 627 24.685 24.689 24.693 24.697 24.701 24.705 24.709 24.713 24.717 24.721 628 24.725 24.729 24.733 24.737 24.741 24.745 24.748 24.752 24.756 24.760 629 24.764 24.768 24.772 24.776 24.780 24.784 24.788 24.792 24.796 24.800 630 24.804 24.808 24.811 24.815 24.819 24.823 24.827 24.831 24.835 24.839 631 24.843 24.847 24.851 24.855 24.859 24.863 24.867 24.871 24.874 24.878 632 24.882 24.886 24.890 24.894 24.898 24.902 24.906 24.910 24.914 24.918 633 24.922 24.926 24.930 24.934 24.937 24.941 24.945 24.949 24.953 24.957 634 24.961 24.965 24.969 24.973 24.977 24.981 24.985 24.989 24.993 24.997 635 25.000 25.004 25.008 25.012 25.016 25.020 25.024 25.028 25.032 25.036 636 25.040 25.044 25.048 25.052 25.056 25.060 25.063 25.067 25.071 25.075 637 25.079 25.083 25.087 25.091 25.095 25.099 25.103 25.107 25.111 25.115 638 25.119 25.123 25.126 25.130 25.134 25.138 25.142 25.146 25.150 25.154 639 25.158 25.162 25.166 25.170 25.174 25.178 25.182 25.185 25.189 25.193 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 22 COMPARISON OF THE METRICAL AND ENGLISH BAROMETERS. 1 Metre == 39.37079 English Inches^ Tenths of Millimetres. ! Millime- r 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Eng. In. Eng. In. Eng. In. Eng. In. Eng In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. 640 25.197 25.201 25.205 25.209 25.213 25.217 25.221 25.225 25.229 25.233 641 25.237 25.241 25.245 25.248 25.252 25256 25.260 25.264 25.268 25.272 642 25.276 25.280 25.284 25.288 25.292 25.296 25.300 25.304 25.308 25.311 643 25.315 25.319 25.323 25.327 25.331 25.335 25.339 25.343 25.347 25.351 644 25.355 25.359 25.363 25.367 25.371 25.374 25.378 25.382 25.386 25.390 645 25.394 25.398 25.402 25.406 25.410 25.414 25.418 25.422 25.426 25.430 646 25.434 25.437 25.441 25.445 25.449 25.453 25.457 25.461 25.465 25.469 647 25.473 25.477 25.481 25.485 25.489 25.493 25.497 25.500 25.504 25.508 648 25.512 25.516 25.520 25.524 25.528 25.532 25.536 25.540 25.544 25.548 649 25.552 25.556 25.560 25.563 25.567 25.571 25.575 25.579 25.583 25.587 650 25.591 25.595 25.599 25.603 25.607 25.611 25.615 25.619 25.623 25.626 651 25.630 25.634 25.638 25.642 25.646 25.650 25.654 25.658 25.662 25.666 652 25.670 25.674 25.678 25.682 25.686 25.689 25.693 25.697 25.701 25.705 653 25.709 25.713 25.717 25.721 25.725 25.729 25.733 25.737 25.741 25.745 654 25.748 25.752 25.756 25.760 25.764 25.768 25.772 25.776 25.780 25.784 655 25.788 25.792 25.796 25.800 25.804 25.808 25.811 25.815 25.819 25.823 656 25.827 25.831 25.835 25.839 25.843 25.847 25.851 25.855 25.859 25.863 657 25.867 25.871 25.874 25.878 25.882 25.886 25.890 25.894 25.898 25.902 658 25.906 25.910 25.914 25.918 25.922 25.926 25.930 25.934 25.937 25.941 659 25.945 25.949 25.953 25.957 25.961 25.965 25.969 25.973 25.977 25.981 660 25.985 25.989 25.993 25.997 26.000 26.004 26.008 26.012 26.016 26.020 661 26.024 26.028 26.032 26.036 26.040 26.044 26.048 26.052 26.056 26.060 662 26.063 26.067 26.071 26.075 26.079 26.083 26.087 26.091 26.095 26.099 663 26.103 26.107 26.111 26.115 26.119 26.123 26.126 26.130 26.134 26.138 664 26.142 26.146 26.150 26.154 26.158 26.162 26.166 26.170 26.174 26.178 665 26.182 26.186 26.189 26.193 26.197 26.201, 26.205 26.209 26.213 26.217 666 26 221 26.225 26.229 26.233 26.237 26.241 26.245 26.249 26.252 26.256 667 26.260 26.264 26.268 26.272 26.276 26.280 26.284 26.288 26.292 26.296 668 26.300 26.304 26.308 26.311 26.315 26.319 26.323 26.327 26.331 26.335 669 26.339 26.343 26.347 26.351 26.355 26.359 26.363 26.367 26.371 26.374 670 26.378 26.382 26.386 26.390 26.394 26.398 26.402 26.406 26.410 26.414 671 26.418 26.422 26.426 26.430 26.434 26.437 26.441 26.445 26.449 26.453 672 26.457 26.461 26.465 26.469 26.473 26.477 26.481 26.485 26.489 26.493 673 26.497 26.500 26.504 26.508 26.512 26.516 26.520 26.524 26.528 26.532 674 26.536 26.540 26.544 26.548 26.552 26.556 26.560 26.563 26.567 26.571 675 26.575 26.579 26.583 26.587 26.591 26.595 26.599 26.603 26.607 26.611 676 26.615 26.619 26.623 26.626 26.630 26.634 26.638 26.642 26.646 26.650 677 26.654 26.658 26.662 26.666 26.670 26.674 26.678 26.682 26.686 26.689 678 26.693 26.697 26.701 26.705 26.709 26.713 26.717 26.721 26.725 26.729 679 26.733 26.737 26.741 26.745 26.749 26.752 26.756 26.760 26.764 26.768 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. |l 23 COMPARISON OF THE METRICAL AND ENGLISH BAROMETERS. 1 Metre = 39.37079 English Inches. Millime- Tenths of Millimetres. tres. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. i 680 26.772 26.776 26.780 26.784 26.788 26.792 26.796 26.800 26.804 26.808 681 26.812 26.815 26.819 26.823 26.827 26.831 26.835 26.839 26.843 26.847 682 26.851 26.855 26.859 26.863 26.867 26.871 26.875 26.878 26.882 26.886 683 26.890 26.894 26.898 26.902 26.906 26.910 26.914 26.918 26.922 26.926 684 26.930 26.934 26.937 26.941 26.945 26.949 26.953 26.957 26.961 26.965 685 26.969 26.973 26.977 26.981 26.985 26.989 26.993 26.997 27.000 27.004 686 27.008 27.012 27.016 27.020 27.024 27.028 27.032 27.036 27.040 27.044 687 27.048 27.052 27.056 27.060 27.063 27.067 27.071 27.075 27.079 27.083 688 27.087 27.091 27.095 27.099 27.103 27.107 27.111 27.115 27.119 27.123 689 27.126 27.130 27.134 27.138 27.142 27.146 27.150 27.154 27.158 27.162 690 27.166 27.170 27.174 27.178 27.182 27.186 27.189 27.193 27.197 27.201 691 27.205 27.209 27.213 27.217 27.221 27.225 27.229 27.233 27.237 27.241 692 27.245 27.249 27.252 27.256 27.260 27.264 27.268 27.272 27.276 27.280 693 27.284 27.288 27.292 27.296 27.300 27.304 27.308 27.312 27.315 27.319 694 27.323 27.327 27.331 27.335 27.339 27.343 27.347 27.351 27.355 27.359 695 27.363 27.367 27.371 27.375 27.378 27.382 27.386 27.390 27.394 27.398 696 27.402 27.406 27.410 27.414 27.418 27.422 27.426 27.430 27.434 27.438 697 27.441 27.445 27.449 27.453 27.457 27.461 27.465 27.469 27.473 27.477 698 27.481 27.485 27.489 27.493 27.497 27.500 27.504 27.508 27.512 27.516 699 27.520 27.524 27.528 27.532 27.536 27.540 27.544 27.548 27.552 27.556 700 27.560 27.563 27.567 27.571 27.575 27.579 27.583 27.587 27.591 27.595 701 27.599 27.603 27.607 27.611 27.615 27.619 27.623 27.626 27.630 27.634 702 27.638 27.642 27.646 27.650 27.654 27.658 27.662 27.666 27.670 27.674 703 27.678 27.682 27.686 27.689 27.693 27.697 27.701 27.705 27.709 27.713 704 27.717 27.721 27.725 27.729 27.733 27.737 27.741 27.745 27.749 27.752 705 27.756 27.760 27.764 27.768 27.772 27.776 27.780 27.784 27.788 27.792 706 27.796 27.800 27.804 27.808 27.812 27.815 27.819 27.823 27.827 27.831 707 27.835 27.839 27.843 27.847 27.851 27.855 27.859 27.863 27.867 27.871 708 27.875 27.878 27.882 27.886 27.890 27.894 27.898 27.902 27.906 27.910 709 27.914 27.918 27.922 27.926 27.930 27.934 27.938 27.941 27.945 27.949 710 27.953 27.957 27.961 27.965 27.969 27.973 27.977 27.981 27.985 27.989 711 27.993 27.997 28.001 28.004 28.008 28.012 28.016 28.020 28.024 28.028 712 28.032 28.036 28.040 28.044 28.048 28.052 28.056 28.060 28.063 28.067 713 28.071 28.075 28.079 28.083 28.087 28.091 28.095 28.099 28.103 28.107 714 28.111 28.115 28.119 28.123 28.126 28.130 28.134 28.138 28.142 28.146 715 28.150 28.154 28.158 28.162 28.166 28.170 28.174 28.178 28.182 28.186 716 28.189 28.193 28.197 28.201 28.205 28.209 28.213 28.217 28.221 28.225 717 28.229 28.233 28.237 28.241 28.245 28.249 28.252 28.256 28.260 28.264 718 28.268 28.272 28.276 28.280 28.284 28.288 28.292 28.296 28.300 28.304 719 28.308 28.312 28.315 28.319 28.323 28.327 28.331 28.335 28.339 28.343 O. 1. 2. 3. 4. 5. 6. 7. 8. 9. COMPARISON OF THE METRICAL AND ENGLISH BAROMETERS. & 1 Metre = 39.37079 English Inches. Tenths of Millimetres. Millime- tres. 0. 1. 2. 3. 4. 5. 6. •7. 8^ 9. Eng. In. Eng. In. Enff. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. 720 28.347 28.351 28.355 28.359 28.363 28.367 28.371 28.375 28.378 28.382 721 28.386 28.390 28.394 28.398 28.402 28.406 28.410 28.414 28.418 28.422 722 28.426 28.430 28.434 28.438 28.441 28.445 28.449 28.453 28.457 28.461 723 28.465 28.469 28.473 28.477 28.481 28.485 28.489 28.493 28.497 28.501 724 28.504 28.508 28.512 28.516 28.520 28.524 28.528 28.532 28.536 28.540 725 28.544 28.548 28.552 28.556 28.560 28.564 28.567 28.571 28.575 28.579 726 28.583 28.587 28.591 28.595 28.599 28.603 28.607 28.611 28.615 28.619 727 28.623 28.627 28.630 28.634 28.638 28.642 28.646 28.650 28.654 28.658 728 28.662 28.666 28.670 28.674 28.678 28.682 28.686 28.689 28.693 28.697 729 28.701 28.705 28.709 28.713 28.717 28.721 28.725 28.729 28.733 28.737 730 28.741 28.745 28.749 28.752 28.756 28.760 28.764 28.768 28.772 28.776 731 28.780 28.784 28.788 28.792 28.796 28.800 28.804 28.808 28.812 28.815 732 28.819 28.823 28.827 28.831 28.835 28.839 28.843 28.847 28.851 28.855 733 28.859 28.863 28.867 28.871 28.875 28.878 28.882 28.886 28.890 28.894 734 28.898 28.902 28.906 28.910 28.914 28.918 28.922 28.926 28.930 28.934 735 28.938 28.941 28.945 28.949 28.953 28.957 28.961 28.965 28.969 28.973 736 28.977 28.981 28.985 28.989 28.993 28.997 29.001 29.004 29.008 29.012 737 29.016 29.020 29.024 29.028 29.032 29.036 29.040 29.044 29.048 29.052 738 29.056 29.060 29.064 29.067 29.071 29.075 29.079 29.083 29.087 29.091 739 29.095 29.099 29.103 29.107 29.111 29.115 29.119 29.123 29.127 29.130 740 29.134 29.138 29.142 29.146 29.150 29.154 29.158 29.162 29.166 29.170 741 29.174 29.178 29.182 29.186 29.190 29.193 29.197 29.201 29.205 29.209 742 29.213 29.217 29.221 29.225 29.229 29.233 29.237 29.241 29.245 29.249 743 29.252 29.256 29.260 29.264 29.268 29.272 29.276 29.280 29.284 29.288 744 29.292 29.296 29.300 29.304 29.308 29.312 29.315 29.319 29.323 29.327 745 29.331 29.335 29.339 29.343 29.347 29.351 29.355 29.359 29.363 29.367 746 29.371 29.375 29.378 29.382 29.386 29.390 29.394 29.398 29.402 29.406 747 29.410 29.414 29.418 29.422 29.426 29.430 29.434 29.438 29.441 29.445 748 29.449 29.453 29.457 29.461 29.465 29.469 29.473 29.477 29.481 29.485 749 29.489 29.493 29.497 29.501 29.504 29.508 29.512 29.516 29.520 29.524 750 29.528 29.532 29.536 29.540 29.544 29.548 29.552 29.556 29.560 29.564 751 29.567 29.571 29.575 29.579 29.583 29.587 29.591 29.595 29.599 29.603 752 29.607 29.611 29.615 29.619 29.623 29.627 29.630 29.634 29.638 29.642 753 29.646 29.650 29.654 29.658 29.662 29.666 29.670 29.674 29.678 29.682 754 29.686 29.690 29.693 29.697 29.701 29.705 29.709 29.713 29.717 29.721 755 29.725 29.729 29.733 29.737 29.741 29.745 29.749 29.753 29.756 29.760 756 29.764 29.768 29.772 29.776 29.780 29.784 29.788 29.792 29.796 29.800 757 29.804 29.808 29.812 29.815 29.819 29.823 29.827 29.831 29.835 29.839 758 29.843 29.847 29.851 29.855 29.859 29.863 29.867 29.871 29.875 29.878 759 29.882 29.886 29.890 29.894 29.898 29.902 29.906 29.910 29.914 29.918 0. 1. 2. 3. 4. 5. 6. 7. §. 9. 25 COMPARISON OF THE METRICAL AND ENGLISH BAROMETERS. 1 Metre = 39.37079 English Inches. Tenths of Millimetres. Millime- tres. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Eng. In. Eng. In. Eng. In. Eng In. Eng. In. Eng. In. Eng. In. Eng. In Eng. In. Eng. In. 760 29.922 29.926 29.930 29.934 29.938 29.941 29.945 29.949 29.953 29.957 761 29.961 29.965 29.969 29.973 29.977 29.981 29.985 29.989 29.993 29.997 762 30.001 30.004 30.008 30.012 30.016 30.020 30.024 30.028 30.032 30.036 763 30.040 30.044 30.048 30.052 30.056 30.060 30.064 30.067 30.071 30 075 764 30.079 30.083 30.087 30.091 30.095 30.099 30.103 30.107 30.111 30.115 765 30.119 30.123 30.127 30.130 30.134 30.138 30.142 30.146 30.150 30.154 766 30.158 30.162 30.166 30.170 30.174 30.178 30.182 30.186 30.190 30.193 767 30.197 30.201 30.205 30.209 30.213 30.217 30.221 30.225 30.229 30.233 768 30.237 30.241 30.245 30.249 30.253 30.256 30.260 30.264 30.268 30.272 769 30.276 30.280 30.284 30.288 30.292 30.296 30.300 30.304 30.308 30.312 770 30.316 30.319 30.323 30.327 30.331 30.335 30.339 30.343 30.347 30.351 771 30.355 30.359 30.363 30.367 30.371 30.375 30.379 30.382 30.386 30.390 772 30.394 30.398 30.402 30.406 30.410 30.414 30.418 30.422 30.426 30.430 773 30.434 30.438 30.441 30.445 30.449 30.453 30.457 30.461 30.465 S0.469 774 30.473 30.477 30.481 30.485 30.489 30.493 30.497 30.501 30.504 30.508 775 30.512 30.516 30.520 30.524 30.528 30.532 30.536 30.540 30.544 30.548 776 30.552 30.556 30.560 30.564 30.567 30.571 30.575 30.579 30.583 30.587 777 30.591 30.595 30.599 30.603 30.607 30.611 30.615 30.619 30.623 30.627 778 30.630 30.634 30.638 30.642 30.646 30.650 30.654 30.658 30.662 30.666 779 30.670 30.674 30.678 30.682 30.686 30.690 30.693 30.697 30.701 30.705 780 30.709 30.713 30.717 30.721 30.725 30.729 30.733 30.737 30.741 30.745 781 30.749 30.753 30.756 30.760 30.764 30.768 30.772 30.776 30.780 30.784 782 30.788 30.792 30.796 30.800 30.804 30.808 30.812 30.816 30.819 30.823 783 30.827 30.831 30.835 30.839 30.843 30.847 30.851 30.855 30.859 30.863 784 30.867 30.871 30.875 30.879 30.882 30.886 30.890 30.894 30.898 30.902 785 30.906 30.910 30.914 30.918 30.922 30.926 30.930 30.934 30.938 30.942 786 30.945 30.949 30.953 30.957 30.961 30.965 30.969 30.973 30.977 30.981 787 30.985 30.989 30.993 30.997 31.001 31.004 31.008 31.012 31.016 31.020 788 31.024 31.028 31.032 31.036 31.040 31.044 31.048 31.052 31.056 31.060 789 31.064 31.067 31.071 31.075 31.079 31.083 31.087 31.091 31.095 31.099 790 31.103 31.107 31.111 31.115 31.119 31.123 31.127 31.130 31.134 31.138 791 31.142 31.146 31.150 31.154 31.158 31.162 31.166 31.170 31.174 31.178 792 31.182 31.186 31.190 31.193 31.197 31.201 31.205 31.209 31.213 31.217 793 31.221 31.225 31.229 31.233 31.237 31.241 31.245 31.249 31.253 31.256 994 31.260 31.264 31.268 31.272 31.276 31.280 31.284 31.288 31.292 31.296 795 31.300 31.304 31.308 31.312 31.316 31.319 31.323 31.327 31.331 31.335 796 31.339 31.343 31.347 31.351 31.355 31.359 31.363 31.367 31.371 31.375 797 31.379 31.382 31.386 31.390 31.394 31.398 31.402 31.406 31.410 31.414 798 31.418 31.422 31.426 31.430 31.434 31.438 31.442 31.445 31.449 31.453 799 31.457 31.461 31.465 31.469 31.473 31.477 31.481 31.485 31.489 31.493 800 31.497 31.501 31.505 31.508 31.512 31.516 31.520 31.524 31.528 31.532 Hundredths of Millimetres. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. .0000 .0004 .0008 .0012 .0016 .0020 .0024 .0028 .0031 .0035 26 IV. COMPARISON OF THE METRICAL AND OLD FRENCH BAROMETERS. 1 Millimetre = 0.443296 French or Paris Line. Millimetres. Units. Millimetres. Tens. o. 1. 2. 3. 4. 5. 6. 7. 8. 9. 300 Par.lines. 132.99 Par.lines 133.43 Par.lines. 133.88 Par.lines 134.32 Par.lines. 134.76 Par.lines. 135.21 Par .lines. 135. t)5 Par.lines. 136.09 Par.lines. 136-54 Par.lines. 136.98 310 137.42 137.87 138.31 138.75 139.19 139.64 140.08 140.52 140.97 141.41 320 141.85 142.30 142.74 143.18 143.63 144.07 144.51 144.96 145.40 145.84 330 146.29 146.73 147.17 147.62 148.06 148.50 148.95 149.39 149.83 150.28 340 150.72 151.16 151.61 152.05 152.49 152.94 153.38 153.82 154.27 154.71 350 155.15 155.60 156.04 156.48 156.93 157.37 157.81 158.26 158.70 159.14 360 159.59 160.03 160.47 160.92 161.36 161.80 162.25 162.69 163.13 163.58 370 164.02 164.46 164.91 165.35 165.79 166.24 166.68 167.12 167.57 168.01 380 168.45 163.90 169.34 169.78 170.23 170.67 171.11 171.56 172.00 172.44 390 172.89 173.33 173.77 174.22 174.66 175.10 175.55 175.99 176.43 176.88 400 177.32 177.76 178.20 178.65 179.09 179.53 179.98 180.42 180.86 181.31 410 181.75 182.19 182.64 183.08 183.52 183.97 184.41 184.85 185.30 185.74 420 186.18 186.63 187.07 187.51 187.96 188.40 188.84 189.29 189.73 190.17 430 190.62 191.06 191.50 191.95 192.39 192.83 193.28 193.72 194.16 194.61 440 195.05 195.49 195.94 196.38 196.82 197.27 197.71 198.15 198.60 199.04 450 199.48 199.93 200.37 200.81 201.26 201.70 202.14 202.59 203.03 203.47 460 203.92 204.36 204.80 205.25 205.69 206.13 206.58 207.02 207.46 207.91 470 208.35 208.79 209.24 209.68 210.12 210.57 211.01 211.45 211.90 212.34 480 212.78 213.23 213.67 214.11 214.56 215.00 215.44 215.88 216.33 216.77 490 217.22 217.66 218.10 218.54 218.99 219.43 219.87 220.32 220.76 221.20 500 221.65 222.09 222.53 222.98 223.42 223.86 224.31 224.75 225.19 225.64 510 226.08 226.52 226.97 227.41 227.85 228.30 228.74 229.18 229.63 230.07 520 230.51 230.96 231.40 231.84 232.29 232.73 233.17 233.62 234.06 234.50 530 234.95 235.39 235.83 236.28 236.72 237.16 237.61 238.05 238.49 238.94 540 239.38 239.82 240.27 240.71 241.15 241.60 242.04 242.48 242.93 243.37 550 243.81 244.26 244.70 245.14 245.59 246.03 246.47 246.92 247.36 247.80 560 248.25 248.69 249.13 249.57 250.01 250.46 250.91 251.35 251.79 252.24 570 252.68 253.12 253.57 254.01 254.45 254.90 255.34 255.78 256.23 256.67 580 257.11 257.55 258.00 258.44 258.88 259.32 259.77 260.21 260.66 261.10 590 261.54 261.99 262.43 262.87 263.32 263.76 264.20 264.65 265.09 265.53 Tenths of Millimetres. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0.000 0.044 0.089 0.133 0.177 0.222 0.266 0.310 0.355 0.399 Hundredths of Millimetres. 0.000 0.004 0.009 0.013 0.018 0.022 0.027 0.031 0.035 0.040 27 COMPARISON OF THE METRICAL AND OLD FRENCH BAROMETERS. 1 Millimetre = 0.443296 French Line. Millime- Tenths of Millimetres. tres. 0. 1. 2. 3. 4. 5. 6. 7. §, 9. Par.lines. Par.lines. Par.lines. Par.lines. Par.lines. Par.lines. Par.lines. Par.lines. Par.lines. Par.lines. 600 265.98 266.02 266.07 266.11 266.15 266.20 266.24 266.29 266.33 266.38 601 266.42 266.47 266.51 266.55 266.60 266.64 266.69 266.73 266.78 266.82 602 266.86 266.91 266.95 267.00 267.04 267.09 267.13 267.17 267.22 267.26 603 267.31 267.35 267.40 267.44 267.48 267.53 267.57 267.62 267.66 267.71 604 267.75 267.80 267.84 267.88 267.93 267.97 268.02 268.06 268.11 268.15 605 268.19 268.24 268.28 268.33 268.37 268.42 268.46 268.50 268.55 268.59 606 268.64 268.68 268.73 268.77 268.81 268.86 268.90 268.95 268.99 269.04 607 269.08 269.13 269.17 269.21 269.26 269.30 269.35 269.39 269.44 269.48 608 269.52 269.57 269.61 269.66 269.70 269.75 269.79 269.83 269.88 269.92 609 269.97 270.01 270.06 270.10 270.14 270.19 270.23 270.28 270.32 270.37 610 270.41 270.45 270.50 270.54 270.59 270.63 270.68 270.72 270.77 270.81 611 270.85 270.90 270.94 270.99 271.03 271.08 271.12 271.16 271.21 271.25 612 271.30 271.34 271.39 271.43 271.47 271.52 271.56 271.61 271.65 271.70 613 271.74 271.78 271.83 271.87 271.92 271.96 272.01 272.05 272.10 272.14 614 272.18 272.23 272.27 272.32 272.36 272.41 272.45 272.49 272.54 272.58 615 272.63 272.67 272.72 272.76 272.80 272.85 272.89 272.94 272.98 273.03 616 273.07 273.11 273.16 273.20 273.25 273.29 273.34 273.38 273.42 273.47 617 273.51 273.56 273.60 273.65 273.69 273.74 273.78 273.82 273.87 273.91 618 273.96 274.00 274.05 274.09 274.13 274.18 274.22 274.27 274.31 274.36 619 274.40 274.44 274.49 274.53 274.58 274.62 274.67 274.71 274.75 274.80 620 274.84 274.89 274.93 274.98 275.02 275.07 275.11 275.15 275.20 275.24 621 275.29 275.33 275.38 275.42 275.46 275.51 275.55 275.60 275.64 275.69 622 275.73 275.77 275.82 275.86 275.91 275.95 276.00 276.04 276.08 276.13 623 276.17 276.22 276.26 276.31 276.35 276.38 276.44 276.48 276.53 276.57 624 276.62 276.66 276.71 276.75 276.79 276.84 276.88 276.93 276.97 277.02 625 277.06 277.10 277.15 277.19 277.24 277.28 277.33 277.37 277.41 277.46 626 277.50 277.55 277.59 277.64 277.58 277.72 277.77 277.81 277.86 277.90 627 277.95 277.99 278.04 278.08 278.12 278.17 278.21 278.26 278.30 278.35 628 278.39 278.43 278.48 278.52 278.57 278.61 278.66 278.70 278.74 278.79 629 278.83 278.88 278.92 278.97 279.01 279.05 279.10 279.14 279.19 279.23 630 279.28 279.32 279.37 279.41 279.45 279.50 279.54 279.59 279.63 279.68 631 279.72 279.76 279.81 279.85 279.90 279.94 279.99 280.03 280.07 280.12 632 280.16 280.21 280.25 280.30 280.34 280.38 280.43 280.47 280.52 280.56 633 280.61 280.65 280.70 280.74 280.78 280.83 280.87 280.92 280.96 281.01 634 281.05 281.09 281.14 281.18 281.23 281.27 281.32 281.36 281.40 281.45 635 281.49 281.54 281.58 281.63 281.67 281.71 281.76 281.80 281.85 281.89 636 281.94 281.98 282.02 282.07 282.11 282.16 282.20 282.25 282.29 282.34 637 282.38 282.42 282.47 282.51 282.56 282.60 282.65 282.69 282.73 282.78 638 282.82 282.87 282.91 282.96 283.00 283.04 283.09 283.13 283.18 283.22 639 283.27 283.31 283.35 283.40 283.44 283.49 283.53 283.58 283.62 283.67 0. 1. «. 3. <1. 5. 6. 7. 8. 9. i 28 COMPARISON OF THE METRICAL AND OLD FRENCH BAROMETERS. 1 Millimetre = 0.443296 French Line. Tenths of Millimetres. Millime- tres. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Par.lines. Par.lines. Par.lines. Par.lines. Par.lines. Par.lines Par.lines Par.lines. Par.lines Par.lines. 640 283.71 283.75 283.80 283.84 283.89 283.93 283.98 284.02 284.06 284.11 641 284.15 284.20 284.24 284.29 284.33 284.37 284.42 284.46 284.51 284.55 642 284.60 284.64 284.68 284.73 284.77 284.82 284.86 284.91 284.95 284.99 643 285.04 285.08 285.13 285.17 285.22 285.26 285.31 285.35 285.39 285.44 644 285.48 285.53 285.57 285.62 285.66 285.70 285.75 285.79 285.84 285.88 645 285.93 285.97 286.01 286.06 286.10 286.15 286.19 286.24 286.28 286.32 646 286.37 286.41 286.46 286.50 286.55 286.59 286.64 286.68 286.72 286.77 647 286.81 286.86 286.90 286.95 286.99 287.03 287.08 287.12 287.17 287.21 648 287.26 287.30 287.34 287.39 287.43 287.48 287.52 287.57 287.61 287.65 649 287.70 287.74 287.79 287.83 287.88 287.92 287.96 288.01 288.05 288.10 650 288.14 288.19 288.23 288.28 288.32 288.36 288.41 288.45 288.50 288.54 651 288.59 288.63 288.67 288.72 288.76 288.81 288.85 288.90 288.94 288.98 652 289.03 289.07 289.12 289.16 289.21 289.25 289.29 289.34 289.38 289.43 653 289.47 289.52 289.56 289.61 289.65 289.69 289.74 289.78 289.83 289.87 654 289.92 289.96 290.00 290.05 290.09 290.14 290.18 290.23 290.27 290.31 655 290.36 290.40 290.45 290.49 290.54 290.58 290.62 290.67 290.71 290.76 656 290.80 290.85 290.89 290.94 290.98 291.02 291.07 291.11 291.16 291.20 657 291.25 291.29 291.33 291.38 291.42 291.47 291.51 291.56 291.60 291.64 658 291.69 291.73 291.78 291.82 291.87 291.91 291.95 292.00 292.04 292.09 659 292.13 292.18 292.22 292.26 292.31 292.35 292.40 292.44 292.49 292.53 660 292.58 292.62 292.66 292.71 292.75 292.80 292.84 292.89 292.93 292.97 661 293.02 293.06 293.11 293.15 293.20 293.24 293.28 293.33 293.37 293.42 662 293.46 293.51 293.55 293.59 293.64 293.68 293.73 293.77 293.82 293.86 663 293.91 293.95 293.99 294.04 294.08 294.13 294.17 294.22 294.26 294.30 664 294.35 294.39 294.44 294.48 294.53 294.57 294.61 294.66 294.70 294.75 665 294.79 294.84 294.88 294.92 294.97 295.01 295.06 295.10 295.15 295.19 666 295.24 295.28 295.32 295.37 295.41 295.46 295.50 295.55 295.59 295.63 667 295.68 295.72 295.77 295.81 295.86 295.90 295.94 295.99 296.03 296.08 668 296.12 296.17 296.21 296.25 296.30 296.34 296.39 296.43 296.48 296.52 669 296.56 296.61 296.65 296.70 296.74 296.79 296.83 296.88 296.92 296.96 670 297.01 297.05 297.10 297.14 297.19 297.23 297.27 297.32 297.36 297.41 671 297.45 297.50 297.54 297.58 297.63 297.67 297.72 297.76 297.81 297.85 672 297.89 297.94 297.98 298.03 298.07 298.12 298.16 298.21 298.25 298.29 673 298.34 298.38 298.43 298.47 298.52 298.56 298.60 298.65 298.69 298.74 674 298.78 298.83 298.87 298.91 298.96 299.00 299.05 299.09 299.14 299.18 675 299.22 299.27 299.31 299.36 299.40 299.45 299.49 299.54 299.58 299.62 676 299.67 299.71 299.76 299.80 299.85 299.89 299.93 299.98 300.02 300.07 677 300.11 300.16 300.20 300.24 300.29 300.33 300.38 300.42 300.47 300.51 678 300.55 300.60 300.64 300.69 300.73 300.78 300.82 300.86 300.91 300.95 679 301.00 301.04 301.09 301.13 301.18 301.22 301.26 301.31 301.35 301.40 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 29 COMPARISON OF THE METRICAL AND OLD FRENCH BAROMETERS. 1 Millimetre = 0.443296 French line. Millime- Tenths of Millimetres. tres. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Par.lines Par.lines Par.lines Par.lines Par.lines Par.lines Par.lines Par.lines Par.lines Par.lines. 680 301.44 301.49 301.53 301.57 301.62 301.66 301.71 301.75 301.80 301.84 681 301.88 301.93 301.97 302.02 302.06 302.11 302.15 302.19 302.24 302.28 682 302.33 302.37 302.42 302.46 302.51 302.55 302.59 302.64 302.68 302.73 683 302.77 302.82 302.86 302.90 302.95 302.99 303.04 303.08 303.13 303.17 684 303.21 303.26 303.30 303.35 303.39 303.44 303.48 303.52 303.57 303.61 685 303.66 303.70 303.75 303.79 303.83 303.88 303.92 303.97 304.01 304.06 686 304.10 304.15 304.19 304.23 304.28 304.32 304.37 304.41 304.46 304.50 687 304.54 304.59 304.63 304.68 304,72 304.77 304.81 304.85 304.90 304.94 688 304.99 305.03 305.08 305.12 305.16 305.21 305.25 305.30 305.34 305.39 689 305.43 305.48 305.52 305.56 305.61 305.65 305.70 305.74 305.79 305.83 690 305.87 305.92 305.96 306.01 306.05 306.10 306.14 306.18 306.23 306.27 691 306.32 306.36 806.41 306.45 306.49 306.54 306.58 306.63 306.67 306.72 692 306.76 306.81 306.85 306.89 306.94 306.98 307.03 307.07 307.12 307.16 693 307.20 307.25 307.29 307.34 307.38 307.43 307.47 307.51 307.56 307.60 694 307.65 307.69 307.74 307.78 307.82 307.87 307.91 307.96 308.00 308.05 695 308.09 308.13 308.18 308.22 308.27 308.31 308.36 308.40 308.45 308.49 696 308.53 308.58 308.62 308.67 308.71 308.76 308.80 308.84 308.89 308.93 697 308.98 309.02 309.07 309.11 309.15 309.20 309.24 309.29 309.33 309.38 698 309.42 309.46 309.51 309.55 309.60 309.64 309.69 309.73 309.78 309.82 699 309.86 309.91 309.95 310.00 310.04 310.09 310.13 310.17 310.22 310.26 700 310.31 310.35 310.40 310.44 310.48 310.53 310.57 310.62 310.66 310.71 701 310.75 310.79 310.84 310.88 310.93 310.97 311.02 311.06 311.11 311.15 702 311.19 311.24 311.28 311.33 311.37 311.42 311.46 311.50 311.55 311.59 703 311.64 311.68 311.73 311.77 311.81 311.86 311.90 311.95 311.99 312.04 704 312.08 312.12 312.17 312.21 312.26 312.30 312.35 312.39 312.43 312.48 705 312.52 312.57 312.61 312.66 312.70 312.75 312.79 312.83 312.88 312.92 706 312.97 313.01 313.06 313.10 313.14 313.19 313.23 313.28 313.32 313.37 707 313.41 313.45 313.50 313.54 313.59 313.63 313.68 313.72 313.76 313.81 708 313.85 313.90 313.94 313.99 314.03 314.08 314.12 314.16 314.21 314.25 709 314.30 314.34 314.39 314.43 314.47 314.52 314.56 314.61 314.65 314.70 710 314.74 314.78 314.83 314.87 314.92 314.96 315.01 315.05 315.09 315.14 711 315.18 315.23 315.27 315.32 315.36 315.41 315.45 315.49 315.54 315.58 712 315.63 315.67 315.72 315.76 315.80 315.85 315.89 315.94 315.98 316.03 713 316.07 316.11 316.16 316.20 316.25 316.29 316.34 316.38 316.42 316.47 714 316.51 316.56 316.60 316.65 316.69 316.73 316.78 316.82 316.87 316.91 715 316.96 317.00 317.05 317.09 317.13 317.18 317.22 317.27 317.31 317.36 716 317.40 317.44 317.49 317.53 317.58 317.62 317.67 317.71 317.75 317.80 717 317.84 317.89 317.93 317.98 318.02 318.06 318.11 318.15 318.20 318.24 718 318.29 318.33 318.38 318.42 318.46 318.51 318.55 318.60 318.64 318.69 719 318.73 318.77 318.82 318.86 318.91 318.95 319.00 319.04 319.08 319.13 0. 1. 2. 3. 4. 5. 6. 7. | 8. 9. 30 COMPARISON OF THE METRICAL AND OLD FRENCH BAROMETERS. 1 Millimetre = 0.443296 French Line. Millime- Tenths of Millimetres. tres. o. 1. 2. 3. 4. 5. 6. 7. 8» 9. Par.lines. Par.lines. Par.lines Par.lines Par.lines. Par.lines. Par.lines Par.lines. Par.lines Par.lines. 720 319.17 319.22 319.26 319.31 319.35 319.39 319.44 319.48 319.53 319.57 721 319.62 319.66 319.70 319.75 319.79 319.84 319.88 319.93 319.97 320.02 722 320.06 320.10 320.15 320.19 320.24 320.28 320.33 320.37 320.41 320.46 723 320.50 320.55 320.59 320.64 320.68 320.72 320.77 320.81 320.86 320.90 724 320.95 320.99 321.03 321.08 321.12 321.17 321.21 321.26 321.30 321.35 725 321.39 321.43 321.48 321.52 321.57 321.61 321.66 321.70 321.74 321.79 726 321.83 321.88 321.92 321.97 322.01 322.05 322.10 322.14 322.19 322.23 727 322.28 322.32 322.36 322.41 322.45 322.50 322.54 322.59 322.63 322.68 728 322.72 322.76 322.81 322.85 322.90 322.94 322.99 323.03 323.07 323.12 729 323.16 323.21 323.25 323.30 323.34 323.38 325.43 323.47 323.52 323.56 730 323.61 323.65 323.69 323.74 323.78 323.83 323.87 323.92 323.96 324.00 731 324.05 324.09 324.14 324.18 324.23 324.27 324.32 324.36 324.40 324.45 732 324.49 324.54 324.58 324.63 324.67 324.71 324.76 324.80 324.85 324.89 733 324.94 324.98 325.02 325.07 325.11 325.16 325.20 325.25 325.29 325.33 734 325.38 325.42 325.47 325.51 325.56 325.60 325.65 325.69 325.73 325.78 735 325.82 325.87 325.91 325.96 326.00 326.04 326.09 326.13 326.18 326.22 736 326.27 326.31 326.35 326.40 326.44 326.49 326.53 326.58 326.62 326.66 737 326.71 326.75 326.80 326.84 326.89 326.93 326.98 327.02 327.06 327.11 738 327.15 327.20 327.24 327.29 327.33 327.37 327.42 327.46 327.51 327.55 739 327.60 327.64 327.68 327.73 327.77 327.82 327.86 327.91 327.95 327.99 740 328.04 328.08 328.13 328.17 328.22 328.26 328.30 328.35 328.39 32S.44 741 328.48 328.53 328.57 328.62 328.66 328.70 328.75 328.79 328.84 328.88 742 328.93 328.97 329.01 329.06 329.10 329.15 329.19 329.24 329.28 329.32 743 329.37 329.41 329.46 329.50 329.55 329.59 329.63 329.68 329.72 329.77 744 329.81 329.86 329.90 329.95 329.99 330.03 330.08 330.12 330.17 330.21 745 330.26 330.30 330.34 330.39 330.43 330.48 330.52 330.57 330.61 330.65 746 330.70 330.74 330.79 330.83 330.88 330.92 330.96 331.01 331.05 331.10 747 331.14 331.19 331.23 331.28 331.32 331.36 331.41 331.45 331.50 331.54 748 331.59 331.63 331.67 331.72 331.76 331.81 331.85 331.90 331.94 331.98 749 332.03 332.07 332.12 332.16 332.21 332.25 332.29 332.34 332.38 332.43 750 332.47 332.52 332.56 332.60 332.65 332.69 332.74 332.78 332.83 332.87 751 332.92 332.96 333.00 333.05 333.09 333.14 333.18 333.23 333.27 333.31 752 333.36 333.40 333.45 333.49 333.54 333.58 333.62 333.67 333.71 333.76 753 333.80 333.85 333.89 333.93 333.98 334.02 384.07 334.11 334.16 334.20 754 334.25 334.29 334.33 334.38 334.42 334.47 334.51 334.56 334.60 334.64 755 334.69 334.73 334.78 334.82 334.87 334.91 334.95 335.00 335.04 335.09 756 335.13 335.18 335.22 335.26 335.31 335.35 335.40 335.44 335.49 335.53 757 335.58 335.62 335.66 335.71 335.75 335.80 335.84 335.89 335.93 335.97 758 336.02 336.06 336.11 336.15 336.20 336.24 336.28 336.33 336.37 336.42 759 336.46 336.51 336.55 336.59 3M6.64 336.68 336.73 336.77 336.82 336.86 0. 1. 2. 3. 4. 5. 6. •7. 8. 9. 31 COMPARISON OF THE METRICAL AND OLD FRENCH BAROMETERS. 1 Millimetre = 0.443296 French Line Tenths of Millimetres. Millime- tres. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Par.lines. Par.lines. Par.lines. Par.lines. Par.lines. Par.lines. Par.lines. Par.lines. Par .lines. Par.lines. 760 336.90 336.95 336.99 337.04 337.08 337.13 337.17 337.22 337.26 337.30 761 337.35 337.39 337.44 337.48 337.53 337.57 337.61 337.66 337.70 337.75 762 337.79 337.84 337.88 337.92 337.97 338.01 338.06 338.10 338.15 338.19 763 338.23 338.28 338.32 338.37 338.41 338.46 338.50 338.55 338.59 338.63 764 338.68 338.72 338.77 338.81 338.86 338.90 338.94 338.99 339.03 339.08 765 339.12 339.17 339.21 339.25 339.30 339.34 339.39 339.43 339.48 339.52 766 339.56 339.61 339.65 339.70 339.74 339.79 339.83 339.87 339.92 339.96 767 340.01 340.05 340.10 340.14 340.19 340.23 340.27 340.32 340.36 340.41 768 340.45 340.50 340.54 340.58 340.63 340.67 340.72 340.76 340.81 340.85 769 340.89 340.94 340.98 341.03 341.07 341.12 341.16 341.20 341.25 341.29 770 341.34 341.38 341.43 341.47 341.52 341.56 341.60 341.65 341.69 341.74 771 341.78 341.83 341.87 341.91 341.96 342.00 342.05 342.09 342.14 342.18 772 342.22 342.27 342.31 342.36 342.40 342.45 342.49 342.53 342.58 342.62 773 342.67 342.71 342.76 342.80 342.85 842.89 342.93 342.98 343.02 343.07 774 343.11 343.16 343.20 343.24 343.29 343.33 343.38 343.42 343.47 343.51 775 343.55 343.60 343.64 343.69 343.73 343.78 343.82 343.86 343.91 343.95 776 314.00 344.04 344.09 344.13 344.17 344.22 344.26 344.31 344.35 344.40 777 344.44 344.49 344.53 344.57 344.62 344.66 344.71 344.75 344.80 344.84 778 344.88 344.93 344.97 345.02 345.06 345.11 345.15 345.19 345.24 345.28 779 345.33 345.37 345.42 345.46 345.50 345.55 345.59 345.64 345.68 345.73 780 345.77 345.82 345.86 345.90 345.95 345.99 346.04 346.08 346.13 346.17 781 346.21 346.26 346.30 346.35 346.39 346.44 346.48 346.52 346.57 346.61 782 346.66 346.70 346.75 346.79 346.83 346.88 346.92 346.97 347.01 347.06 783 347.10 347.15 347.19 347.23 347.28 347.32 347.37 347.41 347.46 347.50 784 347.54 347.59 347.63 347.68 347.72 347.77 347.81 347.85 347.90 347.94 ' 785 347.99 348.03 348.08 348.12 348.16 348.21 348.25 348.30 348.34 348.39 786 348.43 348.47 348.52 348.56 348.61 348.65 348.70 348.74 348.79 348.83 787 348.87 348.92 348.96 349.01 349.05 349.10 349.14 349.18 349.23 349.27 788 349.32 349.36 349.41 349.45 349.49 349.54 349.58 349.63 349.67 349.72 789 349.76 349.80 349.85 349.89 349.94 349.98 350.03 350.07 350.12 350.16 790 350.20 350.25 350.29 350.34 350.38 350.43 350.47 350.51 350.56 350.60 791 350.65 350.69 350.74 350.78 350.82 350.87 350.91 350.96 351.00 351.05 792 351.09 351.13 351.18 351.22 351.27 351.31 351.36 351.40 351.44 351.49 793 351.53 351.58 351.62 351.67 351.71 351.76 351.80 351.84 351.89 351.93 794 351.98 352.02 352.07 352.11 352.15 352.20 352.24 352.29 352.33 352.38 795 352.42 352.46 352.51 352.55 352.60 352.64 352.69 352.73 352.77 352.82 796 352.86 352.91 352.95 353.00 353.04 353.09 353.13 353.17 353.22 353.26 797 353.31 353.35 353.40 353.44 3«*3.48 353.53 353.57 353.62 353.66 353.71 798 353.75 353.79 353.84 353.88 353.93 353.97 354.02 354.06 354.10 354.15 799 354.19 354.24 354.28 354.33 354.37 354.42 354.46 354.50 354.55 354.59 800 354.64 354.68 354.73 354.77 354.81 354.86 354.90 354.95 354.99 355.04 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. V.-VI. COMPARISON OF THE OLD FRENCH BAROMETER THE ENGLISH AND THE METRICAL BAROMETERS, OR TABLES FOR CONVERTING FRENCH OR PARIS LINES INTO ENGLISH INCHES AND DECIMALS, AND INTO MILLIMETRES ; % GIVING THE VALUES CORRESPONDING TO EVERY PARIS LINE FROM 120 TO 216 LINES, OR FROM 10 TO 18 INCHES ; AND TO EVERY TENTH OF A LINE FROM 216 TO 348 LINES, OR FROM 18 TO 29 FRENCH INCHES. 33 TABLE V. MM. J. J. Pohl and J. Schabus have published, in the number for March, 1852, of the Proceedings of the Imperial Academy of Vienna, Class of Mathematics and Natural Philosophy, a set of short Thermometrical and Barometrical Reduction Tables, among which is found a table for the reduction of the Old French Baro- metrical Scale into the English. As this table shows slight discrepancies from the one given in the following pages, it may not be out of place to state that they arise from an 'accidental error in the equation used by MM. Pohl and Schabus in com- puting their table. Adopting, as they do, Bird's value of the metre, viz. 1 metre = 39.37062 English inches, the value of the Paris line is - • • • 1 Paris line = 0.088813 English inches. But the table seems to have been computed by using the equation 1 Paris line = 0.088823 English inches, which gives, at the end of the table, 348 lines x .088823 = 30.9104 English inches, instead of 348 " x .088813 = 30.9069 " thus causing an error = 0.0035 " u which, of course, gradually diminishes in lower numbers. I V. COMPARISON OF THE OLD FRENCH AND ENGLISH BAROMETERS. 1 Paris Line = 0.088814 English Inch. French or Paris Lines. Tens. Units. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. i 10 Inch. 120 Eng. In. 10.658 Eng In. 10.746 Eng. In. 10.835 Eng. In. 10.924 Eng In 11.013 Eng. In. 11.102 Eng. In. 11.191 Eng. In. 11.279 Eng. In. 11.368 Eng. In. 11.457 130 11.546 11.635 11.723 11.812 11.901 11.990 12.079 12.168 12.256 12.345 140 12.434 12.523 12.612 12.700 12.789 12.878 12.967 13.056 13.144 13.233 150 13.322 13.411 13.500 13.589 13.677 13.766 13.855 13.944 14.033 14.121 160 14.210 14.299 14.388 14.477 14.565 14.654 14.74-3 14.832 14.921 15.010 170 15.098 15.187 15.276 15.365 15.454 15.542 15.631 15.720 15.809 15.898 130 15.987 16.075 16.164 16.253 16.342 16.431 16.519 16.608 16.697 16.786 190 16.875 16.963 17.052 17.141 17.230 17.319 17.408 17.496 17.585 17.674 200 17.763 17.852 17.940 18.029 18.118 18.207 18.296 18.384 18.473 18.562 210 18.651 18.740 18.829 18.917 19.006 19.095 19.184 19.273 19.361 19.450 Paris Lines. Tenths. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 18 Inch. 216 Eng. In. 19.184 Eng. In. 19.193 Eng. In. 19.202 Eng In. 19.210 Eng. In. 19.219 Eng. In. 19.228 Eng. In. 19.237 Eng. In. 19.246 Eng. In. 19.255 .Eng. In 19.264 217 19.273 19.282 19.290 19.299 19.308 19.317 19.326 19.335 19.344 19.353 218 19.361 19.370 19.379 19.388 19.397 19.406 19.415 19.424 19.433 19.441 219 19.450 19.459 19.468 19.477 19.486 19.495 19.504 19.512 19.521 19.530 220 19.539 19.548 19.557 19.566 19.575 19.583 19.592 19.601 19.610 19.619 221 19.623 19.637 19.646 19.655 19.663 19.672 19.681 19.690 19.699 19.708 222 19.717 19.726 19.734 19.743 19.752 19.761 19.770 19.779 19.788 19.797 223 19.806 19.814 19.823 19.832 19.840 19.850 19.859 19.868 19.877 19.885 224 19.894 19.903 19.912 19.921 19.930 19.939 19.948 19.957 19.965 19.974 225 19.983 19.992 20.001 20.010 20.019 20.028 20.036 20.045 20.054 20.063 226 20.072 20.081 20.090 20.099 20.107 20.116 20.125 20.134 20.143 20.152 227 20.161 20.170 20.179 20.187 20.196 20.205 20.214 20.223 20.232 20.241 19 Inch. 228 20.250 20.258 20.267 20.276 20.285 20.294 20.303 20.312 20.321 20.530 229 20.338 20.347 20.356 20.365 20.374 20.383 20.392 20.401 20.409 20.418 230 20.427 20.436 20.445 20.454 20.463 20.472 20.481 20.489 20.498 20.507 231 20.516 20.525 20.534 20.543 20.552 20.560 20.569 20.578 20.587 20.596 232 20.605 20.614 20.623 20.631 20.640 20.649 20.658 20.667 20.676 20.685 233 20.694 20.703 20.711 20.720 20.729 20.738 20.747 20.756 20.765 20.774 234 20.782 20.791 20.800 20.809 20.818 20.827 20.836 20.845 20.854 20.862 235 20.871 20.880 20.889 20.898 20.907 20.916 20.925 20.933 20.942 20.951 236 20.960 20.969 20.978 20.987 20.996 21.005 21.013 21.022 21.031 21.040 237 21.049 21.058 21.067 21.076 21.084 21.093 21.102 21.111 21.120 21.129 238 21.133 21.147 21.155 21.164 21.173 21.182 21.191 21.200 21.209 21.218 239 21.227 21.235 21.244 21.253 21.262 21.271 21.230 21.289 21.298 21.306 Hundredths of a Line. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. .000 .001 .002 1 .003 .C04 .004 .005 .006 .007 .008 35 COMPARISON OF THE OLD FRENCH AND ENGLISH BAROMETERS. 1 Paris Line = 0.088814 English Inch. Tenths -of a Line. French or ParisLines 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. «0 Inches Eng. In. Eng. In. Eng. In Eng. In. Eng. In. Eng. In. Eng. In Eng. In Eng. In. Eng. In. 240 21.315 21.324 21.333 21.342 21.351 21.360 21.369 21.378 21.386 21.395 241 21.404 21.413 21.422 21.431 21.440 21.449 21.457 21.466 21.475 21.484 242 21.493 21.502 21.511 21.520 21.529 21.537 21.546 21.555 21.564 21.573 243 21.582 21.591 21.600 21.608 21.617 21.626 21.635 21.644 21.653 21.662 244 21.671 21.679 21.688 21.697 21.706 21.715 21.724 21.733 21.742 21.751 245 21.759 21.768 21.777 21.786 21.795 21.804 21.813 21.822 21.830 21.839 246 21.848 21.857 21.866 21.875 21.884 21.893 21.902 21.910 21.919 21.928 247 21.937 21.946 21.955 21.964 21.973 21.981 21.990 21.999 22.008 22.017 248 22.026 22.035 22.044 22.053 22.061 22.070 22.079 22.088 22.097 22.106 249 22.115 22.124 22.132 22.141 22.150 22.159 22.168 22.177 22 186 22.195 250 22.203 22.212 22.221 22.230 22.239 22.248 22.257 22.266 22.275 22.283 251 22.292 22.301 22.310 22.319 22.328 22.337 22.346 22.354 22.363 22.372 21 In. == 252 22.381 22.390 22.399 22.408 22.417 22.426 22.434 22.443 22.452 22.461 253 . 22.470 22.479 22.488 22.497 22.505 22.514 22.523 22.532 22.541 22.550 254 22.559 22.568 22.577 22.585 22.594 22.603 22.612 22.621 22.630 22.639 255 22.648 22.656 22.665 22.674 22.683 22.692 22.701 22.710 22.719 22.728 256 22.736 22.745 22.754 22.763 22.772 22.781 22.790 22.799 22.807 22.816 257 22.825 22.834 22.843 22.852 22.861 22.870 22.878 22.887 22.896 22.905 258 22.914 22.923 22.932 22.941 22.950 22.958 22.967 22.976 22.985 22.994 259 23.003 23.012 23.021 23.029 23.038 23.047 23.056 23.065 23.074 23.083 260 23.092 23.101 23.109 23.118 23.127 23.136 23.145 23.154 23.163 23.172 261 23.180 23.189 23.198 23.207 23.216 23.225 23.234 23.243 23.252 23.260 262 23.269 23.278 23.287 23.296 23.305 23.314 23.323 23.331 23.340 23.349 263 23.358 23.367 23.376 23.385 23.394 23.402 23.411 23.420 23.429 23.438 aain. = ' 264 23.447 23.456 23.465 23.474 23.482 23.491 23.500 23.509 23.518 23.527 265 23.536 23.545 23.553 23.562 23.571 23.580 23.589 23.598 23.607 23.616 266 23.625 23.633 23.642 23.651 23.660 23.669 23.678 23.687 23.696 23.704 267 23.713 23.722 23.731 23.740 23.749 23.758 23.767 23.776 23.784 23.793 268 23.802 23.811 23.820 23.829V 23.838 23.847 23.855 23.864 23.873 23.882 269 23.891 23.900 23.909 23.918 23.926 23.935 23.944 23.953 23.962 23.971 270 23.980 23.989 23.998 24.006 24.015 24.024 24.033 24.042 24.051 24.060 271 24.069 24.077 24.086 24.095 24.104 24.113 24.122 24.131 24.140 24.149 272 24.157 24.166 24.175 24.184 24.193 24.202 24.211 24.220 24.228 24.237 273 24.246 24.255 24.264 24.273 24.282 24.291 24.300 24.308 24.317 24.326 274 24.335 24.344 24.353 24.362 24.371 24.379 24.388 24.397 24.406 24.415 275 24.424 24.433 24.442 24.450 24.459 24.468 24.477 24.486 24.495 24.504 Hundredths of a Line. o. 1. 2. 3. 4. 5. 6. 7. 8. 9. .0000 .0009 .0018 .0027 .0036 .0044 .0053 .0062 .0071 .0080 36 COMPARISON OF THE OLD FRENCH AND ENGLISH BAROMETERS. 1 Paris Line = 0.088814 English Inch. French or ParisLines. Tenths of a Line. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 33 Inches. 276 Eng. In. 24.513 Eng. In. 24.522 Eng. In. 24.530 Eng. In. 24.539 Eng. In. 24.548 Eng. In. 24.557 Eng. In. 24.566 Eng. In. 24.575 Eng. In. 24.584 Eng. In. 24.593 277 24.601 24.610 24.619 24.628 24.637 24.646 24.655 24.664 24.673 24.681 278 24.690 24.699 24.708 24.717 24.726 24.735 24.744 24.752 24.761 24.770 279 24.779 24.788 24.797 24.806 24.815 24.824 24.832 24.841 24.850 24.859 280 24.868 24.877 24.886 24.895 24.903 24.912 24.921 24.930 24.939 24.948 281 24.957 24.966 24.974 24.983 24.992 25.001 25.010 25.019 25.028 25.037 282 25.046 25.054 25.063 25.072 25.081 25.090 25.099 25.108 25.117 25.125 283 25.134 25.143 25.152 25.161 25.170 25.179 25.188 25.197 25.205 25.214 284 25.223 25.232 25.241 25.250 25.259 25.268 25.276 25.285 25.294 25.303 285 25.312 25.321 25.330 25.339 25.348 25.356 25.365 25.374 25.383 25.392 286 25.401 25.410 25.419 25.427 25.436 25.445 25.454 25.463 25.472 25.481 287 25.490 25.498 25.507 25.516 25.525 25.534 25.543 25.552 25.561 25.570 a* in. = 288 25.578 25.587 25.596 25.605 25.614 25.623 25.632 25.641 25.649 25.658 289 25.667 25.676 25.685 25.694 25.703 25.712 25.721 25.729 25.738 25.747 290 25.756 25.765 25.774 25.783 25.792 25.800 .25.809 25.818 25.827 25.836 291 25.845 25.854 25.863 25.872 25.880 25.889 25.898 25.907 25.916 25.925 292 25.934 25.943 25.951 25.960 25.969 25.978 25.987 25.996 26.005 26.014 293 26.023 26.031 26.040 26.049 26.058 26.067 26.076 26.085 26.094 26.102 294 26.111 26.120 26.129 26.138 26.147 26.156 26.165 26.173 26.182 26.191 295 26.200 26.209 26.218 26.227 26.236 26.245 26.253 26.262 26.271 26.280 296 26.289 26.298 26.307 26.316 26.324 26.333 26.342 26.351 26.360 26.369 297 26.378 26.387 26.396 26.404 26.413 26.422 26.431 26.440 26.449 26.458 298 26.467 26.475 26.484 26.493 26.502 26.511 26.520 26.529 26.538 26.547 299 26.555 26.564 26.573 26.582 26.591 26.600 26.609 26.618 26.626 26.635 35 In. = 300 26.644 26.653 26.662 26.671 26.680 26.689 26.697 26.706 26.715 26.724 301 26.733 26.742 26.751 26.760 26.769 26.777 26.786 26.795 26804 26.813 302 26.822 26.831 26.840 26.848 26.857 26.866 26.875 26.884 26.893 26.902 303 26.911 26.920 26.928 26.937 26.946 26.955 26.964 26.973 26.982 26.991 304 26.999 27.008 27.017 27.026 27.035 27.044 27.053 27.062 27.071 27.079 305 27.088 27.097 27.106 27.115 27.124 27.133 27.142 27.150 27.159 27.168 306 27.177 27.186 27.195 27.204 27.213 27.221 27.230 27.239 27.248 27.257 307 27.266 27.275 27.284 27.293 27.301 27.310 27.319 27.328 27.337 27.346 308 27.355 27.364 27.372 27.381 27.390 27.399 27.408 27.417 27.426 27.435 309 27.444 27.452 27.461 27.470 27.479 27.488 27.497 27.506 27.515 27.523 310 27.532 27.541 27.550 27.559 27.568 27.577 27.586 27.595 27.603 27.612 311 27.621 27.630 27.639 27.648 27.657 27.666 27.674 27.683 27.692 27.701 Hundredths of a Line. 0. 1. 2. 3. 4. 5. | 6. 7. 8. 9. .0000 .0009 .0018 .0027 .0036 .0044 .0053 .0062 .0071 .0080 37 COMPARISON OF THE OLD FRENCH AND ENGLISH BAROMETERS. 1 Paris Line = 0.088814 English Inch. Tenths of a Line. French or ParisLines. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 36 Inches. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. 312 27.710 27.719 27.728 27.737 27.745 27.754 27.763 27.772 27.781 27.790 313 27.799 27.808 27.817 27.825 27.834 27.843 27.852 27.861 27.870 27.879 314 27.888 27.896 27.905 27.914 27.923 27.932 27.941 27.950 27.959 27.968 315 27.976 27.985 27.994 28.003 28.012 28.021 28.030 28.039 28.047 28.056 316 28.065 28.074 28.083 28.092 28.101 28.110 28.119 28.127 28.136 28.145 317 28.154 28.163 28.172 28.181 28.190 28.198 28.207 28.216 28.225 28.234 318 28.243 28.252 28.261 28.269 28.278 28.287 28.296 28.305 28.314 28.323 319 28.332 28.341 28.349 28.358 28.367 28.376 28.385 28.394 28.403 28.412 320 28.420 28.429 28.438 28.447 28.456 28.465 28.474 28.483 28.492 28.500 321 28.509 28.518 28.527 28.536 28.545 28.554 28.563 28.571 28.580 28.589 322 28.598 28.607 28.616 28.625 28.634 28.643 28.651 28.660 28.669 28.678 323 28.687 28.696 28.705 28.714 28.722 28.731 28.740 28.749 28.758 28.767 37 In. = 324 28.776 28.785 28.793 28.802 28.811 28.820 28.829 28.838 28.847 28.856 325 28.865 28.873 28.882 28.891 28.900 28.909 28.918 28.927 28.936 28.944 326 28.953 28.962 28.971 28.980 28.989 28.998 29.007 29.016 29.024 29.033 327 29.042 29.051 29.060 29.069 29.078 29.087 29.095 29.104 29.113 29.122 328 29.131 29.140 29.149 29.158 29.167 29.175 29.184 29.193 29.202 29.211 329 29.220 29.229 29.238 29.246 29.255 29.264 29.273 29.282 29.291 29.300 330 29.309 29.318 29.326 29.335 29.344 29.353 29.362 29.371 29.380 29.389 331 29.397 29.406 29.415 29.424 29.433 29.442 29.451 29.460 29.468 29.477 332 29.486 29.495 29.504 29.513 29.522 29.531 29.540 29.548 29.557 29.566 333 29.575 29.584 29.593 29.602 29.611 29.619 29.628 29.637 29.646 29.655 334 29.664 29.673 29.682 29.691 29.699 29.708 29.717 29.726 29.735 29.744 335 29.753 29.762 29.770 29.779 29.788 29.797 29.806 29.815 29.824 29.833 28 In. =» 336 29.842 29.850 29.859 29.868 29.877 29.886 29.895 29.904 29.913 29.921 337 29.930 29.939 29.948 29.957 29.966 29.975 29.984 29.992 30.001 30.010 338 30.019 30.028 30.037 30.046 30.055 30.064 30.072 30.081 30.090 30.099 339 30.108 30.117 30.126 30.135 30.143 30.152 30.161 30.170 30.179 30.188 340 30.197 30.206 30.215 30.223 30.232 30.241 30.250 30.259 30.268 30.277 341 30.286 30.294 30.303 30.312 30.321 30.330 30.339 30.348 30.357 30.366 342 30.374 30.383 30.392 30.401 30.410 30.419 30.428 30.437 30.445 30.454 343 30.463 30.472 30.481 30.490 30.499 30.508 30.516 30.525 30.534 30.543 344 30.552 30.561 30.570 30.579 30.588 30.596 30.605 30.614 30.623 30.632 345 30.641 30.650 30.659 30.667 30.676 30.685 30.694 30.703 30.712 30.721 346 30.730 30.739 30.747 30.756 30.765 30.774 30.783 30.792 30.801 39.810 347 30.818 30.827 30.836 30.845 30.854 30.863 30.872 30.881 30.890 30.898 39 In. = 348 30.907 30.916 30.925 30.934 30.943 30.952 30.961 30.969 30.978 30.987 Hundredths of a Line. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. .0000 .0009 .0018 .0027 .0036 .0044 .0053 .0062 .0071 .0080 38 VI. COMPARISON OF THE OLD FRENCH AND METRICAL BAROMETERS. 1 Paris Line = 2.255829 Millimetres. French or ParisLines. Tens. Units. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10 Inch. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 120 270.70 272.96 275.21 277.47 279.72 281.98 284.23 286.49 288.75 291.00 130 293.26 295.51 297.77 300.03 302-28 304.54 306.79 309.05 311.30 313.56 140 315.82 318.07 320.33 322.58 324.84 327.10 329.35 331.61 333.86 336.12 150 338.37 340.63 342.89 345.14 347.40 349.65 351.91 354.17 356.42 358.68 160 360.93 363.19 365.44 367.70 369.96 372.21 374.47 376.72 378.98 381.24 170 383.49 385.75 388.00 390.26 392.51 394.77 397.03 399.28 401.54 403.79 180 406.05 408.30 410.56 412.82 415.07 417.33 419.58 421.84 424.10 426.35 190 428.61 430.86 433.12 435.37 437.63 439.89 442.14 444.40 446.65 448.91 200 451.17 453.42 455.68 457.93 460.19 462.44 464.70 466.96 469.21 471.47 210 473.72 475.98 478.24 480.49 482.75 485.00 487.26 489.51 491.77 494.03 Paris Lines. Tenths of a Line. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 18 Inch. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 216 487.26 487.48 487.71 487.94 488.16 488.39 488.61 488.84 489.06 489.29 217 489.51 489.74 489.97 490.19 490.42 490.64 490.87 491.09 491.32 491.55 218 491.77 492.00 492.22 492.45 492.67 492.90 493.12 493.35 493.58 493.80 219 494.03 494.25 494.48 494.70 494.93 495.15 495.38 495.61 495.83 496.06 220 496.28 496.51 496.73 496.96 497.18 497.41 497.64 497.86 498.09 498.31 221 498.54 498.76 498.99 499.21 499.44 499.67 499.89 500.12 500.34 500.57 222 500.79 501.02 501.25 501.47 501.70 501.92 502.15 502.37 502.60 502.82 223 503.05 503.28 503.50 503.73 503.95 504.18 504.40 504.63 504.85 505.08 224 505.31 505.53 505.76 505.98 506.21 506.43 506.66 506.88 507.11 507.34 225 507.56 507.79 508.01 508.24 508.46 508.69 508.91 509.14 509.37 509.59 226 509.82 510.04 510.27 510.49 510.72 510.95 511.17 511.40 511.62 511.85 227 512.07 512.30 512.52 512.75 512.98 513.20 513.43 513.65 513.88 514.10 19 Inch. 228 514.33 514.55 514.78 515.01 515.23 515.46 515.68 515.91 516.13 516.36 229 516.58 516.81 517.04 517.26 517.49 517.71 517.94 518.16 518.39 518.61 230 518.84 519.07 519.29 519.52 519.74 519.97 520.19 520.42 520.65 520.87 231 521.10 521.32 521.55 521.77 522.00 522.22 522.45 522.68 522.90 523.13 232 523.35 523.58 523.80 524.03 524.25 524.48 524.71 524.93 525.16 525.38 233 525.61 525.83 526.06 526.28 526.51 526.74 526.96 527.19 527.41 527.64 234 527.86 528.09 528.32 528.54 528.77 528.99 529.22 529.44 529.67 529.89 235 530.12 530.35 530.57 530.80 531.02 531.25 531.47 531.70 531.92 532.15 236 532.38 532.60 532.83 533.05 533.28 533.50 533.73 533.95 534.18 534.41 237 534.63 534.86 535.08 535.31 535.53 535.76 535.98 536.21 536.44 536.66 238 536.89 537.11 537.34 537.56 537.79 538.02 538.24 538.47 538.69 538.92 239 539.14 539.37 539.59 539.82 540.05 540.27 540.50 540.72 540.95 541.17 Tenths of a Line. 0. 0.00 1. 2. 3. 4. 5. 6. 7. 8. 9. 0.23 0.45 0.68 0.90 1.13 1.35 1.58 1.80 2.03 39 COMPARISON OF THE OLD FRENCH AND METRICAL BAROMETERS. 1 Paris Line = 2.255829 Millimetres. Tenths of a Line. Paris or French Lines. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 20 Inches. Milliin. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 240 541.40 541.62 541.85 542.08 542.30 542.53 542.75 542.98 543.20 543.43 241 543.65 543.88 544.11 544.33 544.56 544.78 545.01 545.23 545.46 545.69 242 545.91 546.14 546.36 546.59 • 546.81 547.04 547-26 547.49 547.72 547.94 243 548.17 548.39 548.62 543 .54 549.C7 549.29 549.52 549.75 549.97 550.20 244 550.42 550.65 550.87 551.10 551.32 551.55 551.78 552.00 552.23 552.45 245 552.68 552.90 553.13 553.35 553.58 553.81 554.03 554.26 554.48 554.71 246 554.93 555.16 555.39 555.61 555.84 556.06 556.29 556.51 556.74 556.96 247 557.19 557.42 557.64 557.87 558.09 558.32 558.54 558.77 558.99 559.22 248 559.45 559.67 559.90 560.12 560.35 560.57 560.80 561.02 561.25 561.48 249 561.70 561.93 562.15 562.38 562.60 562.83 563.05 563.28 563.51 563.73 250 563.96 564.18 564.41 564.63 564.86 565.09 565.31 565.54 565.76 565.99 251 566.21 566.44 566.66 566.89 567.12 567.34 567.57 567.79 568.02 568.24 « 1 Inches. 252 568.47 568.69 568.92 569.15 569.37 569.60 569.82 570.05 570.27 570.50 253 570.72 570.95 571.18 571.40 571.63 571.85 572.08 572.30 572.53 572.75 254 572.98 573.21 573.43 573.66 573.88 574.11 574.33 574.56 574.79 575.01 255 575.24 575.46 575.69 575.91 576.14 576.36 576.59 576.82 577.04 577.27 256 577.49 577.72 577.94 578.17 578.39 578.62 578.85 579.07 579.30 579.52 257 579.75 579.97 580.20 580.42 580.65 580.88 581.10 581.33 581.55 581.78 258 582.00 582.23 582.46 582.68 582.91 583.13 583.36 583.58 533.81 584.03 259 584.26 584.49 584.71 584.94 585.16 585.39 585.61 585.84 586.06 586.29 260 586.52 586.74 586.97 587.19 587.42 587.64 587.87 588.09 588.32 588.55 261 588.77 589.00 589.22 589.45 589.67 589.90 590.12 590.35 590.58 590.80 262 591.03 591.25 591.48 591.70 591.93 592.16 592.38 592.61 592.83 593.06 263 593.28 593.51 593.73 593.96 594.19 594.41 594.64 594.86 595.09 595.31 33 Inches. 264 595.54 595.76 595.99 596.22 596.44 596.67 596.89 597.12 597.34 597.57 265 597.79 598.02 598.25 598.47 598.70 598.92 599.15 599.37 599.60 599.82 266 600.05 600.28 600.50 600.73 600.95 601.18 601.40 601.63 601.86 602.08 267 602.31 602.53 602.76 602.98 603.21 603.43 603.66 603.89 604.11 604.34 268 604.56 604.79 605.01 605.24 605.46 605.69 605.92 606.14 606.37 606.59 269 606.82 607.04 607.27 607.49 607.72 607.95 608.17 608.40 608.62 608.85 270 609.07 609.30 609.52 609.75 609.98 610.20 610.43 610.65 610.88 611.10 271 611.33 611.56 611.78 612.01 612.23 612.46 612.68 612.91 613.13 613.36 272 613.59 613.81 614.04 614.26 614.49 614.71 614.94 615.16 615.39 615.62 273 615.84 616.07 616.29 616.52 616.74 616.97 617.19 617.42 617.65 617.87 274 618.10 618.32 618.55 618.77 619.00 619.23 619.45 619.68 619.90 620.13 275 620.33 620.58 620.80 621.03 621.26 621.48 621.71 621.93 622.16 622.38 HundredthsofaLine. 0. 1. 2. 3. 4, 5. 6. 7. §. 9. 0.000 0.023 0.045 0.068 0.090 0.113 0.135 0.158 0.180 0.203 40 COMPARISON OF THE OLD FRENCH AND METRICAL BAROMETERS. 1 Paris Line = 2.255829 Millimetres. Tenths of a Line. Paris or French Lines. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 23 Inches. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 276 622.61 622.83 623.06 623.29 623.51 623.74 623.96 624.19 624.41 624.64 277 624.86 625.09 625.32 625.54 625.77 625.99 626.22 626.44 626.67 626.89 278 627.12 627.35 627.57 627.80 628.02 628.25 628.47 628.70 628.93 629.15 279 629.38 629.60 629.83 630.05 630.28 630.50 630.73 630.96 631.18 631.41 280 631.63 631.86 632.08 632.31 632.53 632.76 632.99 633.21 633.44 633.66 281 633.89 634.11 634.34 634.56 634.79 635.02 635.24 635.47 635.69 635.92 282 636.14 636.37 636.59 636.82 637.05 637.27 637.50 637.72 637.95 638.17 283 638.40 638.63 638.85 639.08 639.30 639.53 639.75 639.98 640.20 640.43 284 640.66 640.88 641.11 641.33 641.56 641.78 642.01 642.23 643.46 642.69 285 642.91 643.14 643.36 643.59 643.81 644.04 644.26 644.49 644.72 644.94 286 645.17 645.39 645.62 645.84 646.07 646.30 646.52 646.75 646.97 647.20 287 617.42 647.65 647.87 648.10 648.33 648.55 648.78 649.00 649.23 649.45 34 Inches. 288 649.68 649.90 650.13 650.36 650.58 650.81 651.03 651.26 651.48 651.71 289 651.93 652.16 652.39 652.61 652.84 653.06 653.29 653.51 653.74 653.96 290 654.19 654.42 654.64 654.87 655.09 655.32 655.54 655.77 656.00 656.22 291 656.45 656.67 656.90 657.12 657.35 657.57 657.80 658.03 658.25 658.48 292 658.70 658.93 659.15 659.38 659.60 659.83 660.06 660.28 660.51 660.73 293 660.96 661.18 661.41 661.63 661.86 662.09 662.31 662.54 662.76 662.99 294, 663.21 663.44 663.66 663.89 664.12 664.34 664.57 664.79 665.02 665.24 295 665.47 665.70 665.92 666.15 666.37 666.60 666.82 667.05 667.27 667.50 296 667.73 667.95 668.18 668.40 668.63 668.85 669.08 669.30 669.53 669.76 297 669.98 670.21 670.43 670.66 670.88 671.11 671.33 671.56 671.79 672.01 298 672.24 672.46 672.69 672.91 673.14 673.36 673.59 673.82 674.04 674.27 299 674.49 674.72 674.94 675.17 675.40 675.62 675.85 676.07 676.30 676.52 85 Inches. 300 676.75 676.97 677.20 677.43 677.65 677.88 678.10 678.33 678.55 678.78 301 679.00 679.23 679.46 679.68 679.91 680.13 680.36 680.58 680.81 681.03 302 681.26 681.49 681.71 681.94 682.16 682.39 682.61 682.84 683.07 683.29 303 683.52 683.74 683.97 684.19 684.42 684.64 684.87 685.10 685.32 685.55 304 685.77 686.00 686.22 686.45 686.67 686.90 687.13 687.35 687.58 687.80 305 688.03 688.25 688.48 688.70 688.93 689.16 689.38 689.61 689.83 690.06 306 690.28 690.51 690.73 690.96 691.19 691.41 691.64 691.86 692.09 692.31 307 692.54 692.77 692.99 693.22 693.44 693.67 693.89 694.12 694.34 694.57 308 694.80 695.02 695.25 695.47 695.70 695.92 696.15 696.37 696.60 696.83 309 697.05 697.28 697.50 697.73 697.95 698.18 698.40 698.63 698.86 699.08 310 699.31 699.53 699.76 699.98 700.21 700.43 700.66 700.89 701.11 701.34 311 701.56 701.79 702.01 702.24 702.47 702.69 702.92 703.14 703.37 703.59 Hundredths of a Line. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0.000 0.023 0.045 0.068 0.090 0.113 0.135 0.158 0.180 0.203 C 41 COMPARISON OF THE OLD FRENCH AND METRICAL BAROMETERS. 1 Paris Line = 2.255829 Millimetres. » Tenths of a Line. Paris or French Lines. 0. 1. 2. 3. 4. 5. 6. jr. 8. 9. ; 36 Inches. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 312 703.82 704.04 704.27 704.50 704.72 704.95 705.17 705.40 705.62 705.85 313 706.07 706.30 706.53 706.75 706.98 707.20 707.43 707.65 707.88 708.10 314 708.33 708.56 708.78 709.01 709.23 709.46 709.68 709.91 710.13 710.36 315 710.59 710.81 711.04 711.26 711.49 711.71 711.94 712.17 712.39 712.62 316 712.84 713.07 713.29 713.52 713.74 713.97 714.20 714.42 714.65 714.87 317 715.10 715.32 715.55 715.77 716.00 716.23 716.45 716.68 716.90 717.13 318 717.35 717.58 717.80 718.03 718.26 718.48 718.71 718.93 719.16 719.38 319 719.61 719.84 720.06 720.29 720.51 720.74 720.96 721.19 721.41 721.64 320 721.87 722.09 722.32 722.54 722.77 722.99 723.22 723.44 723.67 723.90 321 724.12 724.35 724.57 724.80 725.02 725.25 725.47 725.70 725.93 7-26.15 322 726.38 726.60 726.83 727.05 727.28 727.50 727.73 727.96 728.18 728.41 323 728.63 728.86 729.08 729.31 729.54 729.76 729.99 730.21 730.44 730.66 37 Inches. 324 730.89 731.11 731.34 731.57 731.79 732.02 732.24 732.47 732.69 732.92 325 733.14 733.37 733.60 733.82 734.05 734.27 734.50 734.72 734.95 735.17 326 735.40 735.63 735.85 736.08 736.30 736.53 736.75 736.98 737.20 737.43 327 737.66 737.88 738.11 738.33 738.56 738.78 739.01 739.24 739.46 739.69 328 739.91 740.14 740.36 740.59 740.81 741.04 741.27 741.49 741.72 741.94 329 742.17 742.39 742.62 742.84 743.07 743.30 743.52 743.75 743.97 744.20 330 744.42 744.65 744.87 745.10 745.33 745.55 745.78 746.00 746.23 746.45 331 746.68 746.90 747.13 747.36 747.58 747.81 748.03 748.26 748.48 748.71 332 748.94 749.16 749.39 749.61 749.84 750.06 750.29 750.51 750.74 750.97 333 751.19 751.42 751.64 751.87 752.09 752.32 752.54 752.77 753.00 753.22 334 753.45 753.67 753.90 754.12 754.35 754.57 754.80 755.03 755.25 755.48 335 755.70 755.93 756.15 756.38 756.61 756.83 757.06 757.28 757.51 757.73 JW Inches. 336 757.96 758.18 758.41 758.64 758.86 759.09 759.31 759.54 759.76 759.99 337 760.21 760.44 760.67 760.89 761.12 761.34 761.57 761.79 762.02 762.24 , 838 762.47 762.70 762.92 763.15 763.37 763.60 763.82 764.05 764.27 764.50 339 764.73 764.95 765.18 765.40 765.63 765.85 766.08 766.31 766.53 766.76 340 766.98 767.21 767.43 767.66 767.88 768.11 768.34 768.56 768.79 769.01 341 769.24 769.46 769.69 769.91 770.14 770.37 770.59 770.82 771.04 771.27 342 771.49 771.72 771.94 772.17 772.40 772.62 772.85 773.07 773.30 773.52 343 773.75 773.97 774.20 774.43 774.65 774.88 775.10 775.33 775.55 775.78 344 776.01 776.23 776.46 776.68 776.91 777.13 777.36 777.58 777.81 778.04 345 778.26 778.49 778.71 778.94 779.16 779.39 779.61 779.84 780.07 780.29 346 780.52 780.74 780.97 781.19 781.42 781.64 781.87 782.10 782.32 782.55 347 782.77 783.00 783.22 783.45 783.67 783.90 784.13 784.35 784.58 784.80 39 Inches. 348 785.03 785.25 785.48 785.71 785.93 786.16 786.38 786.61 786.83 787.06 Hundredths of a Line. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0.000 0.023 0.045 0.068 0.090 0.113 0.135 0.158 0.180 0.203 42 VII. -VIII. COMPARISON OF THE RUSSIAN BAROMETER THE METRICAL AND THE OLD FRENCH BAROMETERS, OR TABLES FOR CONVERTING RUSSIAN HALF-LINES INTO MILLIMETRES, AND INTO FRENCH OR PARIS LINES ; GIVING THE VALUES CORRESPONDING TO EVERY HALF-LINE FROM 440 TO 540, OR FROM 22 TO 27 INCHES ; AND TO EVERY TENTH, FROM 540 TO 610 HALF-LINES, OR FROM 27 TO 30.5 ENGLISH INCHES. C 43 RUSSIAN BAROMETER. A KEGULAR system of Meteorological Observations has been established by order of the Russian government throughout the extensive regions placed umder its sway, and a vast amount of observations made in Europe, in Asia, and in North America have already been published. The scale of the barometer employed in this system is divided in units, each of which is equal to one half of a Russian, or English decimal line, that is, 1 == 0.05 of an inch, 600 half-lines of the Russian Barometer being = 30 inches of the English Barometer. The conversion of this scale, which is the English scale, slightly modified in its form, is easy. It suffices to divide the Russian heights by two, and to put back, by one figure, the decimal point, in order to have them converted into English inches and decimals. This transformation is so easy to effect, that a peculiar table for it would seem superfluous. The normal temperature of the standard being the same as that of the English, that is, 13° | Reaumur, or 62° Fahrenheit, the reduction of the Russian Barometer to the freezing point can be made by means of the table for reducing the English Barometers. But the attached thermometer being that of Reaumur, its indications must be first converted into degrees of Fahrenheit. Tables VII. and VIII., which follow, have been computed in order to render more easy the comparison and the use of the Barometrical Observations recorded in the large collection, published annually by order of the Emperor of Russia, under the name of Annuaire Meteorologique et Magnetique du Corps des Ingenieurs des Mines. 45 VII. COMPARISON OF THE RUSSIAN AND METRICAL BAROMETERS. 1 Russian Half-Line = 1.289977 Millimetres. Russian Half-Lines. Units or Russian Half-Lines. 0. 1. 2. 3. 4. 5. 6. ?. 8. 9. 23 Inch. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 440 558.79 560.06 561.33 562.60 563.87 565.14 566.41 567.68 568.95 570.22 450 571.49 572.76 574.03 575.30 576.57 577.84 579.11 5S0.38 581.65 582.92 460 584.19 585.46 586.73 588.00 589.27 590.54 591.81 593.08 594.35 595.62 470 596.89 598.16 599.43 600.70 601.97 603.24 604.51 605.78 607.05 608.32 480 609.59 610.86 612.13 613.40 614.67 615.94 617.21 618.48 619.75 621.02 34.5 In. 490 622.29 623.56 624.83 626.10 627.37 628.64 629.91 631.18 632.45 633.72 500 634.99 636.26 637.53 638.80 640.07 641.34 642.61 643.88 645.15 646.42 510 647,69 648.96 650.23 651.50 652.77 654.04 655.31 656.58 657.85 659.12 520 660.39 661.66 662.93 664.20 665.47 666.74 668.01 669.28 670.55 671.82 530 673.09 674.36 675.63 676.90 678.17 679.44 680.71 681.98 683.25 684.52 Russian Half-Lines. Tenths. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 37 Inch. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 540 685.79 685.91 686.04 686.17 686.30 686.42 686.55 686.68 686.80 686.93 541 687.06 687.18 687.31 687.44 687.57 687.69 687.82 687.95 688.07 688.20 542 688.33 688.45 688.58 688.71 688.84 688.96 689.09 689.22 689.34 689.47 543 689.60 689.72 689.85 689.98 690.11 690.23 690.36 690.49 690.61 690.74 544 690.87 690.99 691.12 691.25 691.38 691.50 691.63 691.76 691.88 692.01 545 692.14 692.26 692.39 692.52 692.65 692.77 692.90 693.03 693.15 693.28 546 693.41 693.53 693.66 693.79 693.91 694.04 694.17 694.30 694.42 694.55 547 694.68 694.80 694.93 695.06 695.19 695.31 695.44 695.57 695.69 695.82 548 695.95 696.07 696.20 696.33 696.46 696.58 696.71 696.84 696.96 697.09 549 697.22 697.34 697.47 697.60 697.73 697.85 697.98 698.11 698.23 698.36 37.5 In. 550 698.49 698.61 698.74 698.87 699.00 699.12 699.25 699.38 699.50 699.63 551 699.76 699.88 700.01 700.14 700.27 700.39 700.52 700.65 700.77 700.90 552 701.03 701.15 701.28 701.41 701.54 701.66 701.79 701.92 702.04 702.17 553 702.30 702.42 702.55 702.68 702.81 702.93 703.06 703.19 703.31 703.44 554 703.57 703.69 703.82 703.95 704.08 704.20 704.33 704.46 704.58 704.71 555 704.84 704.96 705.09 705.22 705.35 705.47 705.60 705.73 705.85 705.98 556 706.11 706.23 706.36 706.49 706.62 706.74 706.87 707.00 707.12 707.25 557 707.38 707.50 707.63 707.76 707.89 708.01 708.14 708.27 708.39 708.52 558 708.65 708.77 708.90 709.03 709.16 709.28 709.41 709.54 709.66 709.79 559 709.92 710.14 710.27 710.40 710.53 710.65 710.78 710.81 710.93 711.06 38 Inch. 560 711.19 711.31 711.44 711.57 711.70 711.82 711.95 712.08 712.20 712.33 561 712.46 712.58 712.71 712.84 712.97 713.09 713.22 713.35 713.47 713.60 562 713.73 713.85 713.98 714.11 714.24 714.36 714.49 714.62 714.74 714.87 563 715.00 715.12 715.25 715.38 715.51 715.63 715.76 715.89 716.01 716.14 564 716.27 716.39 716.52 716.65 716.78 716.90 717.03 717.16 717.28 717.41 565 717.54 717.66 717.79 717.92 718.04 718.17 718.30 718.43 718.55 718.68 566 718.81 718.93 719.06 719.19 719.31 719.44 719.57 719.70 719.82 719.95 567 720.08 720.20 720.33 720.46 720.58 720.71 720.84 720.97 721.09 721.22 568 721.35 721.47 721.60 721.73 721.85 721.98 722.11 722.24 722.36 722.49 569 722.62 722.74 722.87 723.00 723.12 723.25 723.38 723.51 723.63 723.76 46 COMPARISON OF THE RUSSIAN AND METRICAL BAROMETERS. 1 Russian Half-Line = 1.269977 Millimetre. Tenths. Russian Half-Lines. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 28.5 Inch. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 570 723.89 724.01 724.14 724.27 724.39 724.52 724.65 724.78 724.90 725.03 571 725.16 725.28 725.41 725.54 725.66 725.79 725.92 726.05 726.17 726.30 572 726.43 726.55 726.68 726.81 726.93 727.06 727.19 727.32 727.44 727.57 573 727.70 727.82 7.27.95 728.08 728.20 728.33 728.46 728.59 728.71 728.84 574 728.97 729.08 729.21 729.34 729.46 729.59 729.73 729.85 729.97 730.11 575 730.24 730.36 730.49 730.62 730.74 730.87 731.00 731.13 731.25 731.38 576 731.51 731.63 731.76 731.89 732.01 732.14 732.27 732.40 732.52 732.65 577 732.78 732.90 733.03 733.16 733.28 733.41 733.54 733.67 733.79 733.92 578 734.05 734.17 734.30 734.43 734.55 734.68 734.81 734.94 735.06 735.19 579 735.32 735.44 735.57 735.70 735.82 735.95 736.08 736.21 736.33 736.46 39 Inch. 580 736.59 736.71 736.84 736.97 737.09 737.22 737.35 737.48 737.60 737.73 581 737.86 737.98 738.11 738.24 738.36 738.49 738.62 738.75 738.87 739.00 582 739.13 739.25 739.38 739.51 739.63 739.76 739.89 740.02 740.14 740.27 583 740.40 740.52 740.65 740.78 740.90 741.03 741.16 741.29 741.41 741.54 584 741.67 741.79 741.92 742.05 742.17 742.30 742.43 742.56 742.68 742.81 585 742.94 743.06 743.19 743.32 743.44 743.57 743.70 743.83 743.95 744.08 586 744.21 744.33 744.46 744.59 744.71 744.84 744.97 745.10 745.22 745.35 587 745.48 745.60 745.73 745.86 745.98 746.11 746.24 746.37 746.49 746.62 588 746.75 746.87 747.00 747.13 747.25 747.38 747.51 747.64 747.76 747.89 589 748.02 748.14 748.27 748.40 748.52 748.65 748.78 748.91 749.03 749.16 39.5 In. 590 749.29 749.41 749.54 749.67 749.79 749.92 750.05 750.18 750.30 750.43 591 750.56 750.68 750.81 750.94 751.06 751.19 751.32 751.45 751.57 751.70 592 751.83 751.95 752.08 752.21 752.33 752.46 752.59 752.72 752.84 752.97 593 753.10 758.22 753.35 753.48 753.60 753.73 753.86 753.99 754.11 754.24 594 754.37 754.49 754.62 754.75 754.87 755.00 755.13 755.26 755.38 755.51 595 755.64 755.76 755.89 756.02 756.14 756.27 756.40 756.53 756.65 756.78 596 756.91 757.03 757.16 757.29 757.41 757.54 757.67 757.80 757.92 758.05 597 758.18 758.30 758.43 758.56 758.68 758.81 758.94 759.07 759.19 759.32 598 759.45 759.57 759.70 759.84 759.96 760.09 760.21 760.34 760.46 760.59 599 760.72 760.84 760.97 761.10 761.22 761.35 761.48 761.61 761.73 761.86 30 Inch. 600 761.99 762.11 762.24 762.37 762.49 762.62 762.75 762.88 763.00 763.13 601 763.26 763.38 763.51 763.64 763.76 763.89 764.02 764.15 764.27 764.40 602 764.53 764.65 764.78 764.91 765.03 765.16 765.29 765.42 765.54 765.67 603 765.80 765.92 766.05 766.18 766.30 766.43 766.56 766.69 766.81 766.95 604 767.07 767.19 767.32 767.45 767.57 767.70 767.83 767.96 768.08 768.21 605 768.34 768.46 768.59 768.72 768.84 768.97 769.10 769.23 769.35 769.48 606 769.61 769.73 769.85 769.99 770.11 770.24 770.37 770.50 770.62 770.75 607 770.88 771.00 771.13 771.26 771.38 771.51 771.64 771.77 771.89 772.02 608 772.15 772.27 772.40 772.53 772.65 772.78 772.91 773.03 773.16 773.29 609 773.42 773.54 773.67 773.80 773.92 774.05 774.18 774.30 774.43 774.56 Hundredths. 0.000 0.013 0.025 0.038 1 0.051 0.063 0.076 0.089 0.102 1 0,114 47 VIII. COMPARISON OF THE RUSSIAN AND OLD FRENCH BAROMETERS. 1 Russian Half-Line = 0.562976 Paris Line. Russian Half-Lines. Units or Russian Half-Lines. 9. 0. 1. 2. 3. 4. 5. 6. 7. 8. 83 Inch. 440 Par. line. 247.71 Par. line. 248.27 Par. line 248.84 Par. line. 249.40 Par line. 249.96 Par line. 250.52 Par. line. 251.09 Par. line 251.65 Par line. 252.21 Par. line. 252.78 450 253.34 253.90 254.47 255.03 255.59 256.15 256.72 257.28 257.84 258.41 460 258.97 259.53 260.09 260.66 261.22 261.78 262.35 262.91 263.47 264.04 470 264.60 265.16 265.72 266.29 266.85 267.41 267.98 268.54 269.10 269.67 480 270.23 270.79 271.35 271.92 272.48 273.04 273.61 274.17 274.73 275.30 34.5 In. 490 275.86 276.42 276.98 277.55 278.11 278.67 279.24 279.80 280.36 280.93 500 281.49 282.05 282.61 283.18 283.74 284.30 284.87 285.43 285.99 286.55 510 287.12 287.68 288.24 288.81 289.37 289.93 290.50 291.06 291.62 292.18 520 292.75 293.31 293.87 294.44 295.00 295.56 296.13 296.69 297.25 297.81 530 298.38 298.94 299.50 300.07 300.63 301.19 301.76 302.32 302.88 303.44 Russian Half-Lines. Tenths. 0. 1. 2. 3. 4. 5. 6. 7. Par. line. 304.40 8. 9. 37 Inch. 540 Par. line. 304.01 Par. line. 304.06 Par. line. 304.12 Par. line. 304.18 Par. line. 304.23 Par. line. 304.29 Par. line. 304.34 Par. line. 304.46 Par. line. 304.51 541 304.57 304.63 304.68 304.74 304.80 304.85 304.91 304.96 305.02 305.08 542 305.13 305.19 305.25 305.30 305.36 305.41 305.47 305.53 305.58 305.64 543 305.70 305.75 305.81 305.86 305.92 305.98 306.03 306.09 306.15 306.20 544 306.26 306.32 306.37 306.43 306.48 306.54 306.60 306.65 306.71 306.77 545 306.82 306.88 306.93 306.99 307.05 307.10 307.16 307.22 307.27 307.33 546 307.38 307.44 307.50 307.55 307.61 307.67 307.72 307.78 307.84 307.89 547 307.95 308.00 308.06 308.12 308.17 308.23 308.29 308.34 308.40 308.45 548 308.51 308.57 308.62 308.68 308.74 308.79 308.85 308.90 308.96 309.02 549 309.07 309.13 309.19 309.24 309.30 309.36 309.41 309.47 309.52 309.58 37.5 In. 550 309.64 309.69 309.75 309.81 309.86 309.92 309.97 310.03 310.09 310.14 551 310.20 310.26 310.31 310.37 310.42 310.48 310.54 310.59 310.65 310.71 552 310.76 310.82 310.88 310.93 310.99 311.04 311.10 311.16 311.21 311.27 553 311.33 311.38 311.44 311.49 311.55 311.61 311.66 311.72 311.78 311.83 554 311.89 311.95 312.00 312.06 312.11 312.17 312.23 312.28 312.34 312.40 555 312.45 312.51 312.56 312.62 312.68 312.73 312.79 312.85 312.90 312.96 556 313.01 313.07 313.13 313.18 313.24 313.30 313.3.5 313.41 313.47 313.52 557 313.56 313.63 313.69 313.75 313.80 313.86 313.92 313.97 314.03 314.08 558 314.14 314.20 314.25 314.31 314.37 314.42 314.48 314.53 314.59 314.65 559 314.70 314.76 314.82 314.87 314.93 314.99 315.04 315.10 315.15 315.21 38 Inch. 560 315.27 315.32 315.38 315.44 315.49 315.55 315.60 315.66 315.72 315.77 561 315.83 315.89 315.94 316.00 316.05 316.11 316.17 316.22 316.28 316.34 562 316.39 316.45 316.51 316.56 316.62 316.67 316.73 316.79 316.84 316.90 563 316.96 317.01 317.07 317.12 317.18 317.24 317.29 317.35 317.41 317.46 564 317.52 317.57 317.63 317.69 317.74 317.80 317.86 317.91 317.97 318.03 565 318.08 318.14 318.19 318.25 318.31 318.36 318.42 318.48 318.53 318.59 566 318.64 318.70 318.76 318.81 318.87 318.93 318.98 319.04 319.09 319.15 567 319.21 319.26 319.32 319.38 319.43 319.49 319.55 319.60 319.66 319.71 568 319.77 319.83 319.88 319.94 320.00 320.05 320.11 320.16 320.22 320.28 569 320.33 320.39 320.45 320.50 320.56 320.61 320.67 320.73 320.78 320.84 48 COMPARISON OF THE RUSSIAN AND OLD FRENCH BAROMETERS. 1 Russian Half-Line = 0.562976 Paris Line. Tenths. Russian Half-Lines. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 38.5 Inch. Par. line. Par. line. Par. line. Par. line. Par. line. Par. line. Par. line Par. line. Par. line. Par. line. 570 320.90 320.95 321.01 321.07 321.12 321.18 321.23 321.29 321.35 321.40 571 321.46 321.52 321.57 321.63 321.68 321.74 321.80 321.85 321.91 321.97 572 322.02 322.08 322.13 322.19 322.25 322.30 322.36 322.42 322.47 322.53 573 322.59 322.64 322.70 322.75 322.81 322.87 322.92 322.98 323.04 323.09 574 323.15 323.20 323.26 323.32 323.37 323.43 323.49 323.54 323.60 323.65 575 323.71 323.77 323.82 323.83 323.94 323.99 324.05 324.11 324.16 324.22 576 324.27 324.33 324.39 324.44 324.50 324.56 324.61 324.67 324.72 324.78 577 324.84 324.89 324.95 325.01 325.06 325.12 325.17 325.23 325.29 325.34 578 325.40 325.46* 325.51 325.57 325.63 325.68 325.74 325.79 325.85 325.91 579 325.96 326.02 326.08 326.13 326.19 326.24 326.30 326.36 326.41 326.47 39 Inch. 5SO 326.53 326.58 326.64 326.69 326.75 326.81 326.86 326.92 326.98 327.03 581 327.09 327.15 327.20 327.26 327.31 327.37 327.43 327.48 327.54 327.60 582 327.65 327.71 327.76 327.82 327.88 327.93 327.99 328.05 328.10 328.16 583 328.22 328.27 328.33 328.38 328.44 328.50 328.55 328.61 328.67 328.72 584 328.78 328.83 328.89 328.95 329.00 329.06 329.12 329.17 329.23 329.28 585 ' 329.34 329.40 329.45 329.51 329.57 329.62 329.68 329.74 329.79 329.85 586 329.90 329.96 330.02 330.07 330.13 330.19 330.24 330.30 330.35 330.41 587 330.47 330.52 330.58 330.64 330.69 330.75 330.80 330.86 330.92 330.97 588 331.03 331.09 331.14 331.20 331.26 331.31 331.37 331.42 331.48 331.54 589 331.59 331.65 331.71 331.76 331.82 331.87 331.93 331.99 332.04 332.10 39.5 In. 590 332.16 332.21 332.27 332.32 332.38 332.44 332.49 332.55 332.61 332.66 591 332.72 332.78 332.83 332.89 332.94 333.00 333.06 333.11 333.17 333.23 592 333.28 333.34 333.39 333.45 333.51 333.56 333.62 333.68 333.73 333.79 593 333.84 333.90 333.96 334.01 334.07 334.13 334.18 334.24 334.30 334.35 594 334.41 334.46 334.52 334.58 334.63 334.69 334.75 334.80 334.86 334.91 595 334.97 335.03 335.08 335.14 335.20 335.25 335.31 335.36 335.42 335.48 596 335.53 335.59 335.65 335.70 335.76 335.82 335.87 335.93 335.98 336.04 597 336.10 336.15 336.21 336.27 336.32 336.38 336.43 336.49 336.55 336.60 598 336.66 336.72 336.77 336.83 336.88 336.94 337.00 337.05 337.11 337.17 1 599 337.22 337.28 337.34 337.39 337.45 337.50 337.56 337.62 337.67 337.73 30 Inch. 600 337.79 337.84 337.90 337.95 338.01 338.07 338.12 338.18 338.24 338.29 601 338.35 338.40 338.46 338.52 338.57 338.63 338.69 338.74 338.80 338.86 602 338.91 338.97 339.02 339.08 339.14 339.19 339.25 339.31 339.36 339.42 603 339.47 339.53 339.59 339.64 339.70 339.76 339.81 339.87 339.92 339.98 60 1 340.04 340.09 340.15 340.21 340.26 340.32 340.38 340.43 340.49 340.54 605 340.60 340.66 340.71 340.77 340.83 340.88 340.94 340.99 341.05 341.11 606 341.16 341.22 341.28 341.33 341.39 341.44 341.50 341.56 341.61 341.67 607 341.73 341.78 341.84 341.90 341.95 342.01 342.06 342.12 342.18 342.23 608 342.29 342.35 342.40 342.46 342.51 342.57 342.63 342.68 342.74 342.80 609 342.85 342.91 342.96 343.02 343.08 343.13 343.19 343.25 343.30 343.36 Hundredths. 0.000 0.006 | 0.011 0.017 0.022 0.028 0.034 0.039 0.045 0.051 49 IX. -XVI. COMPARISON OF BAROMETRICAL DIFFERENCES EXPRESSED IN MEASURES OF DIFFERENT SCALES, TABLES FOR CONVERTING ENGLISF/ INCHES, MILLIMETRES, PARIS LINES, AND RUSSIAN HALF-LINES INTO EACH OTHER. 51 IX. CONVERSION OF ENGLISH INCHES INTO MILLIMETRES. 1 English Inch = 25.39954 Millimetres. Hundredths of an Inch. English Inches and Tenths. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0.0 0.000 0.254 0.508 0.762 1.016 1.270 1.524 1.778 2.032 2.286 0.1 2.540 2.794 3.048 3.302 3.556 3.810 4.064 4.318 4.572 4.826 0.2 5.080 5.334 5.588 5.842 6.096 6.350 6.604 6.858 7.112 7.366 0.3 7.620 7.874 8.128 8.382 8.636 8.890 9.144 9.398 9.652 9.906 0.4 10.160 10.414 10.668 10.922 11.176 11.430 11.684 11.938 12.192 12.446 0.5 12.700 12.954 13.208 13.462 13.716 13.970 14.224 14.478 14.732 14.986 0.6 15.240 15.494 15.748 16.002 16.256 16.510 16.764 17.018 17.272 17.526 0.7 17.780 18.034 18.288 18.542 18.796 19.050 19.304 19.558 19.812 20.066 0.8 20.320 20.574 20.828 21.082 21.336 21.590 21.844 22.098 22.352 22.606 0.9 22.860 23.114 23.368 23.622 23.876 24.130 24.384 24.638 24.892 25.146 1.0 25.400 25.654 25.908 26.162 26.416 26.670 26.924 27.178 27.432 27.685 1.1 27.939 28.193 28.447 28.701 28.955 29.209 29.463 29.717 29.971 30.225 1.2 30.479 30.733 30.987 31.241 31.495 31.749 32.003 32.257 32.511 32.765 1.3 33.019 33.273 33.527 33.781 34.035 34.289 34.543 34.797 35.051 35.305 1.4 35.559 35.813 36.067 36.321 36.575 36.829 37.083 37.337 37.591 37.845 1.5 38.099 38.353 38.607 38.861 39.115 39.369 39.623 39.877 40.131 40.385 1.6 40.639 40.893 41.147 41.401 41.655 41.909 42.163 42.417 42.671 42.925 1.7 43.179 43.433 43.687 43.941 44.195 44.449 44.703 44.957 45.211 45.465 1.8 45.719 45.973 46.227 46.481 46.735 46.989 47.243 47.497 47.751 48.005 X. CONVERSION OF ENGLISH INCHES INTO FRENCH OR PARIS LINES. 1 English Inch = 11.259515 Paris Lines. Hundredths of an Inch. English Inches and Tenths. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Par. line. Par. line. Par. line. Par. line. Par. line. Par. line. Par. line. Par. line. Par. line. Par. line. 0.0 0.000 0.113 0.225 0.338 0.450 0.563 0.676 0.788 0.901 1.013 0.1 1.126 1.239 1.351 1.464 1.576 1.689 1.802 1.914 2.027 2.139 0.2 2.252 2.364 2.477 2.590 2.702 2.815 2.927 3.040 3.153 3.265 0.3 3.378 3.490 3.603 3.716 3.828 3.941 4.053 4.166 4.279 4.391 0.4 4.504 4.616 4.729 4.842 4.954 5.067 5.179 5.292 5.405 5.517 0.5 5.630 5.742 5.855 5.968 6.080 6.193 6.305 6.418 6.531 6.643 0.6 6.756 6.868 6.981 7.093 7.206 7.319 7.431 7.544 7.656 7.769 0.7 7.882 7.994 8.107 8.219 8.332 8.445 8.557 8.670 8.782 8.895 0.8 9.008 9.120 9.233 9.345 9.458 9.571 9.683 9.796 9.908 10.021 0.9 10.134 10.246 10.359 10.471 10.584 10.697 10.809 10.922 11.034 11.147 .0 11.260 11.372 11.485 11.597 11.710 11.822 11.935 12.048 12.160 12.273 .1 12.385 12.498 12.611 12.723 12.836 12.948 13.061 13.174 13.286 13.399 .2 13.511 13.624 13.737 13.849 13.962 14.074 14.187 14.300 14.412 14.525 .3 14.637 14.750 14.863 14.975 15.088 15.200 15.313 15.426 15.538 15.651 .4 15.763 15.876 15.988 16.101 16.214 16.326 16.439 16.551 16.664 16.777 .5 16.889 17.002 17.114 17.227 17.340 17.452 17.565 17.677 17.790 17.903 .6 18.015 18.128 18.240 18.353 18.466 18.578 18.691 18.803 18.916 19.029 .7 19.141 19.254 19.366 19.479 19.592 19.704 19.817 19.929 20.042 20.155 .8 20.267 20.380 20.492 20.605 20.717 20.830 20.943 21.055 21.168 21.280 53 XI. CONVERSION OF MILLIMETRES INTO ENGLISH INCHES. 1 Metre = 39.37079 English Inches. Tenths of a Millimetre. Millime- tres. 0. 1. 2. 3. 4. 5. 6. •7. 8. 9. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. 0 0.0000 0.0039 0.0079 0.0118 0.0157 0.0197 0.0236 0.0276 0.0315 0.0354 1 0.0394 0.0433 0.0472 0.0512 0.0551 0.0591 0.0630 0.0669 0.0709 0.0748 2 0.0787 0.0827 0.0866 0.0906 0.0945 0.0984 0.1024 0.1063 0.1102 0.1142 3 0.1181 0.1220 0.1260 0.1299 0.1339 0.1378 0.1417 0.1457 0.1496 0.1535 4 0.1575 0.1614 0.1654 0.1693 0.1732 0.1772 0.1811 0.1850 0.1890 0.1929 5 0.1969 0.2008 0.2047 0.2087 0.2126 0.2165 0.2205 0.2244 0.2283 0.2323 6 0.2362 0.2402 0.2441 0.2480 0.2520 0.2559 0.2598 0.2638 0.2677 0.2717 7 0.2756 0.2795 0.2835 0.2874 0.2913 0.2953 0.2992 0.3032 0.3071 0.3110 8 0.3150 0.3189 0.3228 0.3268 0.3307 0.3347 0.3386 0.3425 0.3465 0.3504 9 0.3543 0.3583 0.3622 0.3661 0.3701 0.3740 0.3780 0.3819 0.3858 0.3898 10 0.3937 0.3976 0.4016 0.4055 0.4095 0.4134 0.4173 0.4213 0.4252 0.4291 11 0.4331 0.4370 0.4410 0.4449 0.4488 0.4528 0.4567 0.4606 0.4646 0.4685 12 0.4724 0.4764 0.4803 0.4843 0.4882 0.4921 0.4961 0.5000 0.5039 0.5079 13 0.5118 0.5158 0.5197 0.5236 0.5276 0.5315 0.5354 0.5394 0.5433 0.5473 14 0.5512 0.5551 0.5591 0.5630 0.5669 0.5709 0.5748 0.5788 0.5827 0.5866 15 0.5906 0.5945 0.5984 0.6024 0.6063 0.6102 0.6142 0.6181 0.6221 0.6260 16 0.6299 0.6339 0.6378 0.6417 0.6457 0.6496 0.6536 0.6575 0.6614 0.6654 17 0.6693 0.6732 0.6772 0.6811 0.6851 0.6890 0.6929 0.6969 0.7008 0.7047 18 0.7087 0.7126 0.7165 0.7205 0.7244 0.7284 0.7323 0.7362 0.7402 0.7441 19 0.7480 0.7520 0.7559 0.7599 0.7638 0.7677 0.7717 0.7756 0.7795 0.7835 20 0.7874 0.7914 0.7953 0.7992 0.8032 0.8071 0.8110 0.8150 0.8189 0.8228 21 0.8268 0.8307 0.8347 0.8386 0.8425 0.8465 0.8504 0.8543 0.8583 0.8622 22 0.8662 0.8701 0.8740 0.8780 0.8819 0.8858 0.8898 0.8937 0.8977 0.9016 23 0.9055 0.9095 0.9134 0.9173 0.9213 0.9252 0.9292 0.9331 0.9370 0.9410 24 0.9449 0.9488 0.9528 0.9567 0.9606 0.9646 0.9685 0.9725 0.9764 0.9803 25 0.9843 0.9882 0.9921 0.9961 .0000 1.0040 1.0079 .0118 1.0158 1.0197 26 1.0236 1.0276 1.0315 .0355 .0394 1.0433 1.0473 .0512 1.0551 1.0591 27 1.0630 1.0669 1.0709 .0748 .0788 1.0827 1.0866 .0906 1.0945 1.0984 28 1.1024 1.1063 1.1103 .1142 .1181 1.1221 1.1260 .1299 1.1339 1.1378 29 1.1418 1.1457 1.1496 .1536 .1575 1.1614 1.1654 .1693 1.1732 1.1772 30 1.1811 1.1851 1.1890 .1929 .1969 .2008 1.2047 .2087 1.2126 1.2166 31 1.2205 1.2244 1.2284 .2323 .2362 .2402 1.2441 .2481 1.2520 1.2559 32 1.2599 1.2638 1.2677 .2717 .2756 .2796 1.2835 .2874 1.2914 1.2953 33 1.2992 1.3032 1.3071 ' .3110 .3150 .3189 1.3229 .3268 1.3307 1.3347 34 1.3386 1.3425 1.3465 .3504 .3544 .3583 1.3622 .3662 1.3701 1.3740 35 1.3780 1.3819 1.3859 .3898 .3937 .3977 1.4016 .4055 1.4095 1.4134 36 1.4173 1.4213 1.4252 .4292 .4331 .4370 1.4410 .4449 1.4488 1.4528 37 1.4567 1.4607 1.4646 .4685 .4725 .4764 1.4803 .4843 1.4882 1.4922 38 1.4961 1.5000 1.5040 .5079 .5118 .5158 1.5197 .5236 1.5276 1.5315 39 1.5355 1.5394 1.5433 .5473 .5512 .5551 1.5591 .5630 1.5670 1.5709 40 1.5748 1.5788 1.5827 .5866 .5906 .5945 1.5985 .6024 1.6063 1.6103 0. 1. 2. 3. 4. 9. 6. 7. 8. 9. XII. CONVERSION OF MILLIMETRES INTO FRENCH OR PARIS LINES. 1 Millimetre = 0.443296 Paris Line. Millime- Tenths of a Millimetre. tres. 0. 1. 2. 3. 4. 5. 6. ?. 8. 9. Par. line. Par. line. Par. line. Par. line. Par. line. Par. line. Par. line Par. line. Par. line Par. line. 0 0.000 0.044 0.089 0.133 0.177 0.222 0.266 0.310 0.355 0.399 1 0.443 0.488 0.532 0.576 0.621 0.665 0.709 0.754 0.798 0.842 2 0.887 0.931 0.975 1.020 1.064 1.108 1.153 1.197 1.241 1.286 3 1.330 1.374 1.419 1.463 1.507 1.552 1.596 1.640 1.685 1.729 4 1.773 1.818 1.862 1.906 1.950 1.995 2.039 2.083 2.128 2.172 5 2.216 2.261 2.305 2.349 2.394 2,438 2.482 2.527 2.571 2.615 6 2.660 2.704 2.748 2.793 2.837 2.881 2.926 2.970 3.014 3.059 7 3.103 3.147 3.192 3.236 3.280 3.325 3.369 3.413 3.458 3.502 8 3.546 3.591 3.635 3.679 3.724 3.768 3.812 3.857 3.901 3.945 9 3.990 4.034 4.078 4.123 4.167 4.211 4.256 4.300 4.344 4.389 10 4.433 4.477 4.522 4.566 4.610 4.655 4.699 4.743 4.788 4.832 11 4.876 4.921 4.965 5.009 5.054 5.098 5.142 5.187 5.231 5.275 12 5.320 5.364 5.408 5.453 5.497 5.541 5.586 5.630 5.674 5.719 13 5.763 5.807 5.851 5.896 5.940 5.984 6.029 6.073 6.117 6.162 14 6.206 6.250 6.295 6.339 6.383 6.428 6.472 6.516 6.561 6.605 15 6.649 6.694 6.738 6.782 6.827 6.871 6.915 6.960 7.004 7.048 16 7.093 7.137 7.181 7.226 7.270 7.314 7.359 7.403 7.447 7.492 17 7.536 7.580 7.625 7.669 7.713 7.758 7.802 7.846 7.891 7.935 18 7.979 8.024 8.068 8.112 8.157 8.201 8.245 8.290 8.334 8.378 19 8.423 8.467 8.511 8.556 8.600 8.644 8.689 8.733 8.777 8.822 20 8.866 8.910 8.955 8.999 9.043 9.088 9.132 9.176 9.221 9.265 21 9.309 9.354 9.398 9.442 9.487 9.531 9.575 9.620 9.664 9.708 22 9.753 9.797 9.841 9.886 9.930 9.974 10.018 10.063 10.107 10.151 23 10.196 10.240 10.284 10.329 10.373 10.417 10.462 10.506 10.550 10.595 24 10.639 10.683 10.728 10.772 10.816 10.861 10.905 10.949 10.994 11.038 25 11.082 11.127 11.171 11.215 11.260 11.304 11.348 11.393 11.437 11.481 26 11.526 11.570 11.614 11.659 11.703 11.747 11.792 11.836 11.880 11.925 27 11.969 12.013 12.058 12.102 12.146 12.191 12.235 12.279 12.324 12.368 28 12.412 12.457 12.501 12.545 12.590 12.634 12.678 12.723 12.767 12.811 29 12.856 12.900 12.944 12.989 13.033 13.077 13.122 13.166 13.210 13.255 30 13.299 13.343 13.388 13.432 13.476 13.521 13.565 13.609 13.654 13.698 31 13.742 13.786 13.831 13.875 13.919 13.964 14.008 14.052 14.097 14.141 32 14.185 14.230 14.274 14.318 14.363 14.407 14.451 14.496 14.540 14.584 33 14.629 14.673 14.717 14.762 14.806 14.850 14.895 14.939 14.983 15.028 34 15.072 15.116 15.161 15.205 15.249 15.294 15.338 15.382 15.427 15.471 35 15.515 15.560 15.604 15.648 15.693 15.737 15.781 15.826 15.870 15.914 36 15.959 16.003 16.047 16.092 16.136 16.180 16.225 16.269 16.313 16.358 37 16.402 16.446 16.491 16.535 16.579 16.624 16.668 16.712 16.757 16.801 38 16.845 16.890 16.934 16.978 17.023 17.067 17.111 17.156 17.200 17.244 39 17.289 17.333 17.377 17.422 17.466 17.510 17.555 17.599 17.643 17.688 40 17.732 17.776 17.820 17.865 17.909 17.953 17.998 18.042 18.086 18.131 O. 1. 2. 3. 4. 5. 6. 7. §. 9. 55 XIII. CONVERSION OF THE FRENCH OR PARIS LINES INTO MILLIMETRES. 1 Paris Line = 2.255829 Millimetres. Tenths of a Line. Paris Lines. o. 1. 2. 3. 4. 5. 6. 7. 8. 9. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.000 0.226 0.451 0.677 0.902 1.128 1.353 1.579 1.805 2.030 1 2.256 2.481 2.707 2.933 3.158 3.384 3.609 3.835 4.060 4.286 2 4.512 4.737 4.963 5.188 5.414 5.640 5.865 6.091 6.316 6.542 3 6.767 6.993 7.219 7.444 7.670 7.895 8.121 8.347 8.572 8.798 4 9.023 9.249 9.474 9.700 9.926 10.151 10.377 10.602 10.828 11.054 5 11.279 11.505 11.730 11.956 12.181 12.407 12.633 12.858 13.084 13.309 6 13.535 13.761 13.986 14.212 14.437 14.663 14.888 15.114 15.340 15.565 7 15.791 16.016 16.242 16.468 16.693 16.919 17.144 17.370 17.595 17.821 8 18.047 18.272 18.498 18.723 18.949 19.175 19.400 19.626 19.851 20.077 9 20.302 20.528 20.754 20.979 21.205 21.430 21.656 21.882 22.107 22.333 10 22.558 22.784 23.009 23.235 23.461 23.686 23.912 24.137 24.363 24.589 11 24.814 25.040 25.265 25.491 25.716 25.942 26.168 26.393 26.619 26.844 12 27.070 27.296 27.521 27.747 27.972 28.198 28.423 28.649 28.875 29.100 13 29.326 29.551 29.777 30.003 30.228 30.454 30.679 30.905 31.130 31.356 14 31.582 31.807 32.033 32.258 32.485 32.711 32.936 33.162 33.387 33.613 15 33.837 34.063 34.289 34.514 34.740 34.965 35.191 35.417 35.642 35.868 16 36.093 36.319 36.544 36.770 36.996 37.221 37.447 37.672 37.898 38.124 17 38.349 38.575 38.800 39.026 39.251 39.477 39.703 39.928 40.154 40.379 18 40.605 40.831 41.056 41 282 41.507 41.733 41.958 42.184 42.410 42.635 XIV. CONVERSION OF FRENCH OR PARIS LINES INTO ENGLISH INCHES. 1 Paris Line = 0.088814 English Inch. Tenths of a Line. Paris Lines. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Eng. In. Eng In. Eng. In. Eng. In. Eng. In Eng. In. Eng. In. Eng. In. Eng. In. Eng. In. 0 0.0000 0.0089 0.0178 0.0266 0.0355 0.0444 0.0533 0.0622 0.0711 0.0799 1 0.0888 0.0977 0.1066 0.1155 0.1243 0.1332 0.1421 0.1510 0.1599 0.1687 2 0.1776 0.1865 0.1954 0.2043 0.2132 0.2220 0.2309 0.2398 0.2487 0.2576 3 0.2664 0.2753 0.2842 0.2931 0.3020 0.3108 0.3197 0.3286 0.3375 0.3464 4 0.3553 0.3641 0.3730 0.3819 0.3908 0.3997 0.4085 0.4174 0.4263 0.4352 5 0.4441 0.4530 0.4618 0.4707 0.4796 0.4885 0.4974 0.5062 0.5151 0.5240 6 0.5329 0.5418 0.5506 0.5595 0.5684 0.5773 0.5862 0.5951 0.6039 0.6128 7 0.6217 0.6306 0.6395 0.6483 0.6572 0.6661 0.6750 0.6839 0.6927 0.7016 8 0.7105 0.7194 0.7283 0.7372 0.7460 0.7549 0.7638 0.7727 0.7816 0.7904 9 0.7993 0.8082 0.8171 0.8260 0.8349 0.8437 0.8526 0.8615 0.8704 0.8793 90 0.8881 0.8970 0.9059 0.9148 0.9237 0.9325 0.9414 0.9503 0.9592 0.9681 0.1 0.9770 0.9858 0.9947 1.0036 1.0125 1.0214 1.0302 1.0391 1.0480 1.0569 12 1.0658 1.0746 .0835 .0924 .1013 .1102 .1191 1.1279 1.1368 1.1457 13 .1546 .1635 .1723 .1812 .1901 .1990 .2079 1.2168 1.2256 1.2345 14 .2434 .2523 .2612 .2700 .2789 .2878 .2967 1.3056 1.3144 1.3233 15 .3322 .3411 .3500 .3589 .3677 .3766 .3855 1.3944 1.4033 1.4121 16 .4210 .4299 .4388 .4477 .4565 .4654 .4743 1.4832 1.4921 1.5010 17 .5098 .5187 .5276 .5365 .5454 .5542 .5631 1.5720 1.5809 1.5898 18 .5987 .6075 1.6164 .6253 .6342 .6431 .6519 1.6608 1.6697 1.6786 56 XV. CONVERSION OF RUSSIAN HALF-LINES INTO MILLIMETRES. 1 Russian Half-Line = 1.269977 Millimetres. Russian Half-Lines. Tenths. 0. Millim. 1. 2. 3. 4. 5. 6. 7. 8. 9. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.000 0.127 0.254 0.381 0.508 0.635 0.762 0.889 1.016 1.143 1 1.270 1.397 1.524 1.651 1.778 1.905 2.032 2.159 2.286 2.413 2 2.540 2.667 2.794 2.921 3.048 3.175 3.302 3.429 3.556 3.683 8 3.810 3.937 4.064 4.191 4.318 4-445 4.572 4.699 4.826 4.953 4 5.080 5.207 5.334 5.461 5.588 5.715 5.842 5.969 6.096 6.223 5 6.350 6.477 6.604 6.731 6.858 6.985 7.112 7.239 7.366 7.493 6 7.620 7.747 7.874 8.001 8.128 8.255 8.382 8.509 8.636 8.763 7 8.890 9.017 9.144 9.271 9.398 9.525 9.652 9.779 9.906 10.033 8 10.160 10.287 10.414 10.541 10.668 10.795 10.922 11.049 11.176 1 1 .303 9 11.430 11.557 11.684 11.811 11.938 12.065 12.192 12.319 12.446 12.573 10 12.700 12.827 12.954 13.081 13.208 13.335 13.462 13.589 13.716 13.843 11 13.970 14.097 14.224 14.351 14.478 14.605 14.732 14.859 14.986 15.113 12 15.240 15.367 15.494 15.621 15.748 15.875 16.002 16.129 16.256 16.383 13 16.510 16.637 16.764 16.891 17.018 17.145 17.272 17.399 17.526 17.653 14 17.780 17.907 18.034 18.161 18.288 18.415 18.542 18.669 18.796 18.923 15 19.050 19.177 19.304 19.431 19.558 19.685 19.812 19.939 20.066 20.193 16 20.320 20.447 20.574 20.701 20.828 20.955 21.082 21.209 21.336 21.463 17 21.590 21.717 21.844 21.971 22.098 22.225 22.352 22.479 22.606 22.733 18 22.860 22.987 23.114 23.241 23.368 23.495 23.622 23.749 23.876 24.003 XVI. CONVERSION OF RUSSIAN HALF-LINES INTO PARIS LINES. " 1 Russian Half-Line = 0.562976 Paris Line. Russian Half-Lines. Tenths. 0. 1. 2. 3. 4. 5. 6. ?. 8. 9. Par. line Par. line. Par. line. Par. line. Par. line. Par. line. Par. line. Par. line. Par. line. Par. line. 0 0.000 0.056 0.113 0.169 0.225 0.281 0.338 0.394 0.450 0.507 1 0.563 0.619 0.676 0.732 0.788 0.844 0.901 0.957 1.013 1.070 2 1.126 1.182 1.239 1.295 1.351 1.407 1.464 1.520 1.576 1.633 3 1.689 1.745 1.802 1.858 1.914 1.970 2.027 2.083 2.139 2.196 4 2.252 2.308 2.364 2.421 2.477 2.533 2.590 2.646 2.702 2.759 5 2.815 2.871 2.927 2.984 3.040 3.096 3.153 3.209 3.265 3.322 6 3.378 3.434 3.490 3.547 3.603 3.659 3.716 3.772 3.828 3.885 7 3.941 3.997 4.053 4.110 4.166 4.222 4.2-79 4.335 4.391 4.448 8 4.504 4.560 4.616 4.673 4.729 4.785 4.842 4.898 4.954 5.010 9 5.067 5.123 5.179 5.236 5.292 5.34S 5.405 5.461 5.517 5.573 10 5.630 5.686 5.742 5.799 5.855 5.911 5.968 6.024 6.080 6.136 11 6.193 6.249 6.305 6.362 6.418 6.474 6.531 6.587 6.643 6.699 12 6.756 6.812 6.868 6.925 6.981 7.037 7.093 7.150 7.206 7.262 13 7.319 7.375 7.431 7.488 7.544 7.600 7.656 7.713 7.769 7.825 14 7.882 7.938 7.994 8.051 8.107 8.163 8.219 8.276 8.332 8.388 15 8.445 8.501 8.557 8.614 8.670 8.726 8.782 8.839 8.895 8.951 16 9.008 9.064 9.120 9.177 9.233 9.289 9.345 9.402 9.458 9.514 17 9.571 9.627 9.683 9.739 9.796 9.852 9.908 9.965 10.021 10.077 18 10.134 10.190 10.246 10.302 10.359 10.415 10.471 10.528 10.584 10.640 57 TABLES FOR REDUCING BAROMETRICAL OBSERVATIONS, TAKEN AT ANY TEMPERATURE, TO THE TEMPERATURE OF THE FREEZING POINT. 59 TABLES FOB REDUCING THE BAROMETRICAL OBSERVATIONS TAKEN AT ANY TEMPERATURE TO THE TEMPERATURE OF THE FREEZING POINT. THE variations of the mercurial column in a stationary barometer are due to two causes, the changes of atmospheric pressure and the variations of temperature of the mercury, which affect the length of the column by changing its density. The varia- i tions of atmospheric pressure, which alone the barometer is destined to ascertain, are therefore hidden, and their observation falsified by the expansion or contraction of the mercury due to changes of temperature. For, supposing that, while the atmospheric pressure remains the same, the temperature of the instrument becomes lower, the mercurial column will become shorter, and the barometer will appear to fall ; if the pressure becomes less, but the temperature increases, the expansion of the mercury will tend to compensate the diminution of pressure, and the barometer may remain stationary, or even may rise, while it ought to be falling ; in other cases the action of temperature will tend to increase .the amount of the changes of the barometrical height. It is therefore evident that successive observations, with the same barometer, do not give directly the actual changes of atmospheric pressure, unless they hav« been taken exactly at the same temperature, a case which, in practice, seldom occurs. Likewise simultaneous observations, taken with various barometers, do not give directly the actual differences of the absolute pressure of the atmosphere above the instruments. To obtain the true barometrical heights, that is, the action of the at- mospheric pressure alone, the influence of the temperature must first be eliminated from the observed heights. This is done by reducing, by means of the following Tables, the various barometrical columns to the length they would have at a given temperature, which is the same for all. For the sake of convenient comparison, the freezing point has been almost universally adopted as the standard temperature to which all observations are to be reduced. CONSTRUCTION OF THE TABLES. In all the following Tables the barometers are supposed to be furnished with brass scales, extending from the surface of the mercury in the cistern to the top of the mercurial column. The correction to be applied is therefore composed of two ele- ments : the correction for the expansion of the mercury, and that for the expansion of the scale ; both of which ought to be, and have been, taken into account. Indeed, the correction for the expansion of mercury is not sufficient to reduce the readings to the height which the barometer would indicate, under the same pressure, at the temperature of the freezing point. For when the temperature rises the mer- curial column expands ; but then the scale also grows longer, and this will tend to lower the reading of the height. The correction for the expansion of the mercury 0 61 TABLES FOR REDUCING BAROMETRICAL OBSERVATIONS. must thus be diminished by the amount of that of the scale, that is, by nearly ^, this being the proportion between the expansion of brass and that of mercury. It is also the expansion of the scale which causes an apparent anomaly in the Tables for the Reduction of the English and Old French Barometers. It can be seen, that, though the observations are to be reduced to the freezing point, or to 32° Fahrenheit and zero Reaumur, the Tables give still a correction for observa- tions taken at that temperature. The reason of it is, that the normal length of the English and Old French standards has not been determined at the temperature of the freezing point, as is the case with the metre, but respectively at the temperatures of 62° Fahrenheit and 13° Reaumur. It is thus only at these temperatures that the scales graduated with these standards have their true length. Above and below, the inches of the scales are longer or shorter than the inches of the standards. At the freezing point, therefore, the correction for the expansion of the mercury is null, but that for the expansion of the scale is not. The scale being too short, the reading will be too high, and a subtractive correction must still be applied, which will be gradually compensated at lower temperatures by the now additive correction of the mercurial column. Thus the point of no correction will occur at 28°. 5 Fahrenheit, instead of 32°, in the English Barometer, and at — 1°.5 Reaumur, instead of zero, in the Old French. Schumacher has calculated and published in his Collection of Tables, &c., and in his Jahrbuch for 1836, 1837, and 1838, extensive tables for the reduction of the Eng- lish, Old French, and Metrical Barometers, using the following general formula : — Let h = observed height. " t = temperature of the attached thermometer. " T = temperature to which the observed height is to be reduced. " m = expansion, in volume, of mercury. 44 I = linear expansion of brass. " & = normal temperature of the standard scale. The reduction to the freezing point will be given by the formula, — 7 m(t— T) — l(t — 3-) i+i»v-T) The following tables, which may be found more convenient for ordinary use, have been calculated from the same formula. Table XVIL, published in the Instructions of the Royal Society of London, is mostly abstracted from the table of Schumacher. It gives the reduction of the English Barometer, adopting the following values : — Let h = observed height in English inches. " t = temperature of attached thermometer in degrees of Fahrenheit. " m — expansion, in volume, of mercury for one degree Fahrenheit — 0.0001001. " I — linear expansion of brass for one degree Fahrenheit = 0.0000104344. The normal temperature of standard being — 62°. The reduction to 32° Fahrenheit will be given then by the formula, The elements for the other tables are found at the head of each. C 62 XVII. ENGLISH BAROMETER TABLE GIVING THE CORRECTION TO BE APPLIED TO ENGLISH BAROMETERS, WITH BRASS SCALES EXTENDING FROM THE CISTERN TO THE TOP OP THE MERCURIAL COLUMN, FOR REDUCING THE OBSERVATIONS , TO THIRTY-TWO DEGREES FAHRENHEIT. TABLE XVII. THE following Table, calculated after that of Schumacher, has been adopted by the Committee of Physics and Meteorology of the Royal Society of London. It gives immediately the correction for every degree of Fahrenheit, and for every half-inch from 20 up to 31 inches. The scale of the barometer is supposed to be of brass, extending from the cistern to the top of the mercurial column. The difference of ex- pansion of brass and mercury is taken into account. The standard temperature of the yard being 62° Fahr., and not 32° Fahr., the difference of expansion of the scale and of the mercurial column carries the point of no correction down to 29° Fahr. Therefore, from 29° up the correction must be subtracted from, from 29° down it must be added to, the observed height. Examples of Calculation. Barometer, observed height, 30.231 Attached thermometer 82° Fahr. See in the last page the column of 30 inches ; go down as far as the horizontal line corresponding with 82° in the first vertical column, which contains the tempera- tures ; you will find there the correction — .143. We have thus : •. — Barometer, observed height, ..... 30.231 Subtractive correction for 82° Fahr., . . . —0.143 Barometer at 32° Fahr., . . . 30.088 Barometer, observed height, . . . . . 29.743 Attached thermometer 25° Fahr. The column of 29.5 inches opposite to 25° Fahr. gives an additive correction of, * . +0.009 Barometer at 32° Fahr., . . . 29.752 It will be easy to apply also the correction for fractions of a degree Fahrenheit ;. for example : — Barometer, observed height, 28.358 Attached' thermometer 71.3 In the column of 28.5 inches, we find that the difference between the correction for 71° and that for 72° is .003; dividing this differ- ence proportionally to the fraction, we have for three tenths of a de- gree a correction of — .001, which added to — .108, the correction for 71°, makes a total correction of, .... — .109 And barometer at 32° Fahr., . . . 28.249 C 65 XVII. REDUCTION OF THE ENGLISH BAROMETER TO THE FREEZING POINT. Degrees of Fah- renheit. English Inches. Degrees of Fah- renheit. 2O 20.5 21 21.5 22 22.5 23 23.5 o 0 +.051 +.053 +.054 +.055 +.056 +.058 +.059 +.060 °0 1 .049 .051 .052 .053 .054 .056 .057 .058 1 2 .048 .049 .050 .051 .052 .054 .055 .056 2 3 .046 .047 .048 .049 .050 .052 .053 .054 3 4 .044 .045 .046 .047 .048 .050 .051 .052 4 5 .042 .043 .044 .045 .046 .048 .049 .050 5 6 + 040 +.042 +.042 +.044 +.044 +.046 +.047 +.048 6 7 .039 .040 .041 .042 .042 .044 .044 .046 7 8 .037 .038 .039 .040 .041 .041 .042 .043 8 9 .035 .036 .037 .038 .039 .039 .040 .041 9 10 .033 .034 .035 .036 .037 .037 .038 .039 10 11 +.031 +.032 +.033 +.034 +.035 +.035 +.036 +.037 11 12 .030 .030 .031 .032 .033 .033 .034 .035 12 13 .028 .029 .029 .030 .031 .031 .032 .033 13 14 .026 .027 .027 .028 .029 .029 .030 .031 14 15 .024 .025 .026 .026 .027 .027 .028 .029 15 16 +.022 +.023 +.024 +.024 +.025 +.025 +.026 +.026 16 •17 .021 .021 .022 .022 .023 .023 .024 .024 17 18 .019 .019 .020 .020 .021 .021 .022 .022 18 19 .017 .018 .018 .018 .019 .019 .020 .020 19 20 .015 .016 .016 .016 .017 .017 .018 .018 20 21 +.014 +.014 +.014 +.015 +.015 +.015 +.015 +.016 21 22 .012 .012 .012 .013 .013 .013 .013 .014 22 23 .010 .010 .010 .011 .011 .011 .011 .012 23 24 .008 .008 .009 .009 .009 .009 .009 .010 24 25 .006 .007 .007 .007 .007 .007 .007 .007 25 26 +.005 +.005 +.005 +.005 +.005 +.005 +.005 +.005 26 27 .003 .003 .003 .003 .003 .003 .003 .003 27 28 .001 .001 .001 .001 .001 .001 .001 .001 28 29 -.001 -.001 • -.001 -.001 -.001 -.001 -.001 -.001 29 30 .003 .003 .003 .003 .003 .003 .003 .003 30 31 -.005 -.005 -.005 -.005 -.005 -.005 -.005 -.005 31 32 .006 .006 .007 .007 .007 .007 .007 .007 32 33 .008 .008 .008 .009 .009 .009 .009 .010 33 34 .010 .010 .010 .011 .011 .011 .011 .012 34 35 .012 .012 .012 .013 .013 .013 .013 .014 35 36 -.013 -.014 -.014 -.014 -.015 -.015 -.016 -016 36 37 .015 .016 .016 .016 .017 .017 .018 .018 37 38 .017 .017 .018 .018 .019 .019 .020 .020 38 39 .019 .019 .020 .020 .021 .021 .022 .022 39 40 .021 .021 .022 .022 .023 .023 .024 .024 40 41 -.022 -.023 -.024 -.024 -.025 -.025 -.026 -.026 41 42 .024 .025 .025 .026 .027 .027 .028 .028 42 43 .026 .027 .027 .028 .029 .029 .030 .031 43 44 .028 .029 .029 .030 .031 .031 .032 .033 44 45 .030 .030 .031 .032 .033 .033 .034 .035 45 46 -.031 -.032 -.033 -.034 -.035 -.035 -.036 -.037 46 47 .033 .034 .035 .036 .036 .037 .038 .039 47 48 .035 .036 .037 .038 .038 .039 .040 .041 48 49 .037 .038 .039 .040 .040 .041 .042 .043 49 50 .038 .039 .040 .041 .042 .043 .044 .045 50 c 66 REDUCTION OF THE ENGLISH BAROMETER TO THE FREEZING POINT. Degrees of Fah- renheit. English Inches. of Fah- renheit. 20 20.5 21 21.5 22 22.5 23 23.5 o 51 -.040 -.041 -.042 -.043 -.044 -.045 -.046 -.047 o 51 52 .042 .043 .044 .045 .046 .047 .048 .049 52 53 .044 .045 .046 .047 .048 .049 .050 .052 53 54 .046 .047 .048 .049 .050 .051 .052 .054 54 55 .047 .049 .050 .051 .052 .053 .055 .056 55 56 -.049 -.050 -.052 -.053 -.054 -.055 -.057 -.058 56 57 .051 .052 .054 .055 .056 .057 .059 .060 57 58 .053 .054 .055 .057 .058 .059 .061 .062 58 59 .055 .056 .057 .059 .060 .061 .063 .064 59 60 .056 .058 .059 .061 .062 .063 .065 .066 60 61 -.058 -.060 -.061 -.062 -.064 -.065 -.067 -.068 61 62 .060 .061 .063 .064 .066 .067 .069 .070 62 63 .062 .063 .065 .066 .068 .069 .071 .072 63 64 .063 .065 .067 .068 .070 .071 .073 .075 64 65 .065 .067 .068 .070 .072 .073 .075 .077 65 66 -.067 -.069 -.070 -.072 -.074 -.075 -.077 -.079 66 67 .069 .071 .072 .074 .076 .077 .079 .081 67 68 .071 .072 .074 .076 .078 .079 .081 .083 68 69 .072 .074 .076 .078 .080 .081 .083 .085 69 70 .074 .076 .078 .080 .082 .083 .085 .087 70 71 -.076 -.078 -.080 -.082 -.083 -.085 -.087 -.089 71 72 .078 .080 .082 .084 .085 .087 .089 .091 72 73 .079 .081 .083 .085 .087 .089 .091 .093 73 74 .081 .083 .085 .087 .089 .091 .093 .095 74 75 .083 .085 .087 .089 .091 .093 .095 .098 75 76 -.085 -.087 -.089 -.091 -.093 -.095 -.097 -.100 76 77 .087 .089 .091 .093 .095 .097 .100 .102 77 78 .088 .091 .093 .095 .097 .099 .102 .104 78 79 .090 .092 .095 .097 .099 .101 .104 .106 79 80 .092 .094 .096 .099 .101 .103 .106 .108 80 81 -.094 -.096 -.098 -.101 -.103 -.105 -.108 -.110 81 82 .095 .098 .100 .103 .105 .107 .110 .112 82 83 .097 .100 .102 .104 .107 .109 .112 .114 83 84 .099 .101 .104 .106 .109 .111 .114 .116 84 85 .101 .103 .106 .108 .111 .113 116 .118 85 86 -.103 -.105 -.108 -.110 -.113 -.115 -.118 -.120 86 ' 87 .104 .107 .109 .112 .115 .117 .120 .123 87 88 .106 .109 .111 .114 .117 .119 .122 .125 88 89 .108 .111 .113 .116 .119 .121 .124 .127 89 90 .110 .112 .115 .118 .121 .123 .126 .129 90 91 -.111 -.114 -.117 -.120 -.122 -.125 -.128 -.131 91 92 .113 .116 .119 .122 .124 .127 .130 .133 92 93 .115 .118 .121 .124 .126 .129 .132 .135 93 94 .117 .120 .122 .125 .128 .131 .134 .137 94 95 .118 .121 .124 .127 .130 .133 .136 .139 95 96 -.120 -.123 -.126 -.129 -.132 -.135 -.138 -.141 96 97 .122 .125 .128 .131 .134 .137 .140 .143 97 98 .124 .127 .130 .133 .136 .139 .142 .145 98 99 .125 .129 .132 .135 .138 .141 .144 .147 99 100 .127 .130 .134 .137 140 .143 .146 .150 100 67 REDUCTION OF THE ENGLISH BAROMETER TO THE FREEZING POINT. Degrees of Fah- renheit. English Inches. Degrees of Fah- renheit. 24 24.5 25 25.5 26 26.5 27 27.5 o 0 +.061 +.063 +.064 +.065 +.067 +.068 +.069 +.071 o 0 1 .059 .061 .062 .063 .064 .065 .067 .068 1 2 .057 .058 .060 .061 .062 .063 .064 .066 2 3 .055 .056 .057 .059 .060 .061 .062 .063 3 4 .053 .054 .055 .056 .057 .058 .059 .061 4 5 .051 .052 .053 .054 .055 .056 .057 .058 5 6 +.049 +.050 +.051 +.052 +.053 +.054 +.055 +.056 6 7 .046 .047 .048 .049 .050 .051 .052 .053 7 8 . .044 .045 .046 .047 .048 .049 .050 .051 8 9 .042 .043 .044 .045 .046 .046 .047 .048 9 10 .040 .041 .042 .042 .043 .044 .045 .046 10 11 +.038 +.039 +.039 +.040 +.041 +.042 +.042 +.043 11 12 .036 .036 .037 .038 .039 .039 .040 .041 12 13 .033 .034 .035 .036 .036 .037 .038 .038 13 14 .031 .032 .033 .033 .034 .035 .035 .036 14 15 .029 .030 .030 .031 .032 .032 .033 .033 15 16 +.027 +.028 +.028 +.029 +.029 +.030 +.030 +.031 16 17 .025 .025 .026 .026 .027 .027 .028 .028 17 18 .023 .023 .024 .024 .025 .025 .025 .026 18 19 .021 .021 .021 .022 .022 .023 .023 .024 19 20 .018 .019 .019 .020 .020 .020 .021 .021 20 21 +.016 +.017 +.017 +.017 +.018 +.018 +.018 +.019 21 22 .014 .014 .015 .015 .015 .016 .016 .016 22 23 .012 .012 .012 .013 .013 .013 .013 .014 23 24 .010 .010 .010 .010 .011 .011 .011 .011 24 25 .008 .008 .008 .008 .008 .008 .009 .009 25 26 +.005 +.006 +.006 +.006 +.006 +.006 +.006 +.006 26 27 .003 .003 .003 .003 .004 .004 .004 .004 27 28 .001 .001 .001 .001 .001 .001 .001 .001 28 29 -.001 -.001 -.001 -.001 -.001 -.001 -.001 -.001 29 30 .003 .003 .003 .004 .004 .004 .004 .004 30 31 -.005 -.006 -.006 -.006 -.006 -.006 -.006 -.006 31 32 .008 .008 .008 .008 .008 .008 .008 .009 32 33 .010 .010 .010 .010 .011 .011 .011 .011 33 34 .012 .012 .012 .013 .013 .013 .013 .014 34 35 .014 .014 .015 .015 .015 .015 .016 .016 35 36 -.016 -.017 -.017 -.017 -.017 -.018 -.018 -.019 36 37 .018 .019 .019 .019 .020 .020 .021 .021 37 38 .020 .021 .021 .022 .022 .023 .023 .023 38 39 .023 .023 .024 .024 .024 .025 .025 .026 39 40 .025 .025 .026 .026 .027 .027 .028 .028 40 41 -027 -.027 -.028 -.029 -.029 -.030 -.030 -.031 41 42 .029 .030 .030 .031 .031 .032 .033 .033 42 43 .031 .032 .032 .033 .034 .034 .035 .036 43 44 .033 .034 .035 .035 .036 .037 .037 .038 44 45 .035 .036 .037 .038 .038 .039 .040 .041 45 46 -.038 -.038 -.039 -.040 -.041 -.042 -.042 -.043 46 47 .040 .041 .041 .042 .043 .044 .045 .046 47 48 .042 .043 .044 .045 .045 .046 .047 .048 48 49 .044 .045 .046 .047 .048 .049 .050 .050 49 50 .046 .047 .048 .049 .050 .051 .052 .053 50 68 REDUCTION OF THE ENGLISH BAROMETER TO THE FREEZING POINT. Degrees of Fah- renheit. English Inches. Degrees of Fah- renheit. 24 24.5 25 25.5 26 26.5 27 27.5 o 51 -.048 -.049 -.050 -.051 -.052 -.053 -.054 -.055 o 51 52 .050 .052 .053 .054 .055 .056 .057 .058 52 53 .053 .054 .055 .056 .057 .058 .059 .060 53 54 .055 .056 .057 .058 .059 .060 .062 .063 54 55 .057 .058 .059 .060 .062 .063 .064 .065 55 56 -.059 -.060 -.061 -.063 -.064 -.065 -.066 -.068 56 57 .061 .062 .064 .065 .066 .068 .069 .070 57 58 .063 .065 .066 .067 .069 .070 . .071 .073 58 59 .065 .067 .068 .070 .071 .072 .074 .075 59 60 .068 .069 .070 .072 .073 .075 .076 .077 60 61 -.070 -.071 -.073 -.074 -.075 -.077 -.078 -.080 61 62 .072 .073 .075 .076 .078 .079 .081 .082 62 63 .074 .076 .077 .079 .080 .082 .083 .085 63 64 .076 .078 .079 .081 .082 .084 .086 .087 64 65 .078 .080 .082 .083 .085 .086 .088 .090 65 66 -.080 -.082 -.084 -.085 -.087 -.089 -.090 -.092 66 67 .083 .084 .086 .088 .089 .091 .093 .095 67 68 .085 .086 .088 .090 .092 .094 .095 .097 68 69 .087 .089 .090 .092 .094 .096 .098 .100 69 70 .089 .091 .093 .095 .096 .098 .100 .102 70 71 -.091 -.093 -.095 -.097 -.099 -.101 -.102 -.104 71 72 .093 .095 .097 .099 .101 .103 .105 .107 72 73 .095 .097 .099 .101 .103 .105 .107 .109 73 74 .097 .099 .102 .104 .106 .108 .110 .112 74 75 .100 .102 .104 .106 .108 .110 .112 .114 75 76 -.102 -.104 -.106 -.108 -.110 -.112 -.114 -.117 76 77 .104 .106 .108 .110 .112 .115 117 .119 77 78 .106 .108 .110 .113 .115 .117 .119 .122 78 79 .108 .110 .113 .115 .117 .119 .122 .124 79 80 .110 .113 .115 .117 .119 .122 .124 .126 80 81 -.112 -.115 -.117 -.119 -.122 -.124 -.126 -.129 81 82 .114 .117 .119 .122 .124 .126 .129 .131 82 83 .117 .119 .121 .124 .126 .129 .131 .134 83 84 .119 .121 .124 .126 .129 .131 .134 .136 84 85 .121 .123 .126 .128 .131 .133 .136 .139 85 86 -.123 -.126 -.128 -.131 -.133 -.136 -.138 -.141 86 87 .125 .128 .130 .133 .136 .138 .141 .143 87 88 .127 .130 .133 .135 .138 .141 .143 .146 88 89 .129 .132 .135 .137 .140 .143 .146 .148 89 90 .131 .134 .137 .140 .142 .145 .148 .151 90 91 -.134 -.136 -.139 -.142 -.145 -.148 -.150 -.153 91 92 .136 .139 .141 .144 .147 .150 .153 .156 92 93 .138 .141 .144 .147 .149 .152 .155 .158 93 94 .140 .143 .146 .149 .152 .155 .157 .161 94 95 .142 .145 .148 .151 .154 .157 .160 .163 95 96 -.144 -.147 -.150 -.153 -.156 -.159 -.162 -.165 96 97 .146 .149 .152 .156 .159 .162 .165 .168 97 98 .148 .152 .155 .158 .161 .164 .167 .170 98 99 .151 .154 .157 .160 .163 .166 .169 .173 99 100 .153 .156 .159 .162 .165 .169 .172 .175 100 c 69 REDUCTION OF THE ENGLISH BAROMETER TO THE FREEZING POINT. Degrees of Fahren- heit. English Inches. Degrees of Fahren- heit. 28 28.5 29 29.5 30 30.5 31 o 0 +.072 +.073 +.074 +.076 +.077 +.078 +.080 o 0 1 .069 .071 .072 .073 .074 .076 .077 1 2 .067 .068 .069 .070 .072 .073 .074 2 3 .064 .065 .067 .068 .069 .070 .071 3 4 .062 .063 .064 .065 .066 .067 .068 4 5 .059 .060 .061 .062 .063 .065 .066 5 6 +.057 +.058 +.059 +.060 +.061 +.062 +.063 6 7 .054 .056 .056 .057 .058 .059 .060 7 8 .052 .053 .054 .054 .055 .056 .057 8 9 .049 .050 .051 .052 .053 .054 .054 9 10 .047 .047 .048 .049 .050 .051 .052 10 11 +.044 +.045 +.046 +.046 +.047 +.048 +.049 11 12 .042 .042 .043 .044 .045 .045 .046 12 13 .039 .040 .040 .041 .042 .043 .043 13 14 .037 .037 .038 .038 .039 .040 .040 14 15 .034 .035 .035 .036 .036 .037 .038 15 16 +.032 +.032 +.033 +.033 +.034 +.034 +.035 16 17 .029 .030 .030 .031 .031 .032 .032 17 18 .026 .027 .027 .028 .028 .029 .029 18 19 .024 .024 .025 .025 .026 .026 .027 19 20 .021 .022 .022 .023 .023 .023 .024 20 21 +.019 +.019 +.020 +.020 +.020 +.021 +.021 21 22 .016 .017 .017 .017 .018 .018 .018 22 23 .014 .014 .014 .015 .015 .015 .015 23 24 .011 .012 .012 .012 .012 .012 .013 24 25 .009 .009 .009 .009 .009 .010 .010 25 26 +.006 +.006 +.007 +.007 +.007 +.007 +.007 26 27 .004 .004 .004 .004 .004 .004 .004 27 28 .001 .001 .001 .001 .001 .001 .001 28 29 -.001 -.001 -.001 -.001 -.001 -.001 -.001 29 30 .004 .004 .004 .004 .004 .004 .004 30 31 -.006 -.006 -.007 -.007 -.007 -.007 -.007 31 32 .009 .009 .009 .009 .009 .010 .010 32 33 .011 .012 .012 .012 .012 .012 .012 33 34 .014 .014 .014 .015 .015 .015 .015 34 35 .016 .017 .017 .017 .018 .018 .018 35 36 -.019 -.019 -.020 -.020 -.020 -.021 -.021 36 37 .021 .022 .022 .022 .023 .023 .024 37 48 .024 .024 .025 .025 .026 .026 .026 38 39 .026 .027 .027 .028 .028 .029 .029 39 40 .029 .029 .030 .030 .031 .031 .032 40 41 -.031 -.032 -.033 -.033 -.034 -.034 -.035 41 42 .034 .034 .035 .036 .036 .037 .037 42 43 .036 .037 .038 .038 .039 .040 .040 43 44 .039 .040 .040 .041 .042 .042 .043 44 45 .041 .042 .043 .044 .044 .045 .046 45 46 -.044 -.045 -.045 -.046 -.047 -.048 -.049 46 47 .046 .047 .048 .049 .050 .051 .051 47 48 .049 .050 .051 .052 .052 .053 .054 48 49 .051 .052 .053 .054 .055 .056 .057 49 50 .054 .055 .056 .057 .058 .059 .060 50 70 REDUCTION OF THE ENGLISH BAROMETER TO THE FREEZING POINT. Degrees of Fahren- heit. English Inches. Degrees of Fahren- heit. 28 28.5 29 29.5 30 30.5 31 5°1 -.056 -.057 -.058 -.059 -.060 -.061 -.062 & 52 .059 .060 .061 .062 .063 .064 .065 52 53 .061 .063 .064 .065 .066 .067 .068 53 54 .064 .065 .066 .067 .068 .070 .071 54 55 .066 .068 .069 .070 .071 .072 .073 55 56 -.069 -.070 -.071 -.073 -.074 -.075 -.076 56 57 .071 .073 .074 .075 .076 .078 .079 57 58 .074 .075 .077 .078 .079 .081 .082 58 59 .076 .078 .079 .080 .082 .083 .085 59 60 .079 .080 .082 .083 .085 .086 .087 60 61 -.081 -.083 -.084 -.086 -.087 -.089 -.090 61 62 .084 .085 .087 .088 .090 .091 .093 62 63 .086 .088 .089 .091 .093 .094 .096 63 64 .089 .090 .092 .094 .095 .097 .098 64 65 .091 .093 .095 .096 .098 .100 .101 65 66 -.094 -.096 -.097 -.099 -.101 -.102 -.104 66 67 .096 .098 .100 .102 .103 .105 .107 67 68 .099 .101 .102 .104 .106 .108 .109 68 69 .101 .103 .105 .107 .109 .110 .112 69 70 .104 .106 .108 .109 .111 .113 .115 70 71 -.106 -.108 -.110 -.112 -.114 -.116 -.118 71 72 .109 .111 .113 .115 .117 .119 .120 72 73 .111 .113 .115 .117 .119 .121 .123 73 74 .114 .116 .118 .120 .122 .124 .126 74 75 .116 .118 .120 .122 .125 .127 .129 75 76 -.119 -.121 -.123 -.125 -.127 -.129 -.131 76 77 .121 .123 .126 .128 .130 .132 .134 77 78 .124 .126 .128 .130 .133 .135 .137 78 79 .126 .128 .131 .133 .135 .137 .140 79 80 .129 .131 .133 .136 .138 .140 .143 80 81 -.131 -.134 -.136 -.138 -.141 -.143 -.145 81 82 .134 .136 .138 .141 .143 .146 .148 82 83 .136 .139 .141 .143 .146 .148 .151 83 84 .139 .141 .144 .146 .149 .151 .154 84 85 .141 .144 .146 .149 .151 .154 .156 85 86 -.144 -.146 -.149 -.151 -.154 -.156 -.159 86 87 .146 .149 .151 .154 .157 .159 .162 87 88 .149 .151 .154 .157 .159 .162 .165 88 89 .151 .154 .156 .159 .162 .165 .167 89 90 .153 .156 .159 .162 .164 .167 .170 90 91 -.156 -.159 -.162 -.165 -.167 -.170 -173 91 92 .158 .161 .164 .167 .170 .172 .175 92 93 .161 .164 .167 .170 .172 .175 .178 93 94 .163 .166 .169 .172 .175 .177 .180 94 95 .166 .169 .172 .175 .178 .180 .183 95 96 -.168 -.171 -.174 -.178 -.181 -.183 -.186 96 97 .171 .174 .177 .180 .183 .186 .189 97 98 .173 .176 .179 .183 .186 .188 .191 98 99 .176 .179 .182 .185 .188 .191 .194 99 100 .178 .181 .184 .188 .191 .194 .197 100 C 71 TABLE XVIII. FOR REDUCING THE INDICATIONS OF ENGLISH BAROMETERS, WITH WOODEN OR GLASS SCALES, TO THE FREEZING POINT. IN most of the common barometers the scale is engraved upon a short plate o brass, or of ivory, fixed upon the wooden frame of the instrument. In such a case the compound expansion of the two substances can only be guessed at, and the coi rection to be applied to the observations for reducing them to the freezing point can not be determined with precision. As a near approximation for such imperfect instruments, the following table may be used. In computing this table, the expansion; of glass, which is less than that of brass and greater than that of wood, has "beeni substituted for that of brass, as an approximate value for a scale composed of these last, two substances. The table thus gives the true correction, in English inches, | for the barometers, the graduation of which is engraved on the glass tube itself. It j answers equally for any English barometer with wooden scale, whatever be the sub-| stance of which the short plate bearing the graduation is made. CORRECTIONS TO BE APPLIED TO ENGLISH BAROMETERS, WITH WOODEN OR GLASS | SCALES, TO REDUCE THE OBSERVATIONS TO THE FREEZING POINT. Expansion of Mercury for 1° Fahr. = 0.0001001 ; of Glass for 1° Fahr. = 0.00000444. Attached Thermom- eter, Fahren- heit. Barometer in English Inches. 26 26.5 2V 27.5 28 28.5 29 29.5 30 30.5 31 0° +.076 +.077 +.079 +.080 +.082 +.083 +.085 +.086 +.088 + .089 + .090 1 +.073 +.075 +.076 +.078 +.079 + .080 + .082 +.083 + .085 +.086 +.088 2 +.071 +.072 +.074 +.075 +.076 +.078 +.079 +.080 +.082 + .083 +.085 3 +.068 +.070 +.071 +.072 +.074 + .075 +.076 +.078 +.079 +.080 +.082 4 +.066 +.067 +.069 +.070 +.071 + .072 +.074 +.075 +.076 +.077 +.079 5 +.064 + .065 + .066 +.067 +.068 +.070 +.071 +.072 +.073 +.074 +.076 6 +.061 + .062 +.063 +.065 +.066 +.067 +.068 +.069 +.070 +.072 +.073 7 +.059 +.060 + .061 +.062 +.063 +.064 +.065 +.067 +.068 +.069 +.070 8 +.056 +.057 +.058 +.059 +.060 +.061 +.063 +.064 +.065 +.066 +.067 9 +.054 +.055 +.056 +.057 +.058 +.059 +.060 +.061 +.062 +.063 +.064 10 +.05JL + .052 +.053 +.054 +.055 +.056 +.057 +.058 +.059 +.060 + .061 11 +.049 + .050 +.051 +.051 +.052 +.053 +.054 +.055 +.056 +.057 +.058 12 +.046 +.047 +.048 +.049 +.050 +.051 +.052 +.052 +.053 +.054 +.055 13 +.044 +.045 +.045 +.046 +.047 +.048 +.049 +.050 +.050 +.051 +.052 14 +.041 +.042 +.043 +.044 +.044 +.045 +.046 +.047 +.048 +.048 +.049 15 +.039 +.039 +.040 +.041 +.042 +.042 +.043 +.044 +.045 +.045 +.046 16 + .036 +.037 +.038 +.038 +.039 +.040 +.040 +.041 +.042 +.043 +.043 17 +.034 +.034 + .035 +.036 +.036 +.037 +.038 +.038 +.039 +.040 +.040 18 +.031 +.032 +.032 +.033 +.034 +.034 +.035 +.036 +.036 +.037 +.037 19 +.029 +.029 +.030 +.030 +.031 +.032 +.032 +.033 +.033 +.034 +.034 20 +.026 +.027 +.027 +.028 +.028 +.029 +.029 +.030 +.030 +.031 + .031 REDUCTION OF THE ENGLISH BAROMETER TO THE FREEZING POINT. Barometer with Glass or Wooden Scale. Attached Thermom- eter, Fahren- heit. Barometer in English Inches. 26 26.5 27 27.5 28 28.5 29 29.5 30 30.5 31 21° +.024 +.024 +.025 +.025 +.026 +.026 +.027 +.027 +.028 +.028 +.028 22 +.021 +.022 +.022 +.023 +.022 +.023 +.024 + .024 + .025 +.025 +.025 23 +.019 +.019 +.020 +.020 +.020 +.021 +.021 +.021 + .022 +.022 +.023 24 +.016 +.017 +.017 +.017 +.018 +.018 +.018 +.019 +.019 +.019 +.020 25 | +.014 +.014 +.014 +.015 +.015 +.015 +.016 +.016 +.016 +.016 +.017 26 +.011 +.012 +.012 +.012 +.012 +.013 +.013 +.013 +.013 +.013 +.014 27 +.009 +.009 +.009 +.009 +.010 +.010 +.010 +.010 +.010 +.011 +.011 28 +.006 +.007 +.007 +.007 +.007 +.007 +.007 +.007 +.007 +.008 +.008 29 +.004 +.004 +.004 +.004 +.004 +.004 +.004 +.005 +.005 +.005 +.005 30 +.002 +.002 +.002 +.002 +.002 +.002 +.002 +.002 +.002 +.002 +.002 31 -.001 -.001 -.001 -.001 -.001 -.001 -.001 -.001 -.001 -.001 -.001 32 -.003 -.004 -.004 -.004 -.004 -.004 -.004 -.004 -.004 -.004 -.004 33 -.006 -.006 -.006 -.006 -.006 -.007 -.007 -.007 -.007 -.007 -.007 34 -.008 -.009 -.009 -.009 -.009 -.009 -.009 -.010 -.010 -.010 -.010 35 -.011 -.011 -.011 -.012 -.012 -.012 -.012 -.012 -.013 -.013 -.013 36 -.013 -.014 -.014 -.014 -.014 -.015 -.015 -.015 -.CIS -.016 -.016 37 -.016 -.016 -.017 -.017 -.017 -.017 -.018 -.018 -.018 -.019 -.019 38 -.018 -.019 -.019 -.019 -.020 -.020 -.020 -.021 -.021 -.022 -.022 39 -.021 -.021 -.022 -.022 -.022 -.023 -.023 -.024 -.034 -.024 -.025 40 -.023 -.024 -.024 -.025 -.025 --.026 -.026 -.026 -.027 -.027 -.028 41 -.026 -.026 -.027 -.027 -.028 -.028 -.029 -.029 -.030 -.030 -.031 42 -.028 -.029 -.029 -.030 -.030 -.031 -.032 -.032 -.033 -.033 -.034 43 -.031 -.031 -.032 -.033 -.033 -.034 -.033 -.035 -.036 -.036 -.037 44 -.033 -.034 -.035 -.035 -:036 -.036 -.036 -.038 -.038 -.039 -.040 45 -.036 -.036 -.037 -.038 -.038 -.039 -.039 -.041 -.041 -.042 -.043 46 -.038 -.039 -.040 -.040 -.041 -.042 -.042 -.043 -.044 -.045 -.046 47 -.041 -.041 -.042 -.043 -.044 -.045 -.044 -.046 -.047 -.048 -.049 48 -.043 -.044 -.045 -.046 -.047 -.047 -.047 -.049 -.050 -.051 -.051 49 -.046 -.046 -.047 -.048 -.049 -.050 -.050 -.052 -.053 -.054 -.054 50 -.048 -.049 -.050 -.051 -.052 -.053 -.054 -.055 -.056 -.056 -.057 51 -.051 -.052 -.053 -.054 -.055 -.055 -.056 -.057 -.058 -.059 -.060 52 -.053 -.054 -.055 -.056 -.057 -.058 -.059 -.060 -.061 -.062 -.063 53 -.056 -.057 -.058 -.059 -.060 -.061 -.062 -.063 -.064 -.065 -.066 54 -.058 -.059 -.060 -.061 -.063 -.064 -.065 -.066 -.067 -.068 -.069 55 -.061 -.062 -.063 -.064 -.065 -.066 -.068 -.069 -.070 -.071 -.072 56 -.063 -.064 -.065 -.067 -.068 -.069 -.070 -.071 -.073 -.074 -.075 57 -.065 -.067 -.068 -.069 -.071 -.072 -.073 -.074 -.076 -.077 -.078 158 -.068 -.069 -.071 -.072 -.073 -.074 -.076 -.077 -.078 -.080 -.081 59 -.070 -.072 -.073 -.074 -.076 -.077 -.079 -.080 -.081 -.083 -.084 60 -.073 -.074 -.076 -.077 -.079 -.080 -.081 -.083 -.084 -.085 -.087 73 REDUCTION OF THE ENGLISH BAROMETER TO THE FREEZING POINT. Barometer with Glass or Wooden Scale. Attached Thermom- eter, Fahren- heit. Barometer in English Inches. 26 26.5 27 27.5 28 28.5 29 29.5 30 30.5 31 0 61 -.075 -.077 -.078 -.080 -.081 -.083 -.084 -.086 -.087 -.088 -.090 62 -.078 -.079 -.081 -.082 -.084 -.085 -.087 -.088 -.090 -.091 -.093 63 -.080 -.082 -.083 -.085 -.086 -.088 -.090 -.091 -.093 -.094 -.096 64 -.083 -.084 -.086 -.088 -.089 -.091 -.092 -.094 -.096 -.097 -.099 65 -.085 -.087 -.089 -.090 -.092 -.093 -.095 -.097 -.098 -.100 -.102 66 -.088 -.089 -.091 -.093 -.094 -.096 -.098 -.100 -.101 -.103 -.104 67 -.090 -.092 -.094 -.095 -.097 -.099 -.101 -.102 -.104 -.106 -.108 68 -.093 -.094 -.096 -.098 -.100 -.102 -.103 -.105 -.107 -.109 -.110 69 -.095 -.097 -.099 -.101 -.102 -.104 -.106 -.108 -.110 -.112 -.113 70 -.098 -.099 -.101 -.103 -.105 -.107 -.109 -.111 -.113 -.114 -.116 71 -.100 -.102 -.104 -.106 -.108 -.110 -.112 -.114 -.115 -.117 -.119 72 -.103 -.105 -.106 -.108 -.110 -.112 -.114 -.116 -.118 -.120 -.122 73 -.105 -.107 -.109 -.111 -.113 -.115 -.117 -.119 -.121 -.123 -.125 74 -.107 -.110 -.112 -.114 -.116 -.118 -.120 -.122 -.124 -.126 -.128 75 -.110 -.112 -.114 -.116 -.118 -.121 -.123 -.125 -.127 -.129 -.131 76 -.112 -.115 -.117 -.119 -.121 -.123 -.125 -.128 -.130 -.132 -.134 77 -.115 -.117 -.119 -.121 -.124 -.126 -.128 -.130 -.133 -.135 -.137 78 -.117 -.120 -.122 -.124 -.126 -.129 -.131 -.133 -.135 -.138 -.140 79 -.120 -.122 -.124 -.127 -.129 -.131 -.134 -.136 -.138 -.141 -.143 80 -.122 -.125 -.127 -.129 -.132 -.134 -.136 -.139 -.141 -.143 -.146 81 -.125 -.127 -.130 -.132 -.134 -.137 -.139 -.142 -.144 -.146 -.149 82 -.127 -.130 -.132 -.135 -.137 -.139 -.142 -.144 -.147 -.149 -.152 83 -.130 -.132 -.135 -.137 -.140 -.142 -.145 -.147 -.150 -.152 -.155 84 -.132 -.135 -.137 -.140 -.142 -.145 -.147 -.150 -.152 -.155 -.158 85 -.135 -.137 -.140 -.142 -.145 -.147 -.150 -.153 -.155 -.158 -.160 86 -.137 -.140 -.142 -.145 -.148 -.150 -.153 -.155 -.158 -.161 -.163. 87 -.139 -.142 -.145 -.148 -.150 -.153 -.156 -.158 -.161 -.164 -.166 88 -.142 -.145 -.147 -.150 -.153 -.156 -.158 -.161 -.164 -.167 -.169 89 -.144 -.147 -.150 -.153 -.156 -.158 -.161 -.164 -.167 -.169 -.172 90 -.147 -.150 -.153 -.155 -.158 -.161 -.164 -.167 -.169 -.172 -.175 91 -.149 -.152 -.155 -.158 -.161 -.164 -.167 -.169 -.172 -.175 -.178 92 -.152 -.155 -.158 -.161 -.163 -.166 -.169 -.172 -.175 -.178 -.181 93 -.154 -.157 -.160 -.163 -.166 -.169 -.172 -.175 -.178 -.181 -.184 94 -.157 -.160 -.163 -.166 -.169 -.172 -.175 -.178 -.181 -.184 -.187 95 -.159 -.162 -.165 -.168 -.171 -.174 -.178 -.181 -.184 -.187 -.190 96 -.162 -.165 -.168 -.171 -.174 -.177 -.180 -.183 -.186 -.190 -.193 97 -.164 -.167 -.170 -.174 -.177 -.180 -.183 -.186 -.189 -.192 -.196 98 -.167 -.170 -.173 -.176 -.179 -.183 -.186 -.189 -.192 -.195 -.199 99 -.169 -.172 -.175 -.179 -.182 -.185 -.188 -.192 -.195 -.198 -.201 100 -.171 -.175 -.178 -.181 -.185 -.188 -.191 -.194 -.198 -.201 -.204 74 XIX. METRICAL BAROMETER. TABLE FOE REDUCING -TO THE FREEZING POINT THE BAROMETRICAL COLUMN, c MEASURED BY BRASS SCALES, EXTENDING FROM THE CISTERN TO THE TOP; CALCULATED FROM 260 TO 865 MILLIMETRES, AND FOR EACH DEGREE CENTIGRADE. BY M. T. DELCROS. 73' TABLE XIX. THIS table has been calculated by using the following coefficients of dilatation : — Brass, linear dilatation, from Laplace and Lavoisier for 100° C. = 0.0018782. Mercury, dilatation in volume, from Dulong and Petit for 100° C. = 0.0180180. Dilatation of the mercurial column for 100° C. . . . = 0.0161398. Dilatation of the mercurial column for 1° C. . . = 0.0001614. Observed height reduced to freezing point, H=h — h (0.0001614). T=h — h (a-jy. The second term of this last formula is given by the table, when the temperature 1 and the height h of the barometer are known ; this correction must be subtracted om the observed height A, whea the temperature is above freezing point ; it is to be ided when the temperature is below zero, or freezing point. This table allows the barometrical heights taken at the highest summits, and in the jepest mines, to be corrected. Examples of Calculation. mm. Barometer, observed height, ..... 567.49 Temperature of the barometer, -}-120.7. o nun. f for 10.0=0.912 Second page, 5 for 2.0 = 0.182 C for 0.7 = 0.064 Total, = 1.158 Subtractive correction, ...... Barometer at zero, mm. Barometer, observed height, 454.17 Temperature of the barometer, — 7°.8. First page, < o mm. for 7.0 = 0.514 for 0.8 = 0.059 Total, = 0.573 Additive correction, Barometer at zero, 75 XIX. REDUCTION OF THE BAROMETER TO THE FREEZING POINT. Height of the TEMPERATURE CENTIGRADE. Barome ter. 1° 2° 3° 4° 5° 6° t8 8° 9° Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 260 0.042 0.084 0.126 0.168 0.210 0.252 0.294 0.336 0.378 265 0.043 0.086 0.128 0.171 0.214 0.257 0.299 0.342 0.385 270 0.044 0.087 0.131 0.174 0.218 0.261 0.305 0.349 0.392 275 0.044 0.089 0.133 0.178 0.222 0.266 0.311 0.355 0.399 280 0.045 0.090 0.136 0.181 0.226 0.271 0.316 0.362 0.407 285 0.046 0.092 0.138 0.184 0.230 0.276 0.322 0.368 0.414 290 0.047 0.094 0.140 0.187 0.234 0.281 0.328 0.374 0.421 295 0.048 0.095 0.143 0.190 0.238 0.286 0.333 0.381 0.428 300 0.048 0.097 0.145 0.194 0.242 0.291 0.339 0.387 0.436 305 0.049 0.098 0.148 0.197 0.246 0.295 0.345 0.394 0.443 310 0.050 0.100 0.150 0.200 0.250 0.300 0.350 0.400 0.450 315 0.051 0.102 0.152 0.203 0.254 0-305 0.356 0.407 0.458 320 0.052 0.103 0.155 0.207 0.258 0.310 0.361 0.413 0.465 325 0.052 0.105 0.157 0.210 0.262 0.315 0.367 0.420 0.472 330 0.053 0.106 0.160 0.213 0.266 0.320 0.374 0.426 0.479 335 0.054 0.108 0.162 0.216 0.270 0.324 0.379 0.432 0.487 340 0.055 0.110 0.165 0.219 0.274 0.329 0.384 0.439 0.494 345 0.056 0.111 0.167 0.223 0.278 0.334 0.390 0.445 0.501 350 0.056 0.113 0.169 0.226 0.282 0.339 0.395 0.452 0.508 355 0.057 0.115 0.172 0.229 0.286 0.344 0.401 0.458 0.516 360 0.058 0.116 0.174 0.232 0.290 0.349 0.407 0.465 0.523 365 0.059 0.118 0.177 0.236 0.294 0.353 0.412 0.471 0.530 370 0.060 0.119 0.179 0.239 0.299 0.358 0.418 0.478 0.537 375 0.060 0.121 0.182 0.242 0.303 0.363 0.424 0.484 0.545 380 0.061 0.123 0.184 0.245 0.307 0.368 0.429 0.491 0.552 385 0.062 0.124 0.186 0.249 0.311 0.373 0.435 0.497 0.559 390 0.063 0.126 0.189 0.252 0.315 0.378 0.441 0.504 0.566 395 0.064 0.127 0.191 0.255 0.319 0.382 0.446 0.510 0.574 400 0.065 0.129 0.194 0.258 0.323 0.387 0.452 0.516 0.581 405 0.065 0.131 0.196 0.261 0.327 0.392 0.457 0.523 0.588 410 0.066 0.132 0.198 0.265 0.331 0.397 0.463 0.529 0.596 415 0.067 0.134 0.201 0.268 0.335 0.402 0.469 0.536 0.603 420 0.068 0.136 0.203 0.271 0.339 0.407 0.474 0.542 0.610 425 0.068 0.137 0.206 0.274 0.343 0.411 0.480 0.549 0.617 430 0.069 0.139 0.208 0.278 0.347 0.416 0.486 0.555 0.625 435 0.070 0.140 0.211 0.281 0.351 0.421 0.491 0.562 0.632 440 0.071 0.142 0.213 0.284 0.355 0.426 0.497 0.568 0.639 445 0.072 0.144 0.215 0.287 0.359 0.431 0503 0.574 0.646 450 0.073 0.145 0.218 0.290 0.363 0.436 0.508 0.581 0.654 455 0.073 0 147 0.220 0.294 0.367 0.441 0.514 0.587 0.661 1° 2° '3° 4° 5° 63 7° 8° 9° 76 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. Height of the Barome- ter. TEMPERATURE CENTIGRADE. 1° 2° 3° 4° 5° 6° 7° 8° 9° Millim. 460 Millim. 0.0742 Millim. 0.1485 Millim. 0.2227 Millim. 0.2970 Millim. 0.371 Millim. 0.445 Millim. 0.520 Millim. 0.594 Millim. 0.668 465 0.0750 0.1501 0.2251 0.3002 0.375 0.450 0.525 0.600 0.675 470 0.0759 0.1517 0.2276 0.3034 0.379 0.455 0.531 0.607 0.683 475 0.0767 0.1533 0.2300 0.3066 0.383 0.460 0.537 0.613 0.690 480 0.0775 0.1549 0.2324 0.3099 0.387 0.465 0.542 0.620 0.697 485 0.0783 0.1565 0.2348 0.3131 0.391 0.470 0.548 0.626 0.704 490 0.0791 0.1582 0.2373 0.3163 0.395 0.474 0.554 0.633 0.712 495 0.0800 0.1598 0.2397 0.3195 0.399 0.479 0.559 0.639 0.719 500 0.0807 0.1614 0.2421 0.3228 0.403 0.484 0.565 0.646 0.726 505 0.0815 0.1630 0.2445 0.3260 0.407 0.489 0.570 0.652 0.734 510 0.0823 0.1646 0.2469 0.3293 0.412 0.494 0.576 0.658 0.741 515 0.0831 0.1662 0.2493 0.3325 0.416 0.499 0.582 0.665 0.748 520 0.0839 0.1679 0.2518 0.3357 0.420 0.504 0.587 0.671 0.755 525 0.0847 0.1695 0.2542 0.3389 0.424 0.508 0.593 0.678 0.763 530 0.0855 0.1711 0.2566 0.3422 0.428 0.513 0.599 0.684 0.770 535 0.0863 0.1727 0.2590 0.3454 0.432 0.518 0.604 0.691 0.777 540 0.0872 0.1743 0.2615 0.3486 0.436 0.523 0.610 0.697 0.784 545 0.0879 0.1759 0.2639 0.3518 0.440 0.528 0.616 0.704 0.792 550 0.0888 0.1775 0.2663 0.3551 0.444 0.533 0.621 0.710 0.799 555 0.0896 0.1791 0.2687 0.3583 0.448 0.537 0.627 0.717 0.806 560 0.0904 0.1808 0.2712 0.3615 0.452 0.542 0.633 0.723 0.813 565 0.0912 0.1824 0.2736 0.3647 0.456 0.547 0.638 0.730 0.821 570 0.0920 0.1840 0.2760 0.3680 0.460 0.552 0.644 0.736 0.828 575 0.0928 0.1856 0.2784 0.3712 0.464 0.557 0.650 0.742 0.835 580 0.0936 0.1872 0.2808 0.3744 0.468 0.562 0.655 0.749 0.842 585 0.0944 0.1888 0.2833 0.3777 0.472 0.566 0.661 0.755 0.850 590 0.0952 0.1904 0.2857 0.3809 0.476 0.571 0.667 0.762 0.857 595 0.0960 0.1921 0.2881 0.3841 0.480 0.576 0.672 0.768 0.864 600 0.0968 0.1937 0.2905 0.3874 0.484 0.581 0.678 0.775 0.872 605 0.0976 0.1953 0.2929 0.3906 0.488 0.586 0.683 0.781 0.879 610 0.0985 0.1969 0.2954 0.3938 0.492 0.591 0.689 0.788 0.886 615 0.0993 0.1985 0.2978 0.3970 0.496 0.595 0.695 0.794 0.893 620 0.1001 0.2001 0.3002 0.4003 0.500 0.600 0.700 0.800 0.901 625 0.1009 0.2017 0.3026 0.4035 0.504 0.605 0.706 0.807 0.908 630 0.1017 0.2034 0.3050 0.4067 0.508 0.610 0.712 0.813 0.915 635 0.1025 0.2050 0.3074 0.4099 0.512 0.615 0.717 0.820 0.922 640 0.1033 0.2066 0.3099 0.4132 0.516 0.620 0.723 0.826 0.930 645 0.1041 0.2082 0.3123 0.4164 0.520 0.625 0.729 0.833 0.937 650 0.1049 0.2098 0.3147 0.4196 0.524 0.629 0.734 0.839 0.944 655 0.1057 0.2114 0.3172 0.4229 0.529 0.634 0.740 0.846 0.951 660 0.1065 0.2130 0.3196 0.4261 0.533 0.639 0.746 0.852 0.959 1° 2° 3° 4° 5° 6° 7° 8° 9° c 77 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. TEMPERATURE CENTIGRADE. Height of the Barome- ter. 1° 2° 3° 4° 5° 63 7° 8° 9° Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 665 0.1073 0.2146 0.3220 0.4293 0.537 0.644 0.751 0.859 0.966 670 0.1081 0.2163 0.3244 0.4326 0.541 0.649 0.757 0.865 0.973 675 0.1089 0.2179 0.3268 0.4358 0.545 0.654 0.763 0.871 0.980 680 0.1097 0.2195 0.3292 0.4390 0.549 0.658 0.768 0.878 0.988 685 0.1106 0.2211 0.3317 0.4423 0.553 0.663 0.774 0.884 0.995 690 0.1114 0.2227 0.3341 0.4455 0.557 0.668 0.780 0.891 1.002 695 0.1122 0.2233 0.3365 0.4487 0.561 0.673 0.785 0.897 1.010 700 0.1130 0.2260 0.3389 0.4520 0.565 0.678 0.791 0.904 1.017 705 0.1138 0.2276 0.3414 0.4552 0.569 0.683 0.797 0.910 1.024 710 0.1146 0.2292 0.3438 0.4584 0.573 0.688 0.802 0.917 1.031 715 0.1154 0.2308 0.3462 0.4616 0.577 0.691 0.808 0.923 1.039 720 0.1162 0.2324 0.3486 0.4648 0.581 0.697 0.813 0.930 1.046 725 0.1170 0.2340 0.3510 0.4680 0.585 0.702 0.819 0.936 1.053 730 0.1178 0.2356 0.3535 0.4713 0.589 0.707 0.825 0.943 1.060 735 0.1186 0.2372 0.3559 0.4745 0.593 0.712 0.830 0.949 1.068 740 0.1104 0.2389 0.3583 0.4777 0.597 0.717 0.836 0.955 1.075 745 0.1202 0.2405 0.3607 0.4809 0.601 0.721 0.842 0.962 1.082 750 0.1210 0.2421 0.3631 0.4842 0.605 0.726 0.847 0.968 1.089 755 0.1218 0.2437 0.3655 0.4874 0.609 0.731 0.853 0.975 1.097 760 0.1227 0.2453 0.3680 0.4906 0.613 0.736 0.859 0.981 1.104 765 0.1235 0.2469 0.3704 0.4939 0.617 0.741 0.864 0.988 1.111 770 0.1243 0.2486 0.3728 0.4971 0.621 0.746 0.870 0.994 1.118 775 0.1251 0.2502 0.3752 0.5003 0.625 0.750 0.876 1.001 1.126 780 0.1259 0.2518 0.3777 0.5036 0.629 0.755 0.881 1.007 1.133 785 0.1267 0.2534 0.3801 0.5068 0.633 0.760 0.888 1.014 1.140 790 0.1275 0.2550 0.3825 0.5100 0.637 0.765 0.893 1.020 1.148 795 0.1283 0.2566 0.3849 0.5132 0.641 0.770 0.898 1.026 1.155 800 0.1291 0.2582 0.3874 0.5165 0.646 0.775 0.904 1.033 1.162 805 0.1299 0.2598 0.3898 0.5197 0.650 0.780 0.909 1.039 1.169 810 0.1307 0.2615 0.3922 0.5230 0.654 0.784 0.915 1.046 1.177 815 0.1315 0.2621 0.3946 0.5262 0.658 0.789 0.921 1.052 1.184 820 0.1323 0.2647 0.3970 0.5294 0.662 0.794 0.926 1.059 .191 825 0.1331 0.2653 0.3994 0.5326 0.666 0.799 0.932 1.065 .198 830 0.1340 0.2679 0.4019 0.5358 0.670 0.804 0.938 1.072 .206 835 0.1348 0.2695 0.4043 0.5391 0.674 0.809 0.943 1.078 .213 840 0.1356 0.2712 0.4067 0.5423 0.678 0.813 0.949 1.085 .220 845 0.1364 0.2728 0.4091 0.5455 0.682 0.818 0.955 1.091 .227 850 0.1372 0.2744 0.4116 0.5488 0.686 0.823 0.960 1.097 .235 855 0.1380 0.2760 0.4140 0.5520 0.690 0.828 0.966 1.104 .242 860 0.1388 0.2776 0.4164 0.5552 0.694 0.833 0.972 1.110 .249 865 0.1396 0.2792 0.4188 0.5584 0.698 0.838 0.977 1.117 1.256 1° 2° 3° 40 5° 6° 7° 8° 9D 78 XX. METRICAL BAROMETER. TABLE FOR REDUCING TO THE FREEZING POINT THE BAROMETRICAL COLUMN, MEASURED BY BRASS SCALES, EXTENDING FROM THE CISTERN TO THE TOP ; CAL- CULATED FOR THE HEIGHTS BETWEEN 605 AND 800 MILLIMETRES, AND FOR EVERY TENTH OF A DEGREE, FROM 0° TO + AND - 35° CENTIGRADE. BY M. T. HAEGHENS. 79 TABLE XX. THIS table has been calculated by using the same coefficients of dilatation as in the preceding table, viz. : — Brass, linear dilatation, from Laplace and Lavoisier for 100° C.= 0.0018782. Mercury, dilatation in volume, from Dulong and Petit for 100° C.= 0.0180180. Dilatation of the mercurial column for 100° C. . . . =0.0161398. Dilatation of the mercurial column for 1°C. . . . = 0.0001614. This table, calculated for the reduction of long series of meteorological observa- tions, gives immediately the value of the correction for each tenth of a degree up to 35° C. above, and down to 35° C. below, the freezing point, and for mercurial columns extending from 605 to 800 millimetres. Examples of Calculation. Barometer, observed height, ..... 754.17 Temperature of the attached thermometer, -}-170.8. For finding the correction, seek in the horizontal column, headed barometer, at the head of the pages, the corresponding height of the barometer; it will be found, p. 31, barometer 755mm- (from 752.50 to 757.50) ; next seek in the first vertical column, containing the temperatures, 17°, follow then horizontally this line as far as the col- umn of 8 tenths, and you find there 2.17 millimetres, which is the correction, or the quantity to be subtracted for reducing the observed height to zero. We have thus : — mm. Observed height, 754.17 Subtr 'active correction for +17°.8 = . ; ._ . — 2.17 Barometer at zero, 752.00 If the temperature is below zero, the correction will be additive. mm. Observed height, 729.72 Temperature of the attached thermometer, — 8°.4. Additive correction, -f-0.99 Barometer at zero, 730.71 XX. REDUCTION OF THE BAROMETER TO THE FREEZING POINT. BAROMETER: 605mm- (from 602.51 to 607.50). Centi- grade Degrees Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0 Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. \ 0 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 1 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 2 0.20 0.21 0.21 0.22 0.23 0.24 0.25 0.26 0.27 0.28 3 0.29 0.30 0.31 0.32 0.33 0.34 0.35 0.36 0.37 0.38 4 0.39 0.40 0.41 0.42 0.43 0.44 0.45 0.46 0.47 0.48 5 0.49 0.50 0.51 0.52 0.53 0.54 0.55 0.56 0.57 0.58 6 0.59 0.60 0.61 0.62 0.63 0.63 0.64 0.65 0.66 0.67 7 0.68 0.69 0.70 0.71 0.72 0.73 0.74 0.75 0.76 0.77 8 0.78 0.79 0.80 0.81 0.82 0.83 0.84 0.85 0.86 0.87 9 0.88 0.89 0.90 0.91 0.92 0.93 0.94 0.95 0.96 0.97 10 0.98 0.99 1.00 1.01 1.02 1.03 1.04 1.05 1.05 1.06 11 1.07 1.08 .09 .10 1.11 1.12 .13 .14 1.15 1.16 12 1.17 .18 .19 .20 .21 1.22 .23 .24 1.25 1.26 13 .27 .28 .29 .30 .31 1.32 .33 .34 1.35 .36 14 .37 .38 .39 .40 .41 1.42 .43 .44 1.45 .46 15 .46 .47 .48 .49 .50 1.51 .52 .53 1.54 .55 1ft .56 .57 .58 .59 .60 1.61 1.62 .63 1.64 .65 17 .66 .67 .68 .69 .70 1.71 1.72 .73 1.74 .75 18 .76 .77 .78 .79 .80 1.81 1.82 .83 1.84 .85 19 .86 .87 .87 1.88 1.89 1.90 1.91 .92 1.93 .94 20 .95 .96 .97 1.98 1.99 2.00 2.01 2.02 2.03 2.04 21 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 22 2.15 2.16 2.17 2.18 2.19 2.20 2.21 2.22 2.23 2.24 23 2.25 2.26 2.27 2.28 2.29 2.29 2.30 2.31 2.32 2.33 24 2.34 2.35 2.36 2.37 2.38 2.39 2.40 2.41 2.42 2.43 25 2.44 2.45 2.46 2.47 2.48 2.49 2.50 2.51 2.52 2.53 26 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.61, 2.62 2.63 27 2.64 2.65 2.66 2.67 2.68 2.69 2.70 2.71 2.71 2.72 28 2.73 2.74 2.75 2.76 2.77 2.78 2.79 2.80 2.81 2.82 29 2.83 2.84 2.85 2.86 2.87 2.88 2.89 2.90 2.91 2.92 30 2.93 2.94 2.95 2.96 2.97 2.98 2.99 3.00 3.01 3.02 31 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 32 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 3.20 3.21 33 3.22 3.23 3.24 3.25 3.26 3.27 3.28 3.29 3.30 3.31 34 3.32 3.33 3.34 3.35 3.36 3.37 3.38 3.39 3.40 3.41 35 3.42 3.43 3.44 3.45 3.46 3.47 3.48 3.49 3.50 3.51 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 82 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. BAROMETER: 610mm- (from 607.51 to 612.50). Centi- grade Degrees. Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. o Millim. MilUm. Milli'm. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 1 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 2 0.20 0.21 0.22 0.23 0.24 0.25 0.26 0.27 0.28 0.29 3 0.30 0.31 0.32 0.32 0.33 0.34 0.35 0.36 0.37 0.38 4 0.39 0.40 0.41 0.42 0.43 0.44 0.45 0.46 0.47 0.48 5 0.49 0.50 0.51 0.52 0.53 0.54 0.55 0.56 0.57 0.58 6 0.59 0.60 0.61 0.62 0.63 0.64 0.65 0.66 0.67 0.68 7 0.69 0.70 0.71 0.72 0.73 0.74 0.75 0.76 0.77 0.78 8 0.79 0.80 0.81 0.82 0.83 0.84 0.85 0.86 0.87 0.88 9 0.89 0.90 0.91 0.92 0.93 0.94 0.95 0.96 0.96 0.97 10 0.98 0.99 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 11 1.08 1.09 1.10 1.11 1.12 .13 .14 .15 .16 1.17 12 1.18 1.19 1.20 1.21 1.22 .23 .24 .25 .26 1.27 13 1.28 1.29 1.30 1.31 1.32 .33 .34 .35 .36 1.37 14 1.38 1.39 1.40 1.41 1.42 .43 .44 .45 .46 1.47 15 1.48 1.49 1.50 1.51 1.52 .53 .54 .55 .56 1.57 16 1.58 1.59 .59 1.60 1.61 .62 .63 .64 .65 1.66 17 1.67 1.68 .69 1.70 1.71 .72 .73 .74 .75 1.76 18 1.77 1.78 .79 1.80 1.81 .82 .83 .84 .85 1.86 19 1.87 1.88 .89 1.90 1.91 1.92 .93 .94 1.95 1.96 20 1.97 1.98 .99 2.00 2.01 2.02 2.03 2.04 2.05 2.06 21 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 2.15 2.16 22 2.17 2.18 2.19 2.20 2.21 2.22 2.23 2.23 2.24 2.25 23 2.26 2.27 2.28 2.29 2.30 2.31 2.32 2.33 2.34 2.35 24 2.36 2.37 2.38 2.39 2.40 2.41 2.42 2.43 2.44 2.45 25 2.46 2.47 2.48 2.49 2.50 2.51 2.52 2.53 2.54 2.55 26 2.56 2.57 2.58 2.59 2.60 2.61 2.62 2.63 2.64 2.65 27 2.66 2.67 2.6S 2.69 2.70 2.71 2.72 2.73 2.74 2.75 28 2.76 2.77 2.78 2.79 2.80 2.81 2.82 2.83 2.84 2.85 29 2.86 2.86 2.87 2.88 2.89 2.90 2.91 2.92 2.93 2.94 30 2.95 2.96 2.97 2.98 2.99 3.00 3.01 3.02 3.03 3.04 31 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 3.13 3.14 32 3.15 3.16 3.17 3.18 3.19 3.20 3.21 3.22 3.23 3.24 33 3.25 3.26 3.27 3.28 3.29 3.30 3.31 3.32 3.33 3.34 34 3.35 3.36 3.37 3.38 3.39 3.40 3.41 3.42 3.43 3.44 35 3.45 3.46 3.47 3.48 3.49 3.50 3.51 3.52 3.53 3.54 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 83 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. BAROMETER: 615ram- (from 612.51 to 617.50). Centi- grade Degrees. Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. S. 9. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 1 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 2 0.20 0.21 0.22 0.23 0.24 0.25 0.26 0.27 0.28 0.29 3 0.30 0.31 0.32 0.33 0.34 0.35 0.36 0.37 0.38 0.39 4 0.40 0.41 0.42 0.43 0.44 0.45 0.46 0.47 0.48 0.49 5 0.50 0.51 0.52 0.53 0.54 0.55 0.56 0.57 0.58 0.59 6 0.60 0.61 0.62 0.63 0.64 0.65 0.66 0.67 0.68 0.68 7 0.69 0.70 0.71 0.72 0.73 0.74 0.75 0.76 0.77 0.78 8 0.79 0.80 0.81 0.82 0.83 0.84 0.85 0.86 0.87 0.88 9 0.89 0.90 0.91 0.92 0.93 0.94 0.95 0.96 0.97 0.98 10 0.99 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 11 .09 .10 1.11 1.12 .13 1.14 .15 1.16 1.17 1.18 12 .19 .20 1.21 1.22 .23 1.24 .25 1.26 1.27 1.28 13 .29 .30 1.31 1.32 .33 1.34 .35 1.36 1.37 1.38 14 .39 .40 1.41 1.42 .43 1.44 .45 1.46 1.47 1.48 15 .49 .50 1.51 1.52 .53 1.54 .55 1.56 1.57 1.58 16 .59 1.60 1.61 1.62 .63 1.64 .65 1.66 1.67 1.68 17 .69 1.70 1.71 1.72 .73 1.74 .75 1.76 1.77 1.78 18 .79 1.80 1.81 1.82 1.83 1.84 .85 1.86 1.87 1.88 19 1.89 1.90 1.91 1.92 1.93 1.94 1.95 1.96 1.97 1.98 20 1.99 2.00 2.01 2.01 2.02 2.03 2.04 2.05 2.06 2.07 21 2.08 2.09 2.10 2.11 2.12 2.13 2.14 2.15 2.16 2.17 22 2.18 2.19 2.20 2.21 2.22 2.23 2.24 2.25 2.26 2.27 23 2.28 2.29 2.30 2.31 2.32 2.33 2.34 2.35 2.36 2.37 24 2.38 2.39 2.40 2.41 2.42 2.43 2.44 2.45 2.46 2.47 25 2.48 2.49 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 26 2.58 2.59 2.60 2.61 2.62 2.63 2.64 2.65 2.66 2.67 27 2.68 2.69 2.70 2.71 2.72 2.73 2.74 2.75 2.76 2.77 28 2.78 2.79 2.80 2.81 2.82 2.83 2.84 2.85 2.86 2.87 29 2.88 2.89 2.90 2.91 2.92 2.93 2.94 2.95 2.96 2.97 30 2.98 2.99 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 31 3.08 3.09 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 32 3.18 3.19 3.20 3.21 3.22 3.23 3.24 3.25 3.26" 3.27 33 3.28 3.29 3.30 3.81 3.32 3.33 3.34 3.35 3.36 3.36 34 3.37 3.38 3.39 3.40 3.41 3.42 3.43 3.44 3.45 3.46 35 3.47 3.48 3.49 3.50 3.51 3.52 3.53 3.54 3.55 3.56 0. 1. 2. 3. 4. 5. 6. •7. 8. 9. 84 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. Centi- grade Degrees. BAROMETER: 620rara- (from 617.51 to 622.50) Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. S. 9. o 0 Millim. 0.00 Millim. 0.01 Millim. 0.02 Millim. 0.03 Millim. 0.04 Millim. 0.05 Millim. 0.06 Millim. 0.07 Millim 0.08 Millim. 0.09 1 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 2 0.20 0.21 0.22 0.23 0.24 0.25 0.26 0.27 0.28 0.29 3 0.30 0.31 0.32 0.33 0.34 0.35 0.36 0.37 0.38 0.39 4 0.40 0.41 0.42 0.43 0.44 0.45 0.46 0.47 0.48 0.49 5 0.50 0.51 0.52 0.53 0.54 0.55 0.56 0.57 0.58 0.59 6 0.60 0:61 0.62 0.63 0.64 0.65 0.66 0.67 0.68 0.69 7 0.70 0.71 0.72 0.73 0.74 0.75 0.76 0.77 0.78 0.79 8 0.80 0.81 0.82 0.83 0.84 0.85 0.86 0.87 0.88 0.89 9 0.90 0.91 0.92 0.93 0.94 0.95 0.96 0.97 0.98 0.99 10 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 11 1.10 1.11 1.12 1.13 .14 1.15 1.16 1.17 .18 1.19 12 1.20 1.21 1.22 1.23 .24 1.25 1.26 1.27 .28 1.29 13 1.30 1.31 1.32 1.33 .34 1.35 1.36 1.37 .38 1.39 14 1.40 1.41 1.42 1.43 .44 1.45 .46 1.47 .48 1.49 15 1.50 1.51 1.52 1.53 .54 1.55 .56 1.57 .58 1.59 16 1.60 1.61 1.62 1.63 .64 1.65 .66 1.67 .68 1.69 17 1.70 1.71 1.72 1.73 .74 1.75 .76 1.77 .78 1.79 18 1.80 1.81 1.82 1.83 1.84 1.85 .86 1.87 .88 1.89 19 1.90 1.91 1.92 1.93 1.94 1.95 .96 1.97 .98 1.99 20 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 21 2.10 2.11 2.12 2.13 2.14 2.15 2.16 2.17 2.18 2.19 22 2.20 2.21 2.22 2.23 2.24 2.25 2.26 2.27 2.28 2.29 23 2.30 2.31 2.32 2.33 2.34 2.35 2.36 2.37 2.38 2.39 24 2.40 2.41 2.42 2.43 2.44 2.45 2.46 2.47 2.48 2.49 25 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 26 2.60 2.61 2.62 2.63 2.64 2.65 2.66 2.67 2.68 2.69 27 2.70 2.71 2.72 2.73 2.74 2.75 2.76 2.77 2.78 2.79 28 2.80 2.81 2.82 2.83 2.84 2.85 2.86 2.87 2.88 2.89 29 2.90 2.91 2.92 2.93 2.94 2.95 2.96 2.97 2.98 2.99 30 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 31 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 32 3.20 3.21 3.22 3.23 3.24 3.25 3.26 3.27 3.28 3.29 33 3.30 3.31 3.32 3.33 3.34 3.35 3.36 3.37 3.38 3.39 34 3.40 3.41 3.42 3.43 3.44 3.45 3.46 3.47 3.48 3.49 35 3.50 3.51 3.52 3.53 3.54 3.55 3.56 3.57 3.58 3.59 O. 1. 2. 3. 4. 5. 6. ?. 8. 9. 85 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. BAROMETER: 625mm- (from 622.51 to 627.50), Centi- grade Degrees. Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. S. 0. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim Millim. 0 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 1 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 2 0.20 0.21 0.22 0.23 0.24 0.25 0.26 0.27 0.28 0.29 3 0.30 0.31 0.32 0.33 0.34 0.35 0.36 0.37 0.38 0.39 4 0.40 0.41 0.42 0.43 0.44 0.45 0.46 0.47 0.48 0.49 5 0.50 0.51 0.52 0.53 0.54 0.55 0.56 0.58 0.59 0.60 6 0.61 0.62 0.63 0.64 0.65 0.66 0.67 0.68 0.69 0.70 7 0.71 0.72 0.73 0.74 0.75 0.76 0.77 0.78 0.79 0.80 8 0.81 0.82 0.83 0.84 0.85 0.86 0.87 0.88 0.89 0.90 9 0.91 0.92 0.93 0.94 0.95 0.96 0.97 0.98 0.99 1.00 10 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 11 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 1.19 1.20 12 1.21 .22 1.23 1.24 1.25 1.26 1.27 1.28 1.29 1.30 13 1.31 .32 1.33 1.34 1.35 1.36 1.37 1.38 1.39 1.40 14 1.41 .42 1.43 1.44 1.45 1.46 1.47 1.48 1.49 1.50 15 1.51 .52 1.53 1.54 1.55 1.56 1.57 1.58 1.59 1.60 16 1.61 .62 1.63 1.64 1.65 1.66 1.67 1.68 1.69 1.70 17 1.71 .73 1.74 1.75 1.76 1.77 1.78 1.79 1.80 1.81 18 1.82 .83 1.84 1.85 1.86 1.87 1.88 1.89 1.90 1.91 19 1.92 .93 1.94 1.95 1.96 1.97 1.98 1.99 2.00 2.01 20 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 21 2.12 2.13 2.14 2.15 2.16 2.17 2.18 2.19 2.20 2.21 22 2.22 2.23 2.24 2.25 2.26 2.27 2.28 2.29 2.30 2.31 23 2.32 2.33 2.34 2.35 2.36 2.37 2.38 2.39 2.40 2.41 24 2.42 2.43 2.44 2.45 2.46 2.47 2.48 2.49 2.50 2.51 25 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.61 26 2.62 2.63 2.64 2.65 2.66 2.67 2.68 2.69 2.70 2.71 27 2.72 2.73 2.74 2.75 2.76 2.77 2.78 2.79 2.80 2.81 28 2.82 2.83 2.84 2.85 2.87 2.88 2.89 2.90 2.91 2.92 29 2.93 2.94 2.95 2.96 2.97 2.98 2.99 3.00 3.01 3.02 30 3.03 3.04 3.05 3.06 3.07 3.08 3.09 8.10 3.11 3.12 31 3.13 3.14 3.15 3.16 3.17 3.18 3.19 3.20 3.21 3.22 32 3.23 3.24 3.25 3.26 3.27 3.28 3.29 3.30 3.31 3.32 33 3.33 3.34 3.35 3.36 3.37 3.38 3.39 3.40 3.41 3.42 34 3.43 3.44 3.45 3.46 3.47 3.48 3.49 3.50 3.51 3.52 35 3.53 3.54 3.55 3.56 3.57 3.58 3.59 3.60 3.61 3.62 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 86 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. Centi- grade Degrees. BAROMETER: 630rara- (from 627.51 to 632.50). Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. ». 9. o 0 Millim. 0.00 Millim. 0.01 Millim. 0.02 Millim. 0.03 Millim. 0.04 Millim. 0.05 Millim. 0.06 Millim. 0.07 Millim. 0.08 Millim. 0.09 1 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 2 0.20 0.21 0.22 0.23 0.24 0.25 0.26 0.27 0.28 0.29 3 0.31 0.32 0.33 0.34 0.35 0.36 0.37 0.38 0.39 0.40 4 0.41 0.42 0.43 0.44 0.45 0.46 0.47 0.48 0.49 0.50 5 0.51 0.52 0.53 0.54 0.55 0.56 0.57 0.58 0.59 0.60 6 0.61 0.62 0.63 0.64 0.65 0.66 0.67 0.68 0.69 0.70 7 0.71 0.72 0.73 0.74 0.75 0.76 0.77 0.78 0.79 0.80 8 0.81 0.82 0.83 0.84 0.85 0.86 0.87 0.88 0.89 0.90 9 0.92 0.93 0.94 0.95 0.96 0.97 0.98 0.99 1.00 1.01 10 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 11 .12 1.13 .14 .15 1.16 .17 1.18 1.19 .20 1.21 12 .22 1.23 .24 .25 1.26 .27 1.28 1.29 .30 1.31 13 .32 1.33 .34 .35 1.36 .37 1.38 1.89 .40 1.41 14 .42 1.43 .44 .45 1.46 .47 1.48 1.49 .50 1.52 15 .53 1.54 .55 .56 1.57 .58 1.59 1.60 .61 1.62 16 1.63 1.64 .65 1.66 1.67 .68 1.69 1.70 1.71 1.72 17 1.73 1.74 .75 1.76 1.77 .78 1.79 1.80 1.81 1.82 18 1.83 1.84 1.85 1.86 1.87 1.88 1.89 1.90 1.91 1.92 19 1.93 1.94 1.95 1.96 1.97 1.98 1.99 2.00 2.01 2.02 20 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.13 21 2.14 2.15 2.16 2.17 2.18 2.19 2.20 2.21 2.22 2.23 22 2.24 2.25 2.26 2.27 2.28 2.29 2.30 2.31 2.32 2.33 23 2.34 2.35 2.36 2.37 2.38 2.39 2.40 2.41 2.42 2.43 24 2.44 2.45 2.46 2.47 2.48 2.49 2.50 2.51 2.52 2.53 25 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.61 2.62 2.63 26 2.64 2.65 2.66 2.67 2.68 2.69 2.70 2.71 2.73 2.74 27 2.75 2.76 2.77 2.78 2.79 2.80 2.81 2.82 2.83 2.84 28 2.85 2.86 2.87 2.88 2.89 2.90 2.91 2.92 2.93 2.94 29 2.95 2.96 2,97 2.98 2.99 3.00 3.01 3.02 3.03 3.04 30 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 3.13 3.14 31 3.15 3.16 3.17 3.18 3.19 3.20 3.21 3.22 3.23 3.24 32 3.25 3.26 3.27 3.28 3.29 3.30 3.31 3.32 3.34 3.35 33 3.36 3.37 3.38 3.39 3.40 3.41 3.42 3.43 3.44 3.45 34 3.46 3.47 3.48 3.49 3.50 3.51 3.52 3.53 3.54 3.55 35 3.56 3.57 3.58 3.59 3.60 3.61 3.62 3.63 3.64 3.65 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 87 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. BAROMETER: 635mm- (from 632.51 to 637.50), Centi- grade Degrees. Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. & 9. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 1 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 2 0.20 0.22 0.23 0.24 0.25 0.26 0.27 0.28 0.29 0.30 3 0.31 0.32 0.33 0.34 0.35 0.36 0.37 0.38 0.39 0.40 4 0.41 0.42 0.43 0.44 0.45 0.46 0.47 0.48 0.49 0.50 5 0.51 0.52 0.53 0.54 0.55 0.56 0.57 0.58 0.59 0.60 6 0.61 0.63 0.64 0.65 0.66 0.67 0.68 0.69 0.70 0.71 7 0.72 0.73 0.74 0.75 0.76 0.77 0.78 0.79 0.80 0.81 8 0.82 0.83 0.84 0.85 0.86 0.87 0.88 0.89 0.90 0.91 9 0.92 0.93 0.94 0.95 0.96 0.97 0.98 0.99 1.00 1.01 10 1.02 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 11 .13 1.14 1.15 .16 .17 .18 .19 .20 1.21 1.22 12 .23 .24 1.25 .26 .27 .28 .29 .30 1.31 1.32 13 .33 .34 1.35 .36 .37 .38 .39 .40 1.41 1.42 14 .43 .45 1.46 .47 .48 .49 .50 .51 1.52 1.53 15 .54 .55 1.56 .57 .58 .59 .60 .61 1.62 1.63 16 .64 .65 1.66 .67 .68 .69 .70 .71 1.72 1.73 17 .74 .75 1.76 .77 .78 .79 .80 .81 1.82 1.83 18 .84 .86 1.87 .88 .89 1.90 .91 1.92 1.93 1.94 19 .95 .96 1.97 .98 .99 2.00 2.01 2.02 2.03 2.04 20 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 21 2.15 2.16 2.17 2.18 2.19 2.20 2.21 2.22 2.23 2.24 22 2.25 2.27 2.28 2.29 2.30 2.31 2.32 2.33 2.34 2.35 23 2.36 2.37 2.38 2.39 2.40 2.41 2.42 2.43 2.44 2.45 24 2.46 2.47 2.48 2.49 2.50 2.51 2.52 2.53 2.54 2.55 25 2.56 2.57 2.58 2.59 2.60 2.61 2.62 2.63 2.64 2.65 26 2.66 2.67 2.69 2.70 2.71 2.72 2.73 2.74 2.75 2.76 27 2.77 2.78 2.79 2.80 2.81 2.82 2.83 2.84 2.85 2.86 28 2.87 2.88 2.89 2.90 2.91 2.92 2.93 2.94 2.95 2.96 29 2.97 2.98 2.99 3.00 3.01 3.02 3.03 3.04 3.05 3.06 30 3.07 3.08 8.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 31 3.18 3.19 3.20 3.21 3.22 3.23 3.24 3.25 3.26 3.27 32 3.28 3.29 3.30 3.31 3.32 3.33 3.34 3.35 3.36 3.37 33 3.38 3.39 3.40 3.41 3.42 3.43 3.44 3.45 3.46 3.47 34 8.48 3.49 3.51 3.52 3.53 3.54 3.55 3.56 3.57 3.58 35 3.59 3.60 3.61 3.62 3.63 3.64 3.65 3.66 3.67 3.68 0. 1. 2. 3. 4. 5. 6. 7. 8* 9. 88 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. i BAROMETER: 640mm- (from 637.51 to 642.50). Centi- grade Degrees. Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. &. 9. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 1 0.10 0.11 0.12 0.13 0.14 0.15 0.17 0.18 0.19 0.20 2 0.21 0.22 0.23 0.24 0.25 0.26 0.27 0.28 0.29 0.30 3 0.31 0.32 0.33 0.34 0.35 0.36 0.37 0.38 0.39 0.40 4 0.41 0.42 0.43 0.44 0.45 0.46 0.48 0.49 0.50 ' 0.51 5 0.52 0.53 0.54 0.55 0.56 0.57 0.58 0.59 0.60 0.61 6 0.62 0.63 0.64 0.65 0.66 0.67 0.68 0.69 0.70 0.71 7 0.72 0.73 0.74 0.75 0.76 0.77 0.78 0.80 0*81 0.82 8 0.83 0.84 0.85 0.86 0.87 0.88 0.89 0.90 0.91 0.92 9 0.93 0.94 0.95 0.96 0.97 0.98 0.99 1.00 1.01 1.02 10 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.11 1.12 1.13 11 1.14 .15 .16 .17 1.18 1.19 .20 1.21 1.22 1.23 12 1.24 .25 .26 .27 .28 1.29 .30 1.31 1.32 1.33 13 1.34 .35 .36 .37 .38 1.39 .40 1.42 1.43 1.44 14 1.45 .46 .47 .48 .49 1.50 .51 1.52 1.53 1.54 15 1.55 .56 .57 .58 .59 1.60 .61 1.62 1.63 1.64 16 1.65 .66 .67 .68 .69 1.70 .71 1.72 1.74 1.75 17 1.76 .77 .78 .79 .80 1.81 .82 1.83 1.84 1.85 18 1.86 .87 .88 .89 .90 1.91 .92 1.93 1.94 1.95 19 1.96 .97 .98 .99 2.00 2.01 2.02 2.03 2.05 2.06 20 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 2.15 2.16 21 2.17 2.18 2.19 2.20 2.21 2.22 2.23 2.24 2.25 2.26 22 2.27 2.28 2.29 2.30 2.31 2.32 2.33 2.34 2.36 2.37 23 2.3S 2.39 2.40 2.41 2.42 2.43 2.44 2.45 2.46 2.47 24 2.48 2.49 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 25 2.5S 2.59 2.60 2.61 2.62 2.63 2.64 2.65 2.66 2.68 26 2.69 2.70 2.71 2.72 2.73 2.74 2.75 2.76 2.77 2.78 27 2.79 2.80 2.81 2.82 2.83 2.84 2.85 2.86 2.87 2.88 28 2.89 2.90 2.91 2.92 2.93 2.94 2.95 2.96 2.97 2.99 29 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 30 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 31 3.20 3.21 3.22 3.23 3.24 3.25 3.26 3.27 3.28 3.30 32 3.31 3.32 3.33 3.34 3.35 3.36 3.37 3.38 3.39 3.40 33 3.41 3.42 3.43 3.44 3.45 3.46 3.47 3.48 3.49 3.50 34 3.51 3.52 3.53 3.54 3.55 3.56 3.57 3.58 3.59 3.60 35 3.62 3.63 3.64 3.65 3.66 3.67 3.68 3.69 3.70 3.71 0. 1. 2. 3. 4. 5. 6. •7. 8. 9. REDUCTION OF THE BAROMETER TO THE FREEZING POINT. BAROMETER: 645mm- (from 642.51 to 647.50). Centi- grade Degrees Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. S. 9. o Millim. Miilim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 1 0.10 0.11 0.12 0.14 0.15 0.16 0.17 0.18 0.19 0.20 2 0.21 0.22 0.23 0.24 0.25 0.26 0.27 0.28 0.29 0.30 3 0.31 0.32 0.33 0.34 0.35 0.36 0.37 0.39 0.40 0.41 4 0.42 0.43 0.44 0.45 0.46 • 0.47 0.48 0.49 0.50 0.51 5 0.52 0.53 0.54 0.55 0.56 0.57 0.58 0.59 0.60 0.61 6 0.62 0.64 0.65 0.66 0.67 0.68 0.69 0.70 0.71 0.72 7 0.73 0.74 0.75 0.76 0.77 0.78 0.79 0.80 0.81 0.82 8 0.83 0.84 0.85 0.86 0.87 0.88 0.90 0.91 0.92 0.93 9 0.94 0.95 0.96 0.97 0.98 0.99 1.00 .01 1.02 1.03 10 1.04 1.05 1.06 1.07 1.08 1.09 .10 .11 1.12 1.13 11 1.15 1.16 1.17 1.18 1.19 1.20 .21 .22 1.23 1.24 12 1.25 1.26 1.27 1.28 1.29 1.30 .31 .32 1.33 1.34 13 1.35 1.36 1.37 1.38 1.39 .41 .42 .43 1.44 1.45 14 1.46 1.47 1.48 1.49 1.50 .51 .52 .53 1.54 1.55 15 1.56 1.57 1.58 1.59 1.60 .61 1.62 .63 1.64 1.66 16 1.67 1.68 1.69 1.70 1.71 .72 1.73 1.74 1.75 1.76 17 1.77 1.78 1.79 1.80 1.81 .82 1.83 1.84 1.85 1.86 18 1.87 1.88 1.89 1.91 1.92 .93 1.94 1.95 1.96 1.97 19 1.98 1.99 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 20 2.08 2.09 2.10 2.11 2.12 2.13 2.14 2.15 2.17 2.18 21 2.19 2.20 2.21 2.22 2.23 2.24 2.25 2.26 2.27 2.28 22 2.29 2.30 2.31 2.32 2.33 2.34 2.35 2.36 2.37 2.38 23 2.39 2.40 2.42 2.43 2.44 2.45 2.46 2.47 2.48 2.49 24 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 25 2.60 2.61 2.62 2.63 2.64 2.65 2.66 2.67 2.69 2.70 26 2.71 2.72 2.73 2.74 2.75 2.76 2.77 2.78 2.79 2.80 27 1 2.5i 2.82 2.83 2.84 2.85 2.86 2.87 2.88 2.89 2.90 2? -.9* 2.93 2.94 2.95 2.96 2.97 2.98 2.99 3.00 3.01 29 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 30 3.12 3.13 3.14 3.15 3.16 3.18 3.19 3.20 3.21 3.22 31 3.23 3.24 3.25 3.26 3.27 3.28 3.29 3.30 3.31 3.32 32 8.33 3.34 3.35 3.36 3.37 3.38 3.39 3.40 3.41 3.42 33 3.44 3.45 3.46 3.47 3.48 3.49 3.50 3.51 3.52 3.53 34 3.54 3.55 3.56 3.57 3.58 3.59 3.60 3.61 3.62 3.63 35 3.64 3.65 3.66 3.67 3.68 3.69 3.70 3.71 3.72 3.73 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 90 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. 10 Centi- grade Degrees. BAROMETER : 650mm- (from 647.51 to 652.50). Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 0. o 0 Millim. 0.00 Millim. 0.01 Millim. 0.02 Millim. 0.03 Millim. 0.04 Millim. 0.05 Millim. 0.06 Millim. 0.07 Millim. 0.08 Millim. 0.09 1 on 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 2 0.21 0.22 0.23 0.24 0.25 0.26 0.27 0.28 0.29 0.30 3 0.32 0.33 0.34 0.35 0.36 0.37 0.38 0.39 0.40 0.41 4 0.42 0-43 0.44 0.45 0.46 0.47 0.48 0.49 0.50 0.51 5 0.53 0.54 0.55 0.56 0.57 0.58 0.59 0.60 0.61 0.62 6 0.63 0.64 0.65 0.66 0.67 0.68 0.69 0.70 0.71 0.72 7 0.73 0.75 0.76 0.77 0.78 0.79 0.80 0.81 0.82 0.83 8 0.84 0.85 0.86 0.87 0.88 0.89 0.90 0.91 0.92 0.93 9 0.94 0.96 0.97 0.98 0.99 1.00 .01 1.02 1.03 1.04 10 1.05 1.06 1.07 1.08 1.09 1.10 .11 1.12 1.13 1.14 11 .15 1.17 1.18 .19 1.20 1.21 .22 1.23 1.24 1.25 12 .26 1.27 1.28 .29 1.30 1.31 .32 1.33 1.34 1.35 13 .36 1.37 1.39 .40 1.41 1.42 .43 1.44 1.45 1.46 14 .47 1.48 1.49 .50 1.51 1.52 .53 1.54 1.55 1.56 15 .57 1.58 1.60 .61 1.62 1.63 .64 1.65 1.66 1.67 16 .68 1.69 1.70 1.71 1.72 1.73 1.74 1.75 1.76 1.77 17 .78 1.79 1.81 1.82 1.83 1.84 1.85 1.86 1.87 1.88 18 .89 1.90 1.91 1.92 1.93 1.94 1.95 1.96 1.97 1.98 19 .99 2.00 2.01 2.03 2.04 2.05 2.06 2.07 2.08 2.09 20 2.10 2.11 2.12 2.13 2.14 2.15 2.16 2.17 2.18 2.19 21 2.20 2.21 2.22 2.24 2.25 2.26 2.27 2.28 2.29 2.30 22 2.31 2.32 2.33 2.34 2.35 2.86 2.37 2.38 2.39 2.40 23 2.41 2.42 2.43 2.44 2.46 2.47 2.48 2.49 2.50 2.51 24 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.61 25 2.62 2.63 2.64 2.65 2.67 2.68 2.69 2.70 2.71 2.72 26 2.73 2.84 2.75 2.76 2.77 2.78 2.79 2.80 2.81 2.82 27 2.83 2.84 2.85 2.86 2.88 2.89 2.90 2.91 2.92 2.93 28 2.94 2.95 2.96 2.97 2.98 2.99 3.00 3.01 3-02 3.03 29 3.04 3.05 3.06 3.07 3.08 3.10 3-11 3.12 3.13 3.14 30 3.15 3.16 3.17 3.18 3.19 3.20 3.21 3.22 3.23 3.24 31 3.25 3.26 3.27 3.28 3.29 3.31 3.32 3.33 3.34 3.35 32 3.36 3-37 3.38 3.39 3.40 3.41 3.42 3.43 3.44 3.45 33 3.46 3.47 3.48 3.49 3.50 3.52 3.53 3.54 3.55 3.56 34 3.57 3.58 3.59 3.60 3.61 3.62 3.63 3.64 3.65 3.66 35 3.67 3.68 3.69 3.70 3.71 3.72 3.74 3.75 3.76 3.77 O. 1. 2. 3. 4. 5. 6. 7. 8. 9. c 91 11 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. Centi- grade Degrees. BAROMETER : 655mm- (from 652.51 to 657.50). Tenths of Degrees. O. 1. 2. 3. 4. 5. 6. 7. 8. 9. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.09 0.10 1 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 2 0.21 0.22 0.23 0.24 0.25 0.26 0.28 0.29 0.30 0.31 3 0.32 0.33 0.34 0.35 0.36 0.37 0.38 0.39 0.40 0.41 4 0.42 0.43 0.44 0.46 0.47 0.48 0.49 0.50 0.51 0.52 5 0.53 0.54 0.55 0.56 0.57 0.58 0.59 0.60 0.61 0.62 6 0.63 0.65 0.66 0.67 0.68 0.69 0.70 0.71 0.72 0.73 7 0.74 0.75 0.76 0.77 0.78 0.79 0.80 0.81 0.83 0.84 8 0.85 0.86 0.87 0.88 0.89 0.90 0.91 0.92 0.93 0.94 9 0.95 0.96 0.97 0.98 0.99 1.00 1.02 1.03 1.04 1.05 10 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 11 1.16 1.17 1.18 .20 1.21 1.22 .23 1.24 1.25 1.26 12 1.27 1.28 1.29 .30 1.31 1.32 .33 1.34 1.35 1.36 13 1.37 1.39 1.40 .41 1.42 1.43 .44 1.45 1.46 1.47 14 1.48 1.49 1.50 .51 1.52 1.53 .54 1.55 1.57 1.58 15 1.59 1.60 1.61 .62 1.63 1.64 .65 1.66 1,67 1.68 16 1.69 1.70 1.71 .72 1.73 1.74 1.76 1.77 1.78 1.79 17 1.80 1.81 1.82 .83 1.84 1.85 1.86 1.87 1.88 1.89 18 1.90 1.91 1.92 .94 1.95 1.96 1.97 1.98 1.99 2.00 19 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 20 2.11 2.13 2.14 2.15 2.16 2.17 2.18 2.19 2.20 2.21 24 2.22 2.23 2.24 2.25 2.26 2.27 2.28 2.29 2.31 2.32 22 2.33 2.34 2.35 2.36 2.37 2.38 2.39 2.40 2.41 2.42 23 2.43 2.44 2.45 2.46 2.47 2.48 2.50 2.51 2.52 2.53 24 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.61 2.62 2.63 25 2.64 2.65 2.66 2.68 2.69 2.70 2.71 2.72 2.73 2.74 26 2J75 2.76 2.77 2.78 2.79 2.80 2.81 2.82 2.83 2.84 27 2.85 2.87 2.88 2.89 2.90 2.91 2.92 2.93 2.94 2.95 28 2,96 2.97 2.98 2.99 3.00 3.01 3.02 3.03 3-05 3.06 29 3.07 3.08 3.09 3.10 3.11 3.12 3.13 3.14 3.15 3.16 30 3.L7 3.18 3.19 3.20 3.21 3.22 3.24 3.25 3.26 3.27 .31 3.28 3.29 3.30 3.31 3.32 3.33 3.34 3.35 3.36 3.37 32 3.38 3.39 3.40 3.42 3.43 3.44 3.45 3.46 3.47 3.48 33 3.49 3.50 3.51 3.52 3.53 3.54 3.55 3.56 3.57 3.58 34 3.59 3.61 3.62 3.63 3.64 3.65 3.66 3.67 3.68 3.69 35 3.70 3.71 3.72 3.73 3.74 3.75 3.76 3.77 3.79 3.80 0. 1. 2. 3. 4. 5. 6. T. 8. 9. (J 92 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. 12 BAROMETER : 660ram- (from 657.51 to 662.50). Centi- grade Tenths of Degrees. Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.08 0.09 0.10 1 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 2 0.21 0.22 0.23 0.25 0.26 0.27 0.28 0.29 0.30 0.31 3 0.32 0.33 0.34 0.35 0.36 0.37 0.38 0.39 0.41 0.42 4 0.43 0.44 0.45 0.46 0.47 0.48 0.49 0.50 0.51 0.52 5 0.53 0.54 0.55 0.57 0.58 0.59 0.60 0.61 0.62 0.63 6 0.64 0.65 0.66 0.67 0-68 0.69 0.70 0.71 0.72 0.74 7 0.75 0.76 0.77 0.78 0.79 0.80 0.81 0.82 0.83 0.84 8 0.85 0.86 0-87 0.88 0.90 0.91 0.92 0.93 0.94 0.95 9 0.96 0.97 0.98 0.99 1.00 1.01 1.02 1.03 1.04 1.06 10 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 11 1.17 1.18 1.19 1.20 .21 1.23 1.24 1.25 1.26 .27 12 1.28 1.29 1.30 1.31 .32 1.33 1.34 1.35 1.36 .37 13 1.39 1.40 1.41 1.42 .43 1.44 1.45 1.46 1.47 .48 14 1.49 1.50 1.51 1.52 .53 1.55 1.56 1.57 1.58 .59 15 1.60 1.61 1.62 1.63 .64 1.65 1.66 1.67 1.68 .69 16 1.70 1.72 1.73 1.74 .75 1.76 1.77 1.78 1.79 .80 17 1.81 1.82 1.83 1.84 .85 1.86 1.88 1.89 1.90 .91 18 1.92 1.93 1.94 1.95 .96 1.97 1.98 1.99 2.00 2.01 19 2.02 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 20 2.13 2.14 2.15 2.16 2.17 2.18 2.19 2.21 2.22 2.23 21 2.24 2.25 2.26 2.27 2.28 2.29 2.30 2.31 2.32 2.33 22 2.34 2.35 2.37 2.38 2.39 2.40 2.41 2.42 2.43 2.44 23 2.45 2.46 2.47 2.48 2.49 2.50 2.51 2.53 2.54 2.55 24 2.56 2.57 2.58 2.59 2.60 2.61 2.62 2.63 2.64 2.65 25 2.66 2.67 2.68 2.70 2.71 2.72 2.73 2.74 2.75 2.76 26 2.77 2.78 2.79 2.80 2.81 2.82 2.83 2.84 2.86 2.87 27 2.88 2.89 2.90 2.91 2.92 2.93 2.94 2.95 2.96 2.97 28 2.98 2.99 3.00 3.02 3.03 3.04 3.05 3.06 3.07 3.08 29 3.09 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.19 30 3.20 3.21 3.22 3.23 3.24 3.25 3.26 3.27 3.28 3.29 31 3.30 3.31 3.32 3.33 3.35 3.36 3.37 3.38 3.39 3.40 32 3.41 3.42 3.43 3.44 3.45 3.46 3.47 3.48 3.49 3.51 33 3.52 3.53 3.54 3.55 3.56 3.57 3.58 3.59 3.60 3.61 34 3.62 3.63 3.64 3.65 3.66 3.68 3.69 3.70 3.71 3.72 35 3.73 3.74 3.75 3.76 3.77 3.78 3.79 3.80 3.81 3.82 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. c 93 13 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. Centi- grade Degrees. BAROMETER : 665ram- (from 662.51 to 667.50), Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.08 0.09 0.10 1 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 2 0.22 0.23 0.24 0.25 0.26 0.27 0.28 0.29 0.30 0.31 3 0.32 0.33 0.34 0.35 0.37 0.38 0.39 0.40 0.41 0.42 4 0.43 0.44 0.45 0.46 0.47 0.48 0.49 0.51 0.52 0.53 5 0.54 0.55 0.56 0.57 0.58 0.59 0.60 0.61 0.62 0.63 6 0.64 0.66 0.67 0.68 0.69 0.70 0.71 0.72 0.73 0.74 7 0.75 0.76 0.77 0.78 0.79 0.81 0.82 0.83 0-84 0.85 8 0.86 0.87 0.88 0.89 0.90 0.91 0.92 0.93 0.95 0.96 9 0.97 0.98 0.99 1.00 1.01 .02 1.03 1.04 1.05 1.06 10 1.07 1.08 1.10 1.11 1.12 .13 1.14 1.15 1.16 1.17 11 1.18 1.19 1.20 1.21 1.22 .23 1.25 1.26 1.27 1.28 12 1.29 1.30 1.31 1.32 1.33 .34 .35 1.36 1.37 1.39 13 1.40 1.41 1.42 1.43 1.44 .45 .46 1.47 1.48 1.49 14 1.50 1.51 1.52 1.54 1.55 .56 .57 1.58 1.59 1.60 15 1.61 1.62 1.63 1.64 1.65 .66 .67 1.69 1.70 1.71 16 1.72 1.73 1.74 1.75 1.76 1.77 .78 1.79 1.80 1.81 17 1.83 1.84 1.85 1.86 1.87 1.88 .89 1.90 1.91 1.92 18 1.93 1.94 1.95 1.96 1.98 1.99 2.00 2.01 2.02 2.03 19 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.13 2.14 20 2.15 2.16 2.17 2.18 2.19 2.20 2.21 2.22 2.23 2.24 21 2.25 2.27 2.28 2.29 2.30 2.31 2.32 2.33 2.34 2.35 22 2.36 2.37 2.38 2.39 2.40 2.42 2.43 2.44 2.45 2.46 23 2.47 2.48 2.49 2.50 2.51 2.52 2.53 2.54 2.56 2.57 24 2.58 2.59 2.60 2.61 2.62 2,63 2.64 2.65 2.66 2.67 25 2.68 2.69 2-71 2.72 2.73 2.74 2.75 2.76 2.77 2.78 26 2.79 2.80 2.81 2.82 2.83 2.84 2.86 2.87 2.88 2.89 27 2.90 2.91 2.92 2.93 2.94 2.95 2.96 2.97 2.98 3.00 28 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 29 3.11 3.12 3.13 3.15 3.16 3.17 3.18 3.19 3.20 3.21 30 3.22 3.23 3.24 3.25 3.26 3.27 3.28 3.30 3.31 3.32 31 3.33 3.34 3.35 3.36 3.37 3.38 3.39 3.40 3.41 3.42 32 3.44 3.45 3.46 3.47 3.48 3.49 3.50 3.51 3.52 3.53 33 3.54 3.55 3.56 3.57 3.59 3.60 3.61 3.62 3.63 3.64 34 3.65 3.66 3.67 3.68 3.69 3.70 3.71 3.72 3.74 3.75 35 3.76 3.77 3-78 3.79 3.80 3.81 3.82 3.83 3.84 3.85 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 94 REDUCTION OF THE BAROMETER TO THE FREEZING POIKT. 14 BAROMETER • 670mm- (from 667.51 to 672.50.) Centi- grade Tenths of Degrees. Degrees. 0. 1. 2. 3. 4. 5. 6. V. 8. 9. 0 Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.03 0.04 0.05 0.07 0.08 0.09 0.10 1 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.20 0.21 2 0.22 0.23 0.24 0.25 0.26 0.27 0.28 0.29 0.30 0.31 3 0.32 0.34 0.35 0.36 0.37 0.38 0.39 0.40 0.41 0.42 4 0.43 0.44 0.45 0.47 0.48 0.49 0.50 0.51 0.52 0.53 5 0.54 0.55 0.56 0.57 0.58 0.60 0.61 0.62 0.63 0.64 6 0.65 0.66 0.67 0.68 0.69 0.70 0.71 0.73 0.74 0.75 7 0.76 0.77 0.78 0.79 0.80 0.81 0.82 0.83 0.84 0.85 8 0.87 0.88 0.89 0.90 0.91 0.92 0.93 0.94 0.95 0.96 9 0.97 0.98 1.00 .01 1.02 1.03 1.04 1.05 1.06 1.07 • 10 1.08 1.09 1.10 .11 1.13 1.14 1.15 1.16 1.17 1.18 11 1.19 1.20 1.21 .22 1.23 1.24 1.25 1.27 1.28 1.29 12 1.30 1.31 1.32 .33 1.34 1.35 1.36 1.37 1.38 1.40 13 1.41 1.42 1.43 .44 1.45 1.46 1.47 1.48 1.49 1.50 14 1.51 1.53 1.54 .55 1.56 1.57 1.58 1.59 1.60 1.61 15 1.62 1.63 1.64 .66 1.67 1.68 1.69 1.70 1.71 1.72 16 1.73 1.74 1.75 1.76 1.77 1.78 1.80 1.81 1.82 1.83 17 1.84 1.85 1.86 1.87 1.88 1.89 1.90 1.91 1.92 1.94 18 1.95 1.96 1.97 1.98 1.99 2.00 2.01 2.02 2.03 2.04 19 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 2.15 20 2.16 2.17 2.18 2.20 2.21 2.22 2.23 2.24 2.25 2.26 21 2.27 2.28 2.29 2.30 2.31 2.33 2.34 2.35 2.36 2.37 22 2.38 2.39 2.40 2.41 2.42 2.43 2.44 2-46 2.47 2.48 23 2.49 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.59 24 2.60 2.61 2.62 2.63 2.64 2.65 2.66 2.67 2.68 2.69 25 2.70 2.71 2.73 2.74 2.75 2.76 2.77 2.78 2.79 2.80 26 2.81 2.82 2.83 2.84 2.86 2.87 2.88 2.89 2.90 2.91 27 2.92 2.93 2.94 2.95 2.96 2.97 2.99 3.00 3.01 3.02 28 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.13 29 3.14 3.15 3.16 3.17 3.18 3.19 3.20 3.21 3.22 3.23 30 3.24 3.26 3.27 3.28 3.29 3.30 3.31 3.32 3.33 3.34 31 3.35 3.36 3.37 3.39 3.40 3.41 3.42 3.43 3.44 3.45 32 3.46 3.47 3.48 3.49 3.50 3.52 3.53 3.54 3.55 3.56 33 3.57 3.58 3.59 3.60 3.61 3.62 3.63 3.64 3.66 3.67 34 3.68 3.69 3.70 3.71 3.72 3.73 3.74 3.75 3.76 3 77 35 3.79 3.80 3.81 3.82 3.83 3.84 3.85 3.86 3.87 3.88 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. c 95 15 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. Centi- grade Degrees. BAROMETER : 675mm- (from 672.51 to 677.50). Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.03 0.04 0.05 0.07 0.08 0.09 0.10 1 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.19 0.20 0.21 2 0.22 0.23 0.24 0.25 0.26 0.27 0.28 0.29 0.31 0.32 3 0.33 0.34 0.35 0.36 0.37 0.38 0.39 0.40 0.41 0.42 4 0.44 0.45 0.46 0.47 0.48 0.49 0.50 0.51 0.52 0.53 5 0.54 0.56 0.57 0.58 0.59 0.60 0.61 0.62 0.63 0.64 6 0.65 0.66 0.68 0.69 0.70 0.71 0.72 0.73 0.74 0.75 7 0.76 0.77 0.78 0.80 0.81 0.82 0.83 0.84 0.85 0.86 8 0.87 0.88 0.89 0.90 0.92 0.93 0.94 0.95 0.96 0.97 9 0.98 0.99 1.00 1.01 1.02 1.03 1.05 1.06 .07 1.08 10 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.17 .18 1.19 11 1.20 1.21 1.22 1.23 1.24 1.25 .26 .27 .29 1.30 12 1.31 1.32 1.33 1.34 1.35 1.36 .37 .38 .39 .41 13 1.42 1.43 1.44 1.45 1.46 1.47 .48 .49 .50 .51 14 1.53 1.54 1.55 1.56 1.57 1.58 .59 .60 .61 .62 15 1.63 1.65 1.66 1.67 1.68 1.69 .70 .71 .72 .73 16 1.74 1.75 1.76 1.78 1.79 1.80 .81 1.82 1.83 .84 17 1.85 1.86 1.87 1.88 1.90 1.91 .92 1.9* 1.94 .95 18 1.96 1.97 1.98 1.99 2.00 2.02 2.03 2.04 2.05 2.06 19 2.07 2.08 2.09 2.10 2.11 2.12 2.14 2.15 2.16 2.17 20 2.18 2.19 2.20 2.21 2.22 2.23 2.24 2.26 2.27 2.28 21 2.29 2.30 2.31 2.32 2.33 2.34 2.35 2.36 2.38 2.39 22 2.40 2.41 2.42 2.43 2.44 2.45 2.46 2.47 2.48 2.49 23 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 24 2.61 2.63 2.64 2.65 2.66 2.67 2.68 2.69 2.70 2.71 25 2.72 2.73 2.75 2.76 2.77 2.78 2.79 2.80 2.81 2.82 26 2.83 2.84 2.85 2.87 2.88 2.89 2.90 2.91 2.92 2.93 27 2.94 2.95 2.96 2.97 2.99 3.00 3.01 3.02 3.03 3.04 28 3.05 3.06 3.07 3.08 3.09 3.10 3.12 3.13 3-14 3.15 29 3.16 3.17 3.18 3.19 3.20 3.21 3.22 3.24 3.25 3.26 30 3.27 3.28 3.29 3.30 3.31 3.32 3.33 3.34 3.36 3.37 31 3.38 3.39 3.40 3.41 3.42 3.43 3.44 3.45 3.46 3.48 32 3.49 3.50 3.51 3.52 3.53 3.54 3.55 3.56 3.57 3.58 33 3.60 3.61 3.62 3.63 3.64 3.65 3.66 3.67 3.68 3.69 34 3.70 3.72 3.73 3.74 3.75 3.76 3.77 3.78 3.79 3.80 35 3.81 3.82 3.83 3.85 3.86 3.87 3.88 3.89 3.90 3.91 O. 1. 2. 3. 4. 5. 6. 7. 8. 9. c 96 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. 16 Centi- grade Degrees. BAROMETER : 680mm (from 677.51 to 682.50). Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. •7. S. 9. o Millim. Millim. Millim. Millim. Millim Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.03 0.04 0.05 0.07 0.08 0.09 0.10 1 0.11 0.12 0.13 0.14 0.15 0.16 0.18 0.19 0.20 0.21 2 0.22 0.23 0.24 0.25 0.26 0.27 0.29 0.30 0.31 0.32 3 0.33 0.34 0.35 0.36 0.37 0.38 0.40 0.41 0.42 0.43 4 0.44 0.45 0.46 0.47 0.48 0.49 0.50 0.52 0.53 0.54 5 0.55 0.56 0.57 0.58 0.59 0.60 0.61 0.63 0.64 0.65 6 0.66 0.67 0.68 0.69 0.70 0.71 0.72 0.74 0.75 0.76 7 0.77 0.78 0.79 0.80 0.81 0.82 0.83 0.85 0.86 0.87 8 0.88 0.89 0.90 0.91 0.92 0.93 0.94 0.95 0.97 0.98 9 0.99 1.00 1.01 1.02 1.03 1.04 .05 J.06 1.08 1.09 10 1.10 1.11 1.12 1.13 1.14 1.15 .16 1.17 1.19 1.20 11 1.21 .22 1.23 1.24 .25 1.26 .27 1.28 1.30 .31 12 1.32 .33 1.34 1.35 .36 1.37 .38 1.39 1.40 .42 13 1.43 .44 1.45 1.46 .47 .48 .49 1.50 1.51 .53 14 1.54 .55 1.56 1.57 .58 .59 .60 1.61 1.62 .64 15 1.65 .66 1.67 1.68 .69 .70 .71 1.72 1.73 .75 16 1.76 .77 1.78 1.79 .80 .81 1.82 1.83 1.84 1.85 17 1.87 .88 1.89 1.90 .91 .92 1.93 1.94 1.95 1.96 18 1.98 .99 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 19 2.09 2.10 2.11 2.12 2.13 2.14 2.15 2.16 2.17 2.18 20 2.20 2.21 2.22 2.23 2.24 2.25 2.26 2.27 2.28 2.29 21 2.30 2.32 2.33 2.34 2.35 2.36 2.37 2.38 2.39 2.40 22 2.41 2.43 2.44 2.45 2.46 2.47 2.48 2.49 2.50 2.51 23 2.52 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.61 2.62 24 2.63 2.65 2.66 2.67 2.68 2.69 2.70 2.71 2.72 2.73 25 2.74 2.75 2.77 2.78 2.79 2.80 2.81 2.82 2.83 2.84 26 2.85 2.86 2.88 2.89 2.90 2.91 2.92 2.93 2.94 2.95 27 2.96 2.97 2.99 3.00 3.01 3.02 3.03 3.04 3.05 3.06 28 3.07 3.08 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 29 3.18 3.19 3.20 3.22 3.23 3.24 3.25 3.26 3.27 3.28 30 3.29 3.30 3.31 3.33 3.34 3.35 3.36 3.37 3.38 3.39 31 3.40 3.41 3.42 3.44 3.45 3.46 3.47 3.48 3.49 3.50 32 3.51 3.52 3.53 3.54 3.56 3.57 3.58 3.59 3.60 3.61 33 3.62 3.63 3.64 3.65 3.67 3.68 3.69 3.70 3.71 3.72 34 3.73 3.74 3.75 3.76 3.78 3.79 3.80 3.81 3.82 3.83 35 3.84 3.85 3.86 3.87 3.89 3.90 3.91 3.92 3.93 3.94 0. 1. 2. 3. 4. 5. 6. 7. S. 9. c 97 17 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. Centi- grade Degrees. BAROMETER : 685ram- (from 682.51 to 687.50). Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.03 0.04 0.06 0.07 0.08 0.09 0.10 1 0.11 0.12 0.13 0.14 0.15 0.17 0.18 0.19 0.20 0.21 2 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.30 0.31 0.32 3 0.33 0.34 0.35 0.36 0.38 0.39 0.40 0.41 0.42 0.43 4 0.44 0.45 0.46 0.48 0.49 0.50 0.51 0.52 0.53 0.54 5 0.55 0.56 0.57 0.59 0.60 0.61 0.62 0.63 0.64 0.65 6 0.66 0.67 0.69 0.70 0.71 0.72 0.73 0.74 0.75 0.76 7 0.77 0.78 0.80 0.81 0.82 0.83 0.84 0.85 0.86 0.87 8 0.88 0.90 0.91 0.92 0.93 0.94 0.95 0.96 0.97 0.98 9 .00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 10 .11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 1.19 1.21 ii .22 1.23 1.24 1.25 1.26 1.27 1.28 1.29 .30 1.32 12 .33 1.34 1.35 1.36 1.37 1.38 1.39 1.40 .42 1.43 13 .44 1.45 1.46 1.47 1.48 1.49 1.50 1.51 .53 1.54 14 1.55 1.56 1.57 1.58 1.59 1.60 1.61 1.63 .64 1.65 15 1.66 1.67 1.68 1.69 1.70 1.71 1.72 1.74 .75 1.76 16 1.77 1.78 1.79 1.80 1.81 1.82 1.84 1.85 1.86 1.87 17 1.88 1.89 1.90 1.91 1.92 1.93 1.95 1.96 1.97 1.98 18 1.99 2.00 2.01 2.02 2.03 2.05 2.06 2.07 2.08 2.09 19 2.10 2.11 2.12 2.13 2.14 2.16 2.17 2-18 2.19 2.20 20 2.21 2.22 2.23 2.24 2.26 2.27 2.28 2.29 2.30 2.31 21 2.32 2.33 2.34 2.35 2.37 2.38 2.39 2.40 2.41 2.42 22 2.43 2.44 2.45 2.47 2.48 2.49 2.50 2.51 2.52 2.53 23 2.54 2.55 2.56 2.58 2.59 2.60 2.61 2.62 2.63 2.64 24 2.65 2.66 2.68 2.69 2.70 2,71 2.72 2.73 2.74 2.75 25 2.76 2.78 2.79 2.80 2.81 2.82 2.83 2.84 2.85 2.86 26 2.87 2.89 2.90 2.91 2.92 2.93 2.94 2.95 2.96 2.97 27 2.99 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 28 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.20 29 3.21 3.22 3.23 3.24 3.25 3.26 3.27 3.28 3.29 3.31 30 3.32 3.33 3.34 3.35 3.36 3.37 3.38 3.39 3.41 3.42 31 3.43 3.44 3.45 3.46 3.47 3.48 3.49 3.50 3.52 3.53 32 3.54 3-55 3.56 3.57 3.58 3-59 3.60 3.62 3.63 3.64 33 3.65 3.66 3.67 3.68 3.69 3-70 3.71 3.73 3.74 3.75 34 3.76 3.77 3.78 3.79 3.80 3.81 3.83 3.84 3.85 3.86 35 3.87 8.88 3.89 3.90 3.91 3.92 3.94 3.95 3.96 3.97 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. c 98 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. 18 BAROMETER : 690mm- (from 687.51 to 692.50). Centi- grade Tenths of Degrees. Degrees. O. 1. 2. 3. 4. 5. 6. T. 8. 9. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.03 0.04 0.06 0.07 0.08 0.09 0.10 1 0.11 0.12 0.13 0.14 0.16 0.17 0.18 0.19 0.20 0.21 2 0.22 0.23 0.25 0.26 0.27 0.28 0.29 0.30 0.31 0.32 3 0.33 0.35 0.36 0.37 0.38 0.39 0.40 0.41 0.42 0.43 4 0.45 0.46 0.47 0.48 0.49 0.50 0.51 0.52 0.53 0.55 5 0.56 0.57 0.58 0.59 0.60 0.61 0.62 0.63 0.65 0.66 6 0.67 0.68 0.69 0.7P 0.71 0.72 0.74 0.75 0.76 0.77 7 0.78 0.79 0.80 0.81 0.82 0.84 0.85 0.86 0.87 0.88 8 0.89 0.90 0.91 0.92 0.94 0.95 0.96 0.97 0.98 0.99 9 1.00 1.01 1.02 1.04 1.05 1.06 1.07 1.08 1.09 .10 10 1.11 1.12 1.14 1.15 1.16 1.17 1.18 1.19 1.20 .21 11 .23 1.24 1.25 1.26 1.27 1.28 1.29 1.30 1.31 .33 12 .34 1.35 1.36 1.37 1.38 1.39 1.40 1.41 1.43 .44 13 .45 1.46 1.47 1.48 1.49 1.50 1.51 1.53 1.54 .55 14 .56 1.57 1.58 1.59 1.60 1.61 1.63 1.64 1.65 .66 15 .67 1.68 1.69 1.70 1.72 1.73 1.74 1.75 1.76 .77 16 1.78 1.79 1.80 1.82 1.83 1.84 1.85 1.86 1.87 1.88 17 1.89 1.90 1.92 1.93 1.94 1.95 1.96 1.97 1.98 1.99 18 2.00 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 19 2.12 2.13 2.14 2.15 2.16 2.17 2.18 2.19 2.21 2.22 20 2.23 2.24 2.25 2.26 2.27 2.28 2.29 2.31 2.32 2.33 21 2.34 2.35 2.36 2.37 2.38 2.39 2.41 2.42 2.43 2.44 22 2.45 2.46 2.47 2.48 2.49 2.51 2.52 2.53 2.54 2.55 23 2.56 2.57 2.58 2.59 2.61 2.62 2.63 2.64 2.65 2.66 24 2.67 2.68 2.70 2.71 2.72 2.73 2.74 2.75 2.76 2.77 25 2.78 2.80 2.81 2.82 2.83 2.84 2.85 2.86 2.87 2.88 26 2.90 2.91 2.92 2.93 2.94 2.95 2.96 2.97 2.98 3.00 27 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.10 3.11 28 3.12 3.13 3.14 3.15 3.16 3.17 3.19 3.20 3.21 3.22 29 3.23 3.24 3.25 3.26 3.27 3.29 3.30 3.31 3.32 3.33 30 3.34 3.35 3.36 3.37 3.39 3.40 3.41 3.42 3.43 3.44 31 3.45 3.46 3.47 3.49 3.50 3.51 3.52 3.53 3.54 3.55 32 3.56 3.57 3.59 3.60 3.61 3.62 3.63 3.64 3.65 3.66 33 3.68 3.69 3.70 3.71 3.72 3.73 3.74 3.75 3.76 3.78 34 3.79 3.80 3.81 3.82 3.83 3.84 3.85 3.86 3.88 3.89 35 3.90 3.91 3.92 3.93 3.94 3.95 3.96 3.98 3.99 4.00 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. c 99 19 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. BAROMETER : 695mra (from 692.51 to 697.50). Centi- grade Tenths of Degrees. Degrees. 0. 1. 2. 3. 4. 5. 6. * 8. 9. 0 Millim. Millim. Millim. Millim. Millim Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.03 0.04 0.06 0.07 0.08 0.09 0.10 1 0.11 0.12 0.13 0.15 0.16 0.17 0.18 0.19 0.20 0.21 2 0.22 0.24 0.25 0.26 0.27 0.28 0.29 0.30 0.31 0.33 3 0.34 0.35 0.36 0.37 0.38 0.39 0.40 0.42 0.43 0.44 4 0.45 0.46 0.47 0.48 0.49 0.50 0.52 0.53 0.54 0.55 5 0.56 0.57 0.58 0.59 0.61 0.62 0.63 0.64 0.65 0.66 6 0.67 0.68 0.70 0.71 0.72 0.73 0.74 0.75 0.76 0.77 7 0.79 0.80 0.81 0.82 0.83 0.84 0.85 0.86 0.87 0.89 8 0.90 0.91 0.92 0.93 0.94 0.95 0.96 0.98 0.99 1.00 9 1.01 1.02 1.03 1.04 1.05 1.07 1.08 1.09 1.10 1.11 10 1.12 1.13 1.14 1.16 1.17 1.18 1.19 1.20 1.21 1.22 11 1.23 .25 .26 1.27 1.28 1.29 1.30 1.31 1.32 1.33 12 1.35 .36 .37 1.38 1.39 1.40 1.41 1.42 1.44 1.45 13 1.46 .47 .48 1.49 1.50 1.51 1.52 1.54 1.55 1.56 14 1.57 .58 .59 1.60 1.61 1.63 1.64 1.65 1.66 1.67 15 1.68 .69 .71 1.72 1.73 1.74 1.75 1.76 1.77 1.78 16 1.79 1.81 1.82 1.83 1.84 1.85 1.86 1.87 1.88 1.90 17 1.91 1.92 1.93 1.94 1.95 1.96 1.97 1.99 2.00 2.01 18 2.02 2.03 2.04 2.05 2.06 2.08 2.09 2.10 2.11 2.12 19 2.13 2.14 2.15 2.16 2.18 2.19 2.20 2.21 2.22 2.23 20 2.24 2.25 2.27 2.28 2.29 2.30 2.31 2.32 2.33 2.34 21 2.36 2.37 2.38 2.39 2.40 2.41 2.42 2.43 2.45 2.46 22 2.47 2.48 2.49 2.50 2.51 2.52 2.53 2.55 2.56 2.57 23 2.58 2.59 2.60 2.61 2.62 2.64 2.65 2.66 2.67 2.68 24 2.69 2.70 2.71 2.73 2.74 2.75 2.76 2.77 2.78 2.79 25 2.80 2.82 2.83 2.84 2.85 2.86 2.87 2.88 2.89 2.91 26 2.92 2.93 2.94 2.95 2.96 2.97 2.98 3.00 3.01 3.02 27 3.03 3.04 3.05 3.06 3.07 3.08 3.10 3.11 3.12 3.13 28 3.14 3.15 3.16 3.17 3.19 3.20 3.21 3.22 3.23 3.24 29 3.25 3.26 3.28 3.29 3.30 3.31 3.32 3.33 3.34 3.35 30 3.37 3.38 3.39 3.40 3.41 3.42 3.43 3.44 3.45 3.47 31 3.48 3.49 3.50 3.51 3.52 3.53 3.54 3.56 3.57 3.58 32 3.59 3.60 3.61 3.62 3.63 3.65 3.66 3.67 3.68 3.69 33 3.70 3.71 3.72 3.74 3.75 3.76 3.77 3.78 3.79 3.80 34 3.81 3.83 3.84 3.85 3.86 3.87 3.88 3.89 3.90 3.91 35 3.93 3.94 3.95 3.96 3.97 3.98 3.99 4.00 4.02 4.03 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 100 REDUCTION OF THE BAROMETER TO THE FREEZING POINT, 20 BAROMETER : 700rara (from 697.51 to 702.50). Centi- grade Degrees. Tenths of Degreea. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.03 0.05 0.06 0.07 0.08 0.09 0.10 1 0.11 0.12 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.21 2 0.23 0.24 0.25 0.26 0.27 0.28 0.29 0.31 0.32 0.33 3 0.34 0.35 0.36 0.37 0.38 0.40 0.41 0.42 0.43 0.44 4 0.45 0.46 0.47 0.49 0.50 0.51 0.52 0.53 0.54 0.55 5 0.56 0.58 0.59 0.60 0.61 0.62 0.63 0.64 0.66 0.67 6 0.68 0.69 0.70 0.71 0.72 0.73 0.75 0.76 0.77 0.78 7 0.79 0.80 0.81 0.82 0.84 0.85 0.86 0.87 0.88 0.89 8 0.90 0.92 0.93 0.94 0.95 0.96 0.97 0.98 0.99 1.01 9 1.02 1.03 1.04 1.05 1.06 .07 1.08 1.10 .11 1.12 10 1.13 1.14 1.15 1.16 1.17 .19 1.20 1.21 .22 1.23 11 1.24 1.25 1.27 1.28 1.29 .30 1.31 1.32 .33 1.34 12 1.36 1.37 1.38 1.39 1.40 .41 1.42 1.43 .45 1.46 13 1.47 1.48 1.49 1.50 1.51 .53 1.54 1.55 .56 1.57 14 1.58 1.59 1.60 1.62 1.63 .64 1.65 1.66 .67 1.68 15 1.69 1.71 1.72 1.73 1.74 .75 1.76 1.77 .79 1.80 16 1.81 1.82 1.83 1.84 1.85 1.86 1.88 1.89 1.90 1.91 17 1.92 1.93 1.94 1.95 1.97 1.98 1.99 2.00 2.01 2.02 18 2.03 2.04 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.14 19 2.15 2.16 2.17 2.18 2.19 2.20 2.21 2.23 2.24 2.25 20 2.26 2.27 2.28 2.29 2.30 2.32 2.33 2.34 2.35 2.36 21 2.37 2.38 2.40 2.41 2.42 2.43 2.44 2.45 2.46 2.47 22 2.49 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.58 2.59 23 2.60 2.61 2.62 2.63 2.64 2.66 2.67 2.68 2.69 2.70 24 2.71 2.72 2.73 2.75 2.76 2.77 2.78 2.79 2.80 2.81 25 2.82 2.84 2.85 2.86 2.87 2.88 2.89 2.90 2.91 2.93 26 2.94 2.95 2.96 2.97 2.98 2.99 3.01 3.02 3.03 3.04 27 3.05 3.06 3.07 3.08 3.10 3.11 3.12 3.13 3.14 3.15 28 3.16 3.17 3.19 3.20 3.21 3.22 3.23 3.24 3.25 3.27 29 3.28 3.29 3.30 3.31 3.32 3.33 3-34 3.36 3.37 3.38 30 3.39 3.40 3.41 3.42 3.43 3.45 3.46 3.47 3.48 3.49 31 3.50 3.51 3.52 3.54 3.55 3.56 3.57 3.58 3.59 3.60 32 3.62 3.63 3.64 3.65 3.66 3.67 3.68 3.69 3.71 3.72 33 3.73 3.74 3.75 3.76 3.77 3.78 3.80 3.81 3.82 3.83 34 3.84 3.85 3.86 3.88 3.89 3.90 3.91 3.92 3.93 3.94 35 3.95 3.97 3.98 3.99 4.00 4.01 4.02 4.03 4.04 4.06 O. 1. 2. 3. 4. 5. 6. 7. 8. 9. (J 101 21 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. BAROMETER : 705mm- (from 702.51 to 707.50). Centi- grade Tenths of Degrees. Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.03 0.05 0.06 0.07 0.08 0.09 0.10 1 0.11 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.22 2 0.23 0.24 0.25 0.26 0.27 0.28 0.30 0.31 0.32 033 3 0.34 0.35 0.36 0.38 0.39 0.40 0.41 0.42 0.43 0.44 4 0.46 0.47 0.48 0.49 0.50 0.51 0.52 0.53 0.55 0.56 5 0.57 0.58 0.59 0.60 0.61 0.63 0.64 0.65 0.66 0.67 6 0.68 0.69 0.71 0.72 0.73 0.74 0.75 0.76 0.77 0.79 7 0.80 0.81 0.82 0.83 0.84 0.85 0.86 0.88 0.89 0.90 8 0.91 0.92 0.93 0.94 0.96 0.97 0.98 0.99 .00 1.01 9 1.02 1.04 1.05 .06 1.07 1.08 109 1.10 .12 .13 10 1.14 1.15 1.16 .17 1.18 1.19 1.21 1.22 .23 .24 11 1.25 .26 1.27 .29 1.80 .31 1.32 1.33 .34 .35 12 1.37 .38 1.39 .40 1.41 .42 1.43 1.45 .46 .47 13 1.48 .49 1.50 .51 1.52 .54 1.55 1.56 .57 .58 14 1.59 .60 1.62 .63 1.64 .65 1.66 1.67 .68 .70 15 1.71 .72 1.73 .74 1.75 .76 1.78 1.79 .80 .81 16 1.82 1.83 1.84 1.85 1.87 .88 1.89 1.90 1.91 1.92 17 1.93 1.95 1.96 1.97 1.98 .99 2.00 2.01 2.03 2.04 18 2.05 2.06 2.07 2.08 2.09 2.11 2.12 2.13 2.14 2.15 19 2.16 2.17 2.18 2.20 2.21 2.22 2.23 2.24 2.25 2.26 20 2.28 2.29 2.30 2.31 2.32 2.33 2.34 2.36 2.37 2.38 21 2.39 2.40 2.41 2.42 2.44 2.45 2.46 2.47 2.48 2.49 22 2.50 2.51 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.61 23 2.62 2.63 2.64 2.65 2.66 2.67 2.69 2.70 2.71 2.72 24 2.73 2.74 2.75 2.77 2.78 2.79 2.80 2.81 2.82 2.83 25 2.84 2.86 2.87 2.88 2.89 2.90 2.91 2.92 2.94 2.95 26 2.96 2.97 2.98 2.99 3.00 3.02 3.03 3.04 3.05 3.06 27 3.07 3.08 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 28 3.19 3.20 3.21 3.22 3.23 3.24 3.25 3.27 3.28 3.29 29 3.30 3.31 3.32 3.33 3.35 3.36 3.37 3.38 3.39 3.40 30 3.41 3.42 3.44 3.45 3.46 3.47 3.48 3.49 3.50 3.52 31 3.53 3.54 3.55 3.56 3.57 3.58 3.60 3.61 3.62 3.63 32 3.64 3.65 3.66 3.68 3.69 3.70 3.71 3.72 3.73 3.74 33 3.75 3.77 3.78 3.79 3.80 3.81 3.82 3.83 3.85 3.86 34 3.87 3.88 3.89 3.90 3.91 3.93 3.94 3.95 3.96 3.97 35 3.98 3.99 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. c 102 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. 22 Centi- srade Degrees. BAROMETER : 710mm- (from 707.51 to 712.50). Tenths of Degrees. o. 1. 2. 3. 4. 5. 6. 7. S. 9. 0 Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.03 0.05 0.06 0.07 0.08 0.09 0.10 1 0.11 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.21 0.22 2 0.23 0.24 0.25 0.26 0.28 0.29 0.30 0.31 0.32 0.33 3 0.34 0.36 0.37 0.38 0.39 0.40 0.41 0.42 0.44 0.45 4 0.46 0.47 0.48 0.49 0.50 0.52 0.53 0.54 0.55 0.56 5 0.57 0.58 0.60 0.61 0.62 0.63 0.64 0.65 0.66 0.68 6 0.69 0.70 0.71 0.72 0.73 0.74 0.76 0.77 0.78 0.79 7 0.80 0.81 0.83 0.84 0.85 0.86 0.87 0.88 0.89 0.91 8 0.92 0.93 0.94 0.95 0.96 0.97 0.99 .00 1.01 1.02 9 .03 1.04 1.05 1.07 1.08 1.09 1.10 .11 .12 1.13 10 .15 1.16 1.17 1.18 1.19 1.20 1.21 .23 .24 1.25 11 .26 1.27 1.28 1.29 1.31 1.32 1.33 .34 .35 1.36 12 .38 1.39 1.40 1.41 1.42 1.43 1.44 .46 .47 1.48 13 .49 1.50 1.51 1.52 1.54 1.55 1.56 .57 .58 1.59 14 .60 1.62 1.63 1.64 1.65 1.66 1.67 .68 .70 1.71 15 .72 1.73 1.74 1.75 1.76 1.78 1.79 1.80 .81 1.82 16 1.83 1.84 1.86 1.87 1.88 1.89 1.90 1.91 1.93 1.94 17 1.95 1.96 1.97 1.98 1.99 2.01 2.02 2.03 2.04 2.05 18 2.06 2.07 2.09 2,10 2.11 2.12 2.13 2.14 2.15 2.17 19 2.18 2.19 2.20 2.21 2.22 2.23 2.25 2.26 2.27 2.28 20 2.29 2.30 2.31 2.33 2.34 2.35 2.36 2.37 2.38 2.40 21 2.41 2.42 2.43 2.44 2.45 2.46 2.48 2.49 2.50 2.51 22 2.52 2.53 2.54 2.56 2.57 2.58 2.59 2.60 2.61 2.62 23 2.64 2.65 2.66 2.67 2.68 2.69 2.70 2.72 2.73 2.74 24 2.75 2.76 2.77 2.78 2.80 2.81 2.82 2.83 2.84 2.85 25 2.86 2.88 2.89 2.90 2.91 2.92 2.93 2.95 2.96 2.97 26 2.98 2.99 3.00 3.01 3.03 3.04 3.05 3.06 3.07 3.08 27 3.09 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.19 3.20 28 3.21 3.22 3.23 3.24 3.25 3.27 3.28 3.29 3.30 3.31 29 3.32 3.33 3.35 3.36 3.37 3.38 3.39 3.40 3.41 3.43 30 3.44 3.45 3.46 3.47 3.48 3.50 3.51 3.52 3.53 3.54 31 3.55 3.56 3.58 3.59 3.60 3.61 3.62 3.63 3.64 3.66 32 3.67 3.68 3.69 3.70 3.71 3.72 3.74 3.75 3.76 3.77 33 3.78 3.79 3.80 3.82 3.83 3.84 3.85 3.86 3.87 3.88 34 3.90 3.91 3.92 3.93 3.94 3.95 3.96 3.98 3.99 4.00 35 [ 4.01 4.02 4.03 4.05 4.06 4.07 4.08 4.09 4.10 4.11 i O. 1. 2. 3. 4. 5. 6. 7. 8. 9. C 103 23 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. Centi- grade Degrees. BAROMETER: 715mra (from 712.51 to 717.50). Tenths of Degrees. O. 1. 2. 3. 4. 5. 6. ?. 8. 9. o 0 Millim. 0.00 Millim. 0.01 Millim. 0.02 Millim. 0.04 Millim 0.05 Millim. 0.06 Millim. 0.07 Millim. 0.08 Millim. 0.09 Millim. 0.10 1 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.20 0.21 0.22 2 0.23 0.24 0.25 0.27 0.28 0.29 0.30 0.31 0.32 0.33 3 0.35 0.36 0.37 0.38 0.39 0.40 0.42 0.43 0.44 0.45 4 0.46 0.47 0.48 0.50 0.51 0.52 0.53 0.54 0.55 0.57 5 0.58 0.59 0.60 0.61 0.62 0.63 0.65 0.66 0.67 0.68 6 0.69 0.70 0.72 0.73 0.74 0.75 0.76 0.77 0.78 0.80 7 0.81 0.82 0.83 0.84 0.85 0.87 0.88 0.89 0.90 0.91 8 0.92 0.93 0.95 0.96 0.97 0.98 0.99 1.00 1.02 1.03 9 1.04 1.05 1.06 .07 .08 1.10 1.11 1.12 1.13 1.14 10 1.15 1.17 1.18 .19 .20 1.21 1.22 1.23 1.25 1.26 11 1.27 1.28 1.29 .30 .32 1.33 1.34 1.35 1.36 1.37 12 1.38 1.40 1.41 .42 .43 1.44 1.45 1.47 1.48 1.49 13 1.50 1.51 1.52 .53 .55 1.56 1.57 1.58 1.59 1.60 14 1.62 1.63 1.64 .65 .66 1.67 1.68 1.70 1.71 1.72 15 1.73 1.74 1.75 .77 .78 1.79 1.80 1.81 1.82 1.83 16 1.85 1.86 1.87 1.88 1.89 1.90 1.92 1.93 1.94 1.95 17 1.96 1.97 1.98 2.00 2.01 2.02 2.03 2.04 2.05 2.07 18 2.08 2.09 2.10 2.11 2.12 2.13 2.15 2.16 2.17 2.18 19 2.19 2.20 2.22 2.23 2.24 2.25 2.26 2.27 2.28 2.30 20 2.31 2.32 2.33 2.34 2.35 2.37 2.38 2.39 2.40 2.41 21 2.42 2.43 2.45 2.46 2.47 2.48 2.49 2.50 2.52 2.53 22 2.54 2.55 2.56 2.57 2.58 2.60 2.61 2.62 2.63 2.64 23 2.65 2.67 2.68 2.69 2.70 2.71 2.72 2.74 2.75 2.76 24 2.77 2.78 2.79 2.80 2.82 2.83 2.84 2.85 2.86 2.87 25 2.89 2.90 2.91 2.92 2.93 2.94 2.95 2.97 2.98 2.99 26 3.00 3.01 3.02 3.04 3.05 3.06 3.07 3.08 3.09 3.10 27 3.12 3.13 3.14 3.15 3.16 3.17 3.19 3.20 3.21 3.22 28 3.23 3.24 3.25 3.27 3.28 3.29 3.30 3.31 3.32 3.34 29 3.35 3.36 3.37 3.38 3.39 3.40 3.42 3.43 3.44 3.45 30 3.46 3.47 3.49 3.50 3.51 3.52 3.53 3.54 3.55 3.57 31 3.58 3.59 3.60 3.61 3.62 3.64 3.65 3.66 3.67 3.68 32 3.69 3.70 3.72 3.73 3.74 3.75 3.76 3.77 3.79 3.80 33 3.81 3.82 3.83 3.84 3.85 3.87 3.88 3.89 3.90 3.91 34 3.92 3.94 3.95 3.96 3.97 3.98 3.99 4.00 4.02 4.03 35 4.04 4.05 4.06 4.07 4.09 4.10 5. 4.11 4.12 4.13 4.14 0. 1. 2. 3. 4. 6. 7. 8. 9. 104 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. BAROMETER : 720ram (from 717.51 to 722.50). Centi- grade Degrees. Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. o Millim. Millim. Millim. Miltim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.03 0.05 0.06 0.07 0.08 0.09 0.10 1 0.12 0.13 0.14 0.15 0.16 0.17 0.19 0.20 0.21 0.22 2 0.23 0.24 0.26 0.27 0.28 0.29 0.30 0.31 0.33 0.34 3 0.35 0.36 0.37 0.38 0.40 0.41 0.42 0.43 0.44 0.45 4 0.46 0.48 0.49 0.50 0.51 0.52 0.53 0.55 0.56 0.57 5 0.58 0.59 0.60 0.62 0.63 0.64 0.65 0.66 0.67 0.69 6 0.70 0.71 0-72 0.73 0.74 0.76 0.77 0.78 0.79 0.80 7 0.81 0.83 0.84 0.85 0.86 0.87 0.88 0.89 0-91 0.92 8 0.93 0.94 0.95 0.96 0.98 0.99 .00 .01 1.02 1.03 9 1.05 1.06 1.07 1.08 1.09 .10 .12 .13 1.14 1.15 10 1.16 1.17 1.19 1.20 1.21 .22 .23 .24 1.26 1.27 li 1.28 .29 1.30 .31 1.32 .34 .35 .36 1.37 1.38 12 1.39 .41 1.42 .43 1.44 .45 .46 .48 1.49 1.50 13 1.51 .52 1.53 .55 1.56 .57 .58 .59 1.60 1.62 14 1.63 .64 1.65 .66 1.67 .69 .70 .71 1.72 1.73 15 1.74 .75 1.77 .78 1.79 1.80 .81 .82 1.84 1.85 16 1.86 .87 1.88 1.89 1.91 1.92 1.93 1.94 1.95 1.96 17 1.98 .99 2.00 2.01 2.02 2.03 2.05 2.06 2.07 2.08 18 2.09 2.10 2.11 2.13 2.14 2.15 2.16 2.17 2.18 2.20 19 2.21 2.22 2.23 2.24 2.25 2.27 2.28 2.29 2.30 2.31 20 2.32 2.34 2.35 2.36 2.37 2.38 2.39 2.41 2.42 2.43 21 2.44 2.45 2.46 2.48 2.49 2.50 2.51 2.52 2.53 2.54 22 2.56 2.57 2.58 2.59 2.60 2.61 2.63 2.64 2.65 2.66 23 2.67 2.68 2.70 2.71 2.72 2.73 2-74 2.75 2.77 2.78 24 2.79 2.80 2.81 2.82 2.84 2.85 2.86 2.87 2.88 2.89 25 2.91 2.92 2.93 2.94 2.95 2.96 2.97 2.99 3.00 3.01 26 3.02 3.03 3.04 3.06 3.07 3.08 3.09 3.10 3.11 3.13 27 3.14 3-15 3.16 3.17 3.18 3.20 3.21 3.22 3.23 3.24 28 3.25 3.27 3.28 3.29 3.30 3.31 3-32 3.34 3.35 3.36 29 3.37 3.38 3.39 3.40 3.42 3.43 3-44 3.45 3.46 3.47 30 3.49 3.50 3.51 3.52 3.53 3.54 3.56 3.57 3.58 3.59 31 3.60 3.61 3.63 3.64 3-65 3.66 3-67 3.68 3.70 3.71 32 3.72 3.73 3.74 3.75 3.77 3.78 3.79 3.80 3.81 3.82 33 3.83 3.85 3.86 3.87 3.88 3.89 3.90 3.92 3.93 3.94 34 3.95 3.96 3.97 3.99 4-00 4.01 4.02 4.03 4.04 4.06 35 4.07 4.08 4.09 4.10 4.11 4.13 4.14 4.15 4.16 4.17 0. 1. 2. 3. 4. 5. 6. •7. 8. 9. 105 25 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. BAROMETER : 725ram- (from 722.51 to 727.50). Centi- grade Tenths of Degrees. Degrees. 0. 1. 2. 3. 4. 5. 6. •7. 8. 9. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.04 0.05 0.06 0.07 0.08 0.09 0.11 1 0.12 0.13 0.14 0.15 0.16 0.18 0.19 0.20 0.21 0.22 2 0.23 0.25 0.26 0.27 0.28 0.29 0.30 0.32 0.33 0.34 3 0.35 0.36 0.37 0.39 0.40 0.41 0.42 0.43 0.44 0.46 4 0.47 0.48 0.49 0.50 0.51 0.53 0.54 0.55 0.56 0.57 5 0.59 0.60 0.61 0.62 0.63 0.64 0.66 0.67 0.68 0.69 6 0.70 0.71 0.73 0.74 0.75 0.76 0.77 0.78 0.80 0.81 7 0.82 0.83 0.84 0.85 0.87 0.88 0.89 0.90 0.91 0.92 8 0.94 0.95 0.96 0.97 0.98 0.99 1.01 .02 1.03 .04 9 1.05 1.06 1.08 .09 .10 .11 1.12 .14 1.15 .16 10 1.17 1.18 1.19 .21 .22 .23 1.24 .25 1.26 .28 11 1.29 1.30 .31 .32 .33 .35 1.36 .37 1.38 .39 12 1.40 1.42 .43 .44 .45 .46 1.47 .49 1.50 .51 13 1.52 1.53 .54 .56 .57 .58 1.59 .60 1.61 .63 14 1.64 1.65 .66 .67 .69 .70 1.71 1.72 1.73 .74 15 1.76 1.77 .78 .79 .80 .81 1.83 1.84 1.85 .86 16 1.87 1.88 1.90 1.91 1.92 1.93 1.94 1.95 1.97 1.98 17 1.99 2.00 2.01 2.02 2.04 2.05 2.06 2.07 2.08 2.09 18 2.11 2.12 2.13 2.14 2.15 2.16 2.18 2.19 2.20 2.21 19 2.22 2.23 2.25 2.26 2.27 2.28 2.29 2.31 2.32 2.33 20 2.34 2.35 2.36 2.38 2.39 2.40 2.41 2.42 2.43 2.45 21 2.46 2.47 2.48 2.49 2.50 2.52 2.53 2.54 2.55 2.56 22 2.57 2.59 2.60 2.61 2.62 2.63 2.64 2.66 2.67 2.68 23 2.69 2.70 2.71 2.73 2.74 2.75 2.76 2.77 2.78 2.80 24 2.81 2.82 2.83 2.84 2.86 2.87 2.88 2.89 2.90 2.91 25 2.93 2.94 2.95 2.96 2.97 2.98 3.00 3.01 3.02 3.03 26 3.04 3.05 3.07 3.08 3.09 3.10 3.11 3.12 3.14 3.15 27 3-16 3.17 3.18 3.19 3.21 3.22 3.23 3.24 3.25 3.26 28 3.28 3.29 3.30 3.31 3.32 3.33 3.35 3.36 3.37 3.38 29 3.39 3.41 3.42 3.43 3.44 3.45 3.46 3.48 3.49 3.50 30 3.51 3.52 3.53 3.55 3.56 3.57 3.58 3.59 3.60 3.62 31 3.63 3.64 3.65 3.66 3.67 3.69 3.70 3.71 3.72 3.73 32 3.74 3.76 3.77 3.78 3.79 3.80 3.81 3.83 3.84 3.85 33 3.86 3.87 3.88 3.90 3.91 3.92 3.93 3.94 3.96 3.97 34 3.98 3.99 4.00 4.01 4.03 4.04 4.05 4.06 4.07 4.08 35 4.10 4.11 4.12 4.13 4.14 4.15 4.17 4.18 4.19 4.20 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 106 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. 26 Centi- grade Degrees. BAROMETER : 730rara (from 727.51 to 732.50). Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.04 0.05 0.06 0.07 0.08 0.09 0.11 1 0.12 0.13 0.14 0.15 0.16 0.18 0.19 0.20 0.21 0.22 2 0.24 0.25 0.26 0.27 0.28 0.29 0.31 0.32 0.33 0.34 3 0.35 0.37 0.38 0.39 0.40 0.41 0.42 0.44 0.45 0.46 4 0.47 0.48 0.49 0.51 0.52 0.53 0.54 0.55 0.57 0.58 5 0.59 0.60 0.61 0.62 0.64 0.65 0.66 0.67 0.68 0.70 6 0.71 0.72 0.73 0.74 0.75 0.77 0.78 0.79 0.80 0.81 7 0.82 0.84 0.85 0.86 0.87 0.88 0.90 0.91 0.92 0.93 8 0.94 0.95 0.97 0.98 0.99 .00 1.01 1.03 1.04 1.05 9 .06 .07 .08 1.10 1.11 .12 1.13 1.14 1.15 .17 10 .18 .19 .20 1.21 1.23 .24 1.25 1-26 1.27 .28 11 .30 .31 .32 1.33 1.34 .35 1.37 1.38 1.39 .40 12 .41 .43 .44 1.45 1.46 .47 1.48 1.50 1.51 .52 13 .53 .54 .56 1.57 1.58 .59 1.60 1.61 1.63 .64 14 .65 .66 .67 1.68 1.70 .71 1.72 1.73 1.74 .76 15 .77 .78 .79 1.80 1.81 1.83 1.84 1.85 1.86 .87 16 1.89 1.90 1.91 1.92 1.93 1.94 1.96 1.97 1.98 1.99 17 2.00 2.01 2.03 2.04 2.05 2.06 2.07 2.09 2.10 2.11 18 2.12 2.13 2.14 2.16 2.17 2.18 2.19 2.20 2.22 2.23 19 2.24 2.25 2.26 2.27 2.29 2.30 2.31 2.32 2.33 2.34 20 2.36 2.37 2.38 2.39 2.40 2.42 2.43 2.44 2.45 2.46 21 2.47 2.49 2.50 2.51 2.52 2.53 2.54 2.56 2.57 2.58 22 2.59 2.60 2.62 2.63 2.64 2.65 2.66 2.67 2.69 2.70 23 2.71 2.72 2.73 2.75 2.76 2.77 2.78 2.79 2.80 2.82 24 2.83 2.84 2.85 2.86 2.87 2.89 2.90 2.91 2.92 2.93 25 2.95 2.96 2.97 2.98 2.99 3.01 3.02 3.03 3.04 3.05 26 3.06 3.08 3.09 3.10 3.11 3.12 3.13 3.15 3.16 3.17 27 3.18 3.19 3.20 3.22 3.23 3.24 3.25 3.26 3.28 3.29 28 3.30 3.31 3.32 3.33 3.35 3.36 3.37 3.38 3.39 3.41 29 3.42 3.43 3.44 3.45 3.46 3.48 3.49 3.50 3.51 3.52 30 3.53 3.55 3.56 3.57 3.58 3.59 3.61 3.62 3.63 3.64 31 3.65 3.66 3.68 3.69 '3.70 3.71 372 3.73 3-75 3.76 32 3.77 3.78 3.79 3.81 3.82 3.83 3.84 3.85 3.86 3.88 33 3.89 3.90 3.91 3.92 3.94 3.95 3.96 3.97 3.98 3.99 34 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.09 4.10 4.11 35 4.12 4.14 4.15 4.16 4.17 4.18 4.19 4.21 4.22 4.23 O. 1. 2. 3. 4. 5. 6. T. 8. 9. C 107 27 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. BAROMETER : 735mm- (from 732.51 to 737.50). Centi- grade Tenths of Degrees. Degrees. o. 1. 2. 3. 4. 5. 6. •7. 8. 9. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.04 0.05 0.06 0.07 0.08 0.09 0.11 1 0.12 0.13 0.14 0.15 0.17 0.18 0.19 0.20 0.21 0.23 2 0.24 0.25 0.26 0.27 0.28 0.30 0.31 0.32 0.33 0.34 3 0.36 0.37 0.38 0.39 0.40 0.42 0.43 0.44 0.45 0.46 4 0.47 0.49 0.50 0.51 0.52 0.53 0.55 0.56 0.57 0.58 5 0.59 0.61 0.62 0.63 0.64 0.65 0.66 0.68 0.69 0.70 6 0.71 0.72 0.74 0.75 0.76 0.77 0.78 0.79 0.81 0.82 7 0.83 0.84 0.85 0.87 0.88 0.89 0.90 0-91 0.93 0.94 8 0.95 0.96 0.97 0.98 1.00 1.01 .02 .03 .04 1.06 9 1.07 1.08 1.09 .10 1.12 1.13 .14 .15 .16 1.17 10 1.19 1.20 1.21 .22 1.23 1.25 .26 .27 .28 1.29 11 1.30 .32 1.33 .34 1.35 1.35 .37 .39 .40 1.41 12 1.42 .44 1.45 .46 1.47 1.48 .49 .51 .52 1.53 13 1.54 .55 1.57 .58 1.59 1.60 .61 .63 .64 1.65 14 1.66 .67 1.69 .70 1.71 1.72 .73 .74 .76 1.77 15 1.78 .79 1.80 .82 1.83 1.84 .85 .86 ' .87 1.89 16 1.90 1.91 1.92 1.93 1.95 1.96 1.97 1.98 1.99 2.00 17 2.02 2.03 2.04 2.05 2.06 2.08 2.09 2.10 2.11 2.12 18 2.14 2.15 2.16 2.17 2.18 2.19 2.21 2.22 2.23 2.24 19 2.25 2.27 2.28 2.29 2.30 2.31 2.33 2.34 2.35 2.36 20 2.37 2.38 2.40 2.41 2.42 2.43 2.44 2.46 2.47 2.48 21 2.49 2.50 2.51 2.53 2.54 2.55 2.56 2-57 2.59 2.60 22 2.61 2.62 2.63 2.65 2.66 2.67 2.68 2.69 2.70 2.72 23 2.73 2.74 2.75 2.76 2.78 2.79 2.80 2.81 2.82 2.84 24 2.85 2.86 2.87 2.88 2.89 2.91 2.92 2.93 2.94 2.95 25 2.97 2.98 2.99 3.00 3.01 3.03 3.04 3.05 3.06 3.07 26 3.08 3.10 3.11 3.12 3.13 3.14 3.16 3-17 3.18 3.19 27 3.20 3.21 3.23 3.24 3.25 3.26 3.27 3.29 3.30 3.31 28 3.32 3.33 3.35 3.36 3.37 3.38 3.39 3.40 3.42 3.43 29 3.44 3.45 3.46 3.48 3.49 3.50 3.51 3-52 3.54 3.55 30 3.56 3.57 3.58 3.59 3.61 3.62 3.63 3.64 3.65 3.67 31 3.68 3.69 3.70 3.71 3.72 ' 3.74 3.75 3-76 3.77 3.78 32 3.80 3.81 3.82 3.83 3.84 3.86 3.87 3.88 3.89 3.90 33 3.91 3.93 3.94 3.95 3.96 3.97 3.99 4.00 4.01 4.02 34 4.03 3.05 4.06 4.07 4.08 4.09 4.10 4.12 4.13 4.14 35 4.15 4.16 4.18 4.19 4.20 4.21 4.22 4.24 4.25 4.26 O. 1. 2. 3. 4. 5. 6. T. 8. 9. c 108 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. BAROMETER : 740rara- (from 737.51 to 742.50). Centi. grade Tenths of Degrees. Degrees. o. L 2. 3. 4. 5. 6. 7. 8. 9. 0 Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. ° 0.00 0.01 0.02 0.04 0.05 0.06 0.07 0.08 0.09 0.11 1 0.12 0.13 0.14 0.16 0.17 0.18 0.19 0.20 0.21 0.23 2 0.24 0.25 0.26 0.27 0.29 0.30 0.31 0.32 0.33 0.35 3 0.36 0.37 0.38 0.39 0.41 0.42 0.43 0.44 0.45 0.47 4 0.48 0.49 0.50 0.51 0,53 0.54 0.55 0.56 0.57 0.59 5 0.60 0.61 0.62 0.63 0.64 0.66 0.67 0.68 0.69 0.70 6 0.72 0.73 0.74 0.75 0.76 0.78 0.79 0.80 0.81 0.82 7 0.84 0.85 0.86 0.87 0.88 0.90 0.91 0.92 0.93 0.94 8 0.96 0.97 0.98 0.99 1.00 1.02 1.03 1.04 1.05 1.06 9 1.07 .09 .10 1.11 1.12 1.13 1.15 1.16 1.17 .18 10 1.19 .21 ,22 1.23 1.24 1.25 1.27 1.28 1.29 .30 11 1.31 .33 .34 1.35 1.36 1.37 .39 1.40 .41 .42 12 1.43 .45 .46 1.47 1.48 1.49 .50 1.52 .53 .54 13 1.55 .56 .58 1.59 1.60 1.61 .62 1.64 .65 .66 14 1.67 .68 .70 1.71 1.72 1.73 .74 1.76 .77 .78 15 1.79 .80 .82 1.83 1.84 1.85 .86 1.88 .89 1.90 16 1.91 1.92 1.93 1.95 1.96 1.97 1.98 1.99 2.01 2.02 17 2.03 2.04 2.05 2.07 2.08 2.09 2.10 2.11 2.13 2.14 18 2.15 2.16 2.17 2.19 2.20 2.21 2.22 2.23 2.25 2.26 19 2.27 2.28 2.29 2.31 2.32 2.33 2.34 2.35 2.36 2.38 20 2.39 2.40 2.41 2.42 2.44 2.45 2.46 2.47 2.48 2.50 21 2.51 2.52 2.53 2.54 2.56 2.57 2.58 2.59 2.60 2.62 22 2.63 2.64 2.65 2.66 2.68 2.69 2.70 2.71 2.72 2.74 23 2.75 2.76 2.77 2.78 2.79 2.81 2.82 2.83 2.84 2.85 24 2.87 2.88 2.89 2.90 2.91 2.93 2.94 2.95 2.96 2.97 25 2.99 3.00 3.01 3.02 3.03 3.05 3.06 3.07 3.08 3.09 26 3.11 3.12 3.13 3.14 3.15 3.17 3.18 3.19 3.20 3.21 27 3.22 3.24 3.25 3.26 3.27 3.28 3.30 3.31 3.32 3.33 28 3.34 3.36 3.37 3.38 3.39 3.40 3.42 3.43 3.44 3.45 29 3.46 3.48 3.49 3.50 3.51 3.52 3.54 3.55 3.56 3.57 30 3.58 3.60 3.61 3.62 3.63 3.64 3.65 3.67 3.68 3.69 31 3.70 3.71 3.73 3.74 3.75 3.76 3.77 3.79 3.80 3.81 32 3.82 3.83 3.85 3.86 3.87 3.88 3.89 3.91 3.92 3.93 33 3.94 3.95 3.97 3.98 3.99 4.00 4.01 4.02 4.04 4.05 34 4.06 4.07 4.08 4.10 4.11 4.12 4.13 4.14 4.16 4.17 JL 4.18 4.19 4.20 4.22 4.23 4.24 4.25 4.26 4.28 4.29 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. c 109 29 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. Centi- grade Degrees. BAROMETER : 745mm- (from 742.51 to 747.50). Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. o 0 Millim. 0.00 Millim. 0.01 Millim. 0.02 Millim. 0.04 Millim. 0.05 Millim. 0.06 Millim. 0.07 Millim. 0.08 Millim. 0.10 Millim. 0.11 1 0.12 0.13 0.14 0.16 0.17 0.18 0.19 0.20 0.22 0.23 2 0.24 0.25 0.26 0.28 0.29 0.30 0.31 0.32 0.34 0.35 3 0.36 0.37 0.38 0.40 0.41 0.42 0.43 0.44 0.46 0.47 4 0.48 0.49 0.51 0.52 0.53 0.54 0.55 0.57 0.58 0.59 5 0.60 0.61 0.63 0.64 0.65 0.66 0.67 0.69 0.70 0.71 6 0.72 0.73 0.75 0.76 0.77 0.78 0.79 0.81 0.82 0.83 7 0.84 0.85 0.87 0.88 0.89 0.90 0.91 0.93 0.94 0.95 8 0.96 0.97 0.99 1.00 1.01 1.02 1.03 .05 1.06 .07 9 1.08 1.09 .11 1.12 1.13 1.14 1.15 .17 1.18 .19 10 1.20 1.21 .23 1.24 1.25 1.26 1.27 .29 1.30 .31 11 1.32 1.33 .35 1.36 .37 .38 1.39 .41 1.42 .43 12 1.44 1.45 .47 1.48 .49 .50 1.52 .53 1.54 .55 13 1.56 1.58 .59 1.60 .61 .62 1.64 .65 1.66 .67 14 1.68 1.70 .71 1.72 .73 .74 1.76 .77 1.78 .79 15 1.80 1.82 .83 1.84 .85 .86 1.88 1.89 1.90 .91 16 1.92 1.94 1.95 1.96 1.97 1.98 2.00 2.01 2.02 2.03 17 2.04 2.06 2.07 2.08 2.09 2.10 2.12 2.13 2.14 2.15 18 2.16 2.18 2.19 2.20 2.21 2.22 2.24 2.25 2.26 2.27 19 2.28 2.30 2.31 2.32 2.33 2.34 2.36 2.37 2.38 2.39 20 2.40 2.42 2.43 2.44 2.45 2.46 2.48 2.49 2.50 2.51 21 2.53 2.54 2.55 2.56 2.57 2.59 2.60 2.61 2.62 2.63 22 2.65 2.66 2.67 2.68 2.69 2.71 2.72 2.73 2.74 2.75 23 2.77 2.78 2.79 2.80 2.81 2.83 2.84 2.85 2.86 2.87 24 2.89 2.90 2.91 2.92 2.93 2.95 2.96 2.97 2.98 2.99 25 3.01 3.02 3.03 3.04 3.05 3.07 3.08 3.09 3.10 3.11 26 3.13 3.14 3.15 3.16 3.17 3.19 3.20 3.21 3.22 3.23 27 3.25 3.26 3.27 3.28 3.29 3.31 3.32 3.33 3.34 3.35 28 3.37 3.38 3.39 3.40 3.41 3.43 3.44 3.45 3.46 3.48 29 3.49 3.50 3.51 3.52 3.54 3.55 3.56 3.57 3.58 3.60 30 3.61 3.62 3.63 3.64 3.66 3.67 3.68 3.69 3.70 3.72 31 3.73 3.74 3.75 3.76 3.78 3.79 3.80 3.81 3.82 3.84 32 3.85 3.86 3.87 3.88 3.90 3.91 3.92 3.93 3.94 3.96 33 3.97 3.98 3.99 4.00 4.02 4.03 4.04 4.05 4.06 4.08 34 4.09 4.10 4.11 4.12 4.14 4.15 4.16 4.17 4.18 4.20 35 4.21 4.22 4.23 4.24 4.26 4.27 4.28 4.29 4.30 4.32 0. 1. 2. 3. 4. 5. 6. *• 8. 9. c 110 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. 30 BAROMETER : 750ram- (from 747.51 to 752.50). Centi- grade Tenths of Degrees. Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.04 0.05 0.06 0.07 0.08 0.10 0.11 1 0.12 0.13 0.15 0.16 0.17 0.18 0.19 0.21 0.22 0.23 2 0.24 0.25 0.27 0.28 0.29 0.30 0.31 0.33 0.34 0.35 3 0.36 0.38 0.39 0.40 0.41 0.42 0.44 0.45 0.46 0.47 4 0.48 0.50 0.51 0.52 0.53 0.55 0.56 0.57 0.58 0.59 5 0.61 0.62 0.63 0.64 0.65 0.67 0.68 0.69 0.70 0.71 6 0.73 0.74 0.75 0.76 0.77 0.79 0.80 0.81 0.82 0.84 7 0.85 0.86 0.87 0.88 0.90 0.91 0.92 0.93 0.94 0.96 8 0.97 0.98 0.99 1.00 1.02 1.03 1.04 1.05 1.07 1.08 9 1.09 .10 1.11 1.13 1.14 1.15 1.16 1.17 1.19 1.20 10 1.21 .22 1,23 1.25 1.26 1.27 1.28 1.30 1.31 1.32 11 1.33 .34 1.36 1.37 .38 1.39 .40 1.42 1.43 1.44 12 1.45 .46 1.48 1.49 .50 1.51 .53 1.54 1.55 1.56 13 1.57 .59 1.60 1.61 .62 1.63 .65 1.66 1.67 1.68 14 1.69 .71 1.72 1.73 .74 1.76 .77 1.78 1.79 1.80 15 1.82 1.83 1.84 1.85 .86 1.88 .89 1.90 1.91 1.92 16 1.94 1.95 1.96 1.97 1.99 2.00 2.01 2.02 2.03 2.05 17 2.06 2.07 2.08 2.09 2.11 2.12 2.13 2.14 2.15 2.17 18 2.18 2.19 2.20 2.21 2.23 2.24 2.25 2.26 2.28 2.29 19 2.30 2.31 2.32 2.34 2.35 2.36 2.37 2.38 2.40 2.41 20 2.42 2.43 2.45 2.46 2.47 2.48 2.49 2.51 2.52 2.53 21 2.54 2.55 2.57 2.58 2.59 2.60 2.61 2.63 2.64 2.65 22 2.66 2.68 2.69 2.70 2.71 2.72 2.73 2.75 2.76 2.77 23 2.78 2.80 2.81 2.82 2.83 2.84 2.86 2.87 2.88 2.89 24 2.91 2.92 2.93 2.94 2.95 2.97 2.98 2.99 3.00 3.01 25 3.03 3.04 3.05 3.06 3.07 3.09 3.10 3.11 3.12 3.14 26 3.15 3.16 3.17 3.18 3.20 3.21 3.22 3.23 3.24 3.26 27 3.27 3.28 3.29 3.30 3.32 3.33 3.34 3.35 3.37 3.38 28 3.39 3.40 3.41 3.43 3.44 3.45 3.46 3.47 3.49 3.50 29 3.51 3.52 3.54 3.55 3.56 3.57 3.58 3.60 3.61 3.62 30 3.63 3.64 3.66 3.67 3.68 3.69 3.70 3.72 3.73 3.74 31 3.75 3.76 3.78 3.79 3.80 3.81 3.83 3.84 3.85 3.86 32 3.87 3.89 3.90 3.91 3.92 3.93 3.95 3.96 3.97 3.98 33 3.99 4.01 4.02 4.03 4.04 4.06 4.07 4.08 4.09 4.10 34 4.12 4.13 4.14 4.15 4.16 4.18 4.19 4.20 4.21 4.22 35 4.24 4.25 4.26 4.27 4.29 4.30 4.31 4.32 4.33 4.35 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. C 111 31 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. Centi- grade Degrees. BAROMETER : 755mra- (from 752.51 to 757.50). Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.04 0.05 0.06 0.07 0.09 0.10 0.11 1 0.12 0.13 0.15 0.16 0.17 0.18 0.19 0.21 0.22 0.23 2 0.24 0.26 0.27 0.28 0.29 0.30 0.32 0.33 0.34 0.35 3 0.37 0.38 0.39 0.40 0.41 0.43 0.44 0.45 0.46 0.48 4 0.49 0.50 0.51 0.52 0.54 0.55 0.56 0.57 0.58 0.60 5 0.61 0.62 0.63 0.65 0.66 0.67 0.68 0.69 0.71 0.72 6 0.73 0.74 0.76 0.77 0.78 0.79 0.80 0.82 0.83 0.84 7 0.85 0.87 0.88 0.89 0.90 0.91 0.93 0.94 0.95 0.96 8 0.97 0.99 1.00 1.01 1.02 1.04 1.05 .06 .07 1.08 9 .10 1.11 1.12 1.13 1.15 1.16 1.17 .18 .19 1.21 10 .22 1.23 1.24 1.26 1.27 1.28 1.29 .30 .32 1.33 11 .34 1.35 1.36 1.38 1.39 1.40 1.41 .43 .44 1.45 12 .46 1.47 1.49 1.50 1.51 1.52 1.54 .55 .56 1.57 13 .58 1.60 1.61 1.62 1.63 1.65 1.66 1.67 .68 1.69 14 .71 1.72 1.73 1.74 1.75 1.77 1.78 1.79 1.80 1.82 15 .83 1.84 1.85 1.86 1.88 1.89 1.90 1.91 1.93 1.94 16 1.95 1.96 1.97 1.99 2.00 2.01 2.02 2.04 2.05 2.06 17 2.07 2.08 2.10 2.11 2.12 2.13 2.14 2.16 2.17 2.18 18 2.19 2.21 2.22 2.23 2.24 2.25 2.27 2.28 2.29 2.30 19 2.32 2.33 2.34 2.35 2.36 2.38 2.39 2.40 2.41 2.42 20 2.44 2.45 2.46 2.47 2.49 2.50 2.51 2.52 2-53 2.55 21 2.56 2.57 2.58 2.60 2.61 2.62 2.63 2.64 2.66 2.67 22 2.68 2.69 2.71 2.72 2.73 2.74 2.75 2.77 2.78 2.79 23 2.80 2.81 2.83 2.84 2.85 2.86 2.88 2.89 2.90 2.91 24 2.92 2.94 2.95 2.96 2.97 2.99 3.00 3.01 3.02 3.03 25 3.05 3.06 3.07 3.08 3.10 3.11 3.12 3.13 3.14 3.16 26 3.17 3.18 3.19 3.20 3.22 3.23 3.24 3.25 3.27 3.28 27 3.29 3.30 3.31 3.33 3.34 3.35 3.36 3.38 3.39 3.40 28 3.41 3.42 3.44 3.45 3.46 3.47 3.49 3.50 3.51 3.52 29 3.53 3.55 3.56 3.57 3.58 3.59 3.61 3.62 3.63 3.64 30 3.66 3.67 3.68 3.69 3.70 3.72 3.73 3.74 3.75 3.77 31 3.78 3.79 3.80 3.81 3.83 3.84 3.85 3.86 3.88 3.89 32 3.90 3.91 3.92 3.94 3.95 3.96 3.97 3.98 4.00 4.01 33 4.02 4.03 4.05 4.06 4.07 4.08 4.09 4.11 4.12 4.13 34 4.14 4.16 4.17 4.18 4.19 4.20 4.22 4.23 4.24 4.25 35 4.26 4.28 4.29 4.30 4.31 4.33 4.34 4.35 4.36 4.37 O. 1. 2. 3. 4. 5. 6. 7. 8. 9. c 112 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. Centi- grade Degrees BAROMETER : 760ram (from 757.51 to 762.50). Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.04 0.05 0.06 0.07 0.09 0.10 0.11 1 0.12 0.13 0.15 0.16 0.17 0.18 0.20 0.21 0.22 0.23 2 0.25 0.26 0.27 0.28 0.29 0.31 0.32 0.33 0.34 0.36 3 0.37 0.38 0.39 0.40 0.42 0.43 0.44 0.45 0.47 0.48 4 0.49 0.50 0.52 0.53 0.54 0.55 0.56 0.58 0.59 0.60 5 0.61 0.63 0.64 0.65 0.66 0.67 0.69 0.70 0.71 0.72 6 0.74 0.75 0.76 0.77 0.79 0.80 0.81 0.82 0.83 0.85 7 0.86 0.87 0.88 0.90 0.91 0.92 0.93 0.94 0.96 0.97 8 0.98 0.99 1.01 .02 1.03 1.04 1.05 1.07 1.08 1.09 9 1.10 1.12 1.13 .14 1.15 1.17 1.18 1.19 1.20 1.21 10 1.23 1.24 1.25 .26 1.28 1.29 1.30 1.31 1.32 1.34 11 1.35 1.36 1.S7 .39 .40 1.41 1.42 1.44 1.45 1.46 12 1.47 1.48 1.50 .51 .52 1.53 1.55 1.56 1.57 1.58 13 1.59 1.61 1.62 .63 .64 1.66 1.67 1.68 1.69 1.71 14 1.72 1.73 1.74 .75 .77 1.78 1.79 1.80 1.82 1.83 15 1.84 1.85 1.86 1.88 .89 1.90 1.91 1.93 1.94 1.95 16 1.96 1.97 1.99 2.00 2.01 2.02 2.04 2.05 2.06 2.07 17 2.09 2.10 2.11 2.12 2.13 2.15 2.16 2.17 2.18 2.20 18 2.21 2.22 2.23 2.24 2.26 2.27 2.28 2.29 2.31 2-32 19 2.33 2.34 2.36 2.37 2.38 2.39 2.40 2-42 2.43 2.44 20 2.45 2.47 2.48 2.49 2.50 2.51 2.53 2.54 2.55 2.56 21 2.58 2.59 2.60 2.61 2.63 2.64 2.65 2.66 2.67 2.69 22 2.70 2.71 2.72 2.74 2.75 2.76 2.77 2.78 2.80 2.81 23 2.82 2.83 2.85 2.86 2.87 2.88 2.89 2.91 2.92 2.93 24 2.94 2.96 2.97 2.98 2.99 3.01 3.02 3.03 3.04 3.05 25 3.07 3-08 3.09 3.10 3.12 3.13 3.14 3.15 3.16 3.18 26 3.19 3-20 3.21 3.23 3.24 3-25 3.26 3.28 3.29 3.30 27 3.31 3-32 3.34 3.35 3.36 3.37 3.39 3.40 3.41 3.42 28 3.43 3-45 3.46 3.47 3.48 3.50 3.51 3.52 3.53 3.54 29 3.56 3-57 3.58 3.59 3.61 3.62 3-63 3.64 3.66 S.67 30 3.68 3-69 3.70 3.72 3.73 3-74 3.75 3.77 3.78 3.79 31 3.80 3.81 3.83 3.84 3-85 3.86 3-88 3.89 3.90 3.91 32 3.93 3-94 3.95 3.96 3.97 3.99 4.00 4.01 4.02 4.04 33 4.05 4-06 4.07 4.08 4.10 4-11 4.12 4.13 4.15 4.16 34 4.17 4-18 4.20 4.21 4.22 4.23 4.24 4.26 4.27 4.28 35 4.29 4-31 4.32 4.33 4.34 4.35 4.37 4.38 4.39 4.40 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. c 113 33 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. Centi- grade Degrees. BAROMETER : 765mra (from 762.51 to 767.50). Tenths of Degrees. o. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0 Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. M Him. 0 0.00 0.01 0.02 0.04 0.05 0.06 0.07 0.09 0.10 0.11 1 0.12 0.14 0.15 0.16 0.17 0.19 0.20 0.21 0.22 0.23 2 0.25 0.26 0.27 0.28 0.30 0.31 0.32 0.33 0.35 0.36 3 0.37 0.38 0.40 0.41 0.42 0.43 0.44 0.46 0.47 0.48 4 0.49 0.51 0.52 0.53 0.54 0.56 0.57 0.58 0.59 0.61 5 0.62 0.63 0.64 0.65 0.67 0.68 0.69 0.70 0.72 0.73 6 0.74 0.75 0.77 0.78 0.79 0.80 0.82 0.83 0.84 0.85 7 0.86 0.88 0.89 0.90 0.91 0.93 0-94 0.95 0-96 0.98 8 0.99 1.00 1.01 1.02 .04 .05 1.06 1.07 1.09 .10 9 1.11 1.12 1.14 1.15 .16 .17 1.19 1.20 1.21 .22 10 1.23 1.25 1.26 1.27 .28 .30 1.31 1.32 1.33 .35 11 1.36 .37 .38 1.40 .41 .42 1.43 1.44 1.46 .47 12 1.48 .49 .51 1.52 .53 .54 1.56 1.57 1.58 .59 13 1.61 .62 .63 1.64 .65 .67 1.68 1.69 1.70 .72 14 1.73 .74 .75 1.77 .78 .79 1.80 1.82 1.83 .84 15 1.85 .86 .88 1.89 1.90 .91 1.93 1.94 1-95 .96 16 1.98 1.99 2.00 2.01 2.02 2.04 2.05 2.06 2.07 2.09 17 2.10 2.11 2.12 2.14 2.15 2.16 2.17 2.19 2.20 2.21 18 2.22 2.23 2.25 2.26 2.27 2.28 2.30 2.31 2.32 2.33 19 2.35 2.36 2.37 2.38 2.40 2.41 2.42 2.43 2.44 2.46 20 2.47 2.48 2.49 2.51 2.52 2.53 2.54 2.56 2.57 2.58 21 2.59 2.61 2.62 2.63 2.64 2.65 2.67 2.68 2.69 2.70 22 2.72 2.73 2.74 2.75 2.77 2.78 2.79 2.80 2.82 2.83 23 2-84 2.85 2.86 2.88 2.89 2.90 2.91 2.93 2.94 2.95 24 2.96 2.98 2.99 3.00 3.01 3.03 3.04 3.05 3.06 3.07 25 3.09 3.10 3.11 3.12 3.14 3.15 3.16 3.17 3.19 3.20 26 3.21 3.22 3.23 3.25 3.26 3.27 3.28 3.30 3.31 3.32 27 3.33 3.35 3.36 3.37 3.38 3.40 3.41 3.42 3.43 3.44 28 3.46 3.47 3.48 3.49 3.51 3.52 3.53 3.54 3.56 3.57 29 3.58 3.59 3.61 3.62 3.63 3.64 3.65 3.67 3.68 3.69 30 3.70 3.72 3.73 3.74 3.75 3.77 3.78 3.79 3.80 3.82 31 3.83 3.84 3.85 3.86 3.88 3.89 3.90 3.91 3.93 3.94 32 3.95 3.96 3.98 3.99 4.00 4.01 4.03 4.04 4.05 4.06 33 4.07 4.09 4.10 4.11 4.12 4.14 4.15 4.16 4.17 4.19 34 4.20 4.21 4.22 4.24 4.25 4.26 4.27 4.28 4.30 4.31 35 4.32 4.33 4.35 4.36 4.37 4.38 4.40 4.41 4.42 4.43 O. 1. 2. 3. 4. 5. 6. 7. 8. 9. 114 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. 34 BAROMETER : 770mra- (from 767.51 to 772.50). Centi- grade Tenths of Degrees. Decrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.02 0.04 0.05 0.06 0.07 0.09 0.10 0.11 1 0.12 0.14 0.15 0.16 0.17 0.19 0.20 0.21 0.22 0.24 2 0.25 0.26 0.27 0.29 0.30 0.31 0.32 0.34 0.35 0.36 3 0.37 0.39 0.40 0.41 0.42 0.43 0.45 0.46 0.47 0.48 4 0.50 0.51 0.52 0.53 0.55 0.56 0.57 0.58 0.60 0.61 5 0.62 0.63 0.65 0.66 0.67 0.68 0.70 0.71 0.72 0.73 6 0.75 0.76 0.77 0.78 0.80 0.81 0.82 0.83 0.85 0.86 7 0.87 0.88 0.89 0.91 0.92 0.93 0.94 0.96 0.97 0.98 8 0.99 1.01 1.02 1.03 1.04 1.06 1.07 1.08 .09 1.11 9 .12 1.13 .14 1.16 .17 1.18 1.19 1.21 .22 1.23 10 .24 1.26 .27 1.28 .29 1.30 1.32 1.33 .34 1.35 11 .37 1.38 .39 .40 .42 1.43 1.44 1.45 .47 1.48 12 .49 1.50 .52 .53 .54 1-55 1.57 1.58 .59 1.60 13 .62 1.63 .64 .65 .67 1.68 1.69 1.70 .72 1.73 14 .74 1.75 .76 .78 .79 1.80 1.81 1.83 .84 1.85 15 1.86 1.88 1.89 .90 1.91 1.93 1.94 1.95 .96 1.98 16 1.99 2.00 2.01 2.03 2.04 2.05 2.06 2.08 2.09 2.10 17 2.11 2.13 2.14 2.15 2.16 2.17 2.19 2.20 2.21 2.22 18 2.24 2.25 2.26 2.27 2.29 2.30 2.31 2.32 2.34 2.35 19 2.36 2.37 2.39 2.40 2.41 2.42 2.44 2.45 2.46 2.47 20 2.49 2.50 2.51 2.52 2.54 2.55 2.56 2.57 2.58 2.60 21 2.61 2.62 2.63 2.65 2.66 2.67 2.68 2.70 2.71 2.72 22 2.73 2.75 2.76 2.77 2.78 2.80 2.81 2.82 2.83 2.85 23 2.86 2.87 2.88 2.90 2.91 2.92 2.93 2.95 2.96 2.97 24 2.98 3.00 3.01 3.02 3.03 3.04 3.06 3.07 3.08 3.09 25 3.11 3.12 3.13 3.14 3.16 3.17 3.18 3.19 3.21 3.22 26 3.23 3.24 3-26 3.27 3.28 3.29 3.31 3.32 3.33 3.34 27 3.36 3.37 3.38 3.39 3.41 3.42 3.43 3.44 3.45 3.47 28 3.48 3.49 3-50 3.52 3.53 3.54 3.55 3.57 3.58 3.59 29 3.60 3.62 3.63 3.64 3.65 3.67 3.68 3.69 3.70 3.72 30 3.73 3.74 3.75 3.77 3.78 3.79 3.80 3.82 3.83 3.84 31 3.85 3.87 3.88 3.89 3.90 3.91 3.93 3.94 3.95 3.96 32 3.98 3.99 4.00 4.01 4.03 4.04 4.05 4.06 4.08 4.09 33 4.10 4.11 4.13 4.14 4.15 4.16 4.18 4.19 4.20 4.21 34 4.23 4.24 4.25 4.26 4.28 4.29 4.30 4.31 4.32 4.34 35 4.35 4.36 4.37 4.39 4.40 4.41 4.42 4.44 4.45 4.46 0. 1. 2. 3. 4. 5. 6. ?. §. 9. c 115 35 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. BAROMETER : 775mm- (from 772.51 to 777.50). Centi- grade Tenths of Degrees. Degrees. O. 1. 2. 3. 4. 5. 6. 7. 8. 9. o Millim. Millim. Millim. Millim. Millim Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.03 0.04 0.05 0.06 0.08 0.09 0.10 0.11 1 0.13 0.14 0.15 0.16 0.18 0.19 0.20 0.21 0.23 0.24 2 0.25 0.26 0.28 0.29 0.30 0.31 0.33 0.34 0.35 0.36 3 0.38 0.39 0.40 0.41 0.43 0.44 0.45 0.46 0.48 0.49 4 0.50 0.51 0.53 0.54 0.55 0.56 0.58 0.59 0.60 0.61 5 0.63 0.64 0.65 0.66 0.68 0.69 0.70 0.71 0.73 0.74 6 0.75 0.76 0.78 0.79 0.80 0.81 0.83 0.84 0.85 0.86 7 0.88 0.89 0.90 0.91 0.93 0.94 0.95 0.96 0.98 0.99 8 1.00 1.01 .03 1.04 .05 1.06 1.08 .09 1.10 1.11 9 1.13 1.14 .15 .16 .18 1.19 1.20 .21 1.23 1.24 10 1.25 1.26 .28 .29 .30 1.31 1.33 .34 1.35 1.36 11 1.38 1.39 .40 .41 .43 1.44 1.45 .46 1.48 1.49 12 1.50 1.51 .53 .54 .55 1.56 1.58 .59 1.60 1.61 13 1.63 1.64 .65 .66 1.68 1.69 1.70 .71 1.73 1.74 14 1.75 1.76 .78 .79 1.80 1.81 1.83 .84 1.85 1.86 15 1.88 1.89 .90 .91 1.93 1.94 1.95 .96 1.98 1.99 16 2.00 2.01 2.03 2.04 2.05 2.06 2.08 2.09 2.10 2.11 17 2.13 2.14 2.15 2.16 2.18 2.19 2.20 2.21 2.23 2.24 18 2.25 2.26 2.28 2.29 2.30 2.31 2.33 2.34 2.35 2.36 19 2.38 2.39 2.40 2.41 2.43 2.44 2.45 2.46 2.48 2.49 20 2.50 2.51 2.53 2.54 2.55 2.56 2.58 2.59 2.60 2.61 21 2.63 2.64 2.65 2.66 2.68 2.69 2.70 2.71 2.73 2.74 22 2.75 2.76 2.78 2.79 2.80 2.81 2.83 2.84 2.85 2.86 23 2.88 2.89 2.90 2.91 2.93 2.94 2.95 2.96 2.98 2.99 24 3.00 3.01 3.03 3.04 3.05 3.06 3.08 3.09 3.10 3.11 25 3.13 3.14 3.15 3.16 3.18 3.19 3.20 8.21 3.23 3.24 26 3.25 3.26 3.28 3.29 3.30 3.31 3.33 3.34 3.35 3.36 27 3.38 3.39 3.40 3.41 8.43 8.44 3.45 8.46 3.48 3.49 28 3.50 3.51 3.53 3.54 3.55 3.56 3.58 3.59 3.60 3.61 29 3.63 3.64 3.65 3.66 3.68 3.69 8.70 8.72 8.73 3.74 30 3.75 3.77 3.78 3.79 3.80 3.82 3.83 3.84 3-85 3.87 31 3.88 3.89 3.90 3.92 3.93 3.94 3.95 3.97 3.98 3.99 32 4.00 4.02 4.03 4.04 4.05 4.07 4.08 4.09 4-10 4.12 33 4.13 4.14 4.15 4.17 4.18 4.19 4.20 4.22 4.23 4.24 34 4.25 4.27 4.28 4.29 4.30 4.32 4.33 4.34 4.35 4.37 35 4.38 4.39 4.40 4.42 4.43 4.44 4.45 4.47 4.48 4.49 0. 1. 2. 3. 4. S. 6. 7. 8. 9. c 116 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. Centi- grade Degrees. BAROMETER : 780mm- (from 777.51 to 782.50). Tenths of Degrees. 0. 1. 2. 3. 4* 5. 6. 7. 8. 9. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.03 0.04 0.05 0.06 0.08 0.09 0.10 0.11 1 0.13 0.14 0.15 0.16 0.18 0.19 0.20 0.21 0.23 0.24 2 0.25 0.26 0.28 0.29 0.30 0.31 0.33 0.34 0.35 0.37 3 0.38 0.39 0.40 0.42 0.43 0.44 0.45 0.47 0.48 0.49 4 0.50 0.52 0.53 0.54 0.55 0.57 0.58 0.59 0.60 0.62 5 0.63 0.64 0.65 0.67 0.68 0.69 0.70 0.72 0.73 0.74 6 0.76 0.77 0.78 0.79 0.81 0.82 0.83 0.84 0.86 0.87 7 0.88 0.89 0.91 0.92 0.93 0.94 0.96 0.97 0.98 0.99 8 1.01 1.02 .03 .04 .06 1.07 1.08 1.10 1.11 1.12 9 1.13 1.15 .16 .17 .18 1.20 1.21 1.22 1.23 1.25 10 1.26 1.27 .28 .30 .31 1.32 1.33 1.35 .36 1.37 11 1.38 1.40 .41 .42 .44 1.45 1.46 1.47 .49 1.50 12 1.51 1.52 .54 .55 .56 1.57 1.59 1.60 1.61 1.62 13 1.64 1.65 1.66 .67 .69 1.70 1.71 1.72 1.74 1.75 14 1.76 1.78 1.79 1.80 .81 1.83 1.84 1.85 1.86 1.88 15 1.89 1.90 1.91 1.93 .94 1.95 1.96 1.98 1.99 2.00 16 2.01 2.03 2.04 2.05 2.06 2.08 2.09 2.10 2.11 2.13 17 2.14 2.15 2.17 2.18 2.19 2.20 2.22 2.23 2.24 2.25 18 2.27 2.28 2.29 2.30 2.32 2.33 2.34 2.35 2.37 2-38 19 2.39 2.40 2.42 2.43 2.44 2.45 2.47 2.48 2.49 2.51 20 2.52 2.53 2.54 2.56 2.57 2.58 2.59 2.61 2.62 2.63 21 2.64 2.66 2.67 2.68 2.69 2.71 2.72 2.73 2.74 2.76 22 2.77 2.78 2.79 2.81 2.82 2.83 2.85 2.86 2.87 2.86 23 2.90 2.91 2.92 2.93 2.95 2.96 2.97 2.98 3.00 3.01 24 3.02 3.03 3.05 3.06 3.07 3.08 3.10 3.11 3.12 3.14 25 3.15 3.16 3.17 3.19 3.20 3.21 3.22 3.24 3.25 3.26 26 3.27 3.29 3.30 3.31 3.32 3.34 3.35 3.36 3.37 3.39 27 3.40 3.41 3.42 3.44 3.45 3.46 3.47 3.49 3.50 3.51 28 3.52 3.54 3.55 3.56 3.58 3.59 3.60 3.61 3.68 3.64 29 3.65 3.66 3.68 3.69 3.70 3.71 3.73 3.74 3.75 3.76 30 3.78 3.79 3.80 3.81 3.83 3.84 3.85 3.86 3.88 3.89 31 3.90 3.92 3.93 3.94 3.95 3.97 3.98 3.99 4.00 4.02 32 4.03 4.04 4.05 4.07 4.08 4.09 4.10 4.12 4.13 4.14 33 4.15 4.17 4.18 4.19 4.20 4.22 4.23 4.24 4.26 4.27 34 4.28 4.29 4.31 4.32 4.33 4.34 4.36 4.37 4.38 4.39 35 4.41 4.42 4.43 4.44 4.46 4.47 4.48 4.49 4.51 4.52 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 117 37 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. Centi grade Degrees. BAROMETER : 785rara (from 782.51 to 787.50). Tenths of Degreea. o. 1. 2. 3. 4. 5. 6. y. 8. 9. 0 0 Millim. 0.00 Millim. 0.01 Millim. 0.03 Millim. 0.04 Millim. 0.05 Millim. 0.06 Millim. 0.08 Millim. 0.09 Millim. 0.10 Millim. 0.11 1 0.13 0.14 0.15 0.16 0.18 0.19 0.20 0.22 0.23 0.24 2 0.25 0.27 0.28 0.29 0.30 0.32 0.33 0.34 0.35 0.37 3 0.38 0.39 0.41 0.42 0.43 0.44 0.46 0.47 0.48 0.49 4 0.51 0.52 0.53 0.54 0.56 0.57 0.58 0.60 0.61 0.62 5 0.63 0.65 0.66 0.67 0.68 0.70 0.71 0.72 0.73 0.75 6 ^0.76 0.77 0.79 0.80 0.81 0.82 0.84 0.85 0.86 0.87 7 0.89 0.90 0.91 0.92 0.94 0.95 0.96 0.98 0.99 1.00 8 1.01 1.03 1.04 1.05 1.06 1.08 1.09 .10 1.11 1.13 9 1.14 1.15 1.17 1.18 1.19 1.20 1.22 .23 1.24 1.25 10 1.27 1.28 1.29 1.30 1.32 1.33 1.34 .36 1.37 1.38 11 1.39 1.41 1.42 1.43 1.44 1.46 1.47 .48 1.50 1.51 12 1.52 1.53 1.55 1.56 1.57 1.58 1.60 .61 1.62 1.63 13 1.65 1.66 1.67 1.69 1.70 1.71 1.72 .74 1.75 1.76 14 1.77 1.79 1.80 1.81 1.82 1.84 1.85 1.86 1.88 1.89 15 1.90 1.91 1.93 1.94 1.95 1.96 1.98 1.99 2.00 2.01 16 2.03 2.04 2.05 2.07 2.08 2.09 2.10 2.12 2.13 2.14 17 2.15 2.17 2.18 2.19 2.20 2.22 2.23 2.24 2.26 2.27 18 2.28 2.29 2.31 2.32 2.33 2.34 2.36 2.37 2.38 2.39 19 2.41 2.42 2.43 2.45 2.46 2.47 2.48 2.50 2.51 2.52 20 2.53 2.55 2.56 2.57 2.58 2.60 2.61 2.62 2.64 2.65 21 2.66 2.67 2.69 2.70 2.71 2.72 2.74 2.75 2.76 2.77 22 2.79 2.80 2.81 2.83 2.84 2.85 2.86 2.88 2.89 2.90 23 2-91 2.93 2.94 2.95 2.96 2.98 2.99 3.00 3.02 3.03 24 3.04 3.05 3.07 3.08 3.09 3.10 3.12 3.13 3.14 3.15 25 3.17 3.18 3.19 3.21 3.22 3.23 3.24 3.26 3.27 3.28 26 3.29 3.31 3.32 3.33 3.34 3.36 3.37 3-38 3.40 3.41 27 3.42 3.43 3.45 3.46 3.47 3.48 3.50 3.51 3.52 3.53 28 3.55 3.56 3.57 3.59 3.60 3.61 3.62 3.64 3.65 3.66 29 3.67 3.69 3.70 3.71 3.72 3.74 3.75 3.76 3.78 3.79 30 3.80 3.81 3.83 3.84 3.85 3.86 3.88 3.89 3.90 3.91 31 3.93 3.94 3.95 3.97 3.98 3.99 4.00 4.02 4.03 4.04 32 4.05 4.07 4.08 4.09 4.11 4.12 4.13 4.14 4,16 4.17 33 4.18 4.19 4.21 4.22 4.23 4.24 4.26 4.27 4.28 4.30 34 4.31 4.32 4.33 4.35 4.36 4.37 4.38 4.40 4.41 4.42 35 4.43 4.45 4.46 2. 4.47 4.49 4.50 4.51 4.52 4.54 4.55 0. If 3. 4. 5. 6. 7. 8. 9. c 118 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. 38 BAROMETER : 790rara- (from 787.51 to 792.50). Centi- grade Tenths of Degrees. Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. o M Him. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.03 0.04 0.05 0.06 0.08 0.09 0.10 0.11 1 0.13 0.14 0.15 0.17 0.18 0.19 0.20 0.22 0.23 0.24 2 0.26 0.27 0.28 0.29 0.31 0.32 0.33 0.34 0.36 0.37 3 0.38 0.40 0.41 0.42 0.43 0.45 0.46 0.47 0.48 0.50 4 0.51 0.52 0.54 0.55 0.56 0.57 0.59 0.60 0.61 0.62 5 0.64 0.65 0.66 0.68 0.69 0.70 0.71 0.73 0.74 0.75 6 0.77 0.78 0.79 0.80 0.82 0.83 0.84 0.85 0.87 0.88 7 0.89 0.91 0.92 0.93 0.94 0.96 0.97 0.98 0.99 1.01 8 .02 .03 1.05 .06 .07 1.08 .10 1.11 .12 1.13 9 .15 .16 1.17 .19 .20 1.21 .22 1.24 .25 1.26 10 .28 .29 1.30 .31 .33 1.34 .35 1.36 .38 1.39 11 .40 .42 1.43 .44 .45 .47 .48 1.49 .50 1.52 12 .53 .54 1.56 .57 .58 .59 .61 1.62 .63 1.64 13 .66 .67 1.68 .70 .71 .72 .73 1.75 .76 1.77 14 .79 1.80 1.81 .82 .84 .85 .86 1.87 .89 1.90 15 1.91 1.93 1.94 .95 .96 .98 .99 2.00 2.01 2.03 16 2.04 2.05 2.07 2.08 2.09 2.10 2.12 2.13 2.14 2.15 17 2.17 2.18 2.19 2.21 2.22 2.23 2.24 2.26 2.27 2.28 18 2.30 2.31 2.32 2.33 2.35 2.36 2.37 2.38 2.40 2.41 19 2.42 2.44 2.45 2.46 2.47 2.49 2.50 2.51 2.52 2.54 20 2.55 2.56 2.58 2.59 2.60 2.61 2.63 2.64 2.65 2.66 21 2.68 2.69 2.70 2.72 2.73 2.74 2.75 2.77 2.78 2.79 22 2.81 2.82 2.83 2.84 2.86 2.87 2.88 2.89 2.91 2.92 23 2.93 2.95 2.96 2.97 2.98 3.00 3.01 3.02 3.03 3.05 24 3.06 3.07 3.09 3.10 3.11 3.12 3.14 3.15 3.16 3.17 25 3.19 3.20 3.21 3.23 3.24 3.25 3.26 3.28 3.29 3.30 26 3.32 3.33 3.34 3.35 3.37 3.38 3.39 3.40 3.42 3.43 27 3.44 3.46 3.47 3.48 3.49 3.51 3.52 3.53 3.54 3.56 28 3.57 3.58 3.60 3.61 3.62 3.63 3.65 3.66 3.67 3.68 29 3.70 3.71 3.72 3.74 3.75 3.76 3.77 3.79 3.80 3.81 30 3.83 3.84 3.85 3.86 3.88 3.89 3.90 3.91 3.93 3.94 31 3.95 3.97 3.98 3.99 4.00 4.02 4.03 4.04 4.05 4.07 32 4.08 4.09 4.11 4.12 4.13 4.14 4.16 4.17 4.18 4.19 33 4.21 4.22 4.23 4.25 4.26 4.27 4.28 4.30 4.31 4.32 34 4.34 4.35 4.36 4.37 4.39 4.40 4.41 4.42 4.44 4.45 35 4.46 4.48 4.49 4.50 4.51 4.53 4.54 4.55 4.56 4.58 O. 1. 2. 3. 4. 5. 6. 7. 8. 9. G 119 39 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. Centi- grade Degrees BAROMETER : 795rara (from 792.51 to 797.50). Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. •7. 8. 9. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 0 0.00 0.01 0.03 0.04 0.05 0.06 0.08 0.09 0.10 0.12 1 0.13 0.14 0.15 0.17 0.18 0.19 0.21 0.22 0.23 0.24 2 0.26 0.27 0.28 0.30 0.31 0.32 0.33 0.35 0.36 0.37 3 0.38 0.40 0.41 0.42 0.44 0.45 0.46 0.47 0.49 0.50 4 0.51 0-53 0.54 0.55 0.56 0.58 0.59 0.60 0.62 0.63 5 0.64 0.65 0.67 0.68 0.69 0.71 0.72 0.73 0.74 0.76 6 0.77 0.78 0.80 0.81 0.82 0.83 0.85 0.86 0.87 0.89 7 0.90 0.91 0.92 0.94 0.95 0.96 0.98 0.99 1.00 1.01 8 1.03 1.04 1.05 1.06 1.08 1.09 1.10 1.12 1.13 1.14 9 1.15 1.17 1.18 1.19 1.21 1.22 1.23 1.24 1.26 1.27 10 1.28 1.30 1.31 1.32 1.33 1.35 1.36 1.37 1.39 1.40 11 1.41 1-42 1.44 1.45 1.46 1.48 1.49 1.50 1.51 1.53 12 1.54 1.55 1.57 1.58 1.59 1.60 1.62 1.63 1.64 1.66 13 1.67 1.68 1.69 1.71 1.72 1.73 1.75 1.76 1.77 1.78 14 1.80 1.81 1.82 1.83 1.85 1.86 1.87 1.89 1.90 1.91 15 1.92 1.94 1.95 1.96 1.98 1.99 2.00 2.01 2.03 2.04 16 2.05 2.07 2.08 2.09 2.10 2.12 2.13 2.14 2.16 2.17 17 2.18 2-19 2.21 2.22 2.23 2.25 2.26 2.27 2.28 2.30 18 2.31 2.32 2.34 2.35 2.36 2.37 2.39 2.40 2.41 2.43 19 2.44 2.45 2.46 2.48 2.49 2.50 2.51 2.53 2.54 2.55 20 2.57 2.58 2.59 2.60 2.62 2.63 2.64 2.66 2.67 2.68 21 2.69 2.71 2.72 2.73 2.75 2.76 2.77 2.78 2.80 2.81 22 2.82 2.84 2.85 2.86 2.87 2.89 2.90 2.91 2.93 2.94 23 2.95 2.96 2.98 2.99 3.00 3.02 3.03 3.04 3.05 3.07 24 3.08 3.09 3.11 3.12 3.13 3.14 3.16 3.17 3.18 3.19 25 3.21 3.22 3.23 3.25 3.26 3.27 3.28 3.30 3.31 3.32 26 3.34 3.35 3.36 3.37 3.39 3.40 3.41 3.43 3.44 3.45 27 3.46 3.48 3.49 3.50 3.52 3.53 3.54 3.55 3.57 3.58 28 3.59 3.61 3.62 3.63 3.64 3.66 3.67 3.68 3.70 3.71 29 3.72 3.73 3.75 3.76 3.77 3.79 3.80 3.81 3.82 3.84 30 3.85 3.86 3.88 3.89 3.90 3.91 3.93 3.94 3.95 3.96 31 3.98 3.99 4.00 4.02 4-03 4.04 4-05 4.07 4.08 4.09 32 4.11 4.12 4.13 4.14 4.16 4.17 4.18 4.20 4.21 4.22 33 4.23 4.25 4.26 4.27 4.29 4.30 4.31 4.32 4.34 4.35 34 4.36 4.38 4.39 4.40 4-41 4.43 4.44 4.45 4.47 4.48 35 4.49 4.50 4.52 4.53 4.54 4.56 4.57 4.58 4.59 4-61 O. 1. 2. 3. 4. 5. 6. 7. 8. 9. (J 120 REDUCTION OF THE BAROMETER TO THE FREEZING POINT. 40 Centi- grade Degrees. BAROMETER : 800ram- (from 797.51 to 802.50). Tenths of Degrees. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0 0 Millim. 0.00 Millim. 0.01 Millim. 0.03 Millim. 0.04 Millim. 0.05 Millim. 0.06 Millim. 0.08 Millim. 0.09 Millim. 0.10 Millim. 0.12 1 0.13 0.14 0.15 0.17 0.18 0.19 0.21 0.22 0.23 0.25 2 0.26 0.27 0.28 0.30 0.31 0.32 0.34 0.35 0.36 0.37 3 0.39 0.40 0.41 0.43 0.44 0.45 0.46 0.48 0.49 0.50 4 0.52 0.53 0.54 0.56 0.57 0.58 0.59 0.61 0.62 0.63 5 0.65 0.66 0.67 0.68 0.70 0.71 0.72 0.74 0.75 0.76 6 0.77 0.79 0.80 0.81 0.83 0.84 0.85 0.87 0.88 0.89 7 0.90 0.92 0.93 0.94 0.96 0.97 0.98 0.99 .01 1.02 8 1.03 1.05 1.06 1.07 1.08 1.10 1.11 1.12 .14 1.15 9 1.16 1.17 1.19 1.20 1.21 1.23 1.24 1.25 .27 1.28 10 1.29 1.30 1.32 1.33 1.34 1.36 1.37 1.38 .39 1.41 11 1.42 1.43 1.45 .46 1.47 1.48 1.50 1.51 .52 1.54 12 1.55 1.56 1.58 .59 1.60 1.61 1.63 1.64 .65 1.67 13 1.68 1.69 1.70 .72 1.73 1.74 1.76 1.77 •78 1.79 14 1.81 1.82 1.83 .85 1.86 1.87 1.89 1.90 .91 1.92 15 1.94 1.95 1.96 .98 1.99 2.00 2.01 2.03 2.04 2.05 16 2.07 2.08 2.09 2.10 2.12 2.13 2.14 2.16 2.17 2.18 17 2.20 2.21 2.22 2.23 2.25 2.26 2.27 2.29 2.30 2.31 18 2.32 2.34 2.35 2.36 2.38 2.39 2.40 2.41 2.43 2.44 19 2.45 2.47 2.48 2.49 2.50 2.52 2.53 2.54 2.56 2.57 20 2.58 2.60 2.61 2.62 2.63 2.65 2.66 2.67 2.69 2.70 21 2.71 2.72 2.74 2.75 2.76 2.78 2.79 2.80 2.81 2.83 22 2.84 2.85 2.87 2.88 2.89 2.91 2.92 2.93 2.94 2.96 23 2.97 2.98 3.00 3.01 3.02 3.03 3.05 3.06 3.07 3.09 24 3.10 3.11 3.12 3.14 3.15 3.16 3.18 3.19 3.20 3.22 25 3.23 3.24 3.25 3.27 3.28 3.29 3.31 3.32 3.33 3.34 26 3.36 3.37 3.38 3.40 3.41 3.42 3.43 3.45 3.46 3.47 27 3.49 3.50 3.51 3.52 3.54 3.55 3.56 3.58 3.59 3.60 28 3.62 3.63 3.64 3.65 3.67 3.68 3.69 3.71 3.72 3.73 29 3.74 3.76 3.77 3.78 3.80 3.81 3.82 3.83 3.85 3.86 30 3.87 3.89 3.90 3.91 3.93 3.94 3.95 3.96 3.98 3.99 31 4.00 4.02 4.03 4.04 4.05 4.07 4.08 4.09 4.11 4.12 32 4.13 4.14 4.16 4.17 4.18 4.20 4.21 4.22 4.24 4.25 33 4.26 4.27 4.29 4.30 4.31 4.33 4.34 4.35 4.36 4.38 34 4.39 4.40 4.42 4.43 4.44 4.45 4.47 4.48 4.49 4.51 35 4.52 4.53 4.55 4.56 4.57 4.58 4.60 6. 4.61 4.62 4.64 0. 1. 2. 3. 4. 5. 7. 8. 9. 121 XXI. OLD FRENCH BAROMETER. TABLE FOB aEDUCING TO THE FREEZING POINT THE OBSERVATIONS TAKEN WITH OLD FRENCH BAROMETERS, PROVIDED WITH BRASS SCALES, EXTENDING FROM THE CISTERN TO THB TOP OF THE MERCURIAL COLUMN; CALCULATED FROM 240 TO 345 LINES, OR FROM 23 INCHES 4 LINES TO 28 INCHES 9 LINES. BY KAEMTZ. 123 TABLE XXI. This table is taken from KAEMTZ'S Lehrbuch der Meteorologie, Vol. II. p. 21 To render it more useful, the first page, giving the corrections for Barometri Heights between 240 and 280 Paris lines, has been added. The values* adopted by Kaemtz for reducing the Old French Barometer are i following : — Let h = observed height in French lines. " t = temperature of attached thermometer in degrees of Reaumur. " m = expansion of mercury between 0 and 80° Reaumur = 0.018018. " I = linear expansion of brass between 0 and 80° Reaumur = 0.0018782. The normal temperature of standard being = 13° Reaumur. And the formula becomes, — __-, mxt-l(t-l3) 1 -\- m X t The Table gives the corrections only for full degrees and for every fifth line ; 1 the intermediate values can easily be found by an interpolation at sight. Example of Reduction. Observed height ... . . . = 325.32 lines. Attached thermometer = 12.5 Reaumur. In the line beginning with 12°, and hi the vertical column headed 325 lines, we find, Correction for 12° = — 0.89 lines. Interpolation for 0°.5 = — 0.03 " Correction for 12°.5 = — 0.92 " And we have, Observed height, 325.32 " Correction for 12°.5, — 0.92 " Height at the freezing point = 324.40 lines. 124 XXI. REDUCTION OF THE OLD FRENCH BAROMETER TO THE FREEZING POINT. Normal Temperature of the Scale = 13° Reaumur. Attached Thermom- eter. Degrees of Reaumur. Barometer in Paris Lines. Attached \ Thermom- eter. Degrees of Reaumur. 240 245 250 255 260 265 27O 275 0 -15 Par. Lines. +0.65 Par Lines. +0.66 Par. Lines. +0.68 Par. Lines. +0.69 Par. Lines. +0.70 Par. Lines. +0.72 Par. Lines. +0.73 Par. Lines. +0.75 o -15 -14 0.60 0.61 0.63 0.64 0.65 0.67 0.68 0.69 -14 -13 0.55 0.57 0.58 0.59 0.60 0.61 0.62 0.64 -13 -12 0.51 0.52 0.53 0.54 0.55 0.56 0.57 0.58 -12 -11 0.46 0.47 0.48 0.49 0.50 0.51 0.52 0.52 -11 -10 0.41 0.42 0.43 0.44 0.44 0.45 0.46 0.47 -10 - 9 +0.36 +0.37 +0.38 +0.38 +0.39 +0.40 +0.41 +0.41 - 9 - 8 0.31 0.32 0.33 0.33 0.34 0.35 0.35 0.36 - 8 - 7 0.27 0.27 0.28 0.28 0.29 0.29 0.30 0.30 - 7 - 6 0.22 0.22 0.23 0.23 0.24 0.24 0.24 0.25 - 6 - 5 0.17 0.17 0.18 0.18 0.18 0.19 0.19 0.19 - 5 - 4 +0.12 +0.12 +0.13 +0.13 +0.13 +0.13 +0.14 +0.14 - 4 - 3 0.07 0.07 0.08 0.08 0.08 0.08 0.08 0.08 - 3 - 2 +0.02 +0.03 +0.03 +0.03 +0.03 +0.03 +0.03 +0.03 - 2 - 1 -0.02 -0.03 -0.03 -0.03 -0.03 -0.03 -0.03 -0.03 - 1 0 -0.07 -0.07 -0.08 -0.08 -0.08 -0.08 -0.08 -0.08 0 + 1 -0.12 -0.12 -0.13 -0.13 -0.13 -0.13 -0.14 -0.14 + 1 2 0.17 0.17 0.18 0.18 0.18 0.19 0.19 0.19 2 3 0.22 0.22 0.23 0.23 0.24 0.24 0.24 0.25 3 4 0.27 0.27 0.28 0.28 0.29 0.29 0.30 0.30 4 5 0.31 0.32 0.33 0.33 0.34 0.35 0.35 0.36 5 + 6 -0.36 -0.37 -0.38 -0.38 -0.39 -0.40 -0.41 -0.41 + 6 7 0.41 0.42 0.43 0.44 0.44 0.45 0.46 0.47 7 8 0.46 0.47 0.48 0.49 0.50 0.51 0.52 0.52 8 9 0.51 0.52 0.53 0.54 0.55 0.56 0.57 0.58 9 10 0.55 0.57 0.58 0.59 0.60 0.61 0.62 0.64 10 +11 -0.60 -0.61 -0.63 -0.64 -0.65 -0.67 -0.68 -0.69 +11 12 0.65 0.66 0.68 0.69 0.70 0.72 0.73 0.75 12 13 0.70 0.71 0.73 0.74 0.76 0.77 0.79 0.80 13 14 0.75 0.76 0.78 0.79 0.81 0.82 0.84 0.86 14 15 0.80 0.81 0.83 0.84 0.86 0.88 0.89 0.91 15 +16 -0.84 -0.86 -0.88 -0.90 -0.91 -0.93 -0.95 -0.97 +16 17 0.89 0.91 0.93 0.95 0.97 0.98 1.00 1.02 17 18 0.94 0.96 0.98 1.00 .02 1.04 1.06 1.08 18 19 0.99 .01 .03 1.05 .07 1.09 1.11 1.13 19 20 1.04 .06 .08 1.10 .12 1.14 1.17 1.19 20 +21 -1.08 - .11 - .13 -1.15 - .17 -1.20 -1.22 -1.24 +21 22 1.13 .16 .18 1.20 .23 1.25 1.27 1.30 22 23 1.18 .20 .23 1.25 .28 1.30 1.33 1.35 23 24 1.23 .25 .28 1.31 .33 1.36 1.38 1.41 24 25 1.28 .30 .33 1.36 .38 1.41 1.44 1.46 25 125 REDUCTION OF THE OLD FRENCH BAROMETER TO THE FREEZING POINT. Normal Temperature of the Scale = 13° Reaumur. Attached Thermom- eter. Degrees of Reaumur. Barometer in Paris Lines. Attached Thermom- eter. Degrees of Reaumur. 280 285 29O 295 300 305 310 o Par. Lines. Par. Lines. Par. Lines. Par. Lines. Par. Lines. Par. Lines. Par. Lines. 0 -15 +0.77 +0.78 +0.79 +0.81 J-0.82 +0.84 +0.85 -15 -14 0.71 0.73 0.74 0.75 0.76 0.77 0.79 -14 -13 0.65 0.67 0.68 0.69 0.70 0.71 0.72 -13 -12 0.60 0.61 0.62 0.63 0.64 0.65 0.66 -12 -11 0.54 0.55 0.56 0.57 0.58 0.59 0.60 -11 -10 0.48 0.49 0.50 0.51 0.52 0.53 0.54 -10 - 9 +0.43 +0.44 +0.44 +0.45 +0.46 +0.46 +0.47 - 9 - 8 0.37 0.38 0.38 0.39 0.40 0.40 0.41 - 8 - 7 0.31 0.32 0.32 0.33 0.34 0.34 0.35 - 7 - 6 0.26 0.26 0.26 0.27 0.27 0.28 0.28 - 6 - 5 0.20 0.20 0.21 0.21 0.21 0.22 0.22 - 5 - 4 +0.14 +0.15 +0.15 +0.15 +0.15 +0.16 +0.16 - 4 - 3 0.09 0.09 0.09 0.09 0.09 0.09 0.09 - 3 - 2 +0.03 +0.03 +0.03 +0.03 +0.03 +0.03 +0.03 - 2 - 1 -0.03 -0.03 -0.03 -0.03 -0.03 -0.03 -0.03 - 1 0 -0.08 -0.09 -0.09 -0.09 -0.09 -0.09 -0.09 0 + 1 -0.14 -0.14 -0.15 -0.15 -0.15 -0.15 -0.16 + 1 2 0.20 0.20 0.21 0.21 0.21 0.22 0.22 2 3 0.26 0.26 0.27 0.27 0.27 0.28 0.28 3 4 0.31 0.32 0.32 0.33 0.33 0.34 0.35 4 5 0.37 0.37 0.38 0.39 0.40 0.40 0.41 5 + 6 -0.43 -0.43 -0.44 -0.45 -0.46 -0.46 ,-0.47 + 6 7 0.48 0.49 0.50 0.51 0.52 0.53 0.53 7 8 0.54 0.55 0.56 0.57 0.58 0.59 0.60 8 9 0.60 0.61 0.62 0.63 0.64 0.65 0.66 9 10 0.65 0.66 0.68 0.69 0.70 0.71 0.72 10 +11 -0.71 -0.72 -0.74 -0.75 -0.76 -0.77 -0.79 +11 12 0.77 0.78 0.80 0.81 0.82 0.84 0.85 12 13 0.82 0.84 0.85 0.87 0.88 0.90 0.91 13 14 0.88 0.90 0.91 0.93 0.94 0.96 0.98 14 15 0.94 0.95 0.97 0.99 1.00 1.02 1.04 15 +16 -0.99 -1.01 - .03 -1.05 - .07 -1.08 - .10 +16 17 .05 1.07 .09 1.11 .13 1.15 .16 17 18 .11 1.13 .15 1.17 .19 1.21 .23 18 19 .16 1.18 .21 1.23 .25 1.27 .29 19 20 .22 1.24 .27 1.29 .31 1.33 .35 20 +21 - .28 -1.30 - .33 -1.35 - .37 -1.89 - .42 +21 22 .34 1.36 .38 1.41 .43 1.45 .48 22 23 .39 1.41 .44 1.47 .49 1.52 .54 23 24 .45 1.47 .50 1.53 .55 1.58 .60 24 25 .50 1.53 .56 1.59 .61 1.64 .67 25 126 REDUCTION OF THE OLD FRENCH BAROMETER TO THE FREEZING POINT. Normal Temperature of the Scale = 13° Reaumur. Attached Thermom- eter. Degrees of Reaumur. Barometer in Paris Lines. Attached Thermom- eter. Degrees of Reaumur. 315 320 325 330 335 340 345 o Par. Lines. Par. Lines. Par. Lines Par. Lines. Par. Lines. Par. Lines. Par. Lines. o -15 +0.86 +0.88 +0.89 +0.90 +0.92 +0.93 +0.95 -15 -14 0.80 0.81 0.83 0.84 0.85 0.86 0.88 -14 -13 0.74 0.75 0.76 0.78 0.78 0.79 0.81 -13 -12 0.67 0.68 0.69 0.70 0.71 0.73 0.74 -12 -11 0.61 0.62 0.63 0.64 0.65 0.66 ' 0.67 -11 -10 0.54 0.55 0.56 0.57 0.58 0.59 0.60 -10 - 9 +0.48 +0.49 +0.50 +0.50 +0.51 +0.52 +0.53 - 9 - 8 0.42 0.42 0.43 0.44 0.44 0.45 0.46 - 8 - 7 0.35 0.36 0.36 0.37 0.37 0.38 0.39 - 7 - 6 0.29 0.29 0.30 0.30 0.31 0.31 0.32 - 6 - 5 0.22 0.23 0.23 0.24 0.24 0.24 0.25 - 5 - 4 +0.16 +0.16 +0.17 +0.17 +0.17 +0.17 +0.18 - 4 - 3 0.10 0.10 0.10 0.10 0.10 0.10 0.11 - 3 - 2 +0.03 +0.03 +0.03 +0.03 +0.03 +0.03 +0.04 - 2 - 1 -0.03 -0.03 -0.03 -0.03 -0.03 -0.03 -0.03 - 1 0 -0.10 -0.10 -0.10 -0.10 -0.10 -0.10 -0.10 0 + 1 -0.16 -0.16 -0.16 -0.17 -0.17 -0.17 -0.17 + 1 2 0.22 0.23 0.23 0.23 0.24 0.24 0.24 2 3 0.29 0.29 0.30 0.30 0.31 0.31 0.31 3 4 0.35 0.36 0.36 0.37 0.37 0.38 0.38 4 5 0.42 0.42 0.43 0.44 0.44 0.45 0.45 5 + 6 -0.48 -0.49 -0.49 -0.50 -0.51 -0.52 -0.53 + 6 7 0.54 0.55 0.56 0.57 0.58 0.59 0.60 7 8 0.61 0.62 0.63 0.64 0.65 0.66 0-67 8 9 0.67 0.68 0.69 0.70 0.71 0.72 0.74 9 10 0.74 0.75 0.76 0.77 0.78 0.79 0.81 10 +11 -0.80 -0.81 -0.82 -0.84 -0.85 -0.86 -0.88 +11 12 0.86 0.88 0.89 0.90 0.92 0.93 0.95 12 13 0.93 0.94 0.96 0.97 0.99 1.00 1.02 13 14 0.99 .01 1.02 1.04 1.05 1.07 1.09 14 15 1.05 .07 1.09 1.10 1.12 1.14 1.16 15 +16 - .12 - .14 -1.15 -1.17 -1.19 -1.21 -1.23 +16 17 .18 .20 1.22 1.24 1.26 1.28 .30 17 18 .25 .27 1.29 1.31 1.33 1.35 .37 18 19 .31 .33 135 1.37 1.39 1.41 .44 19 20 .37 .40 1.42 1.44 1.46 1.48 .51 20 +21 - .44 - .46 -1.48 -1.51 -1.53 -1.55 - .58 +21 22 .50 .53 1.55 1.57 1.60 1.62 .65 22 23 .57 .59 1.62 1.64 1.67 1.69 .72 23 24 .63 .66 1.68 1.71 1.73 1.76 .79 24 25 *- 1.69 .72 1.75 1.78 1.80 1.83 1.86 25 c 127 TABLES FOR CORRECTING THE DEPRESSION OF THE BAROMETRICAL COLUMN DUE TO CAPILLARY ACTION. C 129 CORRECTION FOR CAPILLARY ACTION. IT is known that the effects of capillary action are not the same in different liquid In a tube plunged in water, the liquid in the tube rises higher than the level of th< water in the vessel, and terminates by a concave surface, which is called a concav meniscus. In a tube plunged in mercury the liquid in the tube stands lower thai; the mercury in the vessel, and terminates by a convex surface, or a convex meniscus It is thus evident that the mercurial column in the tube of a Barometer does not rise! to its true height, and that it needs to be corrected for the depression due to capil; larity, before it indicates the real pressure of the atmosphere. La Place, in the Mecanique Celeste, Tom. IV., has shown that the value of that cor| rection depends upon the form of the meniscus, and gave a formula to compute it; As this form varies in tubes of different bores, so does the depression, which dimin-j ishes as the diameter of the tube increases. The form of the meniscus, however: was supposed to be the same in tubes of the same diameter, and constant in the same tube ; and on this supposition the tables generally used for correcting the capillary action have been computed. But more accurate observations have proved that, owing to various causes not yet all well understood, the form of the meniscus is often different in tubes of the same diameter, and that it is even variable in the tube of the same instrument. It thus became necessary to construct new tables, taking into consideration, in a given case, both the diameter of the tube and the form of the meniscus. Such tables, with a double entry, have been given by Schleiermacher, in the Bibliotheque Univer- selle de Geneve, Tom. VIII. ; by Bravais, in the Annales de Physique et de Chimie, Tom. V. p. 508 ; and by Delcros. The numbers in these tables agree very closely ; but as Delcros's table is more extended than that of Schleiermacher, and in a more convenient form than that of Bravais, it is given below, together with a reduction of it to English measures, for the ordinary use. The other tables may serve for comparison. Table XXII., from the Report of the Committee of Physics and Meteorology of the Royal Society of London, 1840, gives the correction to be applied to English barometers for capillary action in boiled and unboiled tubes. It takes into account the diameter of the tube, but not the variations of the height of the meniscus, or of the convexity which terminates the barometrical column. This last element is sup- posed to be in its normal state, and constant. Tables XXIII. and XXIV., by Delcros, in the Annuaire Meteor ologique de France, for 1849, give the means of finding the true correction to be applied to metrical barometers for capillary action. C 130 CORRECTION FOR CAPILLARY ACTION. 2 The first shows the normal height of the meniscus when in contact with the air (as is the case in the inferior branch of a siphon barometer), and in the barometric vacuum at the top of the column, in tubes of different bores. It enables the observer to judge better of its variations. Table XXIV. has been calculated by Delcros after the formulas of Schleiermacher, making the constant x equal to 6mm'.5278, being the mean value between that of Gay- Lussac = 6mm'.5262, and that of Schleiermacher = 6ram-.5295. It gives the amount of the capillary action in millimetres of mercury, taking into account both the size of the bore, or the internal radius of the tube, which will be found in the vertical argument, and the height of the meniscus, given in the horizontal argument. The internal radius of the tube is supposed to be known ; the height of the meniscus, or the vertical distance from the base, that is, from the sharp line where the mercury ceases to be in contact with the walls of the tube, to the very top of the convexity, can be ascertained by measuring it several times by means of the vernier. Example : — Suppose the internal radius of the tube to be 3mm>.2, and the height of the meniscus to be Omm-.8 ; seek in the first vertical column the number 3mra-.2 ; follow then the horizontal line as far as the vertical column headed Omrn>.8, you find there the number Ornm>.776, which is the amount of the depression due to capillary action, or the value of the correction to be added to the observation. Table XXV. is taken from Pouillet's Elements de Physique, Vol. II. p. 698 (1853). Table XXVI. is found in Gehler's Physicalisches Worterbuch, and in Schubarth, Physicalische Tabellen, p. 21. Table XXVII., which is Delcros's table reduced into English measures, gives the means of correcting with more accuracy the indications of the English barometers. For its use, see, above, the explanation to Table XXIV, Table XXVIII. is from Daily's Astronomical Tables. XXII. TABLE FOR THE CORRECTION TO .BE ADDED TO ENGLISH BAROMETERS FOR CAPILLARY ACTION. XXIII. TABLE OF THE HEIGHT OF THB MENISCUS OF THE BAROMETRICAL COLUMN. Diameter of Tube. Correction for Unboiled Tubes. Boiled Tubes. Inch. Inch. Inch. 0.60 0.004 0.002 0.50 0.007 0.003 0.45 0.010 0.005 0.40 0.014 0.007 0.35 0.020 0.010 0.30 0.028 0.014 0.25 0.040 0.020 0.20 0.060 0.029 0.15 0.088 0.044 0.10 0.142 0.070 Normal Height of the Me- Internal niscus in Millimetres. Radius of the Tube in Millimetres. In the Air. In the Vacuum. 1 0.427 0.34 2 0.795 0.64 3 .079 0.86 4 .287 1.03 5 .413 1.13 6 .488 1.19 7 .524 1.22 131 XXIV. DEPRESSION OF THE BAROMETRICAL COLUMN DUE TO CAPILLARY ACTION. *l£tf SHg£ li-i 0 O (N •<*• to CO tn in in in in O CM Tf tO 00 «5 co CO «5 tO 9 t^ Millimetres. QB • IN s co to oo »* i-i t^ CO O 3 rf CO CO CO 6666 CO tO F- O O Jt^ Tf CM O 00 . 3 3 3 3 00 o 10 o co •* 05 O CO «0 O t>- 1^ co m o 66666 • m • co m oo CO •— i O O t~- t^ oo 05 O5 ta o (N »n os T}« 00 CO O5 t^ t^ os m i— i oo m co eo co (^ . CO l>« i— i CO C>< t- 05 CO *"• t^- co i~- r-t O5 00 t^ CO •^ to t^ to o 05 t^ (N •<*• - Tf i— i en CO • CO O 66666 • •*& O *>• rf (N O OJ r4 r-i ^ r-i «o co m o *>• o> r- t^ 01 i— « oo t» co m »n m « Z53 3 in 00 CM 05 F^ f5 •* CTJ 05 CO 00 »O — i CT5 OO r-i ^ F-i 6 O 00 (N CO O O» 01 o . ISS^ST? 00 00 t^ -^ O m •<* oo - to vn i-< C3 O . rj< -. §S3S§ 66666 CO § 6 g co - m Cl 00 O CO 00 O •* •* CO (N 66666 CO O5 r* t*~ t~» T)< O 00 »O CO O tO Tf CO -<* (N O O5 00 t-- m oo cq t^ . CO 00 t» 3 CM 00 CO Tf CO gFH 6 6 6 6 • §sss§ 66666 CO O5 CD CO F-I §ntained in the atmosphere. D 9 HYPSOMETRICAL TABLES. These values have been retained in the different formulae proposed later by Gauss in Schumacher's Jahrbuch for 1840, by Schmidt, Mathem. und Physische Geographic II. p. 205, and by Baily, Astronomical Tables, p. 183, which, therefore, only change the form without changing the results. D'Aubuisson, in his formula and tables, Traiti de Geognosie, p. 488, only reduced the barometrical coefficient to its theoretical value, which he determined to be 18365 metres, leaving unchanged the other coeffi cients of Laplace's formula. Bessel first introduced, in his formula, Astronomische Nachrichten, No. 356, a sepj arate correction for the effect of moisture. The correction for the temperature oj the air is computed in his tables for two values of the coefficient, that of Gay-Lussaq 0.00375, and that of Rudberg, 0.00365. Laplace's barometrical coefficient is rej tained, but the correction for the decrease of gravity is considerably modified. In Elie Hitter's formula, in the Memoires de la Societe de Physique de Geneve Tom. XIII. p. 343, the corrections for temperature and moisture are also separated! but other values of the barometrical and thermometrical coefficients, derived fron Regnault's determinations, are used, and a new method is proposed for applying th< correction due to the expansion of air, which is made proportional to the square o the difference between the observed temperatures at each station. Baeyer's formula, recently published in Poggendorf's Annalen der Physik unt Chemie, Tom. XCVIII. p. 371, does not belong to either of the two classes just men tioned ; for while it keeps Laplace's barometrical and thermometrical coefficients, i; corrects the effect of temperature by a method analogous to that of Hitter, and it en tirely neglects the effect of aqueous vapor. In the following set the tables of Delcros, Guyot, and Loomis develop the formuU of Laplace. The much larger tables of Delcros render unnecessary those of Olt manns, which are yearly reprinted in the Annuaire du Bureau des Longitudes. In stead of Gauss's tables will be found the tables of Dippe, which are computed fron the same formula, but are more extended. Baily's tables close the first series. Tb tables of Plantamour, computed from Bessel's formula, are given here in preference t Bessel's tables, because Plantamour substituted for Laplace's barometrical coefficien that derived from the probably more accurate determination of the relative weigh of the air and mercury by Regnault, viz. 18404.8 metres. E. Ritter's tables, com puted from his own formula, give perhaps, in extreme cases, better results ; bu as, in ordinary circumstances, the altitudes obtained do not much differ from thosi furnished by the less complicated tables of Plantamour, they were not reprintei here. The miscellaneous tables which follow furnish useful materials for solving severe questions connected with the barometrical measurements. Regnault's table of Barometric Pressures corresponding to Temperatures of th< Boiling Point of Water, revised by Moritz, and its reduction to English measures, wil be found a valuable addition for thermometrical measurements of heights. The Appendix to the Hypsometrical Tables now offers, in a new form, a complet* series of tables for the comparison of the different measures of length generally use< for indicating altitudes, the convenience of which will be fully appreciated by thosi who have attempted to collect and to use the abundant contributions furnished by al civilized nations to that branch of geographical science. D 10 I. TABLES I FOR DETERMINING DIFFERENCES OF LEVEL BY MEANS OF BAROMETRICAL OBSERVATIONS, COMPUTED FROM THE COMPLETE FORMULA OF LAPLACE, BY M. T. DELCROS. Construction of the Tables. If we take z = difference of level of the two barometers, a = earth's mean radius = 6366200 metres, L = mean latitude between the two stations, and further : — f h = observed height of the barometer, Lower. < T = temperature of the barometer, C t = temperature of the air, •' . r , , . , „ ' f hf = observed height of the barometer, Upper. < T' = temperature of the barometer, C t' = temperature of the air, and if we make finally H = h -f- h1. ( eioe^)* we shall have, according to Laplace, the following general and complete equation t = 18336 metres X I ( * + 0.0028371 cos. 2. L) ((1 + i). Log. (A) + i 0.868589) after the proper transformations this equation becomes : — C __ \ -- 1000- | ( 1 + 0.0028371 cos. 2. L) . . . . = Log. (,) 18336 n^es X which can be done without sensible error, the above formula takes the following form, sufficiently accurate for practical purposes : — z = Log. (-|). 18336 metres X 0, (2. (t + t'\ -1 IBST) (1 + 0.0028371 cos. 2. L) 1 1 _L * + I5926\ V1 ~T~ 6366200 ) the four factors of which can easily be developed in tables, as has been done by Mr. Oltmanns. But though this savant chose to develop also the second factor, I found | it better not to do so, partly because the calculation of it is very easy, and also oz: account of the great extent it would have been necessary to give to this table, in : order to avoid troublesome interpolations. In the calculation of h'. (^f ), Mr. Oltmanns used the constant coefficient of the absolute expansion of the mercurial column ; I took that of the relative expansion of the mercury and of the brass scale. It is obvious, therefore, that if the scale of the barometer employed was of wood, glass, iron, or of another substance, it would be necessary to make use of as many different coefficients, and the Table II. j could not be used. Moreover, Oltmanns combined the last two factors of the gen- eral formula in one single table with double entry. This table I have calculated, extending it sufficiently to avoid a double interpolation ; but as it seemed to me much too extensive, I substituted for it Tables III. and IV., which are more condensed, without rendering any troublesome interpolation necessary. I carried the calculation of these tables beyond the limits at which Oltmanns chose to stop, in order that they may answer for the most extreme cases. At the head of each table will be found the factor of which it is the development ; this makes any other explanation superfluous. All these tables give, at sight, the numbers wanted ; only when very great pre- cision is desired, a slight interpolation, ai sight, and very easy to apply, may be re- quired. My principal object was to relieve the computer of the troublesome and annoying labor of interpolations. 1 added to these four tables the small Table V., taken from the Annuaire du Bureau des Longitudes of Paris. It will be seldom used. When calculating differences of level, in the same order, with the tables, and by the complete formula of Laplace, the results thus obtained never differ by more than one decimetre in the most extreme cases. The following example will illustrate this statement. I take the observation made in a balloon, by Gay-Lussac, at Paris, as an extreme case, which is very well adapted to manifest the errors of the tables, if there were any, by comparing the results obtained by means of them with those of the direct calculation according to the complete formula of Laplace, from which they are derived. D 12 BAROMETRICAL MEASUREMENT OF HEIGHTS. Example of Calculation by the complete Formula of Laplace Height of the Balloon of Gay-Lussac. The observation gave : — ly the Tables mm. Balloon h' = 328.80 Paris h =765.68 T7 = — 9.5 T = + 30.8 t' = — 9.5 t = + 30.8 T — T' = + 40.3 (* + *') = + 21.3 et 2 (t + t') = 42°.6 With these data the formula of Laplace gives the following calculation : — Log. h'. = 328.80 = 2.5169318 Log. (T — T') = + 40.3 = 1.6053050 Log. dilat. coefficient = 0.0001614 = 6.2079035 Milli. Corr. a = + 2.14 log. = 0.3301403 A' = 328.80 H = 330.94 log. = 2.5197480 log. h = 765.68 = 2.8840473 (Log. h — Log. H) = Difference of Log. Log. of (Log. h — log. H) = Log. general coefficient = 18336 = = 0.3642993 9.5614583 4.2633046 Log. ( (4) 18336 ) = (A + a) = 3.8247629 Corresponding number = 6679.79 = (A -|- a) Log. cos. 2 L = 97° 40' = — 9.1251872 Log. constant = 0.0028371 = + 7.4528746 Log. (A + a) = 6679.79. = + 3.8247629 Log. ( (0.0028371. Cos. 2 L) X (A + a) ) = — 0.4028247 Milli. Corresponding number = — 2.53 6679.79 (A + a + ft) = 6677.26 Vorr. temp, air = v = 284.45 = 6961.71 15926 22887.71 6366200 = 6961.71 25.03 ^986.74 Altitude barom. Paris = \ 48.70 Metres. = (6.677 X 42.6) Log. . . . = 4.3596022 Log. . . . =3.1961197 Log. . . . = 3.8427153 Log. = + 1.3984372 Altitude of balloon = 7035.44 by the formula of Laplace. D 13 BAROMETRICAL MEASUREMENT OF HEIGHTS. Now let us calculate by the tables, placing side by side the corresponding results given by the formula of Laplace. Millim. o o Balloon h' = 328.80 T' = — 9.5 f = — 9.5 Paris h = 765.68 T = + 30.8 t = + 30.8 Metres. L f h' = 328.80 ) ,_ . ( 1478.4 By the formula of Wlth { h = 765.68 I TaWe L glV6S i 8209.8 Laplace we found : A = 6731.4 with (T' — T) = — 40°.3, Table II. gives a = —52.0 - Metres. (A + a) = 6679.4 6679.79 with L = 48° 50', Table HI. gives a = — 2.3 — 2.53 (A + a + /3) = 6677.1 6677.26 with 2 (t + t') direct calculation gives v = + 284.5 + 284.45 (A -f a + j3 + v) = 6961.6 6961.71 with 6960, Table IV. gives 8 = + 25.1 + 25.03 = 6986.7 6986.74 Altitude of barometer at Paris = + 48.7 + 48.70 Therefore altitude of balloon = 7035.4 7035.44 Two results which are sensibly identical. This ought not to astonish us ; the tables being the exact development of the formula, they ought to give the same results, provided hi both cases nothing has been neglected, and the four factors have been calculated in the same relative order. DELCROS. Disposition and Use of the Tables. The disposition of the tables is the following : — In Table L, the first column on the left contains the height of the barometer millimetres, corrected for the error of the instrument. The second column headed N (number), gives in metres the first two figures of the number corresponding to each height of the barometer in the first column ; the third column, headed 0.0, gives the remaining figures for the full number of milli- metres ; the following columns give the remaining figures for the same number of millimetres and each decimal fraction of a millimetre which may follow it. The value of the hundredths is to be found in the last column. Example: — Height of Barometer = 761.00. We look out in the first column for the number 761, and we find on the same line in the second column, 81 ; in the third column, headed 0.0, or full number, 61.1. The corresponding number is thus 8161.1 metres. D 14 BAROMETRICAL MEASUREMENT OF HEIGHTS. Height of barometer = 761.35. The second column gives 81 ; the column headed 0.3 gives, on the same line, 64.2. The corresponding number is then 8164.2. Adding the value of five hundredths of miilim., being Om*.5, as indicated in the last column, we have 8164.7 metres, cor- responding to 761.35 miilim. The other four tables need no further explanation. To calculate, by means of the tables, a difference of level from two barometrical observations, proceed in the following manner : — 1. Take the height of the barometer at the lower station, or 7t, and seek in Table I. the number corresponding to this height. Seek likewise the number cor- responding to the height of the barometer at the upper station. Subtract the second from the first. The remainder is the approximate difference of level between the two stations. Then apply the following corrections. 2. Correction to be applied for the temperature of the barometers. If T7 be the temperature of the attached thermometer at the upper station, and T that of the attached thermometer at the lower station, take the difference, or T' — T, and seek in Table II. the number corresponding to this difference. When T' is smaller than T, that is, when the temperature of the attached ther- mometer of the upper station is lower than that of the lower station, the correction is to be subtracted from the approximate height ; when T' is greater than T, it is to be added. 3. Correction for the temperature of the air. The first correction having been applied, multiply the number obtained, or N, by the double sum of the temperatures of the air at both stations, and divide the prod- uct by 1000 ; the number thus found, or the quantity expressed by ~. 2 (t -{- t') is the correction in metres which is to be added to the preceding number N. 4. Tables III. and IV. give two corrections ; the first due to the decrease of gravitation in latitude, which is to be added when the mean latitude of the places of observation is between the 45th parallel and the equator ; and to be subtracted when it is between the same parallel and the poles, as indicated at the head of the columns. The second correction, due to the decrease of gravitation on the vertical line, is always additive. 5. Table V. gives another small correction to be added in the case of the lower station being very elevated above the level of the ocean. EXAMPLES OF CALCULATION. Measurement of the Height of Guanaxuato. By M. de Humboldt. o Barometer at the upper station, h' — 600.95 T' = 21.3 t1 = 21.3 Barometer at the level of the sea, h — 763.15 T = 25.3 t = 25.3 D 15 BAROMETRICAL MEASUREMENT OF HEIGHTS. Table I. gives the corresponding numbers, Difference, Table II. gives for T' — T, JL. 2 (t + t>) = 1.897 X 93.2, Table III. gives for mean latitude of 21°, Difference, Sum, h = 8183.5 h' = 6280.8 1902.7 — 5.2 1897.5 = N + 176.8 2074.3 + 4.3 Table IV. gives for decrease of gravitation in the vertical line, -|- 6.0 Hence altitude of Guanaxuato above the ocean, 2084.6 Measurement of the height of Mont Blanc, August 29, 1844. By MM. Bravais and Martins. mm. Q o Barometer at one metre below the summit, h' = 424.05 T' = — 4.2 t' = — 7.6 Barometer of the Observatory of Geneva, h = 729.65 T == 18.6 t = 19.3 Table I. gives for numbers corresponding to ( h = 7826.0 \ h' = 3504.4 Table II. gives for T' — T, Difference, 4321.6 — 29.3 Difference, 4292.3 1= N iSo- 2 (* + 0 = 4292 x 23.4 = + 100.4 Table III. gives for the mean latitude of Sum, 46°, 4392.7 — 0.4 Difference, Table IV. for decrease of gravitation in the vertical line Table V. for the elevation of the lower station, Sum, Elevation of the lower barometer above the ocean, 4392.3 + 13.7 + 0.5 4406.5 407.0 Hence elevation of upper barometer above the ocean, 4813.5 Finally, height of the summit of Mont Blanc above the ocean, 4814.5 D 16 BAROMETRICAL MEASUREMENT OF HEIGHTS. DELCROS. TABLE I. — Giving A = 18336 X log. H or h...., argument H or h in Millimetres. . Barom- Parts eter fiT or h. N. 0.0 0.1 0.2 0.3 0.4 0.5 0.6 O.7 0.8 0.9 for each 0.01mm. Milli. Metr. Metres. Metres. Metres. Metres. Metres Metres. Metres. Metres. Metres. Metres. Metr. 288 4 23.4 26.2 28.9 31.7 34.4 37.2 40.0 42.7 45.5 48.2 1 0.3 289 4 51.0 53.8 56.5 59.3 62.0 64.8 67.5 70.3 73.0 75.8 2 0.5 290 4 78.5 81.3 84.0 86.7 89.5 92.2 95.0 97.7 3 0.8 290 5 00.4 03.2 4 1.1 291 5 05.9 08.7 11.4 14.1 16.8 19.6 22.3 25.0 27.8 30.5 5 1.4 292 5 33.2 36.0 38.7 41.4 44.1 46.8 49.6 52.3 55.0 57.7 6 1.6 293 5 60.5 63.2 65.9 68.6 71.3 74.0 76.7 79.5 82.2 84.9 7 1.9 2,94 5 87.6 90.3 93.0 95.7 98.4 8 2.2 294 6 01.1 03.8 06.5 09.2 11.9 9 2.4 295 6 14.6 17.3 20.0 22.7 25.4 28.1 30.8 33.5 36.2 38.9 296 6 41.6* 44.3 47.0 49.6 52.3 55.0 57.7 60.4 63.1 65.8 297 6 68.4 71.1 73.8 76.5 79.1 81.8 84.5 87.2 89.9 92.5 298 6 95.2 97.9 298 7 00.5 03.2 05.9 08.6 11.2 13.9 16.6 19.2 299 7 21.9 24.5 27.2 29.9 32.5 35.2 37.8 40.5 43.2 45.8 300 7 48.5 51.1 53.8 56.4 59.1 61.7 64.4 67.0 69.7 72.3 301 7 75.0 77.6 80.3 82.9 85.5 88.2 90.8 93.5 96.1 98.7 302 8 01.4 04.0 06.6 09.3 11.9 14.5 17.2 19.8 22.4 25.1 303 8 27.7 30.3 33.0 35.6 38.2 40.8 43.5 46.1 48.6 51.3 304 8 54.0 56.6 59.2 61.8 64.4 67.0 69.6 72.3 74.9 77.5 305 8 80.1 82.7 85.3 87.9 90.5 93.1 95.7 98.3 305 9 01.0 03.6 306 9 06.2 08.8 11.4 14.0 16.6 19.2 21.8 24.4 27.0 29.6 1 0.3 307 9 32.1 34.7 37.3 39.9 42.5 45.1 47.7 50.3 52.9 55.5 2 0.5 308 9 58.0 60.6 63.2 65.8 68.4 70.9 73.5 76.1 78.7 81.3 3 0.8 309 9 83.9 86.4 89.0 91.6 94.1 96.7 99.3 4 1.0 309 10 01.9 04.4 07.0 5 1.3 310 10 09.6 12.1 14.7 17.3 19.8 22.4 25.0 27.5 30.1 32.7 6 1.5 311 10 35.2 37.8 40.3 42.9 45.5 48.0 50.6 53.1 55.7 58.2 7 1.8 312 10 60.8 63.3 65.9 68.4 71.0 73.5 76.1 78.6 81.2 83.7 8 2.1 313 10 86.3 88.8 91.4 93.9 96.4 99.0 9 2.3 313 11 01.5 04.1 06.6 09.1 314 11 11.7 14.2 16.7 19.3 21.8 24.3 26.9 29.4 31.9 34.5 315 11 37.0 39.5 42.0 44.6 47.1 49.6 52.1 54.7 57.2 59.7 316 11 62.2 64.8 67.3 69.8 72.3 74.8 77.3 79.9 82.4 84.9 317 11 87.4 89.9 92.4 94.9 97.4 99.9 317 12 02.4 05.0 07.5 10.0 318 12 12.5 15.0 17.5 20.0 22.5 25.0 27.5 30.0 32.5 35.0 319 12 37.5 40.0 42.5 45.0 47.5 50.0 52.4 54.9 57.4 59.9 320 12 62.4 64.9 67.4 69.9 72.3 74.8 77.3 79.8 82.3 84.8 321 12 87.2 89.7 92.2 94.7 92.1 99.6 321 13 02.1 04.6 07.1 09.5 322 13 12.0 14.5 17.0 19.4 21.9 24.4 26.8 29.3 31.8 34.2 323 13 36.7 39.2 41.6 44.1 46.6 49.0 51.5 53.9 56.4 58.9 , 324 13 61.3 63.8 66.2 68.7 71.1 73.6 76.1 78.5 81.0 83.4 325 13 85.9 88.3 90.8 93.2 95.7 98.1 325 14 00.5 03.0 05.4 07.9 Barom- eter N. 0.0 0.1 0.2 0.3 0.4 O.5 0.6 0.7 0.8 O.9 Parts for each florh. 0.01mm. D 17 BAROMETRICAL MEASUREMENT OF HEIGHTS. DELCROS. 326 to 364ram. Barom- Parts eter Horh. N. o.o O.I 0.2 0.3 O.4 O.5 O.6 O.7 O.8 0.9 for each 0.01mm. Milli. Metr. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres Metres. Metres Metr. 326 14 10.3 12.8 15.2 17.6 20.1 22.5 25.0 27.4 29.8 32.3 1 0.2 327 14 34.7 37.2 39.6 42.0 44.5 46.9 49.3 51.7 54.2 56.6 2 0.5 328 14 59.0 61.5 63.9 66.3 68.7 71.2 73.6 76.0 78.4 80.9 3 0.7 329 14 83.3 85.7 88.1 90.5 92.9 95.4 97.8 4 1.0 329 15 00.2 02.6 05.0 5 1.2 330 15 07.4 09.9 12.3 14.7 17.1 19.5 21.9 24.3 26.7 29.1 6 1.5 331 15 31.5 33.9 36.3 38.7 41.2 43.6 46.0 48.4 50.8 53.2 7 1.7 332 15 55.6 58.0 60.4 62.8 65.1 67.5 69.9 72.3 74.7 77.1 8 2.0 333 15 79.5 81.9 84.3 86.7 89.1 91.4 93.8 96.2 98.6 9 2.2 333 16 01.0 334 16 03.4 05.8 08.1 10.5 12.9 15.3 17.7 20.0 22.4 24.8 335 16 27.2 29.6 31.9 34.3 36.7 39.1 41.4 43.8 46.2 48.8 336 16 50.9 53.3 55.7 58.0 60.4 62.8 65.1 67.5 69.9 72.2 1 0.2 337 16 74.6 77.0 79.3 81.7 84.0 86.4 88.8 91.1 93.5 95.8 2 0.4 338 16 98.2 3 0.7 338 17 00.5 02.9 05.2 07.6 10.0 12.3 14.7 17.0 19.4 4 1.0 339 17 21.7 24.1 26.4 28.8 31.1 33.4 35.8 38.1 40.5 42.8 5 1.2 340 17 45.2 47.5 49.8 52.2 54.5 56.9 59.2 61.5 63.9 66.2 6 1.5 341 17 68.6 70.9 73.2 75.6 77.9 80.2 82.6 84.9 87.2 89.5 7 1.7 342 17 91.9 94.2 96.5 98.9 8 1.9 342 18 01.2 03.5 05.8 08.2 10.5 12.8 9 2.2 343 18 15.1 17.4 19.8 22.1 24.4 26.7 29.0 31.4 33.7 36.0 344 18 38.3 40.6 42.9 45.2 47.6 49.9 52.2 54.5 56.8 59.1 345 18 61.4 63.7 66.0 68.3 70.6 73.0 75.3 77.6 79.9 82.2 346 18 84.5 86.8 89.1 91.4 93.7 96.0 98.3 346 19 00.6 02.9 05.2 347 19 07.5 09.6 12.0 14.3 16.6 18.9 21.2 23.5 25.8 28.1 348 19 30.4 32.7 34.9 37.2 39.5 41.8 44.1 46.4 48.6 50.9 349 19 53.2 55.5 57.8 60.1 62.3 64.6 66.9 69.2 71.5 73.7 350 19 76.0 78.3 80.6 82.8 85.1 87.4 89.6 91.9 94.2 96.5 1 0.2 351 19 98.7 2 0.4 351 20 01.0 03.3 05.5 07.8 10.1 12.3 14.6 16.8 19.1 3 0-7 352 20 21.4 23.6 25.9 28.2 30.4 32.7 34.9 37.2 39.5 41.7 4 0.9 353 20 44.0 46.2 48.5 50.7 53.0 55.2 57.5 59.7 62.0 64.2 5 1.1 354 20 66.5 68.7 71.0 73.2 75.5 77.7 80.0 82.2 84.5 86.7 6 1.3 355 20 89.0 91.2 93.4 95.7 97.9 7 1.6 355 21 00.2 02.4 04.6 06.9 09.1 8 1.8 356 21 11.4 13.6 15.8 18.1 20.8 22.5 24.8 27.0 29.2 31.5 9 2.1 357 21 33.7 35.9 38.2 40.4 42.6 44.8 47.1 49.3 51.5 53.7 358 21 56.0 58.2 60.4 62.6 64.9 67.1 69.3 71.5 73.7 76.0 359 21 78.2 80.4 82.6 84,8 87.0 89.3 91.5 93.7 95.9 98.1 360 22 00.3 02.5 04.8 07.0 09.2 11.4 13.6 15.8 18.0 20.2 361 22 22.4 24.6 26.8 29.0 31.2 33.4 35.6 37.9 40.1 42.3 362 22 44.5 46.7 48.9 51.0 53.2 55.4 57.6 59.8 62.0 64.2 363 22 66.4 68.6 70.8 73.0 75.2 77.4 79.6 81.8 83.9 86.1 364 22 88.3 90.5 92.7 94.9 97.1 99.3 364 23 01.4 03.6 05.8 08.0 Barom- eter Horh. N. 0.0 0.1 O.2 0.3 0.4 O.5 O.6 0.7 0.8 0.9 Parts or each .Olmm. 18 BAROMETRICAL MEASUREMENT OF HEIGHTS. DELCROS. 365 to 4O3mm\ Barom- eter Horh. N. 0.0 O.I 0.2 O.3 0.4 0.5 0.6 O.7 0.8 0.9 Parts for each 0.01mm. Milli. Metr. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metr. 365 23 10.2 12.4 14.5 16.7 18.9 21.1 23.2 25.4 27.6 29.8 1 0.2 366 23 32.0 34.1 36.3 38.5 40.7 42.8 45.0 47.2 49.3 51.5 2 0.4 367 23 53.7 55.9 58.0 60.2 62.4 64.5 66.7 68.9 71.0 73.2 3 0.6 368 23 75.4 77.5 79.7 81.8 84.0 86.2 88.3 90.5 92.6 94.8 4 0.9 369 23 97.0 99.1 5 1.1 369 24 01.3 03.4 05.6 07.7 09.9 12.1 14.2 16.4 6 1.3 370 24 18.5 20.6 22.8 24.9 27.1 29.2 31.4 33.5 35.7 37.8 7 1.5 371 24 40.0 42.1 44.3 46.4 48.6 50.7 52.9 55.0 57.2 59.3 8 1.7 372 24 61.5 63.6 65.8 67.9 70.1 72.2 74.3 76.5 78.6 80.8 9 1.9 373 24 82.9 85.0 87.2 89.3 91.4 93.6 95.7 97.8 99.9 373 25 02.1 374 25 04.2 06.3 08.4 10.6 12.7 14.8 16.9 19.0 21.2 23.3 375 25 25.4 27.5 29.6 31.8 33.9 36.0 38.1 40.2 42.4 44.5 376 25 46.6 48.7 50.8 53.0 55.1 57.2 59.3 61.4 63.6 65.7 377 25 67.8 69.9 72.0 74.1 76.2 78.3 80.5 82.6 84.7 86.8 378 25 88.9 91.0 93.1 95.2 97.3 99.4 378 26 01.5 03.6 05.7 07.8 379 26 09.9 12.0 14.1 16.2 18.3 20.4 22.5 24.6 26.7 28.8 380 26 30.9 33.0 35.1 37.2 39.3 41.3 43.4 45.5 47.6 49.7 381 26 51.8 53.9 56.0 58.1 60.2 62.2 64.3 66.4 68.5 70.6 382 26 72.7 74.8 76.9 78.9 81.0 83.1 85.2 87.3 89.3 91.4 383 26 93.5 95.6 97.7 99.7 383 27 01.8 03.9 06.0 08.1 10.1 12.2 1 0.2 384 27 14.3 16.4 18.4 20.5 22.6 24.6 26.7 28.8 30.9 32.9 2 0.4 385 27 35.0 37.1 39.1 41.2 43.2 45.3 47.4 49.4 51.5 53.5 3 0.6 386 27 55.6 57.7 59.7 61.8 63.8 65.9 68.0 70.0 72.1 74.1 4 0.9 387 27 76.2 78.3 80.3 82.4 84.4 86.5 88.6 90.6 92.7 94.7 5 1.1 388 27 96.8 98.8 6 1.3 388 28 00.9 02.9 05.0 07.0 09.1 11.1 13.2 15.2 7 1.5 389 28 17.3 19.3 21.4 23.4 25.5 27.5 29.6 31.6 33.7 35.7 8 1.7 390 28 37.8 39.8 41.9 43.9 46.0 48.0 50.0 52.1 54.1 56.2 9 1.9 i 391 28 58.2 60.2 62.3 64.3 66.3 68.3 70.4 72.4 74.4 76.5 392 28 78.5 80.5 82.6 84.6 86.6 88.6 90.7 92.7 94.7 96.8 393 28 98.8 393 29 00.8 02.8 04.9 06.9 08.9 10.9 12.9 15.0 17.0 394 29 19.0 21.0 23.0 25.1 27.1 29.1 31.1 33.1 35.2 37.2 395 29 39.2 41.2 43.2 45.2 47.2 49.2 51.3 53.3 55.3 57.3 396 29 59.3 61.3 63.3 65.3 67.3 69.3 71.4 73.4 75.4 77.4 397 29 79.4 81.4 83.4 85.4 87.4 89.4 91.5 93.5 95.5 97.5 398 29 99.5 398 30 01.5 03.5 05.5 07.5 09.5 11.5 13.5 15.5 17.5 399 30 19.5 21.5 23.5 25.5 27.5 29.4 31.4 33.4 35.4 37.4 400 30 39.4 41.4 43.4 45.4 47.4 49.4 51.3 53.3 55.3 57.3 401 30 59.3 61.3 63.3 65.2 67.2 69.2 71.2 73.2 75.1 77.1 402 30 79.1 81.1 83.1 85.0 87.0 89.0 91.0 93.0 94.9 96.9 403 30 98.9 larom- etep i or h. N. 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 O.8 0.9 Parts or each 0.01mm. D 19 BAROMETRICAL MEASUREMENT OF HEIGHTS. DELCROS. 4O3 to 442mm . Parts eler Horh. N. o.o 0.1 0.2 0.3 O.4 O.5 0.6 0.7 0.8 0.9 for each 0.01mm. Milli. Metr. Metres. Metres. Metres. Metres. Metres Metres. Metres. Metres. Metres. Metres. Metr. 403 31 00.9 02.8 04.8 06.8 08.7 10.7 12.7 14.7 16.6 1 0.2 404 31 18.6 20.6 22.5 24.5 26.5 28.4 30.4 32.4 34.4 36.3 2 0.4 405 31 38.3 40.3 42.2 44.2 46.1 48.1 50.1 52.0 54.0 55.9 3 0.6 406 31 57.9 59.9 61.8 63.8 65.7 67.7 69.7 71.6 73.6 75.5 4 0.8 407 31 77.5 79.5 81.4 83.4 85.3 87.3 89.3 91.2 93.2 95.1 5 1.0 408 31 97.1 99.0 6 1.2 408 32 01.0 02.9 04.9 06.8 08.8 10.7 12.7 14.6 7 1.4 409 32 16.6 18.5 20.5 22.4 24.4 26.3 28.2 30.2 32.1 34.1 8 1.6 410 32 36.0 37.9 39.9 41.8 43.8 45.7 47.6 49.6 51.5 53.5 9 1.8 411 32 55.4 57.3 59.3 61.2 63.2 65.1 67.0 69.0 70.9 72.9 412 32 74.8 76.7 78.7 80.6 82.5 84.4 86.4 88.3 90.2 92.2 413 32 94.1 96.0 97.9 99.9 413 33 01.8 03.7 05.6 07.5 09.5 11.4 414 33 13.3 15.2 17.1 19.1 21.0 22.9 24.8 26.7 28.7 30.6 415 33 32.5 34.4 36.3 38.3 40.2 42.1 44.0 45.9 47.9 49.8 416 33 51.7 53.6 55.5 57.4 59.3 61.2 63.2 65.1 67,0 68.9 417 33 70.8 72.7 74.6 76.5 78.4 80.3 82.3 84.2 86.1 88.0 418 33 89.9 91.8 93.7 95.6 97.5 99.4 418 34 01.3 03.2 05.1 07.0 419 34 08.9 10.8 12.7 14.6 16.5 18.4 20.3 22.2 24.1 26.0 420 34 27.9 29.8 31.7 33.6 35.5 37.3 39.2 41.1 43.0 44.9 421 34 46.8 48.7 50.6 52.5 54.4 56.2 58.1 60.0 61.9 63.8 422 34 65.7 67.6 69.5 71.4 73.3 75.1 77.0 78.9 80.8 82.7 1 0.2 423 34 84.6 86.5 88.4 90.2 92.1 94.0 95.9 97.8 99.6 2 0.4 423 35 01.5 3 0.6 424 35 03.4 05.3 07.2 09.0 10.9 12.8 14.7 16.6 18.4 20.3 4 0.8 5 .0 425 35 22.2 24.1 25.9 27.8 29.6 31.5 33.4 35.2 37.1 38.9 6 .2 426 35 40.8 42.7 44.5 46.4 48.3 50.1 52.0 53.9 55.8 57.6 7 .4 427 35 59.5 61.4 63.2 65.1 67.0 68.8 70.7 72.6 74.5 76.3 8 .6 428 35 78.2 80.1 81.9 83.8 85.6 87.5 89.4 91.2 93.1 94.9 9 .8 429 35 96.S 98.6 429 36 00.5 02.3 04.2 06.0 07.9 09.7 11.6 13.4 430 36 15.3 17.1 19.0 20.8 22.7 24.6 26.4 28.2 30.1 31.9 431 36 33.8 35.6 37.5 39.3 41.2 43.0 44.8 46.7 48.5 50.4 432 36 52.2 54.0 55.9 57.7 59.6 61.4 63.2 65.1 66.9 68.8 433 36 70.6 72.4 74.3 76-1 78.0 79.8 81.6 83.5 85.3 87.2 434 36 89.0 90.8 92.7 94.5 96.3 98.1 434 37 00.0 01.8 03.6 05.5 435 37 07.3 09.1 11.0 12.8 14.6 16.4 18.3 20.1 21.9 23.8 436 37 25.6 27.4 29.2 31.1 32.9 34-7 36.5 38.3 40.2 42.0 437 37 43.8 45.6 47.5 49.3 51.1 52.9 54.8 56.6 58.4 60.3 438 37 62.1 63.9 65.7 67.6 69.4 71.2 73.0 74-8 76.7 78.5 439 37 80.3 82.1 83.9 85.7 87.5 89.3 91.2 93.0 94.8 96.6 440 37 98.4 440 38 00.2 02.0 03.8 05.6 07.5 09.3 11.1 12.9 14-7 441 38 16.5 18.3 20.1 21.9 23.7 25.5 27.3 29.1 30.9 32.7 442 38 34.5 36.3 38.1 39.9 41.7 43.5 45.3 47.1 48.9 50.7 Ba.ro rn- eter Horh. N. 0.0 0.1 0.2 0.3 O.4 O.5 O.6 O.7 O.8 0.9 Parts for each 0.01mm. 20 BAROMETRICAL MEASUREMENT OF HEIGHTS. DELCROS. 443 to 482mra-. Barom- eter Horh. N. Tenth of Millimetre. Parts | for each! 0.01mm. o.o 0.1 O.2 0.3 0.4 0.5 0.6 0.7 O.8 O.9 Milli. Metr. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metr. 443 38 52.5 54.3 56.1 57.9 59.7 61.4 63.2 65.0 66.8 68.6 444 38 70.4 72.2 74.0 75.8 77.6 79.3 81.1 82.9 84.7 86.5 445 38 88.3 90.1 91.9 93.7 95.5 97.2 99.0 445 39 00.8 02.6 04.4 446 39 06.2 08.0 09.8 11.5 13.3 15.1 16.9 18.7 20.4 22.2 447 39 24.0 25.8 27.6 29.3 31.1 32.9 34.7 36.5 38.2 40.0 448 39 41.8 43.6 45.4 47.1 48.9 50.7 52.5 54.3 56.0 57.8 449 39 59.6 61.4 63.1 64.9 66.7 68.4 70.2 72.0 73.8 75.5 450 39 77.3 79.1 80.8 82.6 84.3 86.1 87.9 89.6 91.4 93.1 451 39 94.9 96.7 98.4 451 40 00.2 02.0 03.7 05.5 07.3 09.1 10.8 452 40 12.6 14.4 16.1 17.9 19.6 21.4 23.2 24.9 26.7 28.4 453 40 30.2 32.0 33.7 35.5 37.2 .39.0 40.8 42.5 44.3 46.0 454 40 47.8 49.5 51.3 53.0 54.8 56.5 58.3 60.0 61.8 63.5 455 40 65.3 67.0 68.8 70.5 72.3 74.0 75.8 77.5 79.3 81.0 1 0.2 456 40 82.8 84.5 86.3 88.0 89.8 91.5 93.2 95.0 96.7 98.5 2 0.3 457 41 00.2 01.9 03.7 05.4 07.2 08.9 10.6 12.4 14.1 15.9 3 0.5 458 41 17.6 19.3 21.1 22.8 24.6 26.3 28.0 29.8 31.5 33.3 4 0.7 459 41 35.0 36.7 38.5 40.2 41.9 43.6 45.4 47.1 48.8 50.6 5 0.9 460 41 52.3 54.0 55.8 57.5 59.2 60.9 62.7 64.4 66.1 67.9 6 1.0 461 41 69.6 71.3 73.1 74.8 76.5 78.2 80.0 81.7 83.4 85.2 7 1.2 462 41 86.9 88.6 90.3 92.1 93.8 95.5 97.2 98.9 8 1.4 462 42 00.7 02.3 9 1.6 463 42 04.1 05.8 07.5 09.3 11.0 12.7 14.4 16.1 17.9 19.6 464 42 21.3 23.0 24.7 26.4 28.1 29.8 31.6 33.3 35.0 36.7 465 42 38.4 40.1 41.8 43.5 45.2 46.9 48.7 50.4 52.1 53.8 466 42 55.5 57.2 58.9 60.6 62.3 64.0 65.8 67.5 69.2 70.9 467 42 72.6 74.3 76.0 77.7 79.4 81.1 82.8 84.5 86.2 87.9 468 42 89.6 91.3 93.0 94.7 96.4 98.1 99.8 468 43 01.5 03.2 04.9 469 43 06.6 08.3 10-0 11.7 13.4 15.1 16.8 18.5 20.2 21.9 470 43 23.6 25.3 27.0 28.7 30.4 32.0 33.7 35.4 37.1 38.8 471 43 40.5 42.2 43.9 45.6 47.3 48.9 50.6 52.3 54.0 55.7 472 43 57.4 59.1 60.8 62.5 64.2 65.8 67.5 69.2 70.9 72.6 473 43 74.3 76.0 77.7 79.3 81.0 82.7 84.4 86.1 87.7 89.4 474 43 91.1 92.8 94.5 96.1 97.8 99.5 474 44 01.2 02.9 04.5 06.2 475 44 07.9 09.6 11.2 12.9 14.6 16.2 17.9 19.6 21.3 22.9 476 44 24.6 26.3 27.9 29.6 31.3 33.9 35.6 37.3 39.0 40.6 477 44 41.3 43.0 44.6 46.3 48.0 49.6 51.3 53.0 54.7 56-3 , 478 44 58.0 59.7 61.3 63.0 64.7 66.3 68.0 69.7 71.4 73.0 479 44 74.7 76.4 78.0 79.7 81.3 83.0 84.7 86.3 88.0 89.6 480 44 91.3 93.0 94.6 96.3 97.9 99.6 480 45 01.3 02.9 04.6 06.2 481 45 07.9 09.5 11.2 12.8 14.5 16.1 17.7 19.4 21.0 22.7 482 Barom- eter Hprh. 45 N. 24.3 25.9 27.6 29.2 30.9 32.5 34.2 35.8 37.5 39.1 O.O 0.1 0.2 O.3 0.4 0.5 0.6 0.7 0.8 0.9 Parts <»r each 0.01mm. D 21 BAROMETRICAL MEASUREMENT OF HEIGHTS. DELCROS. 483 to 524mm\ Barom- Parts eter Horh. N. o.o O.I 0.2 O.3 0.4 O.5 O.6 O.7 0.8 0.9 for each 0.01mm. Milli. Metr. Metres. Metres. Metres. Metres. Metres Metres. Metres. Metres. Metres. Metres. Melr. 483 45 40.8 42.4 44.1 45.7 47.4 49.0 50.7 52.3 54.0 55.6 1 0.2 484 45 57.3 58.9 60.6 62.2 63.9 65 5 67.1 68.8 70.4 72.1 2 0.3 485 45 73.7 75.3 77.0 78.6 80.3 81.9 83.6 85.2 86.9 88.5 3 0.5 486 45 90.2 91.8 93.5 95.1 96.8 98.4 4 0.6 486 46 00.0 01.7 03.3 05.0 5 0.8 487 46 06.6 08.2 09.9 11.5 13.1 14.7 16.4 18.0 19.6 21.3 6 1.0 488 46 22.9 24.5 26.2 27.8 29.4 31.0 32.7 34.3 35.9 37.6 7 1.1 489 46 39.2 40.8 42.4 44.1 45.7 47.3 48.9 50.5 52.2 53.8 8 1.3 490 46 55.4 57.0 58.6 60.3 61.9 63.5 65.1 66.7 68.4 70.0 9 1.4 491 46 71.6 73.2 74.9 76.5 78.1 79.7 81.4 83.0 84.6 86.3 492 46 87.9 89.5 91.1 92.8 94.4 96.0 97.6 99.2 492 47 00.9 02.5' 493 47 04.1 05.7 07.3 08.9 10.5 12.1 13.8 15.4 17.0 18.6 494 47 20.2 21.8 23.4 25.0 26.6 28.2 29.9 31.5 33.1 34.7 495 47 36.3 37.9 39.5 41.1 42.7 44.3 45.9 47.5 49.1 50.7 496 47 52.3 53.9 55.5 57.1 58.7 60.3 61.9 63.5 65.1 66.7 497 47 68.3 69.9 71.5 73.1 74.7 76.3 78.0 79.6 81.2 82.8 498 47 84.4 86.0 87.6 89.2 90.8 92.4 94.0 95.6 97.2 98.8 499 48 00.4 02.0 03.6 05.2 06.8 08.3 09.9 11.5 13.1 14.7 500 48 16.3 17.9 19.5 21.1 22.7 24.2 25.8 27.4 89.0 30.6 501 48 32.2 33.8 35.4 37.0 38.6 40.1 41.7 43.3 44.9 46.5 502 48 48.1 49.7 51.3 52.9 54.5 56.0 57.6 59.2 60.8 62.4 503 48 64.0 65.6 67.2 68.7 70.3 71.9 73.5 75.1 76.6 78.2 504 48 79.8 81.4 83.0 84.5 86.1 87.7 89.3 90.9 92.4 94.0 505 48 95.6 97.2 98.7 505 49 00.3 01.9 03.4 05.0 06.6 08.2 09.7 506 49 11.3 12.9 14.4 16.0 17.6 19.1 20.7 22.3 23.9 25.4 507 49 27.0 28.6 30.1 31.7 33.3 34.8 36.4 38.0 39.6 41.1 508 49 42.7 44.3 45.8 47.4 49.0 50.5 52.1 53.7 55.3 56.8 509 49 58.4 60.0 61.5 63.1 64.6 66.2 67.8 69.3 70.9 72.4 510 49 74.0 75.6 77.1 78.7 80.2 81.8 83.4 84.9 86.5 88.0 511 49 89.6 91.2 92.7 94.3 95.8 97.4 99.0 511 50 00.5 02.1 03.6 512 50 05.2 06.7 08.3 09.8 11.4 12.9 14.5 16.0 17.6 19.1 513 50 20.7 22.2 23.8 25.3 26.9 28.4 30.0 31.5 33.1 34.6 514 50 36.2 37.7 39.3 40.8 42.4 43.9 45.5 46.0 48.6 50.1 515 50 51.7 53.2 54.8 56.3 57.9 59.4 61.0 62.5 64.1 65.6 516 50 67.2 68.7 70.3 71.8 73.4 74.9 76.4 78.0 79.5 81.1 517 50 82.6 84.1 85.7 87.2 88.7 90.2 91.8 93.3 94.8 96.4 518 50 97.9 99.4 518 51 01.0 02.5 04.1 05.6 07.1 08.7 10.2 11.8 519 51 13.3 14.8 16.4 17.9 19.4 20.9 22.5 24.0 25.5 27.1 520 51 28.6 30.1 31.7 33.2 34.7 36.2 37.8 39.3 40.8 42.4 521 51 43.9 45.4 47.0 48.5 50.0 51.5 53.1 54.6 56.1 57.7 522 51 59.2 60.7 62.2 63.8 65.3 66.8 68.3 69.8 71.4 72.9 523 51 74.4 75.9 77.5 79.0 80.5 82.0 83.6 85.1 86.6 88.2 524 51 89.7 91.2 92.7 94.3 95.8 97.3 98.8 Barom- Parts eter Horh. N. 0.0 O.I 0.2 O.3 0.4 O.5 O.6 O.7 0.8 O.9 'or eac O.Olmn 22 BAROMETRICAL MEASUREMENT OF HEIGHTS. DELCROS. 524 to 565mm-. Barom- eter Horh. Milli. N. Metr. o.o O.I O.2 0.3 0.4 O.5 0.6 0.7 O.S 0.9 Parts for each 0.01 mm. Metres. Metres. Metres. Metres. Metres Metres. Metres. Metres. Metres. Metres. Metr. 524 52 00.3 01.9 03.4 525 52 04.9 06.4 07.9 09.4 10.9 12.4 14.0 15.5 17.0 18.5 526 52 20.0 21.5 23.0 24.5 26.0 27.5 29.1 30.6 32.1 33.6 527 52 35.1 36.6 38.1 39.6 41.1 42.6 44.2 45.7 47.2 48.7 528 52 50.2 51.7 53.2 54.7 56.2 57.7 59.3 60.8 62.3 63.8 529 52 65.3 66.8 68.3 69.8 71.3 72.8 74.3 75.8 77.3 78.8 1 0.1 530 52 80.3 .81.8 83.3 84.8 86.3 87.8 89.3 90.8 92.3 93.8 2 0.3 531 52 95.3 96.8 98.3 99.8 3 0.4 531 53 01.3 02.8 04.3 05.8 07.3 08.8 4 0.6 532 53 10.3 11.8 13.3 14.8 16.3 17.8 19.3 20.8 22,3 23.8 5 0.7 533 53 25.3 26.8 28.3 29.8 31.3 32.7 34.2 35.7 37.2 38.7 6 0.9 534 53 40.2 41.7 43.2 44.7 46.2 47.6 49.1 50.6 52.1 53.6 7 1.0 535 53 55.1 56.5 58.1 59.6 61.1 62.5 64.0 65.5 67.0 68.5 8 1.2 536 53 70.0 71.5 73.0 74.4 75.9 77.4 78.9 80.4 81.8 83.3 9 1.3 537 53 84.8 86.3 87.8 89.2 90.7 92.2 93.7 95.2 96.6 98.1 538 53 99.6 538 54 01.1 02.6 04.0 05.5 07.0 08.5 10.0 11.4 12.9 539 54 14.4 15.9 17.4 18.8 20.3 21.8 23.3 24.8 26.2 27.7 540 54 29.2 30.7 32.1 33.6 35.1 36.5 38.0 39.5 41.0 42.4 541 54 43.9 45.4 46.8 48.3 49.8 51.2 52.7 54.2 55.7 57.1 542 54 58.6 60.1 61.5 63-0 64.5 66.0 67.4 68.9 70.4 71.8 543 54 73.3 74.8 76.2 77.7 79.1 80.6 82.1 83.5 85.0 86.4 544 54 87.9 89.4 90.8 92.3 93.7 95.2 96.7 98.1 99.6 544 55 01.0 545 55 02.5 04.0 05.4 06.9 08.4 09.8 11.3 12.8 14.3 15.7 546 55 17.2 18.7 20.1 21.6 23.0 24.5 26.0 27.4 28.9 30.3 547 55 31.8 33.3 34.7 36.1 37.6 39.0 40.5 41.9 43.4 44.8 548 55 46.3 47.7 49.2 50.6 52.1 53.5 55.0 56.4 57.9 59.3 549 55 60.8 62.2 63.7 65.1 66.6 68.0 69.5 70.9 72.4 73.8 550 55 75.3 76.7 78.2 79.6 81.1 82.5 84.0 85.4 86.9 88.3 551 55 89.8 91.2 92.7 94.1 95.6 97.0 98.4 99.9 551 56 01.3 02.8 1 0.1 552 56 04.2 05.6 07.1 08.5 10.0 11.4 12.8 14.3 15.7 17.2 2 0.3 553 56 18.6 20.0 21.5 22.9 24.4 25.8 27.2 28.7 30.1 31.6 3 0.4 554 56 33.0 34.4 35.9 37.3 38.8 40.2 41.6 43.1 44.5 46.0 4 0.6 555 56 47.4 48.8 50.3 51.7 53.1 54.5 56.0 57.4 58.8 60.3 5 0.7' 556 56 61.7 63.1 64.6 66.0 67.4 68.8 70.3 71.7 73.1 74.6 (5 0.9 557 56 76.0 77.4 78.9 80.3 81.7 83.1 84.6 86.0 87.4 88.9 7 1.0 558 57 90.3 91.7 93.2 94.6 96.0 97.4 98.9 8 1.2 558 57 00.3 01.7 03.2 9 1.3 559 57 04.6 06.0 07.4 08.9 10.3 11.7 13.1 14.5 16.0 17.4 560 57 18.8 20.2 21.6 23.1 24.5 25.9 27.3 28-7 30.2 31.6 561 57 33.0 34.4 35.8 37.3 38.7 40.1 41.5 42.9 44.4 45.8 562 57 47.2 48.6 50.0 51.4 52.8 542 55.7 57.1 58.5 59-9 563 57 61.3 62.7 64.1 65.5 66.9 68.3 69.8 71.2 72.6 74.0 564 57 75.4 76.8 78.2 79.6 81.0 82.4 83.9 85.3 86.7 88.1 565 57 89.5 90.9 92.4 93.8 95.2 96.6 98.0 99.4 Barom- eter Horh N. O.O 0.1 0.2 O.3 0.4 0.5 0.0 0.7 0.8 O.9 Parts for each 0.01 mm. D 23 BAROMETRICAL MEASUREMENT OF HEIGHTS- DELCROS. 565 to 6O5mm . Birom- eter Horh. N. 0.0 0.1 O.2 O.3 0.4 0.5 0.6 0.7 0.8 0.9 Parts for each 0.01mm. Milli. Metr Metres Metres. Metres Metres Metres Metres. Metres. Metres. Metres Metres Metr. 565 58 00.8 02.2 566 58 03.6 05.0 06.4 07.8 09.2 10.6 12. 13.5 14.9 16.3 567 58 17.7 19.1 20.5 21.9 23.3 24.7 26. 27.5 28.9 30.3 568 58 31.7 33.1 34.5 35.9 37.3 38.7 40. 41.5 42.9 44.3 569 58 45.7 47.1 48.5 49.9 51.3 52.7 54. 55.5 56.9 58.3 570 58 59.7 61.1 62.5 63.9 65.3 66.7 68. 69.5 70.9 72.3 571 58 73.7 75.1 76.5 77.9 79.3 80.6 82.0 83.4 84.8 86.2 572 58 87.6 89.0 90.4 91.8 93.2 94.5 95.9 97.3 98.7 572 59 00.1 573 59 01.5 02.9 04.3 05.7 07.1 08.4 09.8 11.2 12.6 14.0 574 59 15.4 16.8 18.2 19.6 21.0 22.3 23.7 25.1 26.5 27.9 575 59 29.3 30.7 32.1 33.4 34.8 36.2 37.6 39.0 40.3 41.7 576 59 43.1 44.5 45.9 47.2 48.6 50.0 51.4 52.8 54.1 55.5 1 0.1 577 59 56.9 58.3 59.7 61.0 62.4 63.8 65.2 66.6 67.9 69.3 2 0.3 578 59 70.7 72.1 73.5 74.8 76.2 77.6 79.0 80.4 81.7 83.1 3 0.4 579 59 84.5 85.9 87.2 88.6 90.0 91.3 92.7 94.1 95.5 96.8 4 0.5 580 59 98.2 99.6 5 0.7 580 60 00.9 02.3 03.7 05.0 06.4 07.8 09.2 10.5 6 0.8 581 60 11.9 13.3 14.6 16.0 17.4 18.7 20.1 21.5 22.9 24.2 7 1.0 582 60 25.6 27.0 28.3 29.7 31.1 32.4 33.8 35.2 36.6 37.9 8 1.1 583 60 39.3 40.7 42.0 43.4 44.7 46.1 47.5 48.8 50.2 51.5 911.2 584 60 52.9 54.3 55.6 57.0 58.4 59.7 61.1 62.5 63.9 65.2 585 60 66.6 68.0 69.3 70.7 72.0 73.4 74.8 76.1 77.5 78.8 586 60 80.2 81.6 82.9 84.3 85.6 87.0 88.4 89.7 91.1 92.4 587 60 93.8 95.1 96.5 97.8 99.2 587 61 00.5 01.9 03.2 04.6 05.9 588 61 07.3 08.6 10.0 11.3 12.7 14.0 15.4 16.7 18.1 19.4 589 61 20.8 22.1 23.5 24.8 26.2 27.5 28.9 30.2 31.6 32.9 590 61 34.3 35.6 37.0 38.3 39.7 41.0 42.4 43.7 45.1 46.4 591 61 47.8 49.1 50.5 51.8 53.2 54.5 55.9 57.2 58.6 59.9 592 61 61.3 62.6 64.0 65.3 66.7 68.0 69.3 70.7 72.0 73.4 593 61 74.7 76.0 77.4 78.7 80.1 81.4 82.7 84.1 85.4 86.8 594 61 88.1 89.4 90.8 92.1 93.5 94.8 96.1 97.5 98.8 594 62 00.2 595 62 01.5 02.8 04.2 05.5 06.9 08.2 09.5 10.9 12.2 13.6 596 62 14.9 16.2 17.6 18.9 20.2 21.5 22.9 24.2 25.5 26.9 597 62 28.2 29.5 30.9 32.2 33.6 34.9 36.2 37.6 38.9 40.3 598 62 41.6 42.9 44.3 45.6 46.9 48.2 49.6 50.9 52.2 53.6 599 62 54.9 56.2 57.6 58.9 60.2 61.5 62.9 64.2 65.5 66.9 600 62 68.2 69.5 70.8 72.2 73.5 74.8 76.1 77.4 78.8 80.1 601 62 81.4 82.7 84.1 85.4 86.7 88.0 89.4 90.7 92.0 93.4 602 62 94.7 96.0 97.3 98.7 602 63 00.0 01.3 02.6 03.9 05.3 06.6 C03 63 07.9 09.2 10.5 11.9 13.2 14.5 15.8 17.1 18.5 19.8 604 63 21.1 22.4 23.7 25.1 26.4 27.7 29.0 30.3 31.7 33.0 605 63 34.3 35.6 36.9 38.2 39.5 40.8 42.2 43.5 44.8 46.1 3arom- eier Horh. N. o.o 0.1 0.2 0.3 0.4 0.5 O.6 0.7 O.8 0.9 Parts or each .Olmm. 24 BAROMETRICAL MEASUREMENT OF HEIGHTS. DELCROS. 606 to 647mm-. Barom- eter Horh. N. o.o 0.1 0.2 0.3 O.4 O.5 0.6 0.7 O.8 O.9 Parts for each O.Olmrn. Mi Hi. Metr. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metr. 606 63 47.4 48.7 50.0 51.3 52.6 53.9 55.3 56.6 57.9 59.2 607 63 60.5 61.8 63.1 64.5 65.8 67.1 68.4 69.7 71.1 72.4 608 63 73.7 75.0 76-3 77.6 78.9 80.2 81.5 82-8 84.1 85.4 609 63 86.7 88.0 89.3 90.6 91.9 93.2 94.6 95.9 97.2 98.5 610 63 99.8 610 64 01.1 02.4 03.7 05.0 063 07.6 08.9 10.2 11.5 611 64 12.8 14.1 15.4 16.7 18.0 19.3 20.7 22.0 23.3 24.6 612 64 25.9 27.2 28.5 29.8 31.1 32.4 33.7 35.0 36.3 37.6 613 64 38.9 40.2 41.5 42.8 44.1 45.4 46.7 48.0 49.3 50.6 614 64 51.9 53.2 54.5 55.8 57.1 58.3 59.6 60.9 62.2 63.5 615 64 64.8 66.1 67.4 68.7 70.0 71.2 72.5 73.8 75.1 76.4 616 64 77.7 79.0 80.3 81.6 82.9 84.2 85.5 86.8 88.1 89.4 •617 64 90.7 92.0 93.3 94.6 95.9 97.1 98.4 99.7 617 65 01.0 02.3 618 65 03.6 04.9 06.2 07.4 08.7 10.0 11.3 12.6 13.8 15.1 619 65 16.4 17.7 19.0 20.3 21.6 22.8 24.1 25.4 26.7 28.0 620 65 29.3 30.6 31.9 33.1 34.4 35.7 37.0 38.3 39.5 40.8 621 65 42.1 43.4 44.7 45.9 47.2 48.5 49.8 51.1 52.3 53.6 1 0.1 622 65 54.9 56.2 57.5 58.7 60.0 61.3 62.6 63.9 65.1 66.4 2 0.2 623 65 67.7 69.0 70.3 71.5 72.8 74.1 75.4 76.7 77.9 79.2 3 0.4 624 65 80.5 81.8 83.0 84.3 85.6 86.8 88.1 89.4 90.7 91.9 4 0.5 5 0.6 625 65 93.2 94.5 95.8 97.0 98.3 99.6 6 0.8 625 66 00.9 02.2 03.4 04.7 7 0.9 626 66 06.0 07.3 08.5 09.8 11.1 12.3 13.6 14.9 16.2 17.4 8 1.0 627 66 18.7 20.0 21.2 22.5 23.8 25.0 26.3 27.6 28.9 30.1 9 1.1 628 66 31.4 32.7 33.9 36.2 56.4 37.7 39.0 40.2 41.5 42.7 629 66 44.0 45.3 46.5 47.8 49.1 50.3 51.6 52.9 54.2 55.4 630 66 56.7 58.0 59.2 60.5 61.7 63.0 64.3 65.5 66.8 68.0 631 66 69.3 70.6 71.8 73.1 74.4 75.6 76.9 78.2 79.5 80.7 632 66 82.0 83.2 84.5 85.7 87.0 88.2 89.5 90.7 92.0 93.2 633 66 94.5 95.8 97.0 98.3 99.5 633 67 00.8 02.1 03.3 04.6 05.8 634 67 07.1 08.4 09.6 10.9 12.1 13.4 14.7 15.9 17.2 18.4 635 67 19.7 20.9 22.2 23.4 24.7 25.9 27.2 28.4 29.7 30.9 636 67 32.2 33.4 34.7 35.9 37.2 38.4 39.7 40.9 42.2 43.4 637 67 44.7 45.9 47.2 48.4 49.7 50.9 52.2 53.4 54.7 55.9 638 67 57.2 58.4 59.7 60.9 62.2 63.4 64.7 65.9 67.2 68.4 639 67 69.7 70.9 72.2 73.4 74.7 75.9 77.1 78.4 79.6 80.9 640 67 82.1 83.3 84.6 85.8 87.1 88.3 89.6 90.8 92.1 93.3 641 67 94.6 95.8 97.1 98.3 99.6 641 68 4)0.8 02.0 03.3 04.5 05.8 642 68 07.0 08.2 09.5 10.7 12.0 13.2 14.4 15.7 16.9 18.2 643 68 19.4 20.6 21.9 23.1 24.3 25.5 26.8 28.0 29.2 30.5 644 68 31.7 32.9 34.2 35.4 36.7 37.9 39.1 40.4 41.6 42.9 645 68 44.1 45.3 46.6 47.8 49.0 50.2 51.5 52.7 53.9 55.2 646 68 56.4 57.6 58.9 60.1 61.3 62.5 63.8 65.0 66.2 67.5 647 68 68. 7 69.9 71.2 72.4 73.6 74.8 76.1 77.3 78.5 79.8 Barom- eter Horh. N. 0.0 O.I 0.2 0.3 0.4 O.5 O.6 0.7 O.8 0.9 Parts or each .Olmm 1) 25 10 BAROMETRICAL MEASUREMENT OF HEIGHTS. DELCROS. 648 to 6S9mm-. Barom- eter Horh. N. 0.0 0.1 0.2 0.3 0.4 O.5 O.6 0.7 0.8 0.9 Parta for each 0.01mm ! Milli. Melr. Metres. Metres Metres. Metres. Metres Metres. Metres. Metres. Metres. Metres. Metr. 648 68 81.0 82.2 83.5 84.7 85.9 87.1 88.4 89.6 90.8 92.1 649 68 93.3 94.5 95.8 97.0 98.2 99.4 649 69 00.7 01.9 03.1 04.4 650 69 05.6 06.8 08.0 09.3 10.5 11.7 12.9 14.1 15.4 16.6 651 69 17.8 19.0 20.2 21.5 22.7 23.9 25.1 26.3 27.6 28.8 652 69 30.0 31.2 32.4 33.7 34.9 36.1 37.3 38.5 39.8 41.0 653 69 42.2 43.4 44.6 45.9 47.1 48.3 49.5 50.7 52.0 53.2 654 69 54.4 55.6 56.8 58.1 59.3 60.5 61.7 62.9 64.2 65.4 655 69 66.6 67.8 69.0 70.2 71.4 72.6 73.9 75.1 76.3 77.5 656 69 78.7 79.9 81.1 82.4 83.6 84.8 86.0 87.2 88.5 89.7 657 69 90.9 92.1 93.3 94.5 95.7 96.9 98.2 99.4 657 70 00.6 01.8 658 70 03.0 04.2 05.4 06.6 07.8 09.0 10.3 11.5 12.7 13.9 659 70 15.1 16.8 17.5 18.7 19.9 21.1 22.4 23.6 24.8 26.0 660 70 27.2 28.4 29.6 30.8 32.0 33.2 34.4 35.6 36.8 38.0 1 0.1 661 70 39.2 40.4 41.6 42.8 44.0 45.2 46.4 47.6 48.8 50.0 2 0.2 662 70 51.2 52.4 53.6 54.8 56.0 57.2 58.5 59.7 60.9 62.1 3 0.4 663 70 63.3 64.5 65.7 66.9 68.1 69.3 70.5 71.7 72.9 74.1 4 0.5 664 70 75.3 76.5 77.7 78.9 80.1 81.2 82.4 83.6 84.8 86.0 5 0.6 665 70 87.2 88.4 89.6 90.8 92.0 93.2 94.4 95.6 96.8 98.0 6 0.7 666 70 99.2 7 0.8 666 71 00.4 01.6 02.8 04.0 05.2 06.4 07.6 08.8 10.0 8 1.0 667 71 11.2 12.4 13.6 14.8 16.0 17.1 18.3 19.5 20.7 21.9 9 1.1 668 71 23.1 24.3 25.5 26.7 27.9 29.0 30.2 31.4 32.6 33.8 669 71 35.0 36.2 37.4 38.6 39.8 40.9 42.1 43.3 44.5 45.7 670 71 46.9 48.1 49.3 50.5 51.7 52.8 54.0 55.2 56.4 57.6 671 71 58.8 60.0 61.2 62.3 63.5 64.7 65.9 67.1 68.2 69.4 672 71 70.6 71.8 73.0 74.2 75.4 76.5 77.7 78.9 80.1 81.3 673 71 82.5 83.7 84.9 86.0 87.2 88.4 89.6 90.8 91.9 93.1 674 71 94.3 95.5 96.7 97.8 99.0 674 72 00.2 01.4 02.6 03.7 04.9 675 72 06.1 07.3 08.5 09.6 10.8 12.0 13.2 14.4 15.5 16.7 676 72 17.9 19.1 20.3 21.4 22.6 23.8 25.0 26.2 27.3 28.5 677 72 29.7 30.9 32.0 33.2 34.4 35.5 36.7 37.9 39.1 40.2 678 72 41.4 42.6 43.8 44.9 46.1 47.3 48.5 49.7 50.8 52.0 679 72 53.2 54.4 55.5 56.7 57.9 59.0 60.2 61.4 62.6 63.7 680 72 64.9 66.1 67.2 68.4 69.6 70.7 71.9 73.1 74.3 75.4 681 72 76.6 77.8 78.9 80.1 81.3 82.4 83.6 84.8 86.0 87.1 1 j 0.1 682 72 88.3 89.5 90.6 91.8 93.0 94.1 95.3 96.5 97.7 98.8 2 0.2 683 73 00.0 01.2 02.3 03.5 04.6 05.8 07.0 08.1 09.3 10.4 3 0.3 684 73 11.6 12.8 13.9 15.1 16.2 17.4 18.6 19.7 20.9 22.0 4 0.5 685 73 23.2 24.4 25.5 26-7 27.8 29.0 30.2 31.3 32.5 33.6 5 0.6 686 73 34.8 36.0 37.1 38.3 39.4 40.6 41.8 42.9 44.1 45.2 6 0.7 687 73 46.4 47.6 48.7 49.9 51.0 52.2 53.4 54.5 55.7 56.8 7 0.8 688 73 58.0 59.2 60.3 61.5 62.6 63.8 65.0 66.1 67.3 68.4 8 0.9 689 73 69.6 70.7 71.9 73.0 74.2 75.3 76.5 77.6 78.8 79.9 9 1.1 Barom- eter Horh. N. 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 O.8 0.9 Parts or each 0.01mm. 26 BAROMETRICAL MEASUREMENT OF HEIGHTS. DELCROS. 11 690 to 730mra-. ! Barom- eter Horh. Milli. N. 0.0 O.I O.2 0.3 0.4 0.5 O.6 O.7 0.8 0.9 Parts for each 0.01mm. Metr. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metr. 690 73 81.1 82.3 83.4 84.6 85.7 86.9 88.1 89.2 90.4 91.5 691 73 92.7 93.8 95.0 96.1 97.3 98.4 99.6 691 74 00.7 01.9 03.0 j 692 74 04.2 05.3 06.5 07.6 08.8 09.9 11.1 12.2 13.4 14.5 693 74 15.7 16.8 18.0 19.1 20.3 21.4 22.6 23.7 24.9 26.0 694 74 27.2 28.3 29.5 30.6 31.8 32.9 34.1 35.2 36.4 37.5 695 74 38.7 39.8 41.0 42.1 43.3 44.4 45.5 46.7 47.8 49.0 696 74 50.1 51.2 52.4 53.5 54.7 55.8 56.9 58.1 59.2 60.4 697 74 61.5 62.6 63.8 64.9 66.1 67.2 68.3 69.5 70.6 71.8 698 74 72.9 74.0 75.2 76.3 77.5 78.6 79.7 80.9 82.0 83.2 699 j 74 84.3 85.4 86.6 87.7 88.9 90.0 91.1 92.3 93.4 94.6 700 74 95.7 96.8 98.0 99.1 700 75 00.3 01.4 02.5 03.7 04.8 06.0 701 75 07.1 08.2 09.4 10.5 11.6 12.7 13.9 15.0 16.1 17.3 702 75 18.4 19.5 20.7 21.8 23.0 24.1 25.2 26.4 27.5 28.7 703 75 29.8 30.9 32.1 33.2 34.3 35.4 36.6 37.7 38.8 40.0 704 75 41.1 42.2 43.4 44.5 45.6 46.7 47.9 49.0 50.1 51.3 705 75 52.4 53.5 54.7 55.8 56.9 58.0 59.2 60.3 61.4 62.6 706 75 63.7 64.8 66.0 67-1 68.2 69.3 70.5 71.6 72.7 73.9 707 75 75.0 76.1 77.2 78.4 79.5 80.6 81.7 82.8 84.0 85.1 708 75 86.2 87.3 88.5 89.6 90.7 91.8 93.0 94.1 95.2 96.4 709 75 97.5 98.6 99.7 709 76 00.9 02.0 03.1 04.2 05.3 06.5 07.6 710 76 08.7 09.8 10.9 12.1 13.2 14.3 15.4 16.5 17.7 18.8 | 711 76 19.9 21.0 22.1 23.3 24.4 25.5 26.6 27.7 28.9 30.0 712 76 31.1 32.2 33.3 34.4 35.5 36.6 37.8 38.9 40.0 41.1 1-0.1 713 76 42.2 43.3 44.4 45.6 46.7 47.8 48.9 50.0 51.2 52.3 2 0.2 714 76 53.4 54.5 55.6 56.8 57.9 59.0 60.1 61.2 62.4 63.5 3 0.3 715 76 64.6 65.7 66.8 67.9 69.0 70.1 71.3 72.4 73.5 74.6 4 0.4 716 76 75.7 76.8 77.9 79.0 80.1 81.2 82.4 83.5 84.6 85.7 5 0.5 717 76 86.8 87.9 89.0 90.1 91.2 92.3 93.5 94.6 95.7 96.8 6 0.7 718 76 97.9 99.0 7 0.8 718 77 00.1 01.2 02.3 03.4 04.6 05.7 06.8 07.9 8 0.9 719 77 09.0 10.1 11.2 12.3 13.4 14.5 15.7 16.8 17.9 19.0 9 1.0 720 77 20.1 21.2 22.3 23.4 24.5 25.6 26.7 27.8 28.9 30.0 721 77 31.1 32.2 33.3 34.4 35.5 36.6 37.7 38.8 39.9 41.0 722 77 42.1 43.2 44.3 45.4 46.5 47.6 48.7 49.8 50.9 52.0 723 77 53.1 54.2 55.3 56.4 57.5 58.6 59.8 60.9 62.0 63.1 724 77 64.2 65.3 66.4 67.5 68.6 69.6 70.7 71.8 72.9 74.0 725 77 75.1 76.2 77.3 78.4 79.5 80.6 81.7 82.8 83.9 S5.0 726 77 86.1 87.2 88.3 89.4 90.5 91.6 92.7 93.8 94.9 96.0 727 77 97.1 98.2 99.3 727 78 00.4 01.5 02.5 03.6 04.7 05.8 06.9 728 78 08.0 09.1 10.2 11.3 12.4 13 5 14.6 15.7 16.8 17-9 729 78 19.0 20.1 21.2 22.3 23.4 24.4 25.5 26.6 27.7 28.8 730 78 29.9 31,0 32.1 33.3 34.3 35.3 36.4 37.5 38.6 39.7 Barom- eter Horh. N. o.o 0.1 O.2 0.3 O.4 0.5 0.6 O.7 O.8 0.9 Parts for each 001mm. 1J 27 12 BAROMETRICAL MEASUREMENT OF HEIGHTS. DELCROS. 731 to 77Omra\ Barom- Parts eter Horh. N. 0.0 0.1 O.2 0.3 0.4 O.5 0.6 0.7 0.8 0.9 for eacl 0.01mm. Milli. Metr Metres. Metres. Metres. Metres. Metres Metres. Metres. Metres. Metres. Metres Metr. 731 78 40.8 41.9 43.0 44.1 45.2 46.2 47.3 48.4 49.5 50.6 732 78 51.7 52.8 53.9 54.9 56.0 57.0 58.2 59.3 60.3 61.4 733 78 62.5 63.6 64.7 65.8 66.9 67.9 69.0 70.1 71.2 72.3 1 734 78 73.4 74.5 75.6 76.6 77.7 78.8 79.9 81.0 82.0 83.1 | 735 78 84.2 85.3 86.4 87.5 88.6 89.6 90.7 91.8 92.9 94.0 736 78 95.1 96.2 97.3 98.3 99.4 736 79 00.5 01.6 02.7 03.7 04.8 737 79 05.9 07.0 08.1 09.1 10.2 11.3 12.4 13.5 14.5 15.6 738 79 16.7 17.8 18.9 19.9 21.0 22.1 23.2 24.3 25.3 26.4 739 79 27.5 28.6 29.6 30.7 31.8 32.8 33.9 35.0 36.1 37.1 740 79 38.2 39.3 40.4 41.4 42.5 43.6 44.7 45.8 46.8 47.9 741 79 49.0 50.1 51.1 52.2 53.3 54.3 55.4 56.5 57.6 58.6 742 79 59.7 60.8 61.8 62.9 64.0 65.0 66.1 67.2 68.3 69.3 743 79 70.4 71.5 72.6 73.6 74.7 75.8 76.9 78.0 79.0 80.1 744 79 81.2 82.3 83.3 84.4 85.5 86.5 87.6 88.7 89.8 90.8 745 79 91.9 93.0 94.0 95.1 96.1 97.2 98.3 99.3 745 80 00.4 01.4 746 80 02.5 03.6 04.6 05.7 06.8 07.8 08.9 10.0 11.1 12.3 747 80 13.2 14.3 15.3 16.4 17.4 18.5 19.6 20.6 21.7 22.7 748 80 23.8 24.9 25.9 27.0 28.0 29.1 30.2 31.2 32.3 33.3 749 80 34.4 35.5 36.5 37.6 38.7 39.7 40.8 41.9 43.0 44.0 750 80 45.1 46.2 47.3 48.4 49.4 50.5 51.6 52.6 53.7 54.7 751 80 55.7 56.8 57.8 58.9 59.9 61.0 62.1 63.1 64.2 65.2 752 80 66.3 67.4 68.4 69.5 70.5 71.6 72.7 73.7 74.8 75.8 753 80 76.9 78.0 79.0 80.1 81.1 82.2 83.3 84.3 85.4 86.4 754 80 87.5 88.5 89.6 90.6 91.7 92.7 93.8 94.8 95.9 96.9 1 0.1 755 80 98.0 99.1 2 0.2 755 81 00.1 01.2 02.2 03.3 04.4 05.4 06.5 07.5 3 0.3 756 81 08.6 09.6 10.7 11.7 12.8 13.8 14.9 15.9 17.0 18.0 4 0.4 757 81 19.1 20.1 21.2 22.2 23.3 24.3 25.4 26.4 27.5 28.5 5 0.5 758 81 29.6 30.6 31.7 32.7 33.8 34.8 35.9 36.9 38.0 39.0 6 0.6 759 81 40.1 41.1 42.2 43.2 44.3 45.3 46.4 47.4 48.5 49.5 7 0.7 8 0.8 760 81 50.6 51.6 52.7 53.7 54.8 55.8 56.9 57.9 59.0 60.0 9 0.9 761 81 61.1 62.1 63.2 64.2 65.3 66.3 67.3 68.4 69.4 70.5 762 81 71.5 72.5 73.6 74.6 75.7 76.7 77.8 78.8 79.9 80.9 763 81 82.0 83.0 84.1 85.1 86.2 87.2 88.2 89.3 90.3 91.4 764 81 92.4 93.4 94.5 95.5 96.6 97.6 98.6 99.7 764 82 00.7 01.8 765 82 02.8 03.8 04.9 05.9 07.0 08.0 09.0 10.1 11.1 12.2 766 82 13.2 14.2 15.3 16.3 17.4 18.4 19.4 20.5 21.5 22.6 767 82 23.6 24.6 25.7 26.7 27.8 28.8 29.8 30.9 31.9 33.0 768 82 34.0 35.0 36.1 37.1 38.2 39.2 40.2 41.3 42.3 43.4 769 82 44.4 45.4 46.5 47.5 48.5 49.5 50.6 51.6 52.6 53.7 770 82 54.7 55.7 56.8 57.8 58.8 59.8 60.9 61.0 62.9 64.0 Barom- eter Horh. N. 0.0 0.1 0.2 O.3 0.4 O.5 O.6 0.7 O.8 O.9 Parts or each .Olmm. 28 BAROMETRICAL MEASUREMENT OF HEIGHTS. DELCROS. Id 771 to 810"""-. \£L- '^^ | Barom- Parts | eter Horh. N. o.o 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 for each 0.01mm. mil. Metr. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metr. 771 82 65.0 66.0 67.1 68.1 69.2 70.2 71.2 72.3 73.3 74.4 772 82 75.4 76.4 77.5 78.5 79.5 80.5 81.6 82.6 83.6 84.7 773 82 85.7 86.7 87.8 88.8 89.8 90.8 91.9 92.9 93.9 95.0 774 82 96.0 97.0 98.0 99.1 i 774 83 00.1 01.1 02.1 03.1 04.2 05.2 775 83 06.2 07.2 08.3 09.3 10.3 11.3 12.4 13.4 14.4 15.5 776 83 16.5 17.5 18.5 19.6 20.6 21.6 22.6 23.6 24.7 25.7 777 83 26.7 27.7 28.8 29.8 30.8 31.8 32.9 33.9 34.9 36.0 778 83 37.0 38.0 39.0 40.1 41.1 42.1 43.1 44.1 45.2 46.2 779 83 47.2 48.2 49.2 50.3 51.3 52.3 53.3 54.3 55.4 56.4 780 83 57.4 58.4 59.4 60.5 61.5 62.5 63.5 64.5 65.6 66.6 781 83 67.6 68.6 69.6 70.7 71.7 72.7 73.7 74.7 75.8 76.8 782 83 77.8 78.8 79.8 80.9 81.9 82.9 83.9 84.9 86.0 87.0 783 83 88.0 89.0 90.0 91.1 92.1 93.1 94.1 95.1 96.2 97.2 784 83 98.2 99.2 784 84 00.2 01.2 02.2 03.2 04.3 05.3 06.3 07.3 785 84 08.3 09.3 10.3 11.4 12.4 13.4 14.4 15.4 16.5 17.5 786 84 18.5 19.5 20.5 21.5 22.5 23.5 24.6 25.6 26.6 27.6 787 84 28.6 29.6 30.6 31.6 32.6 33.6 34.7 35.7 36.7 37.7 788 84 38.7 39.7 40.7 41.7 42.7 43.7 44.8 45.8 46.8 47.8 789 84 48.8 49.8 50.8 51.8 52.8 53.8 54.9 55.9 56.9 57.9 790 84 58.9 59.9 60.9 61.9 62.9 63.9 65.0 66.0 67.0 68.0 ' 791 84 68.9 69.9 70.9 71.9 72.9 73.9 75.0 76.0 77.0 78.0 1 0.1 j 792 84 79.0 80.0 81.0 82.0 83.0 84.0 85.0 86.0 87.0 88.0 2 0.2 793 84 89.0 90.0 91.0 92.0 93.0 94.0 95.1 96.1 97.1 98.1 3 0.3 794 84 99.1 4 0.4 794 85 00.1 01.1 02.1 03. 04.1 05.1 06. 07.1 08.1 5 0.5 795 85 09. 10.1 11.1 12.1 13. 14.1 15.1 16. 17.1 18.1 6 0.6 796 85 19. 20.1 21.1 22.1 23. 24.1 25.1 26. 27.1 28.1 7 0.7 797 85 29. 30.1 81.1 32.1 33. 34.1 35.1 36. 37.1 38.1 8 0.8 798 85 39. 40.1 41.1 42.1 43. 44.1 45.1 46. 47.1 48.1 9 0.9 799 85 49. 50.1 51.1 52.0 53.0 54.1 55.0 56.0 57.0 58.0 800 85 59.0 60.0 61.0 62.0 63.0 64.0 65.0 66.0 67.0 68.0 801 85 69.0 70.0 70.9 71.9 72.9 73.9 74.9 75.9 76.9 77.9 802 85 78.9 79.9 80.9 81.9 82.9 83.9 84.9 85.8 86.8 87.8 803 85 88.8 89.8 90.8 91.8 92.8 93.8 94.8 95.8 96.7 97.7 804 85 98.7 99.7 804 86 00.7 01.7 02.7 03.7 04.7 05.7 06.6 07.6 805 86 08.6 09.6 10.6 11.6 12.6 13.6 14.6 15.5 16.5 17.5 806 86 18.5 19.5 20.5 21.5 22.5 23.4 24.4 25.4 26.4 27.4 807 86 28.4 29.4 30.4 31.3 32.3 33.3 34.3 35.3 36.3 37.3 808 86 38.3 39.2 40.2 41.2 42.2 43.2 44.2 45.1 46.1 47.1 809 86 48.1 49.1 50.1 51.1 52.0 53.0 54.0 55.0 56.0 57.0 810 86 57.9 58.9 59.9 60.9 61.9 62.8 ^63.8 64.8 65.8 66.8 Barom- eter N. O.O 0.1 O.2 0.3 0.4 0.5 0.6 O.7 O.8 O.9 Parts Tor each Horh. 0.01mm. D 29 BAROMETRICAL MEASUREMENT OF HEIGHTS. DELCROS. TABLE II. CORRECTION FOR DIFFERENCE OF TEMPERATURE OF ATTACHED THERMOMETERS. Temperature of Barometers at Station { [JJJJJJ = J T — T Centig. Correct. Metres. T' — T Centigrade. Correct. Metres. T' — T Centigrade. Correct. Metres. T' — T Centigrades Correct. Metres. I7 — T Centigrade. Correct. Metres. 0.0 0.0 8.0 10.3 16.0 20.6 24.0 30.9 32.0 41.3 0.2 0.3 8.2 10.6 16.2 20.9 24.2 31.2 32.2 41.5 0.4 0.5 8.4 10.8 16.4 21.1 24.4 31.5 32.4 41.8 0.6 0.8 8.6 11.1 16.6 21.4 24.6 31.7 32.6 42.0 0.8 1.0 8.8 11.3 16.8 21.7 24.8 32.0 32.8 42.3 .0 1.3 9.0 11.6 17.0 21.9 25.0 32.2 33.0 42.5 .2 1.5 9.2 11.9 17.2 22.2 25.2 32.5 33.2 42.8 .4 1.8 9.4 12.1 17.4 22.4 25.4 32.7 33.4 43.1 .6 2.1 9.6 12.4 17.6 22.7 25.6 33.0 33.6 43.3 . .8 2.3 9.8 12.6 17.8 22.9 25.8 33.3 33.8 43.6 2.0 2.6 10.0 12.9 18.0 23.2 26.0 33.5 34.0 43.8 2.2 2.8 10.2 13.1 18.2 23.5 26.2 33.8 34.2 44.1 2.4 3.1 10.4 13.4 18.4 23.7 26.4 34.0 34.4 44.3 2.6 3.4 10.6 13.7 18.6 24.0 26.6 34.3 34.6 44.6 2.8 3.6 10.8 13.9 18.8 24.2 26.8 34.6 34.8 44.9 3.0 3.9 11.0 14.2 19.0 24.5 27.0 34.8 35.0 45.1 3.2 4.1 11.2 14.5 19.2 24.8 27.2 35.1 35.2 45.4 3.4 4-4 11.4 14.7 19.4 25.0 27.4 35.3 35.4 45.6 3.6 4.6 11.6 15.0 19.6 25.3 27.6 35.6 35.6 45.9 3.8 4.9 11.8 15.2 19.8 25.5 27.8 35.8 35.8 46.2 40 5.2 12.0 15.5 20.0 25.8 28.0 36.1 36.0 46.4 4.2 5.4 12.2 15.8 20.2 26.0 28.2 36.4 36.2 46.7 4.4 5.7 12.4 16.0 20.4 26.3 28.4 36.6 36.4 46.9 4.6 5.9 12.6 16.3 20.6 26.6 28.6 36.9 36.6 47.2 4.8 6.2 12.8 16.5 20.8 26.8 28.8 37.1 36.8 47.4 5.0 6.4 13.0 16.8 21.0 27.1 29.0 37.4 37.0 47.7 5.2 6.7 13.2 17.0 21.2 27.3 29.2 37.6 37.2 48.0 5.4 7.0 13.4 17.3 21.4 27.6 29.4 37.9 37.4 48.2 5.6 7.2 13.6 17.5 21.6 27.8 29.6 38-2 37.6 48.5 58 7.5 13.8 17.8 21.8 28.1 29.8 38.4 37.8 48.7 6.0 7.7 14.0 18.0 22.0 28.4 30.0 38.7 38.0 49.0 6.2 8.0 14.2 18.3 22.2 28.6 30.2 38.9 38.2 49.2 6.4 8.3 14.4 18.5 22.4 28.9 30.4 39.2 38.4 49.5 6.6 8.5 14.6 18.8 22.6 29.1 30.6 39.5 38.6 49.8 6.8 8.8 14.8 19.0 22.8 29.4 30.8 39.7 38.8 50.0 7.0 9.0 15.0 19.3 23.0 29.7 31.0 40.0 39.0 50.3 7.2 9.3 15.2 19.6 23.2 29.9 31.2 40.2 39.2 50.5 7.4 9.5 15.4 198 23.4 30.2 31.4 40.5 39.4 50.8 7.6 9.8 15.6 20.1 23.6 30.4 31.6 40.7 39.6 51.1 7.8 10.1 15.8 20.3 23.8 30.7 31.8 41.0 39.8 51.3 8.0 10.3 16.0 20.6 24.0 30.9 32.0 41.3 40.0 51.6 This Table supposes the scale to be of brass from the top to the cistern. If it were of glass or of wood, the argument T' — T ought to be diminished at the ratio of 54 to 62. In computing by the formula of Laplace, we begin by reducing the barometers to the same temperature by means? of the following formula : H == h' + /*' /?-""— Y Table II. saves this trouble, and gives, in metres, the correction due to the differ- ence of temperature of the barometers. D 30 BAROMETRICAL MEASUREMENT OF HEIGHTS. DELCROS. TABLE III. CORRECTION FOR DECREASE OF GRAVITATION IN LATITUDE. |5 = (0.0028371 cosin. 2 L). (A -f- a + /8). The Argument is the Mean Latitude between the two Stations. LATITUDE. Correction, in metres, for Correction. Added. jSubtr'ct 1000 2000 3000 4000 5000 6000 7000 8000 9000 Q o 0 90 2.8 5.7 8.5 11.3 14.2 17.0 19.9 22.7 25.7 1 89 2.8 5.7 8.5 11.3 14.2 17.0 19.8 22.7 25.6 2 88 2.8 5.7 8.5 11.3 14.1 17.0 19.8 22.6 25.5 3 87 2.8 5.6 8.5 11.3 14.1 16.9 19.7 22.6 25.4 4 86 2.8 5.6 8.4 11.2 14.0 16.9 19.7 22.5 25.3 5 85 2.8 5.6 8.4 11.2 14.0 16.8 19.6 22.3 25.1 6 84 2.8 5.5 8.3 11.1 13.9 16.6 19.4 22.2 25.0 7 83 2.7 5.5 8.2 11.0 13.8 16.5 19.3 22.0 24.8 8 , 82 2.7 5.4 8.2 10.9 13.6 16.4 19.1 21.8 24.5 9 81 2.7 5.4 8.1 10.8 13.5 16.2 18.9 21.6 24.3 10 80 2.7 5.3 8.0 10.7 13.3 16.0 18.7 21.3 24.0 11 79 2.6 5.2 7.9 10.5 13.1 15.8 18.4 21.0 23.7 12 78 2.6 5.2 7.8 10.4 13.0 15.5 18.1 20.7 23,3 13 77 2.5 5.1 7.6 10.2 12.7 15.3 17.8 20.4 22.9 14 76 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 22.5 15 75 2.5 4.9 7.4 9.8 12.3 14.7 17.2 19.7 22.1 16 74 2.4 4.8 7.2 9.6 12.0 14.4 16.8 19.2 21.6 17 73 2.4 4.7 7.0 9.4 11.8 14.1 16.5 18.8 21.2 18 72 2.3 4.6 6.9 9.2 11.5 13.8 16.1 18.4 20.7 19 71 2.2 •4.5 6.7 8.9 11.2 13.4 15.6 17.9 20.1 20 70 2.2 4.3 6.5 8.7 10.9 13.0 15.2 17-4 19.6 21 69 2.1 4.2 6.3 8.4 10.5 12.6 14.7 16.9 19.0 22 68 2.0 4.1 6.1 8.2 10.2 12.2 14.3 16.3 18.4 23 67 2.0 3.9 5.9 7.9 9.8 11.8 13.8 15.8 17.7 24 66 1.9 3.8 5.7 7.6 9.5 11.4 13.3 15.2 17-1 25 65 1.8 3.6 5.5 7.3 9.1 10.9 12.8 14.6 16.4 26 64 1.7 3.5 5.2 7.0 8.7 10.5 12.2 14.0 15.7 27 63 .7 3.3 5.0 6.7 8.3 10.0 11.7 13.3 15.0 28 62 .6 3.2 4-8 6.3 7.9 9.5 11.1 12.7 14.3 29 61 .5 3.0 4.5 6.0 7.5 9.0 10.5 12.0 13.5 30 60 .4 2.8 4.3 5.7 7.1 8.5 9.9 11.3 12.8 31 59 .3 2.7 4.0 5.3 6.6 8.0 9.3 10.6 12.0 32 58 .2 2.5 3.7 5.0 6.2 7.5 8.7 9.9 11.2 33 57 .1 2.3 3.5 4.6 5.8 6.9 8.1 9.2 10.4 34 56 .1 2.1 3.2 4.2 5.3 6.4 7.4 8.5 9.6 35 55 .0 1.9 2.9 3.9 4.8 5.8 6.8 7.8 8.7 36 54 0.9 1.7 2.6 3.5 4.4 5.3 6.1 7.0 7.9 37 53 0.8 1.6 2.3 3.1 3.9 4.7 5.5 6.2 7.0 38 52 0.7 1.4 2.1 2.7 3.4 4.1 4.8 5.5 6.2 39 51 0.6 1.2 1.8 2.4 2.9 3.5 4.1 4.7 5.3 40 50 0.5 1.0 1.5 2.0 2.5 3.0 3.4 3.9 4.4 41 49 0.4 0-8 1.2 1.6 2.0 2.4 2.8 3.2 3.5 42 48 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 43 47 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 44 46 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 45 45 0.0 0.0 o.o 0.0 0.0 0.0 0.0 0.0 0.0 D 31 BAROMETRICAL MEASUREMENT OF HEIGHTS. DELCKOSl TABLE IV. CORRECTION FOR DECREASE OF GRAVITATION ON A VERTICAL LINE. 8 = ( 6366200 ) X A ( + a -f 0 + »)• Argument = (A -f * -{- & -f u). Approximate Difference of Level. Correspond Correction Positive. Approximate Difference of Level. Correspond. Correction Positive. Approximate Difference of Level. Correspond. Correction Positive. Approximate D (Terence of Level. Correspond. Correction Positive. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. 100 0.2 2100 6.0 4100 12.9 6100 21.1 200 0.5 2200 6.3 4200 13.3 6200 21.6 300 0.8 2300 6.6 4300 13.7 6300 22.0 400 1.0 2400 6.9 4400 14.1 6400 22.5 500 1.3 2500 7.3 4500 14.5 6500 22.9 600 1.6 2600 7.6 4600 14.9 6600 23.4 700 1.8 2700 7.9 4700 15.3 6700 23.9 800 2.1 2800 8.3 4800 15.7 6800 24.3 900 2.4 2900 8.6 4900 16.1 6900 24.8 1000 2.7 3000 8.9 5000 16.5 7000 25.3 1100 2.9 3100 9.3 5100 16.9 7100 25.7 1200 3.2 3200 9.6 5200 17.3 7200 26.2 1300 3.5 3300 10.0 5300 17.7 7300 26.7 1400 3.8 3400 10.3 5400 18 .1 7400 27.2 1500 4.1 3500 10.7 5500 18 .5 7500 27.7 1600 4.4 3600 11.1 5600 19.0 7600 28.1 1700 4.7 3700 11.4 5700 19 .4 7700 28.6 1800 5.0 3800 11.8 5800 19.8 7800 29.1 1900 5.3 3900 12.2 5900 20.3 7900 29.6 2000 6.6 4000 12.5 6000 20.7 8000 30.1 TABLE V. COBBECTION FOB THE ELEVATION OP THE LOWER STATION ABOVE OCEAN. Argument = Height of Barometer at Lower Station. Approximate Difference of LeveL Height of Barometer at Lower Station in Millimetres. 400 450 500 550 600 650 700 750 Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. 1000 1.7 1.4 1.1 0.9 0.6 0.4 0.2 0.0 2000 3.4 2.8 2.2 1.7 1.3 0.8 0.4 0.1 3000 5.1 4.2 3.3 2.6 1.0, 1.3 0.7 0.1 4000 6.8 5.6 4.4 3.4 2.5 1.7 0.9 0.1 5000 8.5 6.9 5.5 4.3 3.1 2.1 1.1 0.1 6000 10.3 8.3 6.7 5.2 3.8 2.5 1.3 0.2 7000 12.0 9.7 7.8 6.0 4.4 2.9 1.5 0.2 8000 13.7 11.1 8.9 6.9 5.0 3.4 1.8 0.2 9000 15.4 12.5 10.0 7.7 5.7 3.8 2.0 0.3 D : II. TABLES FOR COMPUTING DIFFERENCES OF ELEVATION FROM BAROMETRICAL OBSERVATIONS* BY A. GUYOT. TABLES which, like the preceding ones by Delcros, in metrical measures, are sufficiently extensive to save the necessity of interpolations, relieve the computer of most of his trouble, and considerably reduce the chances of error in the computa- tions. They thus render to science itself a real service, by inducing observers to determine a larger number of points, and to secure the accuracy of the results by repeating their observations at the same point in various atmospheric circumstances, both of which they can do without fear of being overwhelmed by the labor of the computation. Similar tables are here offered to the observers who use instruments graduated to English measures. Like those of Delcros, the new tables are based on Laplace's formula, with a slight modification of only one constant. They dispense with the use of logarithms, and give the differences of level corresponding to every thou- sandth of an inch from 12 to 31 inches by means of the simplest arithmetical opera- tions, so that the data being prepared and corrected, the computation of an elevation takes but a few minutes, and is done with scarcely any chance of error. Laplace's formula and constants were adopted for the computation of the tables in preference to others found in the following sets for reasons which a few words will explain. It has been remarked, page 9, that, in consequence of Laplace's constants having been retained in Gauss's, Schmidt's, and Baily's formula, they all give similar re- sults ; but that Bessel's formula differs in separating the correction due to the moist- ure of the air from that due to its temperature, while in Laplace's, and in the for- mula just mentioned, both are united. To introduce a separate correction for the expansion of aqueous vapor is, in the writer's view, a doubtful improvement. The laws of the distribution and transmission of moisture through the atmosphere are too little known, and its amount, especially in mountain regions, is too variable, and depends too much upon local winds and local condensation, to allow a reasonable hope of obtaining the mean humidity of the layer of air between the two stations by means of hygrometrical observations taken at each of them. These doubts are confirmed by the experience of the author and of many other observers, which shows that, on an average, Laplace's method works not only as well as the other, but more uniformly well. At any rate, the gain, if there is any, is not clear enough to compensate for the undesirable complication of the formula. Though the several co-efficients of Laplace's formula need perhaps to be modified according to more recent and probably more accurate determinations of the physical constants on which they depend, as has been proposed by Plantamour, E. Hitter, and lately by the writer himself in a paper read before the American Association for the Advancement of Science at their meeting in Montreal, they have been retained in preparing the following tables, partly because it was found that the errors due to D 33 BAROMETRICAL MEASUREMENT OF HEIGHTS. the various co-efficients nearly compensate each other ; partly on the ground that, until a severe test, by means of actual comparative measurements made for the purpose, has shown the expediency of these modifications, it seemed desirable to adhere to the old constants, and thus to preserve a uniformity in the results with the tables of Oltmans, Delcros, Gauss, Baily, and others, which have already been extensively used. The substitution of the co-efficient 0.00260, expressing, accord- ing to Schmidt's computation (Mathem. und Physic. Geogr., II. p. 202), the variation of gravity in latitude, for the value 0.002837, does not sensibly alter the altitudes obtained. The close agreement of the determinations furnished by Laplace's formula, in barometrical measurements carefully conducted, made in favorable circumstances, and during the warm season, with those obtained from repeated trigonometrical observations, or by the spirit-level, strongly testifies in favor of its general correct- ness. A few striking examples will suffice to show it. The altitude of Mont Blanc, measured by the barometer, by MM. Bravais and Martins, on the 29th of August, 1844, and computed by Delcros, by means of nine corresponding stations situated on all sides of the mountain (see Annuaire Meteoro- logique de France, for 1851, p. 274), was found to be 4810 metres. The altitude of the same point, being the mean of seven of the most elaborate and reliable geodetic measurements, which cost nearly twenty years of labor, is 4809.6 metres. For smaller elevations the formula seems to answer equally well. The barometrical measurement of Mount Washington, in New Hampshire, by the author, on the 8th and 9th of August, 1851, gave, by Delcros's Tables, for the mean of eight observations, taken at different hours of the day, 5466.7 English feet above Gorham, N. H., 6285.7 above high tide, and 6291.7 feet above the mean level of the ocean in Portland harbor. In August, 1852, W. A. Goodwin, Civil Engineer, start- ing from Gorham Railroad Station, found, by the spirit-level, Mount Washington to be 6285.5 feet above mean tide. In September, 1853, Captain T. J. Cram, of the Topographical Engineers, executed, in behalf of the Coast Survey, a careful measure- ment with the spirit-level, on the same line, for the purpose of testing the various methods of measuring altitudes, and found Mount Washington to be 6293 English feet above the mean level of the ocean. In lower latitudes the formula showed equally good results. By a barometrical measurement in July, 1856, the altitude of the highest peak of the Black Mountain, North Carolina, about Lat. 36°, was found by the author to be 6701 English feet; and that of the highest Mountain House 5248 feet. In September, 1857, Major T. C. Turner, Chief Engineer of the Morganton Railroad, ran a line of levels from the same point which was used as the lower station for the barometrical measurement, to the top of the highest peak, and found its altitude to be 6711 English feet, and that of the Mountain House 5246 feet. Other points on the line agreed equally well. Such an agreement, in so considerable elevations, is all that can be desired. These figures show conclusively, that, when the errors which may arise from the great variability of the data furnished by the instruments have been removed by a repetition, in various states of the atmosphere, and by a proper combination of simul- taneous observations at stations not too distant from each other, those which remain and may be attributed to the formula cannot be considerable. But, on the other D 34 BAROMETRICAL MEASUREMENT OF HEIGHTS. hand, we have no right to expect such results from single observations, taken, per- haps, in unsettled weather, without paying any regard to the time of the day at which they were made, to the distance or the non-simultaneity of the corresponding observations, or to other unfavorable circumstances. It is too well known that in such cases large errors may and do actually occur ; but for these the formula ought not to be held responsible. ARRANGEMENT OF THE TABLES. If we call h = the observed height of the barometer ) r = the temperature of the barometer > at the lower static t = the temperature of the air ) h1 = the observed height of the barometer } T' = the temperature of the barometer > at the upper station. ^^J t' = the temperature of the air ) If we make, further, Z = the difference of level between the two barometers ; L = the mean latitude between the two stations ; H= the height of the barometer at the upper station reduced to the tem- perature of the barometer at the lower station ; or, H= h' \l + 0.00008967 (T — r') \ ; The expansion of the mercurial column, measured by a brass scale, for 1° Fahrenheit = 0.00008967 ; The increase of gravity from the equator to the poles = 0.00520048, or 0.00260 to the 45th degree of latitude ; The earth's mean radius — 20,886,860 English feet; Then, Laplace's formula, reduced to English measures, reads as follows : 900 h I Z = log -=j X 60158.6 English feet (1 _[- 0.00260 cos 2 L). 20886860 10443430 Table I. gives, in English feet, the value of log H or h x 60158.6 for every hundredth of an inch, from 12 to 31 inches in the barometer, together with the value of the additional thousandths, in a separate column. These values have been dimin- ished by a constant, which does not alter the difference required. Table II. gives the correction 2.343 feet X (r — T') for the difference of the tem- peratures of the barometers at the two stations, or r — T'. As the temperature at the upper station is generally lower, T — r1 is usually positive, and the correction negative. It becomes positive when the temperature of the upper barometer is higher, and T — T1 negative. When the heights of the barometers have been reduced to the same temperature, or to the freezing point, this table will not be used. z I 52252 Table IV. shows the correction D' - -to be applied to the approximate 20886860 altitude for the decrease of gravity on a vertical acting on the density of the mercurial column. It is always additive. D •«, 35 BAROMETRICAL MEASUREMENT OF HEIGHTS. h Table V. furnishes the small correction f°r the decrease of gravity on a vertical acting on the density of the air ; the height of the barometer h at the lower station representing its approximate altitude. Like the preceding correction, it is always additive. USE OF THE TABLES. In Table I. find first the numbers corresponding to the observed heights of the barometer h and h1. Suppose, for instance, li = 29.345 in.; find in the first column on the left the number 29.3 ; on the same horizontal line, in the column headed .04, is given the number corresponding to 29.34 = 28121.7 ; in the last column but one on the right, we find for .005 = 4.5, or for 29.345 = 28126.2. Take likewise the value of A', and find the difference. If the barometrical heights have not been previously reduced to the same tem- perature, or to the freezing point, apply to the difference the correction found in Table II. opposite the number representing r — r' ; we thus obtain the approximate difference of level, JD. For computing the correction due to the expansion of the air according to its temperature, or D X ( - — ), make the sum of the temperatures, subtract from that sum 64 ; multiply the rest into the approximate difference D, and divide the product by 900. This correction is of the same sign as (t -|- t' — 64). By apply- ing it, we obtain a second approximate difference of level, D1. In Table III., with D1 and the mean latitude of the stations, find the correction fpi variation of gravity in latitude, and add it to D', paying due attention to the sign. In Table IV. with D', and in Table V. with D' and the height of the barometer at j the lower station, take the corrections for the decrease of gravity on a vertical, and add them to the approximate difference of level. The sum thus found is the true difference of level between the two stations, or Z ; by adding the elevation of the lower station above the level of the sea, when known, we obtain the altitude of the upper station. The use of the small table, VI., by means of which approximate differences of level can be obtained by a single multiplication, is explained below, page 90. Example 1. Measurement of Mount Washington, New Hampshire, by A. Guyot, August 8th, 1851, 4 P.M.; the barometer at the lower station being at 825 English feet above the mean level of the sea ; at the upper station at one foot below the summit. The observation gave, Barometer. Attached Thermometer. Temperature of Air. Gorham, h = 29.272 in. T = 70°.70 F. t = 72°.05 F. Mount Washington, h' = 24.030 " r' = 54°.52 F. /' === 50°.54 F. r — r1 = 16° .$8 F. 122°.59 F. — 64° t 4- t1 — 64 — 58°.59 BAROMETRICAL MEASUREMENT OF HEIGHTS. Table I. gives for h — 29.272 inches, " " for h1 = 24.030 " Difference, Table II. gives for r — r' = 28,061.00 22,905.60 5,155.40 — 37.64 Approximate difference of level, D = 5,117.76 — 64) 5118X58.6 ~~~ 900 Second approximate difference, D' = 5,450.95 Table III. gives for D' = 5450 and Lat. 44° . . 0.50 Table IV. gives for D' =• 5450 .... 14.94 Table V. gives for h = 29.27 .... 0.00 Barometer below summit, . . — 1.00 Mount Washington above Gorham, or . . Z = 5,465.39 Barometer at Gorham above sea level . . 825.00 Mount Washington above the sea, or altitude, . . 6,290.39 Eng. ft. Example 2. Measurement of the highest peak of the Black Mountain, in North Carolina, July llth, 1856, by A. Guyot. By observation we have at, Barometer. Attached Thermometer. Mountain House, h = 24.934 in. r = 64°.58 F. Highest Peak, h' = 23.662 « r' = 61°.88 F. Temperature of Air. t = 61°.34 F. t' = 59°.36 F. T — T' = 2°.70 F. 120°.70 F. — 64° Table I. gives for h = 24.934 " " for h' = 23.662 t1 — - 64 = 56°.7 F. . 23,870.4 22,502.4 1,368.0 — 6.3 = 85.8 Difference, . Table II. gives for r — r1 = 2.7 . Approximate difference, D = 1,361.7 D x (t •+- 1' — 64) __ 1362 X 56.7 __ 900 900 Second approximate difference, D' = Table III. gives for D' = 1448 and Lat. 36° Table IV. gives for D' = 1448 .... Table V. gives for D' — 1448 and h — 25 Highest peak above Mountain House, or . Z = 1,453.2 Mountain House above the sea .... 5,248.4 Black Mountain, highest peak above the sea, or altitude, 6,701.6 Eng. ft. 37 BAROMETRICAL MEASUREMENT OF HEIGHTS. GUYOT. 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GITYOT. o p 2 ^ Q H £ « O g cc § gw o o w pT H o ^ O h o & "®Cf'-rO«OC'' iO ia »£5Cvco i>»noQO«5-f qfrJ'-li-if-lp-lO ^^ §1 QOp^»OOO(NkOOJNCOOieO«5OCOl^O-*t^i-H'tQO a X r-li-(i-Hf-Hr-lr-ii-ii-l' 15000 39.7 37.3 30.4 19.9 ( 5.9 0 48.3 23.5 19.1 15.1 11.5 8.3 5.3 2. 5 15000* • 16000 42.4 39.8 32.5 21.2 7.4 0 52.3 25 .1 20.3 16.1 12.3 8.8 5.6 2. 7 16000 ; nooo 45.0 42.3 34.5 22.5 7.8 0 56.4 26.6 21.6 17.1 13.1 9.4 6.0 2. 8 1700& 1 18000 47.7 44.8 36.5 23.8 8.3 0 60.5 28.2 22.9 18.1 13.8 9.9 6.3 3. 0 18000 ' 19000 50.3 47.3 38.6 25.2 * 5.7 0 64.8 29.8 24.1 19.2 14.6 10.5 6.7 3. 2 19000 20000 53.0 49.8 40.6 26.5 9.2 0 69.2 31 3 25.4 20.2 15.4 11.0 7.0 3. 3 20000 21000 55.6 52.3 42.6 27.8 9.7 0 73.6 32.9 26.7 21.2 16.1 11.6 7.4 3. 5 21000 1 22000 58.3 54.8 44.7 29.1 10.1 0 78.2 34.5 28.0 22.2 16.9 12.1 7.7 3.7 22000' 1 23000 60.9 57.3 46.7 30.5 10.6 0 82.9 36.0 29.2 23.2 17.7 12.7 8.1 3. 8 23000 24000 63.6 59.8 48.7 31.8 11.0 0 87.6 37.6 30.5 24.2 18.5 13.2 8.4 4. 0 24000 25000 66.2 62.2 50.7 33.1 11.5 0 92.5 39.1 31.8 25.2 19.2 13.8 8.8 4. 1 25000J D 53 IV. TABLES FOR REDUCING BAROMETRICAL OBSERVATIONS TO THE LEVEL OF THE SEA, OR TO AN^i OTHER LEVEL, AND FOR COMPUTING DIFFERENCES OF ELEVATION MEASURED BY THI BAROMETER, BY M. C. DIPPE. THE following tables, published by M. C. DIPPE, in tbe Astronomische Nachrichten No. 1056, November, 1856, are a modification and extension of Gauss's tables published in Schumacher's Jahrbuch, for 1836 and the following years, which are based on the formula of Laplace. In this new form they answer a double purpose They give the means of solving a problem which often occurs in Meteorology, viz. The difference of elevation between two stations, and the temperature of the air a both, being known, to reduce the height of the barometer at one of the stations to the height it would have at the other. They are likewise adapted to the computation 01 heights from barometrical observations. The formula of Laplace, which has been used, the Metres being reduced to Toises and the Centigrade degrees to degrees of Reaumur, reads as follows : h = 9407.73 Where t and V = the temperatures of the air, in degrees of Reaumur, at the lowei and upper station, b and If = the height of the barometer, in any scale, reduced to the freezing point, at the lower and upper station, h = the difference of level, in toises, between the two stations, r = the distance, in toises, of the lower station to the centre of the Earth, = the latitude of the place of observation, a = the increase of gravity from the equator to the poles. Making, besides, m = the modulus of the common logarithms, the formula be- comes, with sufficient accuracy, ' ij^.^-L-^ ' 400 ' T Assuming r, or the radius of the Earth, at 45° latitude = 3266631 toises, anc a = 0.002595, instead of 0.002845 adopted in Gauss's tables, and making u = log b — log b^ / 1 1 2m '°g (9407.73 c = — m a cos 2 <£, «' = -—, then the reduction of the height of the barometer to another level is given by the formula, D 54 BAROMETRICAL MEASUREMENT OF HEIGHTS. 1. log u = log h -f- a + c + c' ; 2. log b — log b1 + M. Table I. contains the values of a for the argument t -f- t' ; 10 units are to be sub- tracted from the characteristic. Table II. gives the values of c for the argument <£, or the correction for the change of gravity in latitude, which is negative from 0° to 45°, positive from 45° to 90°. Table III. furnishes the values of c' for the argument h in toises, or the correction ;T for the decrease of gravity on the vertical. Both in Tables II. and III. the values of c and c' are given in units of the fifth decimal place. The difference of elevation of the two stations is given by the formula, 1. u = log b — log Z>', „ j 2. log h = log u + A + c + c', s.; in which A is the arithmetical complement of «, and the corrections c and c' receive re contrary signs. For the sake of convenience, the values of A have been placed in e, Table I., and in Table III. the correction for A is found in another column, with the ,.: more convenient argument v = log u -\- A. a; If the heights of the barometers have not been reduced to the freezing point, then, ie B and B' being the unreduced heights of the barometers, and T and T' the temper- oi ature of the attached thermometer in degrees of Reaumur, B B' & b :b ' = _ _ T : . -u and making — = ft, u = log b — log b' = (log B — - £T) — (log B' — ft T'). Instead of /3 = 0.000098, we can write with sufficient accuracy 0.00010. USE OF THE TABLES. I, , These tables can be used in any latitude, and for any barometrical scale ; but the indications of the barometers must be reduced to the freezing point ; and the tem- S peratures of the air must be given in degrees of Reaumur. The tables suppose the I use of logarithms with 5 decimals, such as those of Lalande, and give the results in toises. I. For Reducing Barometrical Observations to another Level. Given h in toises, t, t', <£, and b or b'. To find b or b'. In Table I. with the argument t -{- 2', take a, In Table II. with the argument <£, take c, In Table III. with the argument h, take c', the last two corrections being given in units of the fifth decimal, making log h -\- a -\- c -f- c' — 10 (whole units) = log u. Then we have for a level lower by h toises, log b = log b' -\- u; for a level higher by h toises, log b' = log b — u. If A, or the difference of elevation, is given in metres, take c', which is always negative, from Table III. (for A) with the argument v = log h -|- 9.71, and write log u = 9.71018 + log h + a + c + c' — 10 (whole units). Then again is log b — log b' -J- u. B 55 BAROMETRICAL MEASUREMENT OF HEIGHTS. Example 1. Suppose the height of the barometer, reduced to the freezing point, to be I1 = 295.39 Paris lines; the temperature of the air t' = 11°.8 Reaumur, and the latitude $ = 51° 48' ; the increase of heat downwards being 1° Reaumur for 100 toises. What is the height of the barometer, reduced to the freezing point, at a station lower by h = 498.2 toises ? In th' case * = t' + 4°.98 = 16°.78, and t + t' = 28°.58. Then log h = 2.69740 Table I. for 28°.58 gives a = 5.99538 Table II. for 51° 48' gives c = + 0.00026 Table III. for 498 toises gives c' = — 0.00007 log u = 8.69297 — 10 u = 0.04931 log V = 2.47040 log I = 2.51971 Barometer at the lower station b = 330.90 Paris lines. Example 2. Suppose the reduced barometer b' = 598.6 millimetres ; the temperature of the air t' = 18°.0 Centigrade = 14°. 4 Reaumur; the difference of elevation h = 2217 metres ; = 3°. The temperature of the air at the lower station t = 27°. 5 Cen- tigrade = 22°.0 Reaumur, and t + t' = 36° .4 Reaumur. ™ , * flog 2217= 3.34577 log h = | + 971Q18 3.05595 v = 3.06 a = 5.98750 c = — 0.00112 c' = — 0.00015 log u = 9.04218 — 10 u = 0.11020 log V = 9.77714 logJ = 9.88734 Barometer at the lower station b = 771.5 millimetres. 2. For Computing Differences of Elevation from Barometrical Observations. Given the unreduced height of the barometer at the lower and upper station, B and B' ; the temperatures of the attached thermometers, T and T' ; the temperatures of the air, t and t' ; and the latitude, <£. To find ^, or the difference of elevation between the two stations. Subtract (log B' — 10 T') from (log B — 10 T), paying due attention to the nature of the signs of T and T', and taking the numbers 10 T and 10 T' as units of the fifth decimal. Calling then (log B — 10 T) — (log B' — 10 T') — M, or if the heights of the Barometers are reduced to the freezing point, log b — log b' = w, take, In Table I., A with the argument t + *', and make v = log u + A. In Table II., with the argument <£, take c reversing the sign. D 56 BAROMETRICAL MEASUREMENT OF HEIGHTS. In Table III., for A, with the argument v, take c', which, in this case, is always positive ; then, remembering that the values of c and c1 are given in units of the = fifth decimal, we have, v -j- c -|~ c' = log h in toises, v + c + c1 + 0.28982 = log h in metres, v + c + c' + 0.80584 = log h in English feet. Example 1. o L. station B = 329.013 Paris lines ; T = +15.88 R. ; t = + 15.96 R. ; $ = 45 32. U. station B' = 268.215 Paris lines ; T' = + 8.40 R. ; t = + 7.92 R. t + V = 23.88 R. log B = 2.51722 — 10 x 15.88 = 2.51563 log B' = 2.42848 — 10 X 8.4 = 2.42764 u = 0.08799 log u = 8.94443 . A = 3.99982 v = 2.94425 c = — 0.00002 c' = + 0.00012 log h = 2.94435 h = 879.74 toises. Example 2. L. station B = 763.15 millimetres ; T = t = 25.3 Cent. = 20.24 R. ; 0 = 21. U. station B' = 600.95 millimetres ; T' = t' = 21.3 Cent. =' 17.04JR. t + t1 = 37.28 R. log B = 9.88261 — 10 x 20.24 = 9.88059 log B; = 9.77884 — 10 x 17.04 = 9.77714 11 = 0.10345 logti = 9.01473 A= 4.01337 v = 3.02810 c = + 0.00084 c' = + 0.00014 log h = 3.02908 for toises. 0.28982 log h = 3.31890 for metres, log h = 3.02908 for toises. 0.30584 log h = 3.83492 for English feet. h = 1069.3 toises = 2084.0 metres = 6837.9 English feet. D 57 1 BAROMETRICAL MEASUREMENT OF HEIGHTS. DIPPE. I. ARGUMENT : SUM OF THE TEMPERATURES OF THE AIR IN DEGREES OF REAUMUR. Correction for Correction for . 1 .» *-K Reaumur. a Difference. A i Reaumur. a Difference. A -60° 6.09617 3.90383 -20° 6.04776 3.95224 -59 6.09489 128 3.90511 -19 6.04661 115 3.95339 -58 6.09362 127 3.90638 -18 6.04547 114 3.95453 -57 6.09235 127 3.90765 -17 6.04434 113 3.95566 -56 6.09108 127 126 3.90892 -16 6.04320 114 113 3.95680 -55 6.08982 3.91018 -15 6.04207 3.95793 -54 6.08856 126 3.91144 -14 6.04094 113 3.95906 -53 6.08730 126 3.91270 -13 6.03981 113 3.96019 -52 6.08605 125 3.91395 -12 6.03S69 112 3.96131 -51 6.08480 125 124 3.91520 -11 6.03757 112 112 3.96243 -50 6.08356 3.91644 -10 6.03645 3.96355 -49 6.08231 125 3.91769 - 9 6.03533 112 3.96467 -48 6.08108 123 3.91892 - 8 6.03422 111 3.96578 -47 " 6.07984 124 3.92016 - 7 6.03311 111 3.96689 -46 6.07861 123 3.92139 - 6 6.03201 110 3.96799 123 111 -45 6.07738 3.92262 - 5 6.03090 3.96910 -44 6.07616 122 3.92384 - 4 6.02980 110 3.97020 -43 6.07494 122 3.92506 - 3 6.02871 109 3.97129 -42 6.07372 122 3.92628 - 2 6.02761 110 3.97239 -41 6.07250 122 3.92750 _ •• 6.02652 109 3.97348 121 109 -40 6.07129 3.92871 0 6.02543 3.97457 -39 6.07009 120 3.92991 + 1 6.02434 109 3.97566 -38 6.06888 121 3.93112 2 6.02326 108 3.97674 -37 6.06768 1-20 3.93232 3 6.02217 109 3.97783 -36 6.06648 120 3.93352 4 6.02109 108 3.97891 119 107 -35 6.06529 3.93471 5 6.02002 3.97998 -34 6.06410 119 3.93590 6 6.01895 107 3.98105 -33 6.06291 119 3.93709 7 6.01787 108 3.98213 -32 6.06173 118 3.93827 8 6.01680 107 398320 -31 6.06055 118 3.93945 9 6.01574 106 3.98426 118 106 -30 6.05937 3.94063 10 6.01468 3.98532 -29 6.05819 118 3.94181 11 6.01362 106 3.98638 -28 6.05702 117 3.94298 12 6.01256 106 3.98744 -27 6.05585 117 3.94415 13 6.01150 106 3.98850 -26 6.05469 116 3.94531 14 6.01045 105 3.98955 117 105 -25 6.05352 3.94648 15 6.00940 3.99060 -24 6.05236 116 3.94764 16 6.00835 105 3.99165 —23 6.05121 115 3.94879 17 6.00731 104 3.99269 -22 6.05005 116 3.94995 18 6.00626 105 3.99374 -21 6.04890 115 3.95110 19 6.00522 104 3.99478 -20 6.04776 114 3.95224 +20 6.00418 104 3.99582 D 58 BAROMETRICAL MEASUREMENT OF HEIGHTS. DIPPE. ( Continued.") Correction for Correction for *-M' t4-t' i Reaumur. a Difference. A v i * Reaumur. a Difference. A +20° 6.00418 3.99582 +40° 5.98393 4.01607 103 99 21 6.00315 3.99685 41 5.98294 4.01706 22 6.00212 103 3.99788 42 5.98195 99 4.01805 23 6.00108 104 3.99892 43 5.98097 98 4.01903 24 6.00006 102 3.99994 44 5.97998 99 4.02002 103 98 25 5.99903 4.00097 45 5.97900 4.02100 26 5.99801 102 4.00199 46 5.97803 97 4.02197 27 5.99699 102 .00301 47 5.97705 98 4.02295 28 5.99597 102 .00403 48 5.97608 97 4.02392 29 5.99495 102 .00505 49 5.97511 97 4.02489 101 97 30 5.99394 .00606 50 5.97414 4.02586 101 97 31 5.99293 .00707 51 5.97317 4.02683 32 5.99192 101 4.00808 52 5.97221 96 4.02779 33 5.99091 101 4.00909 53 5.97124 97 4.02876 34 5.98991 100 4.01009 54 5.97028 96 4.02972 101 95 35 5.98890 4.01110 55 5.96933 4.03067 36 5.98790 100 4.01210 56 5.96837 96 4.03163 37 5.98691 99 4.01309 57 5.96742 95 4.03258 38 5.98591 100 4.01409 58 5.96646 96 4.03354 39 5.98492 99 4.01508 59 5.96551 95 4.03449 II. LATITUDE. — CORRECTION FOR a. III. DECREASE OF GRAVITY ON THE VERTICAL. — CORRECTION For A reverse the Signs of c. For a, argument h, in Toises, c' always Negative. For A, arg. r, c' always Positive. + c t> t> c t> * c f h c' ft c' 9 c' 0 0 -113+ o 90 o 15 -98+ o 75 o 30 -56+ o 60 100 I 1600 21 1.8 1 1 113 89 16 96 74 31 53 59 200 3 1700 23 1.9 1 2 112 88 17 93 73 32 49 58 300 4 1800 24 2.0 1 3 112 87 18 91 72 33 46 57 400 5 1900 25 2.1 2 4 112 86 19 89 71 34 42 56 500 7 2000 27 2.2 2 2.3 3 5 111 85 20 86 70 35 39 55 600 8 2100 28 2.4 3 6 110 84 21 84 69 36 35 54 700 9 2200 29 2.5 4 7 109 83 22 81 68 37 31 53 800 11 2300 31 2.6 5 8 108 82 23 78 67 38 27 52 900 12 2400 32 2-7 7 9 107 81 24 75 66 39 23 51 1000 13 2500 33 2.8 8 2.9 11 10 106 80 25 72 65 40 20 50 1100 15 2600 35 3.0 13 11 104 79 26 69 64 41 16 49 1200 16 2700 36 3.1 17 12 103 78 27 66 63 42 12 48 1300 17 2800 37 3.2 21 13 101 77 28 63 62 43 8 47 1400 19 2900 39 3.3 27 14 100 76 29 60 61 44 4 46 1500 20 3000 40 3.4 33 3.5 42 15 -98+ 75 30 -56+ 60 45 -0+ 45 1600 21 3500 47 3.6 53 D 59 V. TABLES FOR REDUCING BAROMETRICAL OBSERVATIONS TO ANOTHER LEVEL, AND FOR COMPUTING DIFFERENCES OF ELEVATION MEASURED BY THE BAROMETER, BY M. C. DIPPE. IN No. 1088 of the Astronomische Nachrichten, published in June, 1857, DR. DIPPE gives the following set of Tables for reducing barometrical observations tc another level, and for computing heights. These tables, being based, as the preced- ing ones (IV.), on the formula of Laplace, and computed with the same constants, give results nearly identical, but dispense with the use of logarithms. USE OF THE TABLES. The tables suppose the height of the barometer to be expressed in French inches or Paris lines, and the temperature in degrees of Reaumur; they give the differ- ences of level in French toises. The signs used have the following signification : — {B = Observed Height of Barometer in Paris lines. T = Attached Thermometer in degrees of Reaumur. b = Barometer reduced to the freezing point. t = Temperature of the air, detached Thermometer. IB' = Observed Height of Barometer. T' = Attached Thermometer. I1 = Barometer at the freezing point. ^ t' = Temperature of the air. 0 = Latitude of the place. h = Difference of elevation between the two stations. I. For Reducing Barometrical Observations to another Level. Given, A in toises, t, *', <£, and I or I1. To find I or I1. Make first 2 T = -~- and T, and D 60 BAROMETRICAL MEASUREMENT OF HEIGHTS. In Table I., with the argument 2 T, take rf ; In Table III., with the arguments h and T, take C ; In Table IV., with the arguments h and <£, take C' ; Make, further, u = h + C + C' and ^ r1 ; And if b' be given, and b required, In Table II., with the argument J, take H ; then is H = H' -\- (u — T™ T/)» •and the height of the barometer, in Table II., due .to H, is b required. If b be given, and b' required for a level higher by h toises, then, In Table II., with the argument 5, take H'. o Make, further, " 100 '' and b' is the height of the barometer in Table II., corresponding to H'. Example 1. I Suppose the height of the barometer reduced to the freezing point to be b' = 1295.39 Paris lines ; the temperature of the air t' — 11°.8 Reaumur; and the latitude J> = 51°.48 ; the increase of heat downwards being 1° Reaumur for 100 toises. 'What is the height of the barometer reduced to the freezing point, at a station lower 3y h — 498.2 toises ? In this case, t' = 11°.8 ; t = 11°.8 + 4°.98 ;* + *' = 28°.58 ; 2r= '-±f=14".29; r = 7°.15; md according to Table I. r1 — + 6.67. With h and T, in Table III., we find C = — 1.4 With h and <£, in Table IV., we find C' = + 0.3 We add h = 498.2 and we have u = 497.1 ; ioo= *-Wl „ T. = + 6.67 .34 463.95 . With b', in Table II., we find H' = 367.86 10° H = 831.81 Finally, with H, in Table II., we find b = 330.91 Paris lines, which is the required weight of the barometer at the lower station. Gauss's tables (IV.) would give b = 130.90 lines. D 61 BAROMETRICAL MEASUREMENT OF HEIGHTS. Example 2. Suppose I1 = 330.46 Paris lines ; t' = — 12°.3 Reaumur ; h' = 92.7 toises = 62°. In this case, assuming t = t' , 2r=^=— 12°.3; r=— 6.15; and according to Table I. r1 = — 6.55. With h and r, in Table III., take C = — 0.2 With h and <£, in Table IV., take C' = + 0.1 Add h = _92.7 We have u = 92^6 ~ = u T< = — 6.55 98.67 _^ , With £', in Table II., take H' = 826.22 10° T' U= 924.89 With H, in Table II., we find b = 338.53 Paris lines. Gauss's tables (IV.) woul< give b = 338.54 lines. II. For Computing Differences of Elevation from Barometrical Observations. Suppose to be given B, B', T, T', t, t', ; required h. Make first r = -tl and T — T'. Then in Table II., with the argument j S/f \6 Vf> ^ JJ LcttVL/ i J. ^ and make TT TT' 100 in which each full degree of T — T' corresponds to a toise. Further, in Table III., with u and T, take C reversing the sign ; in Table IV., with u and <£, take C' reversing the sign ; in Table V., with T — T' and r, take C ' with the signs of T — T'. Then the difference of elevation required is A^M-j-C + C'-j- C". If the heights of the barometer, reduced to the freezing point, or b and £', are given then in Table II., with the argument, | */l^e^j/ and make 100 Further, in Table III., take C reversing the sign ; in Table IV., take C' reversing the sign ; and h = u + C + C'. D 62 BAROMETRICAL MEASUREMENT OF HEIGHTS. Example 1. Suppose to be given, B = 333.6 Paris lines ; T = + 17°.0 Reaumur ; t = + 19°.0 R. ; = 48°. B' = 289.9 Paris lines ; T' = + I6°.3 Reaumur ; f = -f 15°.2 R. T — T' = 0°.7 t + t' = + 34°.2 r = + 8.55 In Table II. with B take H = 864.9 with B' take H' = 291.2 H — H' = 573.7 H i^ = 6-737 H — H' T-+8.55 "IOC *' = 49'°6 II? u = 622.06 10° In Table III., with u and T, take C = +1.8 In Table IV., with u and <£, take C' = — 0.2 In Table V., with T — T' and r take C" = 0.0 Difference of elevation, or h = 623.66 toises. Gauss's Tables give 623.64 toises. Example 2. Suppose to be given, b = 342.68 Paris lines ; t = — 10°.38 Reaumur ; <£ = 65°. I' = 285.47 Paris lines ; t' = — 14°.94 Reaumur; T — T' = 0°. R. t -f t1 = — 25°.32 T = — 6.33 In Table II. with I take H = 974.58 " with V take H' = 228.28 H — H' = 746.30 H^,H'= 7463 H H' T = — 6.33 -loo- * - ~47'24 12 = 699.06 H-H' In Table III., with u and T, take C = + 1.8 10° In Table IV., with u and <£, take C7 = — 1.2 A= 699.66 Gauss's Tables give A = 699.72 toises. 63 Y. TABLES FOR REDUCING BAROMETRICAL OBSERVATIONS TO ANOTHER LEVEL, AND FOR COMPUTING DIFFERENCES OF ELEVATION, BY M. C. DIPPE. TABLE I. — Argument, the observed Height of the Barometer at either Station. Barom- eter! a Paris Lines. i BorB' Tenths of a Line. 0 1 2 3 4 5 6 7 8 9 H or H' in Toises = 270 0.7 2.2 3.7 5.2 6.7 8.2 9.7 11.2 12.8 14.3 271 15.8 17.3 18.8 20.3 21.8 23.3 24.8 26.3 27.8 29.3 272 30.8 32.3 33.8 35.3 36.8 38.3 39.8 41.3 42.8 44.3 273 45.8 47.3 48.8 50.3 51.8 53.3 54.8 56.3 57.8 59.3 274 60.8 62.2 63.7 65.2 66.7 68.2 69.7 71.2 72.7 74.1 273 75.6 77.1 78.6 80.1 81.6 83.1 84.5 86.0 87.5 89.0 23 Inch. 276 90.5 91.9 93.4 94.9 96.4 97.9 99.3 100.8 102.3 103.8 277 105.2 106.7 108.2 109.7 111.1 112.6 114.1 115.6 117.0 118.5 278 120.0 121.4 122.9 124.4 125.8 127.3 128.8 130.2 131.7 133.2 279 134.6 136.1 137.6 139.0 140.5 142.0 143.4 144.9 146.3 147.8 280 149.3 150.7 152.2 153.6 155.1 156.5 158.0 159.5 160.9 162.4 281 163.8 165.3 166.7 168.2 169.6 171.1 172.5 174.0 175.4 176.9 282 178.3 179.8 181.2 182.7 184.1 185.6 187.0 188.5 189.9 191.4 283 192.8 194.2 195.7 197.1 198.6 200.0 201.4 202.9 204.3 205.8 284 207.2 208.6 210.1 211.5 213.0 214.4 215.8 217.3 218.7 220.1 285 221.6 223.0 224.4 225.9 227.3 228.7 230.2 231.6 233.0 234.5 286 235.9 237.3 238.7 240.2 241.6 243.0 244.4 245.9 247.3 248.7 287 250.1 251.6 253.0 254.4 255.8 257.3 258.7 260.1 261.5 262.9 34 Inch. 288 264.4 265.8 267.2 268.6 270.0 271.4 272.9 274.3 275.7 277.1 289 278.5 279.9 281.3 282.8 284.2 285.6 287.0 288.4 289.8 291.2 290 292.6 294.0 295.4 296.8 298.3 299.7 301.1 302.5 303.9 305.3 291 306.7 308.1 309.5 310.9 312.3 313.7 315.1 316.5 317.9 319.3 292 320.7 322 1 323.5 324.9 326.3 327.7 329.1 330.5 331.9 333.3 293 334.7 336.1 337.5 338.9 340.2 341.6 343.0 344.4 345.8 347.2 294 348.6 350.0 351.4 352.8 354.2 355.5 356.9 358.3 359.7 361.1 295 362.5 363.9 365.2 366.6 368.0 369.4 370.8 372.2 373.5 374.9 296 376.3 377.7 379.1 380.4 381.8 383.2 384.6 385.9 387.3 388.7 297 390.1 391.5 392.8 394.2 395.6 397.0 398.3 399.7 401.1 402.4 298 403.8 405.2 406.5 407.9 409.3 410.7 412.0 413.4 414.8 416.1 299 417.5 418.9 420.2 421.6 423.0 424.3 425.7 427.1 428.4 429.8 35 Inch 300 431.1 432.5 433.9 435.2 436.6 437.9 439.3 440.7 442.0 443.4 301 444.7 446.1 447.5 448.8 450.2 451.5 452.9 454.2 455.6 456.9 302 458.3 459.6 461.0 462.3 463.7 465.0 466.4 467.8 469.1 470.5 303 471.8 473.1 474.5 475.8 477.2 478.5 479.9 481.2 482.6 483.9 304 485.3 486.6 487.9 489.3 490.6 492.0 493.3 494.7 496.0 497.3 305 498.7 500.0 501.4 502.7 504.0 505.4 506.7 508.0 509.4 510.7 306 512.0 513.4 514.7 516.0 517.4 518.7 520.1 521.4 522.7 524.0 D 64 BAROMETRICAL MEASUREMENT OF HEIGHTS. DIPPE. TABLE I. Continued. Barom- > eter in Paris Lines. Tenths of a Line. 0 1 2 3 4 5 6 •7 8 9 306 512.0 513.4 514.7 516.0 517.4 518.7 520.1 521.4 522.7 524.0 307 525.4 526.7 528.0 529.4 530.7 532.0 533.4 534.7 536.0 537.4 308 538.7 540.0 541.3 542.6 544.0 545.3 546.6 547.9 549.3 550.6 309 551.9 553.2 554.6 555.9 557.2 558.5 559.8 561.2 562.5 563.8 310 565.1 566.4 567.8 569.1 570.4 571.7 573.0 574.3 575.6 576.9 311 578.3 579.6 580.9 582.2 583.5 584.8 586.1 587.5 588.8 590.1 36 Inch. 312 591.4 592.7 594.0 595.3 596.6 597.9 599.2 600.6 601.9 603.2 313 604.5 605.8 607.1 608.4 609.7 611.0 612.3 613.6 614.9 616.2 314 617.5 618.8 620.1 621.4 622.7 624.0 625.3 626.6 627.9 629.2 315 630.5 631.8 633.1 634.4 635.7 637.0 638.3 639.5 640.8 642.1 316 643.4 644.7 646.0 647.3 648.6 649.9 651.2 652.5 653.8 655.1 317 656.3 657.6 658.9 660.2 661.5 662-8 664.1 665.4 666.6 667.9 313 669.2 670.5 671.8 673.1 674.3 675.6 676.9 678.2 679.5 680.8 319 6S2-0 683.3 684.6 685.9 687.2 688.4 689.7 691.0 692.3 693.6 320 694.8 696.1 697.4 698.7 699.9 701.2 702.5 703.8 705.0 706.3 321 707.6 70S.9 710.1 711.4 712.7 713.9 715.2 716.5 717.7 719.0 322 720.3 721.6 722.8 724.1 725.4 726.6 727.9 729.2 730.4 731.7 323 733.0 734.2 735.5 736.7 738.0 739.3 740.5 741.8 743.1 744.3 37 Inch. 324 745.6 746.8 748.1 749.4 750.6 751.9 753.2 754.4 755.7 756.9 325 758.2 759.4 760.7 761.9 763.2 764.5 765.7 767.0 768.2 769.5 326 770.7 772.0 773.2 774.5 775.7 777.0 778.2 779.5 780.7 7S2.0 327 783.2 784.5 785.7 787.0 788.2 789.5 790.7 792.0 793.2 794.5 328 795.7 797.0 798. 2 799.4 800.7 801.9 803.2 804.4 805.7 806.9 329 808.2 809.4 810.6 811.9 813.1 814.4 815.6 816.8 818.1 819.3 330 820.6 821.8 823.0 824.3 825.5 826.7 828.0 829.2 830.4 831.7 331 832.9 834.2 835.4 836.6 837.9 839.1 840.3 841.6 842.8 844.0 332 845.2 846.5 847.7 848.9 850.2 851.4 852.6 853.9 855.1 856.3 333 857.5 858.8 860.0 861.2 862.4 863.7 864.9 866.1 867.3 868.6 334 869.8 871.0 872.2 873.4 874.7 875.9 877.1 878.3 879.6 880.8 335 882.0 883.2 884.4 885.7 886.9 888.1 889.3 890.5 891.7 893.0 38 Inch. 336 894.2 895.4 896.6 897.8 899.0 900.3 901.5 902.7 903.9 905.1 337 906.3 907.5 908.7 909.9 911.2 912.4 913.6 914.8 916.0 917.2 338 918.4 919.6 920.8 922.0 923.3 924.5 925.7 926.9 928.1 929.3 339 930.5 931.7 932.9 934.1 935.3 936.5 937.7 938.9 940.1 941.3 340 942.5 943.7 944.9 946.1 947.3 948.5 949.7 950.9 952.1 953.3 341 954.5 955.7 956.9 958.1 959.3 960.5 961.7 962.9 964.1 965.3 342 966.5 967.7 968.9 970.1 971.3 9725 973.7 974.8 976.0 977.2 343 978.4 979.6 980.8 982.0 983.2 984.4 935.6 986.8 987.9 939.1 344 990.3 991.5 992.7 993.9 995.1 996.2 997.4 998.6 999.8 1001.0 345 1002-2 1003.4 1004.5 1005.7 1006.9 100S.1 1009.3 1010.5 1011.6 1012.8 346 1014-0 1015.2 1016.4 1017.5 1018.7 1019.9 1021.1 1022.3 1023.4 1024.6 347 1025.8 1027.0 1028.1 1029.3 1030.5 1031.7 1032.8 1034.0 1035.2 1036.4 39 Inch 348 1037-5 1038.7 1039.9 1041.1 1042.2 1043.4 1044.6 1045.8 10469 1048.1 65 BAROMETRICAL MEASUREMENT OF HEIGHTS. DIPPE. TABLE II. CORRECTION FOR THE TEMPERATURE OF THE AIR. t+t' ARGUMENT, 2r = — ' — . 2T r' Diff. 2r r' Diff. 2r i' Diff. 2r T' Diff. -25 -14.29 -12 -6.38 + 1 +0.50 + 14 + 6.54 -24 -13.64 0.65 -11 -5.82 0.56 2 0.99 0.49 15 6.98 0-44 -23 -13.00 0.64 -10 -5.26 0.56 3 1.48 0.49 16 7.41 0.43 -22 -12.36 0.64 - 9 -4.71 0.55 4 1.96 0.48 17 7.83 0.42 -21 -11.73 0.63 - 8 -4.17 0.54 5 2.44 0.48 18 8.26 0.43 0.62 0.54 0.47 0.42 -20 -11.11 - 7 -3.63 6 2.91 19 8.68 -19 -10.50 0.61 - 6 -3.09 0.54 7 3.38 0.47 20 9.09 0.41 -18 - 9.89 0.61 - 5 -2.56 0.53 8 3.85 0.47 21 9.50 0.41 -17 - 9.29 0.60 - 4 -2.04 0.52 9 4.31 0.46 22 9.91 0.41 -16 - 8.70 0.59 - 3 -1.52 0.52 10 4.76 0.45 23 10.31 0.40 0.59 0.51 0.45 0.40 -15 - 8.11 - 2 -1.01 11 5.21 24 10.71 -14 - 7.53 0.58 - 1 -0.50 0.51 12 5.66 0.45 25 11.11 0.40 -13 - 6.95 0.58 0 0.00 0.50 13 6.10 0.44 26 11.50 0.39 -12 - 6.38 0.57 + 1 +0.50 0.50 +14 +6.54 0.44 +27 +11.89 0.39 TABLE III. FOR C. ARGUMENTS, h and r. In computing Heights reverse the signs of C. — Arguments, T and «. *,(«) T, in Degrees of Reaumur = Toises. —16° —12° —8° —4° 0° +4° +8° + 12° + 16° 50 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 100 0.2 0.2 0.2 0.2 0.3 0.3 0.3 0.3 0.3 150 0.3 0.3 0.4 0.4 0.4 0.4 0.4 0.4 0.4 200 0.4 0.5 0.5 0.5 0.5 0.5 0.6 0.6 0.6 250 0.5 0.6 0.6 0.6 0.6 0.7 0.7 0.7 0.7 300 0.7 0.7 0.7 0.7 0.8 0.8 0.8 0.9 0.9 350 0.8 0.8 0.8 0.9 0.9 0.9 1.0 1.0 1.1 400 0.9 0.9 1.0 1.0 1.0 .1 1.1 1.2 1.2 450 1.0 1.1 .1 1.1 1.2 .2 1.3 1.3 1.4 500 1.1 1.2 .2 1.3 1.3 .4 1.4 1.5 1.5 550 1.2 1.3 .4 1.4 1.5 .5 1.6 1.6 1.7 600 1.4 1.4 .5 1.6 1.6 .7 1.7 1.8 1.9 650 1.5 1.6 .6 1.7 1.8 .8 1.9 1.9 2.0 700 1.6 1.7 .8 1.8 1.9 2.0 2.0 2.1 2.2 750 1.7 1.8 .9 2.0 2.0 2.1 2.2 2.3 2.3 800 1.9 2.0 2.0 2.1 2.2 2.3 2.4 2.4 2.5 850 2.0 2.1 2.2 2.3 2.3 2.4 2.5 2.6 2.7 900 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 950 2.3 2.4 2.5 2.6 2.7 2.7 2.9 3.0 3.1 1000 2.4 2.5 2.6 2.7 2.8 2.9 3.1 3.2 3.3 D 66 BAROMETRICAL MEASUREMENT OF HEIGHTS. DIPPE. TABLE IV. FOR C'. CORRECTION IN TOISES FOR THE CHANGE OF GRAVITY IN LATITUDE. In computing Heights, reverse the signs of C'. ARGUMENTS

= the latitude of the place, £ — the height of the barometer, ^ T = the temperature, Fahrenheit, of the mercury, >• t — the temperature, Fahrenheit, of the air, ) j3' = the height of the barometer, ") T' = the temperature, Fahrenheit, of the mercury, £ at t' = the temperature, Fahrenheit, of the air. ) 'he numerical values assumed are as follows : — The constant barometrical coefficient = 60158.53 English feet. The expansion of moist air for 1° Fahrenheit = .0022222. The expansion of mercury for 1° Fahrenheit = .0001001. The increase of gravitation from Equator to Poles = .00539. The radius of the Earth at tf> = 20898240 English feet. The height of lower station assumed = 4000 English feet. Make A = the log of the first term, in English feet. B = the log of 1 + .0001 (T — T'). C = the log of the last term. D = log/3 — (log/^-f B). Then, by the tables which follow, the logarithm of the difference of altitude in English feet = A + C + log D. Baily's Tables have been recomputed and extended by Downes, for Lee's Collection of Tables and Formula (2d edit. pp. 84, 85). These new tables are given here as revised by Mr. Downes for this volume. D 69 BAROMETRICAL MEASUREMENT OF HEIGHTS. BAILY. I. THERMOMETERS IN THE OPEN AIR. ,+, A t + t A f'+" A t + t A t + t A 9 1 4.74913 0 37 4.76742 o 73 4.78497 0 109 4.80183 o 145 4.81807 j 2 4.74965 38 4.76791 74 4.78544 110 4.80229 146 4.81851 i 3 4.75016 39 4.76841 75 4.78592 111 4.80275 147 4.81896 j 4 4.75068 40 4.76891 76 4.78640 112 4.80321 148 4.81940 5 4.75120 41 4.76940 77 4.78687 113 4.80367 149 4.819S4 6 4.75171 42 4.76990 78 4.78735 114 4.80413 150 4.82028 | 7 4.75223 43 4.77039 79 4.78782 115 4.80458 151 4.82072 8 4.75274 44 4 77089 80 4.78830 116 4.80504 152 4.82116 ! 9 4.75326 45 4.77138 81 4.78877 117 4.80550 153 4.82160 j 10 4.75377 46 4.77187 82 4.78925 118 4.80595 154 4.82204 11 4.75429 47 4.77236 83 4.78972 119 4.80641 155 4.82248 12 4.75480 48 4.77285 84 4.79019 120 4.80686 156 4.82291 13 4.75531 49 4.77335 85 4.79066 121 4.80731 157 4.82335 14 4 75582 50 4.77384 86 4.79113 122 4.80777 158 4.82379 ! 15 4.75633 51 4.77433 87 4.791CO 123 4.80822 159 4.82423 | 16 4.75684 52 4.77482 88 4.79207 124 4.80867 160 4.82466 j 17 4.75735 53 4.77530 89 4.79254 125 4.80913 161 4.82510 18 4.75786 54 4.77579 90 4.79301 126 4.80958 162 4.82553 1 19 4.75837 55 4.77628 91 4.79348 127 4.81003 163 4.82597 j 20 4.75888 56 4.77677 92 4.79395 128 4.81048 164 4.82640 1 21 4.75938 57 4.77725 93 4 79442 129 4.81093 165 4.82684 ! 22 4.75989 58 4.77774 94 4.79489 130 4.81138 166 4.82727 23 4.76040 59 4.77823 95 4.79535 131 4.81183 167 4.82770 ! 24 4,76090 60 4.77871 96 4.79582 132 4.81228 168 4.82814 | 25 4,76141 61 4.77919 97 4.79628 133 4.81273 169 4.82857 26 4,76191 62 4.77968 98 4.79675 134 4.81317 170 4.82900 27 4,76241 63 4.78016 99 4.79721 135 4.81362 171 4.82943 28 4,76292 64 4.78065 100 4.79768 136 4.81407 172 4.82986 29 4,76342 65 4.78113 101 4.79814 137 4.81452 173 4.83029 30 4,76392 66 4.78161 102 4.79861 138 4.81496 174 4.83072 31 4,76442 67 4.78209 103 4.79907 139 4.81541 175 4.8311b 32 4,76492 68 4.78257 104 4.79953 140 4.81585 176 4.83158 33 4,76542 69 4.78305 105 4.79999 141 4.81630 177 4.83201 34 4.76592 70 4.78353 106 4.80045 142 4.81674 178 4.83244 35 4.76642 71 4.78401 107 4.80091 143 4.81719 179 4.83287 36 4.76692 72 4.78449 108 4.80137 144 4.81763 180 4.83330 70 BAROMETRICAL MEASUREMENT OF HEIGHTS. BAILY. II. ATTACHED THERMOMETER. III. LATITUDE OF THE PLACE. T — r B r — T B T T' B <£ C o 0 0.00000 o 20 0.00087 O 40 0.00174 0 0 0.00117 1 0.00004 21 0.00091 41 0.00178 5 0.00115 2 0.00009 22 0.00096 42 0.00182 10 0.00110 a 0.00013 23 0.00100 43 0.00187 15 0.00101 4 0.00017 24 0.00104 44 0.00191 20 0.00090 5 0.00022 25 0.00109 45 0.00195 25 0.00075 6 0.00026 26 0.00113 46 0.00200 30 0.00058 7 0.00030 27 0.00117 47 0.00204 35 0.00040 8 0.00035 28 0.00122 48 0.00208 40 0.00020 9 0.00039 29 0.00126 49 0.00212 45 0.00000 10 0.00043 30 0.00130 50 0.00217 50 9.99980 11 0.00048 31 0.00135 51 0.00221 55 9.99960 12 0.00052 32 0.00139 52 0.00225 60 9.99942 13 0.00056 33 0.00143 53 0.00230 65 9.99925 14 0.00061 34 0.00148 54 0.00234 70 9.99910 15 0.00065 35 0.00152 55 0.00238 75 9.99900 16 0.00069 36 0.00156 56 0.00243 80 9.99890 17 0.00074 37 0.00161 57 0.00247 85 9.99885 18 0.00078 38 0.00165 58 0.00251 90 9.99883 19 0.00083 39 0.00169 59 0.00256 EXAMPLE. Thermometer in open air, Attached Thermometer, Barometer, Latitude of the place B = 0.00031 log ft' = 1.37401 1.87432 log 3 — 1.47784 D = 0.10352 Upper Station. Lower Station. t1 = 70.4, * = 77.6. T> = 70.4, T = 77.6. ft1 = 23.66 inches, ft = 30.05 inches. <£ = 21°. log D — 9.01502 C = 0.00087 A = 4.81940 3.83529 = 6843.7 English feet. D 71 VIII. TABLES FOR COMPUTING DIFFERENCES OF ELEVATION FROM BAROMETRICAL OBSERVATIONS, BY E. PLANTAMOUR. [These Tables, computed by Professor E. PLANTAMOUR, Director of the Observatory at Geneva, Switzerland, are found in Vol.. XIII. Part 1, of the Memoires de la Socie'te de Physique, frc. de Geneve, p. 63, together with the following explanations.] IN No. 356 of the Astronomische Nachrichten, Bessel published a paper on the measurement of heights by means of the barometer, in which he deduces a formula which contains a factor depending on the humidity of the air. This formula is : '— HP. 0.002561 0.0279712 T-. 0.0000625826 T . . 7" f] where the various quantities have the following signification : — h being the elevation of the lower station, and h1 the elevation of the upper station above the level of the sea, a = the radius of the Earth, IT' = P = the weight of the atmosphere at the lower station, P' =. the weight of the atmosphere at the upper station, the unit of weight assumed being the pressure of a column of mercury 72 BAROMETRICAL MEASUREMENT OF HEIGHTS. of 336.905 Paris lines, at the temperature of the freezing point, or zero Reaumur, and under the 45th degree of latitude. (g) = the gravity, at the level of the sea, in the mean latitude between the two places of observation. Therefore, calling the latitude, (g) — l _ 0.0026257 cos <£, L = the constant barometrical coefficient depending on the relative density of the mercury and of the air, K — the coefficient of the expansion of the air, T = the mean temperature of the layer of air between the lower and upper station, a = the fraction of saturation of the same layer. The second term in the parenthesis, destined to take into account the aqueous vapor in the air, was obtained by assuming that the elastic force of vapor for a temperature T is represented, in unit of weight, by the expression, , - 0.0067407 X 10 0.0279712 T- 0.0000625826 T'. Multiplying the second member by 336.905 we find the expression of the elastic force of vapor that Laplace deduced from Dalton's experiments. Substituting, in the computation, Regnault's results, the numerical value of these coefficients is some- what changed, and we find then ^, = 0.0060527 X 10 0.0301975 T- 0.000080170 T . BessePs tables give the difference of elevation in toises. The logarithm of the dif- ference is obtained by the sum of four logarithms. The same form is preserved in the following tables ; but the differences of elevation are given in metres. The term due to the expansion of the air is computed in BessePs tables for two values of the coefficient, viz. that of Gay-Lussac, 0.00375, and that of Rudberg, 0.003648 ; in the new tables it is only computed for that of Regnault, 0.003665. The relative density of dry air at the freezing point, under a barometrical pressure of Om-.76, and at the 45th degree of latitude, and of mercury in the same circumstan- ces, adopted by Bessel, is that determined by the experiments of Biot and Arago, viz. ; 0. The value of that constant derived from Regnault's experiments has been 10466.8 substituted. Regnault found the weight of a litre of dry air, at zero Centigrade, under a pressure of 0"\76, and at the latitude of Paris, to be 1.293187 grammes, which, reduced to the gravity of the 45th degree of latitude, becomes 1.292732 grammes. The weight of a litre of mercury, at zero Centigrade, he found to be 13596 grammes ; the ratio is thus : 10517.3' D 73 BAROMETRICAL MEASUREMENT OF HEIGHTS. or about ^^ smaller than the value adopted by Bessel. If the constant coefficient L is expressed by L = -^ numerical value becomes L is expressed by L = -^ — , /t being the modulus of the common logarithms, its L = 18404m .8. In order to reduce the formula into tables, Bessel caused it to undergo several modifications, which we have followed, introducing the values of the constants above mentioned. Let b and I' be the heights of the barometer, expressed in the metrical scale, at the two stations ; t and *', the temperatures of the mercury measured with a brass scale ; we have, p_ b ,. / a_\8 (1+ .0.000018790 - Om..76 • (S) • ^a_j_Ay (i -j-0. 00018018 0' and p,_ V , v /a y (1 -f- 0.00001879 Q - Om.>76 • (S) • ^a-j-Ay (i _j_ o.OOOl 801 8 1)' Therefore, log P = log I + log (g) — log Om-.76 — !5i£ — ,, t [0.00018018 — 0.00001879], I log P = log If + log (g) — log Om-.76 — ?^ __ p t» [0.00018018 — 0.00001879]. If we call B, B' the heights of the barometer reduced to the freezing point, which we obtain by making log B = log I — t . 0.000070095 ; log B' = log V — t' . 0.000070095, and with sufficient accuracy, 0"'-.76 Substituting these expressions in the formula, it becomes, log B — log B' = (g) • H/ — H T L (1 -f K T) a . 0.001 748 0.0301 9 75 T — 0.000080170 T2"| L (1 + K T) L1 - (g) . 7329755 " —^~^~ ' 1( If we set instead of a the half sum ^— of the fraction of saturation observed at both stations, we find, after some transformations, D 74 i BAROMETRICAL MEASUREMENT OF HEIGHTS. (g.) (H'-H) (397.25- K T) log B - log B -398.25. L(l + KT)-~ [(a _|_ a') . 0.34807 0.0301975 T — 0.0000801 70 T21 1 "~~ (397.25 — KT) y/BB' * J* Making further, _ 0.34807 0.0301975 T — 0.000080170 T2 ~ ~~ ' we shall have for the logarithm of the approximate difference of level between the two stations H' — H, log (H' — H) = log [log B — log B'] + bg V + log - L-j-p + log <*>. 1 _. W -^t_a- V/ B B' Table I. gives the values of log V and log W, both of which only depend on the temperature ; the argument is the sum of the temperature of the air, T and T', ob- served at both stations, supposing T + r1 = 2 T. Table II. gives the factor depending on the humidity of the air ; with the argu- ment we obtain log - l = log V. 'I/BE' Table III. gives the factor depending on the latitude for every degree, viz. log G' = log -JT- . The logarithm of the approximate difference is thus given by the sum of four logarithms. To obtain the exact elevation, the small correction found in Table IV. must be added to the number corresponding to that logarithm. For we have, with the necessary accuracy, ft/ _ ft = H' — H + 51* _ 5*. a a H2 Table IV. gives, for every 200 metres, the quantity — ; the number in the table H'2 corresponding to — must be added to the approximate elevation ; and the number H2 corresponding to — must be subtracted from the same. D 75 BAROMETRICAL MEASUREMENT OF HEIGHTS. USE OF THE TABLES. Reduce first the observed height of the barometer at both stations to the freezing point by means of the usual tables, or by the logarithmic formula, log B = log b — t . 0.00007, log B7 = log & — t' 0.00007 ; I and I1 being, in fractions of metre, the observed heights at the temperatures t and t' marked by the attached thermometers ; and B and B' the reduced height at the lower and upper station. Take the difference of log B and log B', and find, in the tables of the common logarithms, the logarithm of that difference, viz. log (log B — log B') ; find also the logarithm of the product \/ B B7, or Make further the sum T -f- r1 of the temperature of the air at both stations, and like- wise the sum of a -f- a/ of the fraction of saturation. Then, in Table I., with argument r -\- r7, take log V and log W ; further, to log W add log (a -|- a7), and subtract log \/BB7 ; and with the logarithm thus obtained as argument, take in Table II. log V7. Table III. with the mean latitude of the stations gives log G'. H' — H being the approximate difference of level between the two stations, we have log (H7 — H) = log (log B — log B') + log V + log V7 + log G7. The altitude of the lower station being known, we deduce from H7 — H the ap- proximate altitude, H7, of the upper station ; A7, the exact altitude, or h' — A, the difference of elevation, is given by the formula, TT'2 TT2 h' — h = H7 — H + - -- — . a a H' 2 H 2 Table IV. gives the values of — and — for the values of H7 or H for every i 200 metres. Example 1. • Computing the height of St. Bernard, taking Geneva, 407 metres above the level of the sea, as the lower station. The observation gives, B = 726.43 millimetres B7 = 563.64 millimetres T = + 8°.97 Centigrade r7 = — 1°.89 Centig. r + r1 = + 7°.08 « = 0.77 a7 = 0.80 a + a' = 1-57 log B = 9.86119 log */ (B B7) = 9.8061 log B' = 9.75100 Table I. log W = 7.0511 log B — log B7 = 0.11019 log (a + a7) = 0.1959 l°g (^Ba'} . W = 7.4409 D 76 BAROMETRICAL MEASUREMENT OF HEIfiHTS. log [log B — log B'] = 9.04215 In Table I. argt. r + r1 = + 7.08, log V = 4.27164 In Table II. argt. 7.4409, log V7 = 0.00120 In Table III. argt. 46°, log G' = — 0.00004 log (H' — H) = 3.31495 H'— H = 2065.1 metres. In Table IV. — — = 4- 0.9 h' — h= 2066.0 Geneva altitude h = 407.0 St. Bernard above the level of the sea h' = 2473.0 metres. Example 2. Computing the height of Mont Blanc from the observations of Bravais and Martins, on the 29th of August, 1844, taking St. Bernard (2473.0 metres) as the lower sta- tion. The observation gives, B = 568.03 millimetres T = + 7°.6 Centigrade a = 0.59 log B = 9.75437 log B' = 9.62766 log B — log B' = 0.12671 B' = 424.29 millimetres T' = — 9°.l Centig. r + r' = — 1°.5 a' = 0.57 a + a'= 1.16 log VBB' = — 9.6910 Table I. log W = 6.9183 log (a + a') = (a -f- a') *"*"*' . y multiplying each temperature in the first by 7.5 metres, in order to show the value »f that correction in barometrical measurements. D 81 BAROMETRICAL MEASUREMENT OF HEIGHTS. TABLE XI. CORRECTION TO BE APPLIED TO THE HALF-SUMS OF THE TEMPERATURES OF THE AIR, OBSERVED AT GENEVA AND AT THE GREAT ST. BERNARD, TO OBTAIN THE TRUE MEAN TEMPERATURE OF THE AIR BETWEEN THE TWO STATIONS. Correction, in Centigrade Degrees, for Hour. Jan. Feb. March. April. May. June. July. Aug. Sept. Oct. Nov. Dec. Year. o 0 o o o o 0 0 0 o o 0 o Noon. -0.5 -1.7 -3.0 -3.9 -4.1 -4.4 -4.4 -3.8 -2.7 -1.6 -0.4 +0.7 -2.5 2 -0.2 -1.5 -2.8 -3.7 -4.0 -4.4 -4.4 -3.8 -2.6 -1.5 -0.2 +0.7 -2.3 4 +0.4 -0.6 -1.6 -2.5 -2.7 -3.4 -3.6 -2.9 -1.7 -0.7 +0.4 +1.3 -1.5 6 +1.2 +0.7 -0.2 -0.9 -1.3 -2.1 -2.2 -1.6 -0.5 +0.4 +1.3 +2.1 -0.3 8 +1.5 + 1.4 +0.6 0.0 0.0 -0.6 -0.7 -0.5 +0.3 +1.3 + 1.7 +2.6 +0.6 10 +1.7 +1.5 + 1.2 +0.6 +0.7 +0.5 -0.1 +0.1 +0.8 + 1.7 +1.8 +2.6 +1.1 Mid- night. +1.9 +1.8 +1.9 +1.3 +1.8 +1.6 +0.9 +1.2 +1.3 +2.3 +2.1 +2.5 +1.7 2 +2.0 +2.2 +2.5 + 1.9 +2.2 +2.0 +1.5 +2.0 +1.9 +2.5 +2.4 +2.6 +2.2 4 +2.3 +2.5 +2.6 + 1.8 + 1.7 +1.4 +1.1 +1.8 +2.1 +2.5 +2.7 +2.9 +2.1 6 +2.0 +2.0 +1.7 +0.7 +0.4 +0.1 0.0 +0.7 +1.5 + 1.7 +2.3 +2.9 + 1.3 8 +1.5 +1.1 0.0 -1.3 -2.0 -2.2 -2.4 -1.7 -0.4 +0.6 + 1.7 +2.5 -0.3 10 +0.4 -0.4 -2.0 -3.1 -3.5 -3.8 -3.7 -3.1 -2.0 -1.0 +0.3 +1.3 -1.7 Mean, +1.2 +0.8 +0.1 -0.8 -0.9 -1.2 -1.5 -0.9 -0.2 +0.7 +1.3 +2.1 0.0 Correction, in Metres, for Hour. Jan. Feb. March. April. May. June. July. Aug. Sept. Oct. Nov. Dec. Year. Noon. - 3.7 -12.7 -22.5 -29.2 -30.7 -33.0 -33.0 -28.5 -20.2 -12.0 - 3.0 + 5.2 -18.7 2 - 1.5 -11.2 -21.0 -27.7 -30.0 -33.0 -33.0 -28.5 -19.5 -11.2 - 1.5 + 5.2 -17.2 4 + 3.0 - 4.5 -12.0 -18.7 -20.2 -25.5 -27.0 -21.7 -12.7 - 5.2 + 3.0 + 9.7 -11.2 6 + 9.0 + 5.2 - 1.5 - 6.7 - 9.7 -15.7 -16.5 -12.0 - 3.7 + 3.0 + 9.7+15.7 - 2.2 8 +11.2 +10.5 + 4.5 0.0 0.0 - 4.5 - 5.2 - 3.7 + 2.2 + 9.7 +12.7 +19.5 + 4.5 10 +12.7 +11.2 + 9.0 + 4.5 + 5.2 + 3.7 -0.7 + 0.7 + 6.0 +12.7 +13.5 +19.5 + 8.5 Mid- night. +14.5 +13.5 +14.5 + 9.7 +13.5 +12.0 + 6.7 + 9.0 + 9.7 +17.2 +15.7 +18.7 +12.7 2 +15.0 +16.5 +18.7 +14.2 +16.5 +15.0 +11.2 +15.0 +14.2 +18.7 +18,0 +19.5 +16.51 4 +17.2 +18.7 +19.5 +13.5 +12.7 +10.5 + 8.2 +13.5 +15.7 +18.7 +20.2 +21.7 +15.7 6 +15.0 +15.0 +12.7 + 5.2 + 3.0 + 0.7 0.0 + 5.2 +11.2 +12.7 +17.2 +21.7 + 9.7 8 +11.2 + 8.2 0.0 - 9.7 -15.0 -16.5 -18.0 -12.7 - 3.0 + 4.5 +12.7 + 18.7 - 2.2 10 + 3.0 - 3.0 -15.0 -23.2 -26.2 -28.5 -27.7 -23.2 -15.0 - 7.5 + 2.2 + 9.7 -12.7 Mean +9.0 +6.0 +0.7 -6.0 -6.7 -9.0 -11.2 -6.7 -1.5 +5.2 +9.7 +15.7 0.0 D BAROMETRICAL MEASUREMENT OF HEIGHTS. THE elevation of a place in the interior of a continent where regular meteorological observations are made, may be ascertained by taking the yearly means of the ba- rometer reduced to the freezing point, and of the temperature of the air, as data for the upper station, and the yearly means of the reduced barometer and of the free thermometer at the level of the sea, as the data for the lower station. The Hypso- metric Tables then will give the difference of level. As observation, however, has shown that the mean height of the barometer at the level of the sea is not the same in all latitudes, it is necessary to take for such a comparison the mean height of the barometer which belongs to the latitude of the station the elevation of which is to be computed, or that which is nearest to it. Table XII., published by Schouw, in Poggendorf's Annalen, and in the Comptes \Rendus de P Academic des Sciences, Tom. III. p. 573, gives in Paris lines the mean ; height of the barometer in various latitudes. The reduction into millimetres is from Marlins's French translation of Kaemtz's Meteorology, p. 278 ; the correspond- ing values in English inches, and the new stations, Savannah, Ga., Philadelphia, Pa., and Cambridge, Mass., have been added. The mean heights last mentioned have been derived from three years of observations at Savannah, by Dr. John F. Posey, from June, 1853, to June, 1856, published in the American Almanac ; from four years of hourly observations at Girard College, Philadelphia, by Prof. A. D. Bache ; and from ten years of observations at Cambridge Observatory. They have been reduced to a common absolute standard and to mean tide-water at the respective places. These mean barometric heights, corrected for the variation of gravity in latitude, according to the proposition of Poggendorf, by the formula b = b 45 ( 1 — 0.0025935 ijcos 2 <£), where b is the height of the barometer in latitude , and b 45 the corre- sponding height at the forty-fifth degree of latitude, are found in another column. For computing the elevations, the uncorrected heights are to be used. The mean barometric pressure, as shown by Table XIII. from Kaemtz's Precis de Meteorologie, French translation, p. 281, is not the same in all seasons, and the imonthly means differ by a quantity which also varies with the latitude. If, therefore, :he height of an inland station is to be ascertained from the barometrical means of Dne or more months only, the computation must be made with the mean pressure in he corresponding months at the level of the sea ; or if this is not known, the yearly ncans taken from Table XII. must be corrected for the difference between the monthly neans of the given month, or months, and the annual mean in the same latitude, as lerived from the comparison of the numbers in Table XIII. Example. Suppose an inland station, in latitude 40° N. ; the mean barometric pressure for July is 26.30 inches, and its elevation is to be computed from it. Table XII. gives for latitude 40°, at Philadelphia, reduced to the level of the sea, J0.053 inches. Table XIII. gives as the mean for July, at the same place, 759.80 Tiillimetres, and for the year, 760.25 millimetres (both not reduced to the level of he sea), difference — 0.45 millimetres = — 0.017 English inches, which is to be subtracted from the annual mean, 30.053, to reduce it to the mean of July ; or D 83 BAROMETRICAL MEASUREMENT OF HEIGHTS. 30.053 0.017 = 30.036. This last number is to be used in the computation, with the mean temperature of July at both stations. Towards the tropical regions, the irregular or non-periodic variations of the ba- rometer, which in high and middle latitudes are so considerable as to render simul- taneous observations indispensable for the measurement of heights, gradually decrease and nearly cease to exist, while the monthly and daily periodic variations, which are small in high latitudes, considerably increase. Within the tropics, therefore, the oscillations of the barometer being far more uniform, observations made during a short period of time, or even single observations, may be used for computing heights, without corresponding observations, by referring them to the mean pressure at the level of the sea as to a constant, provided this last has been corrected for the monthly and daily periodic variation at the place. Table XIII. furnishes the means of applying the correction for the monthly varia- tion, as described above. Table XIV., which gives the mean height of the barometer at all hours of the day in various latitudes, enables the observer to correct the data according to the hour at which the observations have been taken. This table is from Kaemtz's Vorlesungen uber Meteor ologie, French translation, p. 249. The column Bossekop is from the observations of the French Scientific Expedition in the North ; the column Philadelphia, from the observations at Girard College, has been added. The correction for the hourly variation is found by taking the difference between the mean of the hour of observation and the daily mean, and correcting accordingly, with due regard to the signs, either the yearly mean at the sea level, or the observa- tion at the upper station. Example. The barometer at Caracas, latitude 10° 307 N., on the 20th of August, at 4 o'clock P. M., reads 680.57 millimetres. In Table XII, the mean height of the barometer at La Guayra, lat. 10° N = 760.17 millimetres, By Table XIII. we find for August a correction . . = — 2.95 Mean barometer in August = 757.22 In Table XIV. daily mean — mean at 4 P. M. gives for 4 P. M. a correction = — 1.17 Mean barometer at La Guayra in August, at 4 P. M. = 756.05 millimetres, which is the number to be used for the computation of the height of Caracas. In this case, however, the monthly correction, being derived from a higher latitude, may be too small. Both corrections can of course be applied, with contrary signs, to the observation at Caracas, leaving then the mean height at the level of the sea as constant. 84 I TABLE XII. MEAN HEIGHT OF THE BAROMETER, IN VARIOUS LATITUDES, REDUCED TO THE LEVEL OF THE SEA, AND TO THE FREEZING POINT. Places. Latitude. In Millimetres, In English Inches. In Paris LiDes. Observed. Corrected for Gravity. Observed. Corrected for Gravity. Observed. Corrected for Gravity. o / , Cape of Good Hope, 33 S. 763.01 762.20 30.041 30.008 338.24 337.88 Rio Janeiro, Brazil, 23 S. 764.03 762.65 30.080 30.026 338.69 338.08 Christiansborg, Guinea, 5 SON. 760.10 758.16 29.925 29.850 336.95 336.09 La Guayra, Venezuela, 10 760.17 758.32 29.928 29.855 336.98 336.16 St. Thomas, W. Indies, 19 760.51 758.95 29.942 29.881 33713 336.44 i Macao, China, 23 762.99 761.61 30.040 29.986 338.23 337.62 Teneriffe, Canary Isles, 28 764.21 763.10 30.087 30.044 338.77 338.28 Savannah, Georgia, 32 764.59 763.74 30.102 30.070 338.93 338.57 Funchal, Madeira, 32 30 765.18 764.34 30.126 30.093 339.20 338.83 Tripoli, Northern Africa, 33 767.41 766.60 30.214 30.182 340.19 339.83 Palermo, Sicily, 38 762.95 762.47 30.038 30.019 338.21 338.00 Philadelphia, Penn. 40 763.35 763.00 30.053 30.040 338.88 338.23 Naples, Italy, 41 762.34 762.06 30.014 30.003 337.94 337.82 Cambridge, Mass. 42 762.44 762.24 30.018 30.010 337.99 337.90 Florence, Italy, 43 30 761.93 761.81 29.997 29.993 337.76 337.71 Avignon, France, 44 762.02 761.95 30.001 29.998 337.80 337.77 Bologna, Italy, 44 30 762.18 762.13 30.007 30.005 337.87 337.85 Padua, Italy, 45 762.18 x 762.18 30.007 30.007 337.87 337.87 Paris, France, 49 761.41 ^ 761.68 29.978 29.988 337.53 337.65 London, England, 51 30 760.96 761.41 29.960 29.978 337.33 337.53 Altona, Denmark, 53 30 760.42 761.01 29.938 29.961 337.09 337.35 Dantzig, Prussia, 54 30 760.10 760.76 29.925 29.952 336.95 337.24 Konigsberg, Prussia, 54 30 760.49 761.14 29.941 29.967 337.12 337.41 Apenrade, Denmark, 55 759.58 760.71 29.906 29.950 336.72 337.22 Edinburgh, Scotland, 56 758.25 759.00 29.853 29.882 336.13 336.46 Christiania, Norway, 60 758.64 759.63 29.868 29.908 336.30 336.74 Hardanger, Norway, 60 756.94 757.04 29.801 29.841 335.55 335.99 Bergen, Norway, 60 757.01 758.00 29.804 29.844 335.58 336.02 Reikiavig, Iceland, 64 752.00 753.20 29.607 29.654 333.36 333.89 Godthaab, S. Greenland, 64 751.94 753.13 29.605 29.651 333.33 333.86 Eyafiord, Iceland, 66 753.58 754.89 29.669 29.721 334.06 334.64 Godhavn, Disco, Greenl. 68 753.76 755.16 29.677 29.731 334.14 334.76 Upernavik, N. Greenl. 73 755.18 756.80 29.732 29.796 334.77 335.49 Melville Isl., Arct. Amer, 74 30 757.08 758.75 29.807 29.872 335.61 336.35 Spitzbergen, 75 30 756.76 758.48 29.794 29.862 335.47 336.23 D 85 XIII. MEAN HEIGHT OF THE BAROMETER, IN ALL MONTHS OF THE YEAR, IN VARIOUS LATITUDES. Not reduced to the Level of the Sea. Places, HAVANA. CAL- CUTTA. MACAO. CAIRO. SA- VANNAH. PHILA- DELPHIA. CAM- BRIDGE. PARIS. ST. PE- TE RSHURG Latitude, 23° 9' 22° 33' 22° 11' 30° 2' 32° 5' 39° 58' 42° 23' 48° 50' 59° 56' Jan. 765.24 764.57 767.93 762.40 762.80 760.97 761.37 758.86 762.54 Feb. 760.15 758.86 767.01 it 763.76 759.63 760.90 759.09 763.10 || March, 760.98 756.24 766.08 759.43 763.05 760.51 759.09 756.33 760.76 April, 759.58 753.83 761.93 760.10 763.10 760.05 759.37 755.18 761.19 ] May, 758.19 750.81 761.64 758.23 763.39 759.09 759.63 755.61 760.94 II June, 760.67 748.10 757.31 754.42 764.37 759.22 758.91 757.28 759.83 1 July, 760.67 747.54 757.91 753.90 764.02 759.80 760.34 756.52 758.25 ! Aug. 757.33 748.53 757.91 754.06 765.54 760.54 761.11 756.74 759.94 | Sept. 757.46 751.83 762.22 756.70 763.36 761.25 761.83 756.61 761.19 Oct. 758.19 755.25 763.37 759.70 763.13 760.68 761.07 754.42 760.82 | Nov. 761.25 758.37 766.17 760.76 763.41 760.49 760.85 755.75 758.05 | Dec. 763.62 760.59 768.65 761.82 761.12 760.82 760.80 755.09 760.22 Year, 760.28 754.54 763.18 758.32 763.41 760.25 760.44 756.46 760.57 XIV. MEAN HEIGHT OF THE BAROMETER, AT ALL HOURS OF THE DAY, IN VARIOUS LATITUDES. Not reduced to the Level of the Sea. Places, PACIFIC OCEAN. CUMANA. LA GUAYRA. CAL- CUTTA. PHILADEL- PHIA. PADUA. HALLE. ST. PE- TERSBURG! BOSSEKOP. Latitude^ 0° 0' 10° 28'N. 10° 36'N. 22° 35'N. 39° 58'N. 45° 24'N. 51° 29'N. 59° 56'N. 69° 58'N.! Observers, Homer. Hum- boldt. Boussin- gault. Balfour. Bache, Ciminello. Kaemtz. Kupffer. Bravais. j I Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. | Midnight, 752.47 756.86 759.64 758.80 760.49 757.01 753.23 759.35 754.90 1 1 752.20 756.53 759.34 758.62 760.46 756.90 753.14 tt " 2 751.77 756.21 759.05 758.57 760.41 756.84 753.05 759.32 754.79 3 751.63 755.89 758.81 758.49 760.34 756.78 752.99 it ti 4 751.32 755.66 758.68 758.47 760.39 756.74 752.99 759.32 754.70 5 751.65 755.79 758.85 758.44 760.49 756.75 753.34 u u 6 751.95 756.18 759.32 758.68 760.75 756.79 753.12 759.39 754.68 7 752.48 756.58 759.94 759.16 761.00 756.89 753.24 M K 8 752.95 756.98 760.50 759.88 761.15 757.01 753.37 759.49 754.75 | 9 753.16 757.31 759.63 760.11 761.22 757.08 753.44 (t tt 10 753.15 757.32 760.50 760.19 761.17 757.14 753.46 759.51 754.96 11 752.80 757.01 759.99 760.09 760.97 757.07 753.40 it tt Noon, 752.35 756.57 759.41 759.61 760.56 757.02 753.29 759.47 755.01 ! 1 751.87 755.99 758.91 759.22 760.13 756.85 753.11 tt u 2 751.55 755.47 758.41 758.39 759.83 756.67 752.99 759.38 754.96 3 751.15 755.14 758.12 758.12 759.65 756.54 752.89 t< tt 4 751.02 754.96 758.05 757.91 759.65 756.47 753.84 759.32 754.82 5 751.31 755.14 758.10 757.93 759.70 756.46 752.86 tt it 6 751.71 755.41 758.40 758.01 759.85 756.50 752.91 759.31 754.87 7 751.93 755.81 758.90 758.02 760.08 756.63 753.02 a tt 8 752.35 756.21 759.19 758.54 760.31 756.79 753.14 759.32 754.89 | 9 752.74 756.59 759.69 759.24 760.49 756.92 753.24 tt " 10 752.85 756.87 759.93 759.33 760.59 757.02 753.31 759.36 754.92 11 752.86 757.15 759.98 759.09 760.72 757.02 753.29 it tt Moan, 752.13 756.33 759.22 758.87 760.43 756.83 753.19 759.38 754.85 D 86 BAROMETRICAL MEASUREMENT OF HEIGHTS. TABLE XIV. shows that, after all irregular variations of the barometer have been liminated, there remains a double period of rise and fall within the twenty-four ours, and that the amplitude of these daily oscillations is greatest within the tropics, nd goes on diminishing towards the polar regions. According to Kaemtz, the mean time of the daily maxima and minima, or the lean tropic hours for the northern hemisphere, are as follows : — h. The minimum of the afternoon is reached at 4.05 P. M. The maximum of the evening is reached at 10.11 P. M. The minimum of the night is reached at 3.45 A. M. The maximum of the morning is reached at 9.37 A. M. 'ven in temperate and high latitudes these diurnal variations, though small, must be kken into account, if great accuracy is required, in reducing corresponding obser- ations made at a somewhat different hour to the time of the observation at the ion the height of which is to be determined. But in so doing, it must be remem- red that the tim«s of the minima and maxima change with the seasons, as is shown Table XV. from Kaemtz, p. 251 of the French translation. XV. TROPIC HOURS OF THE DAILY VARIATION OF THE BAROMETER AT HALLE. LAT. 51° 30' N. Month. Minimum, Maximum, P. M. | P. M. Minimum, A.M. Maximum, A. M. Month. Minimum, P.M. Maximum, P. M. Minimum, A.M. Maximum, A.M. h. h. h. h. h. h. h. h. Jan. 2.81 9.17 4.91 9.91 July, 5.21 11.04 3.04 8.73 Feb. 3.43 9.46 3.86 .9.66 Aug. 4.86 10.66 3.06 8.96 March, 3.82 9.80 3.87 10.10 Sept. 4.55 10.45 3.45 9.71 April, 4.46 10.27 3.53 9.53 Oct. 4.17 10.24 3.97 10.07 May, 5.43 10.93 3.03 9.13 Nov. 3.52 9.85 4.68 10.08 June, 5.20 10.93 2.83 8.73 Dec. 3.15 9.11 4.91 10.18 This shifting of the times of maxima and minima with the seasons diminishes with le latitude, and tends to disappear towards the equator, with the inequality of the ays and nights. The elevation above the level of the sea also causes a change in ne tropic hours of the daily variation which is not yet sufficiently studied. Table XIV. gives evidence that the amplitude of the hourly oscillation is greatest nder the equator, and gradually decreases towards the pole. Kaemtz computes its aean value in various latitudes and at the level of the sea, as follows : — XV7. AMPLITUDE OF DAILY VARIATIONS IN VARIOUS LATITUDES. Latitude. Variation. II Latitude. Variation. Latitude. Variation. Latitude Variation. o / Millim. 0 ( Millim. 0 / Millim. 0 I Millim. 0 0 2.28 23 55 1.80 39 4 1.13 52 33 0.45 5 26 N. 2.26 29 28 1.58 43 34 0.90 57 17 0.23 17 52 2.03 34 26 1.35 48 1 0.67 62 25 0.00 The amplitude also decreases with the elevation, at least in our latitudes ; it was bund to be on the Faulhorn, in Switzerland, 9000 feet above the sea level, ).27 millimetres, while it was 0.90 millimetres at Geneva. D 87 TABLES FOR REDUCING BAROMETRICAL OBSERVATIONS TO THE LEVEL OF THE SEA, OR TO ANOTHER LEVEL. To reduce barometric means taken at a given elevation to the height they would have if taken at the level of the sea, or barometric observations made at different ! elevations to a common level, in order to eliminate the influence of altitude in the comparison of barometric pressures, is a problem, the solution of which is often needed in meteorology. For a complete and accurate reduction, embracing all cases, Tables IV. and V., by Dippe, given above, pages 54 et seq., may be used. But when the difference of , height between the two stations, or above the sea-level, does not exceed a few , hundred feet, the small tables XVI. to XIX., in three different scales, will be found more convenient. Tables XVI. and XVII. have been computed from the constants of Laplace's for- : rnula, the barometric coefficient, including the correction for the decrease of gravity ; on a vertical, being respectively 60,345.51 English feet and 56,621.83 Paris feet; and the coefficient for expansion of moist air 0.00222 and 0.005. In Table XVIII. the coefficient 18,420 metres, deduced from Kegnault's experi- ments (see Proceedings of the Amer. Assoc.for Adv. of Science^ 1857), and his co- I efficient for expansion of dry air, 0.003665, increased to 0.0039, in order to include the effect of moisture, have been used. USE OF THE TABLES. The correction for reducing the barometer to the level of the sea is found by the formula C - f x h' -N X A' where C is the correction required ; /, the elevation of the station ; N, the number in the tables ; A', the reading of the barometer ; A, the normal height of barometer at the sea-level. Example. At Cambridge Observatory, Massachusetts, at 71.34 English feet above mean tide, the mean barometer is = 29.939 inches ; the mean temperature 47°.3 Fahrenheit ; what would be the height at the level of the sea ? In Table XVI. we take for 47°. 3 = 90.49, or, in order to get the correction in a fraction of an inch, 904.9. Then r 71.34 29.939 A .„,_. = 904T9 X ~~30~~ = °-079> correction required ; and 29.939 + 0.079 = 30.018 inches, height of the barometer at the level of the sea. It will be seen that the quantity represented by the second member can be neg- lected without causing a sensible error in the correction. In this case the error docs not amount to .001 ; it scarcely would reach .002 for 250 feet of elevation ; so that the reduction can be made in most cases by a simple division ; viz. £ D 88 VI. HEIGHT, IN ENGLISH FEET, OF A COLUMN OF AIR CORRESPONDING TO A TENTH OF AN ENGLISH INCH IN THE BAROMETER, AT TEMPERATURES BETWEEN 32° AND 100° FAHRENHEIT, The Barometric Pressure at the Lower Station being = 30 English Inches. Temper- ature of Air, Fahren Height in English Feet. Temper- ature of Air, Fahren. Height in English Feet. Temper- ature of Air, Fahren. Height in English Feet. Temper- ature of Air, Fahren. Height in English Feet. Temper- ature of Air, Fahren. Height in English Feet. 32° 87.51 46° 90.23 60° 92.95 74° 95.67 87° 98.20 33 87.70 47 90.42 61 93.15 75 95.87 88 98.40 34 87.90 48 90.62 62 93.34 76 96.06 89 98.59 35 88.09 49 90.81 63 93.53 77 96.26 90 98.79 36 88.28 50 91.01 64 93.73 78 96.45 91 98.98 37 88.48 51 91.20 65 93.92 79 96.65 92 99.17 38 88.67 52 91.40 66 94.12 80 96.84 93 99.37 39 88.87 53 91.59 67 94.31 81 97.04 94 99.56 40 89.06 54 91.78 68 94.51 82 97.23 95 99.76 41 89.26 55 91.98 69 94.70 83 97.42 96 99.95 42 89.45 56 92.17 70 94.90 84 97.62 97 100.15 43 89.65 57 92.37 71 95.09 85 97.81 98 100.34 44 89.84 58 92.56 72 95.29 86 98.01 99 100.54 45 90.03 59 92.76 73 95.48 87 98.20 100 100.73 XVII. HEIGHT, IN FRENCH FEET, OF A COLUMN OF AIR CORRESPONDING TO A PARIS LINE IN THE BAROMETER, AT TEMPERATURES OF THE AIR BETWEEN 0° AND 34° REAUMUR, The Barometric Pressure at the Lower Station being = 337 Paris Lines. Temper- ature of Air, Reaumur. Height in French Feet. Temper- ature of Air, Reaumur. Height in French Feet. Temper- ature of Air, Reaumur. Height in French Feet. Temper- ature of Air, Reaumur. Height in French Feet. Temper- ature of Air, Reaumur. Height in French Feet 0° 73.08 7° 75.63 14° 78.19 21° 80.75 28° 83.31 1 73.44 8 76.00 15 78.56 22 81.11 29 83.67 2 73.81 9 76.36 16 78.92 23 81.48 30 84.04 3 74.17 10 76.73 17 79.29 24 81.85 31 84.40 4 74.54 11 77.10 18 79.65 25 82.21 32 84.77 5 74.90 12 77.46 19 80.02 26 82.58 33 85.13 6 75.27 13 77.83 20 80.38 27 82.94 34 85.50 XVIII. HEIGHT, IN METRES, OF A COLUMN OF AIR CORRESPONDING TO A MILLIMETRE IN THE BAROMETER, AT TEMPERATURES BETWEEN 0° AND 39° CENTIGRADE, The Barometric Pressure at the Lower Station being = 760 Millimetres. Temper- ature of Air, Centigr Height in Metres. Temper- ature of Air, Centigr. Height in Metres. Temper- ature of Air, Centigr. Height in Metres. Temper- ature of Air, Centigr. Height in Metres. Temper- ature of Air, Centigr. Height in Metres. 0° 10.54 8° 10.86 16° 11.19 24° 11.52 32° 11.85 1 10.58 9 10.91 17 11.23 25 11.56 33 11.89 2 10.62 10 10.95 18 11.28 26 11.60 34 11.93 3 10.66 11 10.99 19 11.32 27 11.64 35 11.97 4 10.70 12 11.03 20 11.36 28 11.69 36 12.01 5 10.74 13 11.07 21 11.40 29 11.73 37 12.06 6 10.78 14 11.11 22 11.44 30 11.77 38 12.10 7 10.82 15 11.15 23 11.48 31 11.81 39 12.14 BAROMETRICAL MEASUREMENT OF HEIGHTS. Table XIX. gives, in metrical measure, the values of a millimetre in the barom-; eter at different elevations and Centigrade temperatures. The values are derived from Laplace's constants, as in Tables XVI. and XVII. This table may be used, as the preceding ones, for reducing barometrical obser- vations to the level of the sea, and also to any other level by a similar process. Example. Suppose the barometer to read 700 millimetres at the altitude of 750 metres, the temperature of air being = 16° Centigrade ; what would be the reading at a station lower by 350 metres, assuming the temperature of the air downwards to increase at the rate of 1° Centigrade for 185 metres ? The temperature of air at lower station will be 16° + l°-9 = 17° .9 The approximate height of barometer about 73 centimetres. Then, in Table XIX. we find for 16° and 70 centimetres, 12.15 « " " for 17°.9 and 73 centimetres, 11.73 Mean 11.94 And -35.0- = 29.31, or barometer at lower station 700 + 29.31 = 729.31 millimetres. ll.t/4: * Delcros's tables, with these data, would give for the difference of level 349.76, instead of 350 metres ; the corresponding error in the height of the barometrical column does not exceed 0.08 millimetre, and thus remains within the limits of error which may be expected in an ordinary observation. The principal object of this table, however, is to furnish the scientific traveller with the means of readily computing on the spot approximate differences of level, by simply multiplying the difference between the readings of the barometer at each station by the half sum of the numbers in the table corresponding to the data given by the observations. Example. Suppose the barometer at the lower station to read 732.5, and at the upper station 703.2 millimetres ; the temperature -of the air being respectively 18° and 16° Centi- grade. The difference of the barometers, supposed to be reduced to the same temperature, is 29.3 millimetres. Then, Table XIX. gives for 18° Centigrade and 73 centimetres, 11.73 " " for 16° Centigrade and 70 centimetres, 12.15 Half sum, or mean, 11.94 And, 29.3 X 11.94 = 349.8 metres = difference of level required. By the large tables of Delcros, we find for the same data 350.1 metres. This table can be considered as a complement to Delcros's tables, and may save the traveller the trouble of carrying the larger tables. A similar table in English measures is found above, at the end of the author's larger tables (Table VI.), page 48 of this series, and another, more extensive one, below, page 92, the use of which is explained by the examples just given. D 90 XIX. HEIGHT, IN METRES, OF A COLUMN OF AIR, CORRESPONDING TO A MILLIMETRE IN THE BAROMETER, AT DIFFERENT TEMPERATURES AND ELEVATIONS. Temper- Barometer at the Lower Station, Reading in Centimetres. ature of Air, Centig. 76 75 74 73 72 71 70 69 68 67 0 Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. 0 10.52 10.66 10.80 10.94 11.10 11.26 11.42 11.59 11.75 11.93 2 10.60 10.74 10.89 11.03 11.19 11.35 11.51 11.68 11.85 12.03 4 10.69 10.83 10.97 11.12 11.28 11.44 11.60 11.77 11.94 12.13 6 10.77 10.91 11.06 11.20 11.37 11.53 11.69 11.86 12.04 12.22 8 10.85 11.00 11.15 11.29 11.46 11.62 11.78 11.96 12.13 12.32 10 10.94 11.08 11.23 11.38 11.55 11.71 11.87 12.05 12.22 12.41 12 11.02 11.17 11.32 11.47 11.63 11.80 11.97 12.14 12.32 12.51 14 11.11 11.25 11.41 11.55 11.72 11.89 12.06 12.23 12.41 12.60 16 11.19 11.34 11.49 11.64 11.81 11.98 12.15 12.33 12.51 12.70 18 11.27 11.43 11.58 11.73 11.90 12.07 12.24 12.42 12.60 12.79 20 11.36 11.51 11.67 11.82 11.99 12.16 12.33 12.51 12.69 12.89 22 11.44 11.60 11.75 11.90 12.08 12.25 12.42 12.61 12.79 12.99 24 11.53 11.68 11.84 11.99 12.17 12.34 12.51 12.70 12.88 13.08 26 11.61 11.77 11.93 12.08 12.26 12.43 12.61 12.79 12.98 13.18 28 11.70 11.85 12.01 12.17 12.35 12.52 12.70 12.88 13.07 13.27 30 11.78 11.94 12.10 12.25 12.43 12.61 12.79 12.98 13.16 13.37 32 11.86 12.02 12.18 12.34 12.52 12.70 12.88 13.07 13.26 13.46 34 11.95 12.11 12.27 12.43 12.61 12.79 12.97 13.16 13.35 13.56 36 12.03 12.19 12.36 12.52 12.70 12.88 13.06 13.25 13.45 13.65 38 12.12 12.28 12.44 12.60 12.79 12.97 13.15 13.35 13.54 13.75 Barometer in Centimetres. Teuiper- fttUT£ Of Air, Centig. 66 65 64 63 62 61 6O 59 58 w 0 Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. .0 12.11 12.30 12.49 12.69 12.89 13.10 13.32 13.55 13.78 14.03 2 12.21 12.40 12.59 12.79 13.00 13.21 13.43 13.66 13.89 14.14 4 12.31 12.50 12.69 12.89 13.10 13.31 13.54 13.77 14.00 14.25 6 12.40 12.60 12.79 13.00 13.20 13.42 13.64 13.88 14.11 14-36 8 12.50 12.69 12.89 13.10 13.31 13.52 13.75 13.98 14.22 14.47 10 12.60 12.79 12.99 13.20 13.41 13.63 13.86 14.09 14.34 14.59 12 12.69 12.89 13.09 13.30 13.51 13.73 13.96 14.20 14.45 14.70 14 12.79 12.99 13.19 13.40 13.62 13.84 14.07 14.31 14.56 14.81 16 12.89 13.09 13.29 13 50 13.72 13.94 14.18 14.42 14.67 14.92 IS 12.98 13.19 13.39 13.61 13.82 14.05 14.28 14.53 14.78 15,04 20 13.08 13.28 13.49 13.71 13.93 14.15 14.39 14.63 14.89 15.15 22 13.18 13.38 13.59 13.81 14.03 14.26 14.50 14.74 15.00 15.26 24 13.27 13.48 13.69 13.91 14.13 14.36 14.60 14.85 15.11 15.37 2t3 13.37 13.58 13.79 14.01 14.24 14.47 14.71 14.96 15.22 15.48 28 13.47 13.68 13.89 14.11 14.34 14.57 14.82 15.07 15.33 15.60 30 13.57 13.78 13.99 14.22 14.44 14.68 14.92 15.18 15.44 15.71 32 13.66 13.87 14.09 14.32 14.55 14.78 15.03 15.28 15.55 15.82 34 13.76 13.97 14.19 14.44 14.65 14.89 15.14 15.39 15.66 15.93 38 13.86 14.07 14.29 14.52 14.75 14.99 15.24 15.50 15.77 16.05 D 91 XIX7. HEIGHT, IN ENGLISH FEET, OF A COLUMN OF AIR, CORRESPONDING TO A TENTH OF AN INCH IN THE BAROMETER, AT DIFFERENT TEMPERATURES AND ELEVATIONS. Baromete Reading in English Inches. Temperature of the Air, Fahrenheit, being 4O° 45° 50° 55° 60° 65° 70° 75° §0° 85° 9O° 95° 22.0 121.5 122.8 124.2 125.5 126.8 128.2 129.5 130.8 132.1 133.5 134.8 136.1 22.2 120.4 121.7 123.1 1244 125.7 127.0 128.3 129.6 130.9 132.2 133.6 134.9 22.4 119.3 120.6 121.9 123.2 124.6 125.9 127.2 128.5 129.8 131.1 132.4 133.7 22.6 118.2 119.5 120.8 122.1 123.4 124.7 126.0 127.3 128.6 129.9 131.2 132.4 22.8 117.2 118.5 119.8 121.1 122.3 123.6 124.9 126.2 127.5 128.8 130.0 131.3 23.0 116.2 117.5 118.7 120.0 121.3 122.6 123.8 125.1 126.4 127.6 129.9 130.2 23.2 115.2 116.5 117.7 119.0 120.2 121.5 122.7 124.0 125.3 126.5 127.8 129.0 23.4 114.2 115.5 116.7 118.0 119.2 120.5 121.7 123.0 124.2 125.4 126.7 127.9 23.6 1132 114.4 115.7 116.9 118.1 119.4 120.6 121.8 123.1 124.3 125.5 126.8 23.8 112.3 113.5 114.8 116.0 117.2 118.4 119.7 120.9 122.1 123.3 124.6 125.8 24.0 111.4 112.6 113.8 115.0 116.2 117.4 118.7 119.9 121.1 122.3 123.5 124.7 24.2 110.5 111.7 112.9 114.1 115.3 116.5 117.7 118.9 120.1 121.3 122.5 123.7 24.4 109.5 110.7 111.9 113.1 114.3 115.5 116.7 117.9 119.1 120.3 121.5 122.7 24.6 108.6 109.8 111.0 112.2 113.4 114.6 115.8 116.9 118.1 119.3 120.5 121.7 24.8 107.8 108.9 110.1 111.3 112.5 113.7 114.8 116.0 117.2 118.4 119.5 120.7 25.0 106.9 108.1 109.2 110.4 111.6 112.7 113.9 115.1 116.2 117.4 118.6 119.7 25.2 106.0 107.2 108.4 109.5 110.7 111.8 113.0 114.1 115.3 116.5 117.6 118.8 25.4 105.2 106.4 107.5 108.7 109.8 111.0 112.1 113.3 114.4 115.6 116.7 117.9 25.6 104.4 105.5 106.7 107.8 108.9 110.1 111.2 112.4 113.5 114.6 115.8 116.9 25.8 103.6 104.7 105.8 107.0 108.1 109.2 110.4 111.5 112.6 113.8 114.9 116.0 26.0 102.8 103.9 105.0 106.1 107.3 108.4 109.5 110.6 111.8 112.9 114.0 115.1 26.2 102.0 103.1 104.2 105.3 106.5 107.6 108.7 109.8 110.9 112.0 113.1 114.2 26.4 101.2 102.3 103.4 104.6 105.7 106.8 107.9 109.0 110.1 111.2 112.3 113.4 26.6 100.5 101.6 102.7 103.8 104.9 106.0 107.1 108.2 109.3 110.4 111.4 112.5 26.8 99.7 100.8 101.9 103.0 104.1 105.2 106.3 107.4 108.5 109.5 110.6 111.7 27.0 99.0 100.1 101.2 102.2 103.3 104.4 105.5 106.6 107.6 108.7 109.8 110.9 27.2 98.3 99.3 100.4 101.5 102.6 103.6 104.7 105.8 106.8 107.9 109.0 110.1 27.4 97.5 98.6 99.7 100.7 101.8 102.9 103.9 105.0 106.1 107.1 108.2 109.3 27.13 96.8 97.9 98.9 100.0 101.1 102.1 103.2 104.2 105.3 106.3 107.4 108.5 27.8 96.1 97.2 98.2 99.3 100.3 101.4 102.4 103.5 104.5 105.6 106.6 107.7 28.0 95.4 96.5 97.5 98.6 99.6 100.6 101.7 102.7 103.8 104.8 105.9 106.9 28.2 94.8 95.8 96.8 97.9 98.9 99.9 101.0 102.0 103.0 104.1 105.1 106.1 28.4 94.1 95.1 96.1 97.2 98.2 99.2 100.2 101.3 102.3 103.3 104.3 105.4 28-6 93.4 94.4 95.5 96.5 97.5 98.5 99.5 100.6 101.6 102.6 103.6 104.6 28.8 92.8 93.8 94.8 95.8 96.8 97.8 98.8 99.8 1C0.8 101.8 102.8 103.8 29.0 '32.1 93.1 94.1 95.1 96.2 97.2 98.2 99.2 100.2 101.2 102.2 103.2 29.2 91.5 92.5 93.5 94.5 95.5 96.5 97.5 98.5 99.5 100.5 101.5 102.5 29.4 9Q.9 91.9 92.9 93.9 94.8 95.8 96.8 97.8 98.8 99.8 100.8 101.8 29.6 90.3 91.3 92.2 93.2 94.2 95.2 96.2 97.2 98.2 99.1 100.1 101.1 29.3 89.7 90.6 91.6 92.6 93.6 94.5 95.5 96.5 97.5 98.5 j 99.4 100.4 30.0 89.1 90.0 91.0 92.0 92.9 93.9 94.9 95.9 96.8 97.8 98.8 99.7 30.2 88.5 89.4 90.4 91.4 92.3 93.3 94.3 95.2 96.2 97.2 98.1 99.1 30.4 87.9 88.8 89.8 90.8 91.7 92.7 93.6 94.6 95.6 96.5 97.5 98.4 REDUCING TO THE TRUE MEAN BAROMETRIC PRESSURE. WHEN the Barometrical means to be used have been derived from observations taken at such hours of the day as, if combined, do not give the true mean pressure, they must be reduced to the true means by using the Tables XX. and XXI. These tables give the corrections to be applied to the hourly means, in each month, for reducing them to the means which would have been given by observations made at each of the twenty-four hours. The correction for any given set of hours is found by taking the mean of the corrections due to each of the combined hours, paying ue attention to the signs. Table XX. has been computed from the hourly obser- ations made under the superintendence of Professor A. D. Bache, at Girard College, 'hiladelphia. Table XXI. is from the Greenwich Observations, by Glaisher. XX. NORTH AMERICA. — PHILADELPHIA. Lat. 39° 58' N. Long. 75° 11' W. Greenw. Corrections to be applied to the Means of the Hours of Observation to obtain the true Mean Barometric Pressure of the respective Days, Months, and of the Year. Barometer in English Inches. Hour. Jan. Feb. March. April. May. June. July. Aug. Sept. Oct. Nov. Dec. Year. Inch. Inch. Inch. Inch. Inch Inch. Inch. Inch. Inch. Inch. Inch. Inch. Inch. Midnight. +.002 -.009 -.007 -.004 -.002 +.003 -.007 -.003 -.002 +.007 +.003 -.010 -.0024 1 +.001 -.007 -.002 -.001 +.003 +.007 +.001 -.001 +.005 +.007 +.007 -.011 +.0007 2 -.007 -.003 -.001 +.006 +.007 +.010 +.004 +.004 +.010 +.011 +.011 -.016 +.0030 3 -.008 +.002 +.009 +.005 +.007 +.007 +.003 +.005 +.009 +.011 +.007 -.014 +.0036 4 -.003 +.003 +.009 +.002 +.003 +.002 .000 +.004 +.005 +.007 +.003 -.010 +.0038 5 -.003 .000 +.002 -.007 -.006 -.007 -.010 -.005 -.006 -.003 -.006 -.008 -.0050 6 -.009 -.004 -.011 -.020 -.019 -.022 -.019 -.017 -.016 -.012 -.012 -.015 -.0147 7 -.021 -.013 -.020 -.029 -.026 -.024 -.025 -.023 -.023 -.021 -.019 -.023 -.0222 8 -.032 -.023 -.028 -.034 -.031 -.029 -.028 -.026 -.029 -.030 -.028 -.029 -.0290 9 -.040 -.026 -.028 -.035 -.028 -.027 -.027 -.033 -.031 -.029 -.034 -.030 -.0307 10 -.041 -.026 -.025 -.033 -.024 -.025 -.026 -.030 -.029 -.026 -.038 -.032 -.0296 11 -.023 -.019 -.016 -.023 -.018 -.019 -.019 -.022 -.021 -.014 -.017 -.011 -.0185 Noon. +.006 -.004 -.002 -.008 -.006 -.010 -.012 -.012 -.009 +.001 + .006 +.005 -.0037 1 +.028 +.017 +.014 +.006 +.005 .000 .000 .000 +.005 +.006 +.023 +.024 +.0107 2 +.037 +.032 +.031 +.021 +.017 +.011 +.011 +.012 +.020 +.028 +.033 +.034 +.0240 3 +.034 +.034 +.034 +.034 +.028 +.019 +.020 + .022 + .024 +.028 +.033 +.034 +.0287 4 +.031 +.032 +.034 +.042 +.032 +.027 +.027 +.027 +.030 +.028 +.027 +.030 +.0306 5 +.024 +.024 +.025 +.036 +.034 +.030 +.028 +.029 +.027 +.021 +.018 +.026 +.0267 6 +.015 +.014 +.016 +.031 +.027 +.023 +.028 +.028 +.023 +.012 +.005 +.021 +.0202 7 +.003 +.006 +.007 + .022 +.016 +.018 +.021 +.018 +.016 +.001 -.002 +.018 +.0123 8 +.003 .000 -.003 +.009 +.002 +.010 +.014 +.008 +.007 -.009 -.006 + .013 +.0040 9 -.002 -.008 -.010 +.001 -.010 .000 +.003 +.003 -.001 -.013 -.007j+.0l2 -.0027 10 -.003 -.012 -.011 -.003 -.018 -.003 -.004 -.001 -.005 -.016 -.010! +.003 -.0065 11 +.002 -.011 -.017 -.010 -.019 -.005 -.002 -.002 -.004 -.009 -.003 +.005 -.0064 6, 2, 10 +.008 +.005 +.003 -.001 -.007 -.005 -.004 -.002 .000 .000 +.004 +.009 + .001 7,2,9 +.008 +.004 .000 -.002 -.006 -.004 -.004 -.003 -.001 -.002 +.002 +.008 .000 M2, 3,9 .000 -.001 -.001 -.002 -.004 -.004 -.004 -.004 -.004 -.003 -.001 +.003 - .002 D 93 XXI. ENGLAND. — GREENWICH. Lett. 51° 29' N. ; Long. 0° 0'. Corrections to be applied to the Means of the Hours of Observation, or Sets of Hours, to obtain the true Mean Barometric Pressure for the respective Months. — GLAISHER. English Inches. Hours. Jan. Feb. March April. May. June. July. Aug. Sept. Oct. Nov. Dec. Mean. Inch. Inch. Inch. Inch. Inch. Inch. Inch Inch. Inch. Inch. Inch. Inch. Inch. Midn. . . .000 -.001 -.002 -.008 -.005 .000 -.006 -.010 -.005 -.005 -.011 -.004 -.005 1 .001 .004 .013 .000 .002 .004 .000 .000 .000 .004 -.005 .001 .002 2 .002 .008 .020 .007 .004 .005 .003 .007 .005 .010 .003 .006 .007 3 .005 .012 .023 .010 .005 .004 .005 .011 .010 .015 .008 .010 .009 4 .011 .014 .022 .011 .005 .001 .005 .014 .012 .020 .013 .012 .012 5 .015 .015 .019 .011 .006 -.002 .006 .011 .014 .022 .016 .014 .012 6 .015 .012 .012 .006 .006 -.006 .002 .005 .010 .018 .015 .011 .009 7 .010 .007 .005 -.003 .006 -.010 -.004 .000 .001 .008 .010 .006 .003 8 .003 .000 -.004 -.008 .003 -.012 -.008 -.007 -.006 -.003 .003 .004 -.003 9 -.008 -.008 -.010 -.011 -.007 -.012 -.010 -.008 -.011 -.009 -.005 -.010 -.009 10 -.010 -.015 -.015 -.014 -.009 -.011 -.010 -.009 -.013 -.014 -.007 -.015 -.012 11 -.014 -.016 -.015 -.011 -.006 -.009 -.009 -.008 -.010 -.014 -.005 -.015 -.011 Noon. . . -.005 -.012 -.010 -.008 -.002 -.006 -.006 -.005 -.005 -.010 .002 -.009 -.006 1 .002 -.006 -.005 -.004 .000 -.003 -.003 .000 .000 -.003 .007 .003 -.001 2 .005 .003 .000 .003 .003 .003 .001 .003 .004 .004 •Oil .008 .004 3 .004 .006 003 .009 .006 .007 .005 .005 .008 .005 .010 .010 .006 4 .002 .008 .005 .004 .010 .013 .009 .009 .010 .003 .008 .009 .007 5 .000 .006 .004 .014 .014 .017 .013 .011 .011 .000 .004 .006 .008 6 -.003 .002 .000 .011 .015 .017 .013 .011 .006 -.005 .000 .002 .006 7 -.005 -.004 -.006 -.007 .010 .014 .010 .005 .000 -.008 -.006 -.003 .000 8 -.006 -.006 -.012 -.005 .000 .008 .004 -.005 -.005 -.011 -.012 -.006 -.005 9 -.007 -.008 -.015 -.009 -.006 .003 -.001 -.010 -.009 -.014 -.017 -.019 -.008 10 -.005 -.007 -.012 -.012 -.008 -.002 -.005 -.015 -.011 -.012 -.019 -.010 -.010 11 -.004 -.005 -.010 -.012 -.008 -.002 -.012 -.015 -.011 -.009 -.017 -.009 -.009 6. 6 .006 .007 .006 .008 .011 .005 .008 .008 .008 .006 .007 .006 .008 7. 7 .002 .002 .000 -.005 .008 .002 .003 .002 .000 .000 .002 .002 .001 8. 8 -.002 -.003 -.008 -.006 .002 -.002 -.002 -.006 -.006 -.007 -.004 -.001 -.004 9 9 -.007 -.008 -.013 -.010 -.006 -.004 -.005 -.009 -.010 -.012 -.011 -.009 -.009 10.10 -.007 -.011 -.014 -.013 -.009 -.006 -.007 -.012 -.012 -.013 -.013 -.012 -.011 7. 2. 9 .003 .001 -.003 -.003 .001 -.001 -.001 -.002 -.001 -.001 .001 .002 .001 6. 2. 8 .005 .003 .000 .001 .003 .002 .002 .001 .003 .004 .005 .004 .003 6. 2.10 .005 .003 .000 -.001 .000 -.002 -.001 -.002 .001 .003 .002 .003 .001 6. 2. 6 .006 .006 .004 .007 .008 -.005 .005 .006 .007 .006 .009 .007 .006 7. 2 .007 .005 .003 .000 .004 -.004 -.001 .002 .002 .006 .010 .007 .003 8. 2 .004 .002 -.002 -.002 .003 -.004 -.003 -.002 -.001 .000 .007 .006 .001 8. 1 .002 -.003 -.004 -.006 .001 -.007 -.006 -.003 -.003 -.003 .005 .003 -.002 7. 1 .006 .001 .000 -.003 .003 -.006 -.003 .000 .000 .002 .008 .004 .001 9.12.3.9 -.004 -.005 -.008 -.005 -.002 -.002 -.003 -.004 -.004 -.007 -.002 -.004 -.004 The numbers without sign must be added : those with the sign — must be subtracted. 94 I BAROMETRICAL MEASUREMENT OF HEIGHTS. XXII. TABLE TO REDUCE, BY INTERPOLATION, THE OBSERVATIONS TO THE SAME ABSOLUTE TIME. DECIMALS OF AN HOUR. Min. Decimal. Min. Decimal. Min. Decimal. Min. Decimal. Min. Decimal. Min. Decimal. 1 .017 11 .183 21 .350 31 .517 41 .683 51 .850 2 .033 12 .200 22 .367 32 .533 42 .700 52 .867 3 .050 13 .217 23 .383 33 .550 43 .717 53 .883 4 .067 14 .233 24 .400 34 .567 44 .733 54 .900 5 ,083 15 .250 25 .417 35 .583 45 .750 55 .917 6 .100 16 .267 26 .433 36 .600 46 .767 56 .933 7 .117 17 .283 27 .450 37 .617 47 .783 57 .950 8 .133 18 .300 28 .467 38 .633 48 .800 58 .967 9 .150 19 .317 29 .483 39 .650 49 .817 59 .983 10 .167 20 .333 30 .500 40 .667 50 .833 60 1000 TABLE FOR CORRECTION OF CURVATURE AND REFRACTION. From a mountain, when furnished with a barometer, or with an apparatus for de- ermining the temperature of boiling water, and a pocket level, an observer can ind the elevations of distant points, which are in sight, but lower than the mountain tself on which he stands. He has only to seek, with the level, the point on the lope of the mountain which corresponds to the point at a distance that he wishes to etermine, and to take there a barometrical, or a boiling point observation. This bservation is to be calculated in the usual way, but the result must be corrected for curvature of the surface of the globe, and for the atmospheric refraction, by leans of the following Table. This method, which furnishes the means of multiplying, without much trouble, le measurements of heights, gives approximations which are sufficient for most f the purposes of Physical Geography. It may even seem preferable to direct leasurements for determining the mean elevation of certain physical lines, which re best estimated when seen from a distance ; such as the upper limit of the rowth of trees, the limits of different kinds of vegetation, that of permanent snow, lat of the mean elevation of the crest of a mountain range, &c. Table XXIII. is taken from Captain LEE'S Collection of Tables and Formula, d edit., page 81. D 95 XXIII. CORRECTIONS FOR CURVATURE AND REFRACTION. Showing the Difference of the Apparent and True Level, in feet and decimals, for Distances in feet and mile* Distances in Feet. Correction in Feet. Distances in Miles Correction in Feet. For Cur- vature. For Re- fraction. For Curva- ture and Refraction. For Cur- vature. For Re- fraction. For Curva- ture and Refraction. 100 .00024 .00004 .00020 , .0417 .0060 .0357 150 .00054 .00008 .00046 1 .1668 .0238 .1430 200 .00094 .00013 .00083 j 4 .3752 .0536 .3216 250 .00149 .00021 .00128 1 .6670 .0953 .5717 300 .00215 .00031 .00184 il 1.5008 .2144 1.2864 350 .00293 .00042 .00251 2 2.6680 .3811 2.2869 400 .00383 .00055 .00328 2s 4.1688 .5955 3.5733 450 .00484 .00069 .00415 3 6.0030 .8561 5.1469 500 .00598 .00085 .00513 N 8.1708 1.1673 7.0035 550 .00724 .00103 .00621 4 10.6720 1.5246 9.1474 600 .00861 .00123 .00738 41 13.5468 1.9295 11.5773 650 .01010 .00144 .00866 5 16.6750 2.3821 14.2929 700 .01172 .00167 .01005 51 20.1769 2.8824 17.2945 750 .01345 .00192 .01153 6 24.0120 3.4303 20.5817 800 .01531 .00219 .01312 ti 28.1809 4.0258 24.1551 850 .01728 .00247 .01481 7 32.6830 4.6690 28.0143 900 .01938 .00277 .01661 71 37.5190 5.3599 32.1591 950 .02159 .00308 .01851 8 42.6880 6.0997 36.5883 1000 .02392 .00333 .02059 81 48.1910 6.8844 41.3066 1050 .02638 .00377 .02261 9 54.0270 7.7181 46.3089 1100 .02895 .00414 .02481 91 60.1971 8.5996 51.5975 1150 .03164 .00452 .02712 10 66.7000 9.5286 57.1714 1200 .03445 .00492 .02953 11 80.7070 11.5296 69.1774 1250 .03738 .00534 .03204 12 96.0480 13.7211 82.3269 1300 .04043 .00578 .03465 13 112.7230 16.1033 96.6197 1350 .04361 .00623 .03738 14 130.7320 18.6760 112.0560 1400 .04689 .00670 .04019 15 150.0750 21.4393 128.6357 1450 .05030 .00719 .04311 16 170.7520 24.3931 146.3589 1500 .05383 .00769 .04614 17 192.7630 27.5376 165.2254 1550 .05748 .00821 .04927 18 216.1086 30.8727 185.2359 1600 .06125 .00875 .05250 19 240.7870 34.3981 206.3889 1650 .06514 .00931 .05583 20 266.8000 38.1143 228.6857 1700 .06914 .00988 .05926 1750 .07327 .01047 .06280 1800 .07752 .01107 .06645 1850 .08188 .01170 .07018 1900 .08637 .01234 .07403 1950 .09098 .01300 .07798 2000 .09570 .01367 .08203 96 I THERMOMETRICAL MEASUREMENT OF HEIGHTS, TABLES FOR DEDUCING DIFFERENCES OF LEVEL FROM OBSERVATIONS OF THE TEMPERATURE OF BOILING WATER. 95' I THERMOMETRICAL MEASUREMENT OF HEIGHTS. TABLES FOR DEDUCING DIFFERENCES OF LEVEL FROM THE TEMPERATURE OF THE BOILING POINT OF WATER. WHEN water is heated in the open air, the elastic force of the vapors produced from it gradually increases, until it becomes equal to the incumbent weight of the atmosphere. Then, the pressure of the atmosphere being overcome, the steam escapes rapidly in large bubbles, and the water boils. The temperature at which, in the open air, water boils, thus depends upon the weight of the atmospheric col- umn above it, and under a less barometric pressure the water will boil at a lower temperature than under a greater pressure. Now, as the weight of the atmosphere decreases with the elevation, it is obvious that, in ascending a mountain, the higher the station where an observation is taken, the lower the temperature at which water boils at that station will be. The difference of elevation between two places, therefore, can be deduced from the temperature of boiling water observed at each station. It is only necessary to find the barometric pressures which correspond to those temperatures, and, the at- mospheric pressures at both places being known, to compute the difference of level by a formula, or by the tables given above for computing heights from barometrical observations. From the above, it may be seen that the heights determined by means of the tem- perature of boiling water are less reliable than those deduced from barometrical observations. Both derive the difference of altitude from the difference of atmos- pheric pressure. But the temperature of boiling water gives only indirectly the atmospheric pressure, which is given directly by the barometer. This method is thus liable to all the chances of error which may affect the measurements by means of the barometer, besides adding to them new ones peculiar to itself, the principal of which, not to speak of the differences exhibited in the various tables of the force of vapor, is the difficulty of ascertaining with the necessary accuracy the true temperature of boiling water. In the present state of thermometry it would hardly be safe, indeed, to answer, in the most favorable circumstances, for quantities so small as hundredths of degrees, even when the thermometer has been constructed with the utmost care ; moreover, the quality of the glass of the instrument, the form and the substance of the vessel containing the water, the nature of the water itself, the place at which the bulb of the thermometer is placed, whether in the current of steanror in the water, — all these circumstances cause no inconsiderable variations to take place in the indications of thermometers observed under the same atmospheric D 96' THERMOMETRICAL MEASUREMENT OF HEIGHTS. >ressure. Owing to these various causes, an observation of the boiling point, differ- ng by one tenth of a degree from the true temperature, ought to be still admitted as i good one. Now, as the tables show, an error of one tenth of a degree Centigrade n the temperature of boiling water would cause an error of 2 millimetres in the Barometric pressure, or of from 70 to 80 feet in the final result, while with a good •arometer the error of pressure will hardly ever exceed one tenth of a millimetre, naking a difference of 3 feet in altitude. Notwithstanding these imperfections, the hypsometric thermometer, or thermo- rometer, is of the greatest utility to travellers traversing distant or rough countries, account of its being more conveniently transported, and much less liable to idents than the mercurial barometer. The best form for it is that contrived and ribed by Regnault in the Annales de Cliimie et de Physique, Tom. XIV. p. 202. consists of an accurate thermometer with long degrees, subdivided into tenths, whose Ib is placed, about 2 or 3 centimetres above the surface of the water, in the steam ing from distilled water in a cylindrical vessel, the water being made to boil by a irit-lamp. The whole instrument when closed is about 6 inches long ; when drawn t for observation, about 14 inches. Table XXIV. of barometric pressures corresponding to temperatures of boiling ,ter, has been calculated by Regnault from his Tables of Forces of Vapor, and blished in the Annales de Chimie et de Physique, Tom. XIV. p. 206. It gives, in illimetres of mercury, the barometric pressures corresponding to every tenth of a ntigrade degree ; for greater convenience, the values for every hundredth have n added. The accuracy of this table has been tested by direct observation by Mr. -Wisse, a .veller competent in such matters, who noted down simultaneously the tempera- Ires of the boiling point of water and the height of the barometer, in various parts ' the Andes, up to the summit of the volcano of Pichincha, including in his obser- itions barometrical pressures ranging from 752 to 430 millimetres of mercury, ihe agreement between the barometric pressures given here by Regnault and those und by Wisse are very satisfactory, the differences never exceeding a few tenths a millimetre. See Annales de Chimie et de Physique, Tom. XXVIII. p. 123. Table XXV. is the same table, revised by A. Moritz, who, in a communication to Academic des Sciences, in October, 1856, called the attention to some slight rs of computation in Regnault's table, and gave the corrected numbers for every e degree from 40° to 102° Centigrade. Those numbers are given here from upwards, as published in the Journal de TInstitut ; the values for every tenth of legree, and their differences, have been computed to fit the table for practical use. ic comparison of the two tables will show that the corrections mostly amount to a hundredths, and never exceed one tenth of a millimetre. Table XXVI. is table XXV. reduced to English measures. D 97 XXIV. BAROMETRIC PRESSURES CORRESPONDING TO TEMPERATURES OF BOILING WATER. Centig. Degrees. Hundredths of a Degree. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. o Millim. Millim. Millim. Millim. Millim Millim. Millim. Millim. Millim. Millim. 85.0 433.04 433.21 433.38 433.55 433.72 433.89 434.07 434.24 434.41 434.58 85.1 434.75 434.92 435.09 435.26 435.43 435.60 435.78 435.95 436.12 436.29 85.2 436.46 436.63 436.80 436.97 437.14 437.31 437.49 437.66 437.83 438.00 85.3 433.17 438.34 438.51 438.69 438.86 439.03 439.20 439.37 439.55 439.72 85.4 439.89 440.06 440.23 440.41 440.58 440.75 440.93 441.10 441.27 441.45 85.5 441.62 441.79 441.97 442.14 442.31 442.48 442.66 442.83 443.00 443.18 85.6 443.35 443.52 443.70 443.87 444.05 444.22 444.39 44457 444.74 444.92 85.7 445.09 445.26 445.44 445.61 445.79 445.96 446.14 446.31 446.49 446.67 85.8 446.84 447.01 447.19 447.36 447.54 447.71 447.89 448.06 448.24 448.41 85.9 448.59 448.76 448.94 449.11 449.29 449.46 449.64 449.81 449.99 450.16 86.0 450.34 450.52 450.69 450.87 451.04 451.22 451.40 451.57 451.75 451.92 86.1 452.10 452.28 452.45 452.63 452.81 452.98 453.16 453.34 453.52 453.69 86.2 453.87 454.05 454.22 454.40 454.58 454.75 454.93 455.11 455.29 455.46 86.3 455.64 455.82 456.00 456.17 456.35 456.53 456.71 456.89 457.06 457.24 86.4 457.42 457.60 457.78 457.96 458.14 458.31 458.49 458.67 458.85 459.03 86.5 459.21 459.39 459.57 459.75 459.93 460.10 460.28 460.46 460.64 460.82 86.6 461.00 461.18 461.36 461.54 461.72 461.90 462.08 462.26 462.44 462.62 86.7 462.80 46298 463.16 463.34 463.52 463.70 463.88 464.06 464.24 464.42 86.8 464.60 464.78 464.96 465.14 465.32 465.50 465.69 465.87 466.05 466.23 86.9 ^466.41 466.59 466.77 466.95 467.13 467.31 467.50 467.68 467.86 468.04 87.0 468.22 468.40 468.58 468.77 468.95 469.13 469.31 469.49 469.68 469.86 87.1 470.04 470.22 470.41 470.59 470.77 470.95 471.14 471.32 471.50 471.69 87.2 471.87 472.05 472.24 472.42 472.60 472.78 472.97 473.15 473.33 473.52 87.3 473.70 473.88 474.07 474.25 474.44 474.62 474.80 474.99 475.17 475.36 87.4 475.54 475.72 475.91 476.09 476.28 476.46 476.64 476.83 477.01 477.20 87.5 477.38 477.56 477.75 477.93 478.12 478.30 478.49 478.67 478.86 479.04 87.6 479.-2S 479.41 479.60 479.78 479.97 480.15 480.34 480.52 480.71 480.89 87.7 481.08 481.27 481.45 481.64 481.82 482.01 482.20 482.38 482.57 482.75 87.8 482.94 483.13 483.31 483.50 483.69 483.87 484.06 484.25 484.44 484.62 87.9 484.81 485.00 485.19 485.37 485.56 485.75 485.94 486.13 486.31 486.50 88.0 486.69 486.88 487.07 487.25 487.44 487.63 487.82 488.01 488.19 488.38 88.1 488.57 488.76 488.95 489.13 489.32 489.51 489.70 489.89 490.07 490.26 88.2 490.45 490.64 490.83 491.02 491.21 491.39 491.58 491.77 491.96 492.15 88.3 492.34 492.53 492.72 492.91 493.10 493.29 493.48 493.67 493.86 494.05 88.4 494.24 494.43 494.62 494.81 495.00 495.19 495.39 495.58 495.77 495.96 88.5 496.15 496.34 496.53 496.72 496.91 497.10 497.30 497.49 497.68 497.87 88.6 498.06 498.25 498.44 498.64 498.83 499.02 499.21 499.40 499.60 499.79 88.7 499.98 500.17 500.36 500.56 500.75 500.94 501.13 501.32 501.52 501.71 88.8 501.90 502.09 502.28 502.48 502.67 502.86 503.05 503.24 503.44 503.63 88.9 503.82 504.01 504.21 504.40 504.60 504.79 504.98 505.18 505.37 505.57 Tk 0. 1. 2. 3. 4. 5. 6. »• 8. 9. 98 BAROMETRIC PRESSURES CORRESPONDING TO TEMPERATURES OF BOILING WATE5 Hundredths of a Degree. Centig. Degrees. 0. 1. 2. 3. 4. f. 6. 7. 8. 9. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 89.0 505.76 505.95 506.15 506.34 506.54 506.73 506.92 507.12 507.31 507.51 89.1 507.70 507.89 508.09 508.28 508.48 508.67 508.87 509.06 509.26 509.45 89.2 509.65 509.84 510.04 510.23 510.43 510.62 510.82 511.01 511.21 511.40 89.3 511.60 511.80 511.99 512.19 512.38 512.58 512.78 512.97 513.17 513.36 89.4 513.56 513.76 513.95 514.15 514.35 514.54 514.74 514.94 515.14 515.33 89.5 515.53 515.73 515.92 516.12 516.32 516.51 516.71 516.91 517.11 517.30 89.6 517.50 517.70 517.90 518.09 518.29 518.49 518.69 518.89 519.08 519.28 89.7 519.48 519.68 519.88 520.07 520.27 520.47 520.67 520.87 521.06 521.26 89.8 521.46 521.66 521.86 522.06 522.26 522.46 522.66 522.86 523.05 523.25 89.9 523.45 523.65 523.85 524.05 524.25 524.45 524.65 524.85 525.05 525.25 90.0 525.45 525.65 525.85 526.05 526.25 526.45 526.65 526.85 527.05 527.25 90.1 527.45 527.65 527.85 528.05 528.25 528.45 528.66 528.86 529.06 529.26 90.2 529.46 529.66 529.86 530.07 530.27 530.47 530.67 530.87 531.08 531.28 90.3 531.48 531.68 531.88 532.09 532.29 532.49 532.69 532.89 533.10 533.30 90.4 533.50 533.70 533.91 534.11 534.31 534.51 534.72 534.92 535.12 535.33 90.5 535.53 535.73 535.94 536.14 536.35 536.55 536.75 536.96 537.16 537.37 90.6 537.57 537.77 537.98 538.18 538.39 538.59 538.79 539.00 539.20 539.41 90.7 539.61 539.81 540.02 540.22 540.43 540.63 540.84 541.04 541.25 541.45 90.8 541.66 541.87 542.07 542.28 542.48 542.69 542.90 543.10 543.31 543.51 90.9 543.72 543.93 544.13 544.34 544.54 544.75 544.96 545.16 545.37 545.57 91.0 545.78 545.99 546.19 546.40 546.61 546.81 547.03 547.23 547.44 547.64 91.1 547.85 548.06 548.26 548.47 548.68 548.88 549.09 549.30 549.51 549.71 91.2 549.92 550.13 550.34 550.54 550.75 550.96 551.17 551.38 551.58 551.79 91.3 552.00 552.21 552.42 552.63 552.84 553.04 553.25 553.46 553.67 553.88 91.4 554.09 554.30 554.51 554.72 554.93 555.14 555.35 555.56 555.77 555.98 91.5 556.19 556.40 556.61 556.82 557.03 557.24 557.45 557.66 557.87 558.08 91.6 558.29 558.50 558.71 558.92 559.13 559.34 559.55 559.76 559.97 560.18 91.7 560.39 560.60 560.81 561.03 561.24 561.45 561.66 561.87 562.09 562.30 91.8 562.51 562.72 562.93 563.15 563.36 563.57 563.78 563.99 564.21 564.42 91.9 564.63 564.86 565.06 565.27 565.48 565.69 565.91 566.12 566.33 566.55 92.0 566.76 566.97 567.19 567.40 567.61 567.85 568.04 568.25 568.46 568 JS8 I 92.1 568.89 569.10 569.32 569.53 569.75 569.96 570.17 570.39 570.60 570.82 1 92.2 571.03 571.24 571.46 571.67 571.89 572.10 572.32 572.53 572.75 572.96 92.3 573.18 573.40 573.61 573.83 574.04 574.26 574.48 574.69 574.91 575.12 92.4 575.34 575.56 575.77 575.99 576.20 576-42 576.64 576.85 577.07 577*2S> 92.5 577.50 577.72 577.93 578.15 578.37 578.58 578.80 579.02 579.24 5.79.43 92.6 579.67 579.89 580.10 580.32 580.54 580.75 580.97 581.19 581.41 581.62 92.7 581.84 582.06 582.28 582.49 582.71 582.93 583.15 583.37 583.58 583.80 92.8 584.02 584.24 584.46 584.68 584.90 585.11 585.33 585.55 585,77 585.99 92.9 586.21 586.43 586.65 586.87 587.09 587.31 587.53 587.75 587.97 588.19 0. 1. 2. 9. 4. 5. 6. 7. 8. 9. 99 BAROMETBIC PRESSURES CORRESPONDING TO TEMPERATURES OF BOILING WATER. Humlredths of a Degree. Centig. Degrees. o. 1. 2. 3. 4. 5. 6. •7. 8. 9. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 93.0 588.41 588.63 588.85 589.07 589.29 589.51 589.73 589.95 590.17 590.39 93.1 590.61 590.83 591.05 591.27 591.49 591.71 591.94 592.16 592.38 592.60 93.2 592.82 593.04 593.26 593.49 593.71 593.93 594.15 594.37 594.60 594.82 93.3 595.04 595.26 595.48 595.71 595.93 596.15 596.37 59659 596.82 597.04 93.4 597.26 597.48 597.71 597.93 598.15 598.37 598.60 598.82 599.04 599.27 93.5 599.49 599.71 599.94 600.16 600.38 600.60 600.83 601.05 601.27 601.50 93.6 601.72 601.94 602.17 602.39 602.62 602.84 603.07 603.29 603.52 603.74 93.7 603.97 604.19 604.42 604.64 604.87 605.09 605.32 605.54 605.77 605.99 93.8 606.22 606.45 606.67 606.90 607.12 607.35 607.58 607.80 608.03 608.25 93.9 608.48 608.71 608.93 609.16 609.38 609.61 609.84 610.06 610.29 610.51 94.0 610.74 610.97 611.19 611.42 611.65 611.87 €12.10 €12.33 612.56 612.78 94.1 613.01 613.24 613.47 613.69 613.92 614.15 614.38 614.61 614.83 615.06 94.2 615.29 615.52 615.75 615.97 616.21 616.43 €16.66 616.89 617.12 617.35 94.3 617.58 617.81 €18.04 618.27 618.50 618.72 618.95 619.18 619.41 619.64 94.4 619.87 620.10 €20.33 620.56 620.79 621.02 621.25 621.48 621.71 621.94 94.5 622.17 622.40 €22.€3 622.86 623.09 623.32 623.56 623.79 €24.02 624.25 94.6 624.48 624.71 €24.94 625.17 625.40 625.63 625.87 626.10 626.33 626.56 94.7 626.79 627.02 627.25 627.49 627.72 627.95 628.18 628.41 628.65 628.88 94.8 629.11 629.34 629.58 629.81 630.04 630.27 630.51 630.74 630.97 631.21 94.9 631.44 631.67 631.91 632.14 632.38 632.61 632.84 633.08 633.31 633.55 95.0 633.78 634.01 634.25 634.48 634.72 634.95 635.18 635.42 635.65 635.89 95.1 €36.12 636.35 636.59 636.82 637.06 637.29 637.53 637.76 638.00 638.23 95.2 €38.47 638.71 638.94 639.18 639.41 639.65 639.89 640.12 640.36 640.59 95.3 €40.83 641.07 641.30 641.54 641.77 642.01 642.25 642-48 642.72 642.95 95.4 €43.19 643.43 643.67 643.90 644.14 644.38 644.62 644.86 645.09 €45.33 95.5 645.57 €45.81 646.05 646.28 €46.52 646.76 647.00 647.24 647.47 647.71 95.6 647.95 €48.19 648.43 648.67 648.91 649.14 649.38 649.62 649.86 650.10 95.7 650.34 €50.58 650.82 651.06 651.30 651.53 651.77 652.01 652.25 652.49 95.8 652.73 €52.57 653.21 653.45 653.69 653.93 654.17 654.41 654.65 654.89 95.9 655.13 €55.37 655.61 655.85 656.09 656.33 656.58 656.82 657.06 657.30 96.0 €57.54 €57.78 658.02 658.26 658.50 658.74 658.99 659.23 659.47 659.71 96.1 €59.95 660.19 €60.43 660.68 660.92 661.16 661.40 661.64 661.89 662.13 96.2 662.37 €€2.61 €62.86 663.10 663.34 663.58 663.83 664.07 664.31 664.56 96.3 664.80 665.04 665.29 665.53 665.78 666.02 666.26 666.51 666.75 667.00 96.4 667.24 667.48 667.73 €67.97 668.22 668.46 668.71 668.95 669.20 669.44 96.5 669.69 669.93 670.18 670.42 670.67 670.91 671.16 671.40 671.65 671.99 96.6 672.14 672.39 672.63 €72.88 673.12 673.37 673.62 673.86 674.11 674.35 96.7 674.60 674.85 675.09 €75.34 675.59 675.83 676.08 676.33 676.58 676.82 96.8 677.07 677.32 677.57 €77.81 678.06 678.31 678.56 678.81 679.05 679.30 96.9 679.55 679.80 680.05 680.29 680.54 680.79 681.04 681.29 681.53 681.78 0. 1. 2. 3. 4. 5. 6. 7. §. 0. u 100 4 BAROMETRIC PRESSURES CORRESPONDING TO TEMPERATURES OF BOILING WATER. Hundredths of a Degree. Centig. Degrees. 0. 1. 2. 3. 4. 5. 6. 7. §. 9. o Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. Millim. 97.0 682.03 682.28 682.53 682.78 683.03 683.27 683.52 683.77 684.02 684.27 97.1 684.52 684.77 685.02 685.27 685.52 685.77 686.02 686.27 686.52 686.77 97.2 687.02 687.27 687.52 687.77 688.02 688.27 688.53 688.78 689.03 689.28 97.3 689.53 689.78 690.03 690.28 690.53 690.78 691.04 691.29 691.54 691.79 97.4 692.04 692.29 692.54 692.80 693.05 693.30 693.55 693.80 694.06 694.31 97.5 694.56 694.81 695.06 695.32 695.57 695.82 696.07 696.32 696.58 696.83 97.6 697.08 697.33 697.59 697.84 698.09 698.34 698.60 698.85 699.10 699.36 97.7 699.61 699.86 700.12 700.37 700.63 700.88 701.13 701.39 701.64 701.90 97.8 702.15 702.40 702.66 702.91 703.17 703.42 703.68 703.93 704.19 704.44 97.9 704.70 704.96 705.21 705.47 705.72 705.98 706.24 706.49 706.75 707.00 98.0 707.26 707.52 707.77 708.03 708.28 708.54 708.80 709.05 709.31 709.56 98.1 709.82 710.08 710.33 710.59 710.85 711.10 711.36 711.62 711.88 712.13 98.2 712.39 712.65 712.91 713.16 713.42 713.68 713.94 714.20 714.45 714.71 98.3 714.97 715.22 715.49 715.75 716.01 716.26 716.52 716.78 717.04 717.30 98.4 717.56 717.82 718.08 718.34 718.60 718.85 719.11 719.37 719.63 719.89 98.5 720.15 720.41 720.67 720.93 721.19 721.45 721.71 721.97 722.23 722.49 98.6 722.75 723.01 723.27 723.53 723.79 724.05 724.31 724.57 724.83 725.09 98.7 725.35 725.61 725.87 726.13 726.39 726.65 726.92 727.18 727.44 727.70 98.8 727.96 728.22 728.48 728.75 729.01 729.27 729.53 729.79 730.06 730.32 98.9 730.58 730.84 731.11 731.37 731.63 731.89 732.16 732.42 732.68 732.95 99.0 733.21 733.47 733.74 734.00 734.27 734.53 734.79 735.06 735.32 735.59 99.1 735.85 736.11 736.38 736.64 736.91 737.17 737.44 737.70 737.97 738.23 99.2 738.50 738.77 739.03 739.30 739.56 739.83 740.10 740.36 740.63 740.89 99.3 741.16 741.43 741.69 741.96 742.23 742.49 742.76 743.03 743.30 743.56 99.4 743.83 744.10 744.36 744.63 744.90 745.16 745.43 745.70 745.97 746.23 99.5 746.50 746.77 747.04 747.30 747.57 747.84 748.11 748.38 748.64 748.91 99.6 749.18 749.45 749.72 749.99 750.26 750.52 750.79 751.06 751.33 751.60 99.7 751.87 752.14 752.41 752.68 752.95 753.22 753.49 753.76 754.03 754.30 99.8 754.57 754.84 755.11 755.38 755.65 755.92 756.20 756.47 756.74 757.01 99.9 757.28 757.55 757.82 758.10 758.37 758.64 758.91 759.18 759.46 759.73 100.0 760.00 760.27 760.55 760.82 761.09 761.36 761.64 761.91 762.18 762.46 100.1 762.73 763.00 763.28 763.55 763.82 764.09 764.37 764.64 764.91 765.19 100.2 765.46 765.73 766.01 766.28 766.56 766.83 767.10 767.38 767.65 767.93 100.3 768.20 768.47 768.75 769.02 769.30 769.57 769.85 770.12 770.40 770.67 100.4 770.95 771.23 771.50 771.78 772.05 772.33 772.61 772.88 773.16 773.43 100.5 773.71 773.99 774.26 774.54 774.82 775.09 775.37 775.65 775.93 776.20 100.6 776.48 776.76 777.04 777.31 777.59 777.87 778.15 778.43 778.70 778.98 100.7 779.26 779.54 779.82 780.09 780.37 780.65 780.93 781.21 781.48 781.76 100.8 782.04 782.32 782.60 782.88 783.16 783.43 783.71 783.99 784.27 784.55 100.9 784.83 785.11 785.39 785.67 785.95 786.23 786.51 786.79 787.07 787.35 101.0 787.63 787.91 788.19 788.47 788.75 789.03 789.31 789.59 789.87 790.15 0. 1. 2. 3. 4. 5. 6. 7. §. 9. D 101 TABLE XXV. BAROMETRIC PRESSURES CORRESPONDING TO TEMPERATURES OF THE BOILING POINT OF WATER, EXPRESSED IN MILLIMETRES OF MERCURY FOR CENTIGRADE TEMPERATURES. Br REGNAULT, BEVISED BY MOEITZ. Boiling Point, Centigrade Barometer in Millimetres. Differ- ence. Boiling Point, Centigrade. Barometer in Millimetres. Differ- ence. Boiling Point, Centigrade Barometer in Millimetres. Differ- ence. 0 80.0 354.62 0 83.0 400.07 o 86.0 450.30 80.1 856.06 1.44 83.1 401.66 1.60 86.1 452.06 1.76 S0.2 357.50 1.45 83.2 403.26 1.60 86.2 453.83 1.77 80.3 358.96 1.45 83.3 404.87 1.61 86.3 455.60 1.77 80.4 360.41 1.46 83.4 406.48 1.61 86.4 457.38 1.78 1.46 1.6-2 1.78 80.5 361.87 83.5 408.10 86.5 459.17 80.6 363.34 1.47 83.6 409.72 1.62 86.6 460.96 1.79 80.7 364.81 1.47 83.7 411.35 1.63 86.7 462.75 1.80 80.8 366.29 1.48 83.8 412.98 1.63 86.8 464.55 1.80 80.9 367.77 1.48 1.49 83.9 414.62 1.64 1.64 86.9 466.36 1.61 1.81 81.0 369.26 84.0 416.26 87.0 468.17 81.1 370.75 1.49 84.1 417.91 1.65 87.1 469.99 1.82 81.2 372.25 1.50 84.2 419.57 1.66 87.2 471.82 1.83 81.3 373.75 1.50 84.3 421.23 1.66 87.3 473.65 1.83 81.4 375.25 1.51 84.4 422.89 1.67 87.4 475.49 1.84 1.51 1.67 1.84 81.5 376.77 84.5 424.56 87.5 477.33 81.6 378.28 1.52 84.6 426.24 1.68 87.6 479.18 1.85 81.7 379.81 1.52 84.7 427.92 1.68 87.7 481.04 1.86 81.8 381.33 1.53 84.8 429.61 1.69 87.8 482.90 1.86 81.9 382.87 1.53 1.54 84.9 431.30 1.69 1.70 87.9 484.76 1.87 1.87 82.0 384.40 85.0 433.00 88.0 486.64 82.1 385.95 1.54 85.1 434.71 1.70 88.1 488.52 1.88 82.8 387.49 1.55 85.2 436.42 1.71 88.2 490.40 1.89 32.3 389.05 1.55 85.3 438.13 1.72 88.3 492.29 1.89 82.4 390.61 1.56 1.56 85.4 439.85 1.72 1.73 88.4 494.19 1.90 1.90 82.5 392.17 85.5 441.58 88.5 496.09 82.6 82.7 82.8 82.9 83.0 -• 393.74 395.31 396.89 398.48 400.07 ===== 1.57 1.57 1.58 1.58 1.59 - 85.6 85.7 85.8 85.9 86.0 443.31 445.05 446.80 448.55 450.30 - 1.73 1.74 1.74 1.75 1.76 — 88.6 88.7 88.8 88.9 89.0 498.00 500.92 501.84 503.77 505.70 1.91 1.92 1.92 1.93 1.93 102 BAROMETRIC PRESSURES CORRESPONDING TO THE BOILING POINT. Boiling Point, Centigrade. Barometer in Millimetres. Differ- ence. Boiling Point, Centigrade. Barometer in Millimetres. Differ- ence. Boiling Point, Centigrade. Barometer in Millimetres. Differ- ence. o 89.0 505.70 o 93.0 588.33 97.0 681.93 1.94 2.20 2«49 89.1 507.65 93.1 590.53 97.1 684.42 89.2 509.59 1.95 93.2 592.74 S.21 97.2 686.92 2.50 1.95 2.22 2.51 89.3 511.54 93.3 594.96 97.3 689.42 1.96 2.22 2.51 89.4 513.50 93.4 597.18 97.4 691.94 1.97 2.23 2.52 89.5 515.47 93.5 599.41 97.5 694.46 89.6 517.44 1.97 93.6 601.65 2.24 97.6 696.98 2.53 89.7 519.42 1.98 93.7 603.89 2.24 97.7 699.52 2.54 89.8 521.40 1.9S 93.8 606.14 2.25 97.8 702.06 2.54 1.99 2.26 2.55 89.9 523.39 93.9 608.40 97.9 704.62 2.00 2.26 2.56 90.0 525.39 94.0 610.66 98.0 707.17 2.00 2.27 2.57 90.1 527.40 94.1 612-93 98.1 709.74 90.2 529.41 2.01 94.2 615.21 2.28 98.2 712.31 2.57 90.3 531.42 2.02 94.3 617.50 2.29 98.3 714.90 2.58 90.4 533.44 2.02 94.4 619.79 2.29 98.4 717.49 2.59 2.03 2.30 2.60 90.5 535.47 94.5 622.09 98.5 720.08 90.6 537.51 2.04 94.6 624.39 2.31 98.6 722.69 2.61 2.04 2.31 2.61 90.7 539.55 94.7 626.71 98.7 725.30 90.8 541.60 2.05 94.8 629.93 2.32 98.8 727.93 2.62 90.9 543.65 2.05 94.9 631.36 2.33 98.9 730.55 2.63 2.06 2.33 2.64 91.0 545.71 95.0 633.69 99.0 733.19 91.1 547.78 2.07 95.1 636.03 2.34 99.1 735.84 2.64 91.2 549.86 2.07 95.2 638.38 2.35 99.2 738.49 2.65 91.3 551.94 2.08 95.3 640.74 2.36 99.3 741.15 2.66 2.09 2.36 2.67 91.4 554.03 95.4 643.10 99.4 743.82 2.09 2.37 2.68 91.5 556.12 95.5 645.48 99.5 746.50 2. 10 2.38 2.68 91.6 558.22 95.6 647.86 99.6 749.18 2.1 1 2.39 2.69 91.7 560.33 95.7 650.24 99.7 751.87 2.11 2.39 2.70 91.8 562.44 95.8 652.63 99.8 754.57 91.9 564.56 2.12 95.9 655.04 2.40 99.9 757.28 2.71 2.13 2.41 2.72 92.0 566.69 96.0 657.44 100.0 760.00 92.1 568.82 2.13 96.1 659.86 2.42 100.1 762.73 2.73 2.14 2.42 2 73 92.2 570.96 96.2 662.28 100.2 765.46 2.15 2.43 2.74 92.3 573.11 96.3 664.71 100.3 768.20 92.4 575.27 2.15 96.4 667.15 2.44 100.4 770.95 2.75 2.16 2.44 2.76 92.5 577.43 96.5 669.59 100.5 773.71 92.6 579.59 2.17 96.6 672.05 2.45 100.6 776.47 2.77 92.7 581.77 2.17 96.7 674.51 2.46 100.7 779.25 2.77 2. 18 2.47 27ft 92.8 583.95 96.8 676.97 100.8 782.03 • lO 92.9 586.14 2.19 96.9 679.45 2.47 100.9 784.82 2.79 93.0 588.33 2.19 97.0 681.93 2.48 101.0 787.62 2.80 D 103 TABLE XXVI. BAROMETRIC PRESSURES CORRESPONDING TO TEMPERATURES OF THE BOILING POINT OF WATER, EXPRESSED IN ENGLISH INCHES FOR TEMPERATURES OF FAHRENHEIT. REDUCED FROM REGNAUM'S TABLE, REVISED BY MOBTTZ. Boiling Point, Fakren. Barom- eter in English Inches. Differ- ence. Boiling Point, Fahren. Barom- eter in English Inches. Differ- ence. Boiling Point, Fahren. Barom- eter in English Inches. Differ- ence. Boiling Point, Fahren Barom- eter in English Inches. Differ- ence. O 185.0 17.048 o 188.0 18.195 0 191.0 19.407 194.0 20.685 185.1 17.085 0.037 188.1 18.235 0.039 191.1 19.448 0.042 194.1 20.729 0.044 185.2 17.122 .037 188.2 18.274 .039 191.2 19.490 .042 194.2 20.773 .044 1S5.3 17.160 .037 188.3 18.314 .039 191.3 19.532 .042 194.3 20.817 .044 185.4 17.197 .037 188.4 18.353 .040 191.4 19.573 .042 194.4 20.861 .044 .038 .040 .042 .044 185.5 17.235 188.5 18.393 191.5 19.615 194.5 20.905 1S5.6 17.272 .038 188.6 18.432 .040 191.6 19.657 .042 194.6 20.949 .044 185.7 17.310 .038 188.7 18.472 .040 191.7 19.699 .042 194.7 20.993 .044 185.8 17.348 .038 188.8 18.512 .040 191.8 19.741 .042 194.8 21.038 .044 185.9 17.385 .038 188.9 18.552 .040 191.9 19.783 .042 194.9 21.082 .044 .038 .040 .042 • .044 186.0 17.423 189.0 18.592 192.0 19.825 195.0 21.126 186.1 17.461 .028 189.1 18.632 .040 192.1 19.868 .042 195.1 21.171 .045 186.2 17.499 .038 189.2 18.672 .040 192.2 19.910 .042 195.2 21.216 .045 1S6.3 17.537 .038 189.3 18.712 .040 192.3 19.952 .042 195.3 21.260 .045 186.4 17.575 .038 189.4 18.753 .040 192.4 19.995 .042 195.4 21.305 .045 .038 .040 .043 .045 136.5 17.614 189.5 18.793 192.5 20.037 195.5 21.350 1S6.6 17.652 •038 189.6 18.833 .040 192.6 20.080 .043 195.6 21.395 .045 186.7 17.690 .038 189.7 18.874 .040 192.7 20.123 .043 195.7 21.440 .045 186.8 17.729 .038 189.8 18.914 .041 192.8 20.166 .043 195.8 21.485 .045 1S6.9 17.767 .038 189.9 18.955 .041 192.9 20.208 .043 195.9 21.530 .045 .039 .041 .043 .045 187.0 17.806 190.0 18.996 193.0 20.251 196.0 21.576 187.1 17.844 .039 190.1 19.036 .041 193.1 20.294 .043 196.1 21.621 .045 1S7.2 17.883 •039 190.2 19.077 .041 193.2 20.338 .043 196.2 21.666 .045 187.3 17.922 .039 190.3 19.118 .041 193.3 20.381 .043 196.3 21.712 .046 187.4 17.961 .039 190.4 19.159 .041 193.4 20.424 .043 196.4 21.758 .046 .039 .041 .043 .046 187.5 18.000 Aon 190.5 19.200 193.5 20.467 196.5 21.803 187.6 187.7 18.039 18.078 • Uo£f .039 mo 190.6 190.7 19.241 19.283 .041 .041 193,6 193.7 20.511 20.554 .043 .043 196.6 196.7 21.849 21.895 .046 .046 187.8 18.117 •U«$y 039 190.8 19.324 .041 193.8 20.598 .044 196.8 21.941 .046 187.9 188.0 18.156 18.195 0.039 190.9 191.0 19.365 19.407 .041 0.041 193.9 194.0 20.641 20.685 .044 0.044 196.9 197.0 21.987 22.033 .046 0.046 D 104 BAROMETRIC PRESSURES CORRESPONDING TO THE BOILING POINT. Barom- Barom- Barom- Barom- Boiling Point, Fahren. eter in English Differ- ence. Boiling Point, Fahren. eter in English Differ- ence. Boiling Point, Fahren. eter in English Differ- ence. Boiling Point, Fahren. eter in English Differ- ence. Inches. Inches. Inches. Inches. o 197.0 22.033 201.0 23.943 205.0 25.990 209.0 28.180 197.1 22.079 0.046 201.1 23.993 0.049 205.1 26.043 0.053 209.1 28.237 0.057 197.2 22.125 .046 201.2 24.042 .060 205.2 26.096 .053 209.2 28.293 .057 .046 .050 .053 .057 197.3 22.172 201.3 24.092 205.3 26.149 209.3 28.350 .046 .050 .053 .057 197.4 22.218 201.4 24.142 205.4 26202 209.4 28.407 .046 .050 .053 .057 197.5 22.264 201.5 24.191 205.5 26.255 209.5 28.464 197.6 22.311 .047 201.6 24.241 .050 205.6 26.309 .053 209.6 28.521 .057 197.7 22.358 .047 201.7 24.291 .050 205.7 26.362 .054 209.7 28.579 .057 197.8 22.404 .047 201.8 24.341 .050 205.8 26.416 .054 209.8 28.636 .057 197.9 22.451 .047 201.9 24.391 .050 205.9 26.470 .054 209.9 28.693 .057 .047 .050 .054 .058 198.0 22.498 202.0 24.442 206.0 26.523 210.0 28.751 198.1 22.545 .047 202.1 24.492 .050 206.1 26.577 .054 210.1 28.809 .058 198.2 22.592 .047 202.2 24.542 .050 206.2 26.631 .054 210.2 28.866 .058 198.3 22.639 .047 202.3 24.593 .050 206.3 26.685 .054 210.3 28.924 .058 198.4 22.686 .047 202.4 24.644 .051 206.4 26.740 .054 210.4 28.982 .058 .047 .051 .054 .058 198.5 22.734 202.5 24.694 206.5 26.794 210.5 29.040 198.6 22.781 •047 202.6 24.745 .051 206.6 26.848 .054 210.6 29.098 .058 198.7 22.829 .047 202.7 24.796 .051 206.7 26.903 .054 210.7 29.156 .058 .048 .051 • 055 AiQ 198.8 22.876 202.8 24.847 206.8 26.957 210.8 29.215 • U0O 198.9 22.924 .043 202.9 24.898 .051 206.9 27.012 .C55 210.9 29.273 .058 .048 .051 .055 ,059 199.0 22.971 203.0 24.949 207.0 27.066 211.0 29.331 199.1 23.019 .048 203.1 25.000 .051 207.1 27.121 .055 211.1 29.390 .059 .048 •051 .055 199.2 23.067 203.2 25.051 207.2 27.176 211.2 29.449 .048 .051 .055 .059 199.3 23.115 203.3 25.103 207.3 27.231 211.3 29.508 199.4 23.163 .048 203.4 25.154 .051 207.4 27.286 .055 211.4 29.566 .059 .043 .052 .055 .059 199.5 23.211 203.5 25.206 207.5 27.341 2H.5 29.625 199.6 23.259 .048 203.6 25.257 .052 207.6 27.397 .055 211.6 29.684 .Q59 199.7 23.308 .048 203.7 25.309 .052 207.7 27.452 .055 211.7 29.744 .059 199.8 23.356 .048 203.8 25.361 .052 207.8 27.507 .055 211.8 29.803 .059 199.9 23.405 .048 203.9 25.413 .05-2 207.9 27.563 .056 211.9 29.862 .059 .049 .052 .056 .059 200.0 23.453 204.0 25.465 208.0 27.618 212.0 29.922 200.1 23.502 .049 204.1 25.517 .052 208.1 27.674 .056 212.1 29.981 .060 200.2 23.550 .049 204.2 25.569 .052 208.2 27.730 .056 212.2 30.041 .060 200.3 23.599 .049 204.3 25.621 .052 208.3 27.786 .056 212.3 30.101 .060 200.4 23.648 .049 204.4 25.674 .052 208.4 27.842 .056 212.4 30.161 .060 .049 .052 .056 .060 200.5 23.697 204.5 25.726 208.5 27.898 212.5 30.221 .049 .053 .056 200.6 23.746 204.6 25.779 208.6 27.954 212.6 30.281 •UoU 200.7 23.795 .049 204.7 25.831 .053 208.7 28.011 .056 212.7 30.341 .060 200.8 23.845 .049 204.8 25.884 .053 208.8 28.067 .056 212.8 30.401 .060 .049 .053 .056 200.9 23.894 204.9 25.937 208.9 28.123 212.9 30.461 201.0 23.943 0.049 205.0 25.990 0.053 209.0 28.180 0.057 213.0 30.522 0.060 D 105 APPENDIX THE HYPSOMETRIC!! TABLES. COMPARISON OF THE DIFFERENT MEASURES OF LENGTH MOST GENERALLY USEf FOR INDICATING ALTITUDES. 107 COMPARISON Oi' THE MEASURES OF LENGTH MOST GENERALLY USED FOR INDICATING ALTITUDES. IT is too well known that the measures used in scientific researches among civilized nations are not uniform, as the convenience of all would require. In France the metre is employed ; in England and North America, the yard and its third part, the English foot ; in Germany, most commonly, the Old French or Paris foot, the sixth part of the French toise called the Toise du Perou ; at the same time, however, though not so extensively, the Rhine foot, in Denmark and Holland, and especially in Prussia, where it has been declared, under the name of Prussian foot, the legal measure in that kingdom ; in Austria, the klafter of Vienna and its sixth part, the foot of Vienna ; in Switzerland, the Swiss or federal foot, which has been adjusted to the metrical system, and is three tenths of a metre ; and so on. The numerous altitudes ascertained, either by private efforts, or in connection with the public works, and quite especially with the extensive geodetic operations carried on by the governments of these various countries for the survey of a regular map, are expressed in the measures respectively adopted by each of them. These heights, however, before they can be compared, require to be uniformly reduced to any one of these measures. Their relation to each other, therefore, is given here, together with numerous reduction tables, designed to save both the useless expenditure of time and the almost unavoidable errors arising from so numerous reductions. The exact relation of the standard measures above mentioned is not easily ascer- tained, and the numbers given by the best authorities by no means always agree ; for the manufacture of exact copies of a standard scale, and the accurate comparison of it, require considerable skill, and belong to the most delicate operations of physics. The numbers used for computing the following tables have been adopted, after a careful review of the authorities, as the most reliable. A few words on the most important original legal standards of measures may not be unwelcome. For further details on the subject the reader is referred principally to Dove's work, Maas und Messen, 2d edition, Berlin, 1835. The principal original, legal standards are the following : — 1. The Toise du Perou, the old French standard, made in 1735, in Paris, by Lan- glois, under the direction of Godin, is a bar of iron which has its standard length at the temperature of 13° Reaumur. It is known as the Toise du Perou, because it was used by the French Academicians Bouguer and La Condamine in their measurement D 109 COMPARISON OF THE VARIOUS MEASURES OF LENGTH of an arc of the meridian in Peru. What follows will show that it may almost be called the only common standard, to which all the others are referred for com- parison. 2. The Metre is a standard bar of platina, made by Lenoir in Paris, which has its normal length at the temperature of zero Centigrade, or the freezing point. Its length is intended to make it a natural standard, and to represent the ten-millionth part of the terrestrial arc comprised between the equator and the pole, or of a quarter of the meridian. The length of this arc given by the measurement ordered for the purpose by the Assemblee Nationale, of the arc of the meridian between Barcelona, through France, to Dunkirk, combined with the measurements previously made in Peru and in Lapland, gave for the distance of the equator from the pole 5,130,740 toises, with an ellipticity of 7^5-, and for the length of the metre 443.29596 lines of the toise du Perou, assumed to be 443.296 lines, or 3 feet 11.296 lines. This last quantity was declared in 1799 to be the length of the legal metre, and vrai et definitif, and is the length of Lenoir's platina standard. Later and more extensive measurements in various parts of the globe, however, seem to indicate that this quantity is somewhat too small. The latest and most exact results we now possess, combined and computed by Bessel, would make the quarter of the meridian 10,000,856 metres, and the metre = 443.29979 Paris lines ; Schmidt's computation would make it 443.29977 lines, and both numbers are confirmed by Airy's results. The legal metre is thus, in fact, as Dove remarks, a legalized part of the toise du Perou, and this last remains the primitive standard. But it must be added that a natural standard, in the absolute sense of the word, is a Utopian one, which ever-changing Nature never will give us. The metre is, for all practical purposes, what it was intended to be, a natural standard ; though it must be confessed that, in practice, the ques- tion is not whether and how far a standard is a natural or a conventional one, but how readily and accurately it can be obtained, or recovered when lost. 3. The English Standard Yard is a brass bar, made by Bird in 1760, which was declared, by act of Parliament, 1st May, 1825, the legal measure of length when at the temperature of 62° Fahrenheit, under the name of Imperial Standard, Another standard, sometimes also called Parliamentary Standard, was made by Bird in 1758. Sir George Shuckburgh found both to be nearly identical, at least within 0.0002 of an inch. (Philos. Trans, for 1798, p. 170.) Another scale of brass, however, made by Troughton for Sir George Shuckburgh, described in the Philosophical Transactions for 1798, and known as Shuckburgh's scale, obtained among scientific men, perhaps, a higher degree of authority, on account of the great accuracy of its division, and of its apparatus, devised by Troughton, for delicate comparisons. That scale was used by Captain Kater, in 1818, in his researches for determining the length of the pendulum beating a second at London, and also the length of the metre, expressed in English inches of the imperial standard. (Phil. Trans, for 1818.) Numerous attempts to determine the relation between the English and the French measures show no inconsiderable discrepancies in their results. Omitting the older comparisons with the toise, we give here the value of the metre in English imperial inches, as resulting from the most reliable comparisons. A standard scale made and divided by Troughton, and in all particulars identical D 110 USED FOR INDICATING ALTITUDES. with Shuckburgh's scale, was brought to France in 1801 by Pictet. The comparison of it with the standard metre, made by Prony, Legendre, and Mechain, gave, after due reduction of the two standards to their respective normal temperatures, 1 metre at 32° Fahr. = 39.371 English imperial inches at 62° Fahr. This determination was adopted for all reductions in Kelly's Universal Cambist, and in the French translation of the work, published in Paris in 1823. A new comparison was made with great care by Captain H. Kater, in 1818. (See Philos. Trans, for 1818, p. 103.) The standards used were a brass scale metre, by Fortin, terminated with parallel planes (metre d louts), and a bar of platina on which the length of the metre was marked by two very fine lines (metre a traits). Both were compared with Shuckburgh's scale, and a double series of experiments gave as the mean result : Brass metre at 32° Fahr. = 39.37076 inches of Shuckburgh's scale at 62° Fahr. Platina metre at 32° Fahr. = 39.37081 " " " " " Mean 39.37079 " " " " " On this value of the metre are based the reduction tables by Matthieu, published yearly in the Annuaire du Bureau des Longitudes ; and it has come into general use, both in Europe and in this country. Captain Kater gives besides, in the same paper, p. 109, note, the value of the metre compared with Bird's Parliamentary standard as being 1 metre at 32° F. = 39.37062 imp. inches of Bird's Parliamentary standard at 62° F. This value has been adopted by Dove, as being the legal one, in his reduction tables in his work, Maas und Messen, p. 175, &c., and by many German authorities. According to Baily's experiments, made in 1835, when engaged in constructing a new standard for the Royal Astronomical Society (Memoirs R. Ast. Soc., Vol. IX.), the value of the metre is (Lee, Collection of Tables and Formula, p. 62) 1 metre at 32° F. = 39.370092 imperial standard inches at 62° F. The original legal standards having been lost in the fire which destroyed, several years ago, the Parliament Houses, an act of Parliament provided for the construc- tion of new ones ; but as the report of the committee having charge of the con- struction of the new British standard has not yet been published, the discussion of the subject must be postponed. The value adopted in the following tables, is that determined by Captain Kater, viz. 1 metre = 39.37079 English inches. It may not be out of place to remark that Schumacher, in the first edition of his Sammlung von Hulfstafeln, used the value 1 metre = 39.3827 English inches, as given in the Base du Systeme Metrique ; but this number, which expresses the rela- tion of both standards when at the freezing point, becomes 39.37079 when they are respectively reduced to their normal temperatures. Schumacher's tables, therefore, must be corrected accordingly. 4. The actual standard of length of the United States is a brass scale of eighty- two inches in length, prepared for the Coast Survey of the United States, by Trough- ton of London, meant to be identical with the English Imperial Standard, and depos- ited in the office of weights and measures. The temperature at which it is a standard is 62° Fahrenheit, and the yard measure is between the 27th and 63d inches of the D 111 COMPARISON OF THE VARIOUS MEASURES OF LENGTH scale. (See Report on the Construction and Distribution of Weights and Measures, by Prof. A. D. Bache, 1857.) Hassler, first Superintendent of the United States Coast Survey, made an elaborate comparison of eleven different standard metres with the brass scale of eighty-two inches, by Troughton. Three of the standard metres, certified to be correct by high authorities, seem to deserve especial confidence : — 1. An iron metre, presented to Mr. Hassler by Tralles, which was one of the three that Tralles had made by Lenoir at the same time with those distributed to the committee on the weights and measures. 2. Another metre of iron, also by Lenoir, verified by Bouvard and Arago, and de- clared by them to be identical with the original. 3. A platina standard by Fbrtin, verified by Arago, and found to be T^ of a millimetre too long, for which error allowance was made. Their comparison with the Troughton scale at the tempera- ture of the freezing point gave : 1. Iron metre of Tralles = 39.3809171 inches of the Troughton scale. 2. Iron metre of Lenoir = 39.3799487 3. Platina metre of Fortin = 39.3804194 Or, correcting for expansion, and reducing them to their respective standard temper- atures : 1. Iron metre of Tralles at 32° F. = 39.36850)^ .... , . . ^ , «^^r A ( English inches of the Trough- 2. Iron metre of Lenoir at 32° F. = 39.36754 > . * o^o -r. or. o^-,on 1 ton sca^e °f 82 inches at 62 F. 3. Platina metre of Fortm at 32° F. = 39.36789 ) Hassler, in his Report to Congress on Weights and Measures, in 1832, adopts the first value, viz. : 1 metre at 32° F. = 39.3809171 inches of the Troughton scale at 32° F ; and the Troughton scale was declared the United States standard, from which copies were to be made. This value materially differs from those given by other careful comparisons, while, on the other hand, the close accordance of the numbers corresponding to the various standard metres proves the accuracy of Hassler's method and comparison. It is, therefore, difficult not to ascribe, with Baily, this discrepancy to some inaccuracy in the length of the Troughton scale of 82 inches. But as that scale has been declared I the standard of length of the United States, it seems better to call it, as is done in the Coast Survey Reports, the American yard, and its subdivisions the American foot and inch, and to consider it as a new standard, similar to, but not identical with, the English imperial standard. The value of the metre expressed in American standard inches is given in the Coast Survey Report for 1853, as 1 metre at 32° F. = 39.36850535 United States standard inches at 62° F. We learn from the Report on Weights and Measures, by Prof. A. D. Bache, 1857, p. 18, that two copies of the new British standards, now in progress of construction, viz. a bronze standard, No. 11, and a malleable iron standard, No. 57, have been pre- sented by the British government to the United States. A series of careful compari- sons, made in 1856, by Mr. Saxton, under the direction of Prof. A. D. Bache, of the British bronze standard, No. 11, with the Troughton scale of eighty-two inches, showed that the British bronze standard yard is shorter than the American yard by 0.00087 inch. D 112 USED POR INDICATING ALTITUDES. Comparisons of the American standards with new French standards, recently pre- sented to the United States by the French government, are still in progress. For the present, however, it seems best to adhere to the value of the metre, ex- pressed in American standard inches, adopted by the Coast Survey as given above. From this value the separate tables, which will be found below, for the reduction of the American yard and foot, were computed. 5. The Klafter of Vienna is a silver line let into a prismatic bar of iron, on which the length of the klafter was engraved by Voigtlander. It has its normal length at 13° Reaumur, and was declared by law, in 1816, the standard Klafter of Vienna. On the same silver line the French toise is marked, from the standard toise sent, in 1760, by La Caille and La Condamine to the Observatory of Vienna. According to a recent and very careful comparison by Struve (Mem. of the Austrian Acad., Vol. V., I. p. 117), the value of the klafter of Vienna is 0.9730317 toise du Perou. 6. The Prussian Foot is marked on a standard iron bar, 3 feet long, made by Pistor in Berlin ; it is a standard at the temperature of 13° Reaumur. The length of the Prussian foot was declared by law to be = 139.13 lines of the toise du Perou. 7. A Mexican Vara, the standard length, brought from Mexico at the close of the war, by Major Turnbull of the Topographical Engineers, was presented to the Office of Weights and Measures. This standard was made by soldering sheet-brass upon the tinned surface of an iron bar. A careful comparison of its length with the Amer- ican standard was made under the direction of Prof. Bache, which gave its length to be = 32.9682 inches at 58°.7 Fahrenheit, or 32.9680 when reduced to 62° Fah- renheit. The relation of that particular Mexican standard to the Spanish standard not being known, it was thought better to adopt, for the present, the value of the Spanish Vara, and of its third part, the Castilian foot, found in Thionville, Traite des Poids et Mesures, &c., in Balbi's Abrege de Geographie, viz. 1 vara = 0.847965 metre. From the fundamental equations indicated above have been derived all those which have been used for computing the reduction tables given in the Appendix. At the head of each table will be found the value from which it was computed. The tables are so arranged as to give directly the reduction of any whole number not exceeding three or four figures, and larger numbers within the limits needed for altitudes, by means of a single addition. Example. Reduce 25,351 English feet into metres. In Table XVI., on the line beginning with 25,000 and in the column headed 300, take for 25,300 = 7711.30 metres. In the second part of the table, on the line beginning with 50, and in column headed 1, take for 51 = 15.54 " English feet 25,351 = 7726.84 " The fractions, which seldom occur, are treated as whole numbers, taking care only properly to move the decimal point. Tables XL. to XLIV. will be found convenient for converting fractional parts of a toise or of a foot into each other. D 113 TO CONVERT FRENCH TO ISE S INTO DIFFERENT MEASURES OF LENGTH. I. CONVERSION OF FRENCH TOISES INTO METRES. 1 Toise = 1.94903631 Metre. Units. Toises. Tens. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. 0 0.000 1.949 3.898 5.847 7.796 9.745 11.694 13.643 15.592 17.541 10 19.490 21.439 23.388 25.337 27.287 29.236 31.185 33.124 35.073 37.022 20 38.981 40.930 42.879 44.828 46.777 48.726 50.675 52.624 54.573 56.522 30 58.471 60.420 62.369 64.318 66.267 68.216 70.165 72.114 74.063 76.012 40 77.961 79.911 81.860 83.809 85.758 87.707 89.656 91.605 93.554 95.503 50 97.452 99.401 101.350 103.299 105.248 107.197 109.146 111.095 113.044 114.993 60 116.942 118.891 120.840 122.789 124.738 126.687 128.636 130.585 132.534 134.484 70 136.433 138.382 140.331 142.280 144.229 146.178 148.127 150.076 152.025 153.974 80 155.923 157.872 159.821 161.770 163,719 165.668 167.617 169.566 171.515 173.464 90 175.413 177.362 179.311 181.260 183.209 185.158 187.108 189.057 191.006 192.955 Hundreds. Thousands. 0. 100. 200. 3OO. 400. 500. 600. 700. §00. 900. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. 0 0.00 194.90 389.81 584.71 779.61 974.52 1169.42 1364.33 1559.23 1754.13 1000 1949.04 2143.94 2338.84 2533.75 2728.65 2923.55 3118.46 3312.36 3507.27 3702.17 2000 3898.07 4092.98 4287.88 4482.78 4677.69 4872.59 5067.50 5262.40 5457.30 5652.21 3000 5847.11 6042.01 6236.92 6431.82 6626.72 6821.63 7016.53 7211.44 7406.34 7601.24 4000 7796.15 7991.05 8185.95 8380.86 8575.76 8770.66 8965.57 9160.47 9355.38 9550.28 5000 9745.18 9940.09 10135.0 10329.9 10524.8 10719.7 10914.6 11109.5 11304.4 11499.3 II. CONVERSION OF TOISES INTO FRENCH OR PARIS FEET. 1 Toise = 6 French Feet. Toises Units. Tens. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Par Ftet Par.Feet. Par.Feet. Par.Feet. Par.Feet. ParFeet. Par.Feet. Par.Feet. Par Feet Par. Feet. 0 0.00 6 12 18 24 30 36 42 48 54 10 60 66 72 78 84 90 96 102 108 114 20 120 126 132 138 144 150 156 162 168 174 30 180 186 192 198 204 210 216 222 228 234 40 240 246 252 258 264 270 276 282 288 294 50 300 306 312 318 324 330 336 342 348 354 60 360 366 372 378 384 390 396 402 408 414 70 420 426 432 438 444 450 456 462 468 474 80 480 486 492 498 504 510 516 522 528 534 90 540 546 552 558 564 570 576 582 588 594 D 114 Til. CONVERSION OF FRENCH TOISES INTO ENGLISH FEET AND DECIMALS. 1 Toise = 6.8945916 English Feet. Toises Units. Tens. 0. 1. 2. 3. 4. 5. 6. 7. §. 9. Eng.feet. Eng. feet. Eng feet. Eng feet. Eng. feet. Eng. feet. Eng. feet. Eng feet. Eng.feet. Eng. feet. 0 0.000 6.395 12.789 19.184 25.578 31.973 38.368 44.762 51.157 57.551 10 63.946 70.340 ' 76.735 83.130 89.524 95.919 102.313 108.708 115.103 121.497 20 127.892 134.286 140.681 147.076 153.470 159.865 166.259 172.654 179.049 185.443 30 191.838 198.232 204.627 211.021 217.416 223.811 230.205 236.600 242.994 249.389 40 255.784 262.178 268.573 274.967 281.362 287.757 294.151 300.546 306.940 313.335 50 319.729 326.124 332.519 338.913 345.308 351.702 358.097 364.492 370.886 377.281 60 383.675 390.070 396.465 402.859 409.254 415.648 422.043 428.438 434.832 441.227 70 447.621 454.016 460.410 466.805 473.200 479.594 485.989 492.383 498.778 505.173 80 511.567 517.962 524.356 530.751 537.146 543.540 549.935 556.329 562.724 569.119 90 575.513 581.908 588.302 594.697 601.091 607-486 613.881 620.275 626.670 633.064 Hundreds. Thousands. o. 1OO. 2OO. 30O. 400. 500. 6OO. 700. §00. 9OO. • Eng. feet. Eng. feet. Eng. feet. Eng. feet. Eng. feet. Eng. feet. Eng feet. Eng. feet Eng feet. Eng.feet. 0 0.0 639.5 1278.9 1918.4 2557.8 3197.3 3836.8 4476.2 5115.7 5755.1 1000 6394.6 7034.0 7673.5 8313.0 8952.4 9591.9 10231.3 10870.8 11510.3 12149.7 2000 12789.2 13428.6 14068.1 14707.6 15347.0 15986.5 16625.9 17265.4 17904.9 18544.3 3000 19183.8 19823.2 20462.7 21102.1 21741.6 22381.1 23020.5 23660.0 24299.4 24938.9 4000 25578.4 26217.8 26857.3 27496.7 28136.2 28775.7 29415.1 30054.6 30694.0 31333.5 5000 31972.9 32612.4 33251.9 33891.3 34530.8 35170.2 35809.7 36449.2|370S8.6 37728.1 IV. CONVERSION OF FRENCH TOISES INTO AMERICAN FEET. 1 Toise = 6.3942205 American Feet. Units. Toises. Tens. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Am. Feet. Am.Feet Am. Feet. Am.Feet. Am.Feet Am. Feet Am.Feet Am Feet. Am.Feet. Am.Feet 0 0.000 6.394 12.788 19.183 25.577 31.971 38.365 44.760 51.154 57.548 10 63.942 70.336 76.731 83.125 89.519 95.913 102.308 108.702 115.096 12K49C 20 127.884 184.279 140.673 147.067 153.461 159.855 166.250 172.644 179.038 185.432 30 191.827 198.221 204.615 211.009 217.403 223.798 230.192 236.586 242.980 249.375- 40 255.769 262.163 268.557 274.951 281.346 287.740 294.134 300.528 306.923 313.317;! 50 319.711 326.105 332.499 338.894 345.288 351.682 358.076 364.470 370.865 377.259 60 383.653 390.047 396.442 402.836 409.230 415.624 422.018 428.413 434.807 441^01? 70 447.595 453.990 460.384 466.778 473.172 479.566 485.961 492.355 498.749 505449 80 511.538 517.932 524.326 530.720 537.114 543.509 549.S03 556.297 562.691 569.085 90 575.480 581.874 588.268 594.662 601.057 607.451 613.845 620.239 626.633 633.028 1 Hundreds. Thousands. O. 1OO. 200. 300. 400. 500. 600. 700. §00. 900. Am. Feet Am Feet Am Feet Am.Feet. Am.Feet. Am Feet Am Feet. Am.Feet. Am Feet. Am.F«et. 0 0.0 639.4 1278.8 1918.3 2557.7 3197.1 3836.5 4476.0 5115.4 5754.8 1000 6394.2 7033.6 7673.1 8312.5 8951.9 9591.3 10230.8 10870.2 11509.6 12149.0 2000 12788.4 13427.9 14067.3 14706.7 15346.1 15985.5 16625.0 17264.4 17903.8 18543.2 3000 19182.7 19822.1 20461.5 21100.9 21740.3 22379.8 23019.2 23658.6 24298.0 24937.5 4000 25576.9 26216.3 26855.7 27495.1 28134.6 2S774.0 29413.4 30052.8 30692.3 31331.7 5000 31971.1 32610.5 33249.9 33889.4 3-1528.8 35168.2 35807.6 36447.0 37086.5 37725.9 1 D 115 TO CONVERT METRES INTO DIFFERENT MEASURES OF LENGTH. 1 LEGAL METRE = 443.296 FRENCH OR PARIS LINES. V. CONVERSION OF METRES INTO TOISES AND DECIMALS. 1 Metre = 0.513074074 Toise. Hundreds. Metres. Thousands. 0. 100. 200. 300. 400. 500. 600. 700. 800. 900. Toises. Toises. Toises. Toises. Toises. Toises. Toises Toises. Toises. Toises. 0 0.00 51.31 102.61 153.92 205.23 256.54 307.84 359.15 410.46 461.77 1000 513.07 564.38 615.69 667.00 718.30 769.61 820.92 872.23 923.53 974.84 2000 1026.15 1077.46 1128.76 1180.07 1231.38 1282.69 1333.99 1385.30 1436.61 1487.91 3000 1539.22 1590.53 1641.84 1693.14 1744.45 1795.76 1847.07 1898 37 1949.68 2000.99 4000 2052.30 2103.60 2154.91 2206.22 2257.53 2308.83 2360.14 2411.45 2462.76 2514.06 5000 2565.37 2616.68 2667.98 2719.29 2770.60 2821.91 2873.21 2924.52 2975.83 3027.14 6000 3078.44 3129.75 3181.06 3232.37 3283.67 3334.98 3386.29 3437.60 3488.90 3540.21 7000 3591.52 3642.83 3694.13 3745.44 3796.75 3848.06 3899.36 3950.67 4001.98 4053.28 8000 4104.59 4155.90 4207.21 4258.51 4309.82 4361.13 4412.44 4463.74 4515.05 4566.36 9000 4617.67 4668.97 4720.28 4771.59 4822.90 4874.20 4925.51 4976.82 5028.13 5079.43 Units. Metres. Tens. 0. 1. 2. 3. 4. 5. 6. •7. 8. 9. Toises. Toises. Toises. Toises. Toises. Toises. Toises. Toises. Toises. Toises. 0 0.000 0.513 1.026 1.539 2.052 2.565 3.078 3.592 4.105 4.618 Ifl 5.131 5.644 6.157 6.670 7.183 7.696 8.209 8.722 9.235 9.748 29 10.261 10.775 11.288 11.801 12.314 12.827 13.340 13.853 14.366 14.879 30 15.392 15.905 16.418 16.931 17.445 17.958 18.471 18.984 19.497 20.010 40 20.523 21.036 21.549 22.062 22.575 23.088 23.601 24.114 24.628 25.141 50 25.654 26.167 26.680 27.193 27.706 28.219 28.732 29.245 29.758 30.271 60 30.784 31.298 31.811 32.324 32.837 33.350 33.863 34.376 34.889 35.402 70 35.915 36.428 36.941 37.454 37.967 38.481 38.994 39.507 40.020 40.583 80 41.046 41.559 42.072 42.585 43.098 43.611 44.124 44.637 45.151 45.664 90 46.177 46.690 47.203 47.716 48.229 48.742 49.255 49.768 50.281 50.794 116 VI. CONVERSION OF METRES INTO PARIS OR FRENCH FEET AND DECIMALS. 1 Metre = 3.078444 Paris Feet. Metres. Tens. Metres. Units. o. 1. 2. 3. 4. 5. 6. ?. 8. 9. Fr. Feet. Fr. Feet. Fr.Feet. Fr. Feet. Fr. Feet. Fr. Feet. Fr. Feet. Fr. Feet. Fr Feet. Fr. Feet. 0 0.00 3.08 6.16 9.24 12.31 15.39 18.47 21.55 24.63 27.71 10 30.78 33.86 36.94 40.02 43.10 46.18 49.26 52.33 55.41 58.49 20 61.57 64.65 67.73 70.80 73.88 76.96 80.04 83.12 86.20 89.27 30 92.35 95.43 98.51 101.59 104.67 107.75 110.82 113.90 116.98 120.06 40 123.14 126.22 129.29 132.37 135.45 138.53 141.61 144.69 147.77 150.84 50 153.92 157.00 160.08 163.16 166.24 169.31 172.39 175.47 178.55 181.63 60 184.71 187.79 190.86 193.94 197.02 200.10 203.18 206.26 209.33 212.41 70 215.49 218.57 221.65 224.73 227.80 230.88 233.96 237.04 240.12 243.20 80 246.28 249.35 252.43 255.51 258.59 261.67 264.75 267.82 270.90 273.98 90 277.06 280.14 283.22 286.30 289.37 292.45 295.53 298.61 301.69 304.77 100 307.84 310.92 314.00 317.08 320.16 323.24 326.32 329.39 332.47 335.55 110 338.63 341.71 344.79 347.86 350.94 354.02 357.10 360.18 363.26 366.33 120 369.41 372.49 375.57 378.65 381.73 384.81 387.88 390.96 394.04 397.12 130 400.20 403.28 406.35 409.43 412.51 415.59 418.67 421.75 424.83 427.90 140 430.98 434.06 437.14 440.22 443.30 446.37 449.45 452.53 455.61 458.69 150 461.77 464.85 467.92 471.00 474.08 477.16 480.24 483.32 486.39 489.47 160 492.55 495.63 498.71 501.79 504.86 507.94 511.02 514.10 517.18 520.26 170 523.34 526.41 529.49 532.57 535.65 538.73 541.81 544.88 547.96 551.04 180 554.12 557.20 560.28 563.36 566.43 569.51 572.59 575.67 578.75 581.83 190 584.90 587.98 591.06 594.14 597.22 600.30 603.38 606.45 609.53 612.61 200 615.69 618.77 621.85 624.92 628.00 631.08 634.16 637.24 640.32 643.39 210 646.47 649.55 652.63 655.71 658.79 661.87 664.94 668.02 671.10 674.18 220 677.26 680.34 683.41 686.49 689.57 692.65 695.73 698.81 701.89 704.96 230 708.04 711.12 714.20 717.28 720.36 723.43 726.51 729.59 732.67 735.75 240 738.83 741.90 744.98 748.06 751.14 754.22 757.30 760.38 763.45 766.53 250 769.61 772.69 775.77 778.85 781.92 785.00 788.08 791.16 794.24 797.32 260 800.40 803.47 806.55 809.63 812.71 815.79 818.87 821.94 825.02 828.10 270 831.18 834.26 837.34 840.42 843.49 846.57 849.65 852.73 855.81 858.89 280 861.96 865.04 868.12 871.20 874.28 877.36 880.43 883.51 886.59 889.67 290 892.75 895.83 898.91 901.98 905.06 908.14 911.22 914.30 917.38 920.45 300 923.53 926.61 929.69 932.77 935.85 938.93 942.00 945.08 948.16 951.24 310 954.32 957.40 960.47 963.55 966.63 969.71 972.79 975.87 978.95 982.02 320 985.10 988.18 991.26 994.34 997.42 1000.49 1003.57 1006.65 1009.73 1012.81 330 1015.89 1018.96 1022.04 1025.12 1028.20 1031.28 1034.36 1037.44 1040.51 1043.59 340 1046.67 1049.75 1052.83 1055.91 1058.98 1062.06 1065.14 1068.22 1071.30 1074.38 350 1077.46 1080.53 1083.61 1086.69 1089.77 1092.85 1095.93 1099.00 1102.08 1105.16 360 1108.24 1111.32 1114.40 1117.48 1120.55 1123.63 1126.71 1129.79 1132.87 1135.95 370 1139.02 1142.10 1145.18 1148.26 1151.34 1154.42 1157.49 1160.57 1163.65 1166.73 380 1169.81 1172.89 1175.97 1179.04 1182.12 1185.20 1188.28 1191.36 1194.44 1197.51 390 1200.59 1203.67 1206.75 1209.83 1212.91 1215.99 1219.06 1222.14 1225.22 1228.30 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 117 CONVERSION OF METRES INTO PARIS OR FRENCH FEET AND DECIMALS. 1 Metre = 3.078444 Paris Feet. Metres. Units. Metres. Tens. 0. 1. 2. 3. 4. 5. 6. 7. §. 9. Fr. Feet. Fr. Feet. Fr. Feet. Fr. Feet. Fr. Feet. Fr. Feet. Fr. Feet. Fr.Feet- Fr. Feet. Fr. Feet. 400 1231.38 1234.46 1237.53 1240.61 1243.69 1246.77 1249.85 1252.93 1256.01 1259.08 410 1262.16 1265.24 1268.32 1271.40 1274.48 1277.55 1280.63 1283.71 1286.79 1289.87 420 1292.95 1296.02 1299.10 1302.18 1305.26 1308.34 1311.42 1314.50 1317.57 1320.65 430 1323.73 1326.81 1329.89 1332.97 1336.04 1339.12 1342.20 1345.28 1348.36 1351.44 440 1354.52 1357.59 1360.67 1363.75 1366.83 1369.91 1372.99 1376.06 1379.14 1382.22 450 1385.30 1388.38 1391.46 1394.54 1397.61 1400.69 1403.77 1406.85 1409.93 1413.01 460 1416.08 1419.16 1422.24 1425.32 1428.40 1431.48 1434.55 1437.63 1440.71 1443.79 470 1446.87 1449.95 1453.03 1456.10 1459.18 1462.26 1465.34 1468.42 1471.50 1474.57 480 1477.65 1480.73 1483.81 1486.89 1489.97 1493.05 1496.12 1499.20 1502.28 1505.36 490 1508.44 1511.52 1514.59 1517.67 1520.75 1523.83 1526.91 1529.99 1533.07 1536.14 500 1539.22 1542.30 1545.38 1548.46 1551.54 1554.61 1557.69 1560.77 1563.85 1566.93 510 1570.01 1573.08 1576.16 1579.24 1582.32 1585.40 1588.48 1591.56 1594.63 1597.71 520 1600.79 1603.87 1606.95 1610.03 1613.10 1616.18 1619.26 1622.34 1625.42 1628.50 530 1631.58 1634.65 1637.73 1640.81 1643.89 1646.97 1650.05 1653.12 1656.20 1659.28 540 1662.36 1665.44 1668.52 1671.60 1674.67 1677.75 1680.83 1683.91 1686.99 1690.07 550 1693.14 1696.22 1699.30 1702.38 1705.46 1708.54 1711.61 1714.69 1717.77 1720.85 560 1723.93 1727.01 1730.09 1733.16 1736.24 1739.32 1742.40 1745.48 1748.56 1751.63 570 1754.71 1757.79 1760.87 1763.95 1767.03 1770.11 1773.18 1776.26 1779.34 1782.42 580 1785.50 1788.58 1791.65 1794.73 1797.81 1800.89 1803.97 1807.05 1810.13 1813.20 590 1816.28 1819.36 1822.44 1825.52 1828.60 1831.67 1834.75 1837.83 1840.91 1843.99 600 1847.07 1850.14 1853.22 1856.30 1859.38 1862.46 1865.54 1868.62 1871.69 1874.77 610 1877.85 1880.93 1884.01 1887.09 1890.16 1893.24 1896.32 1899.40 1902.48 1905.56 620 1908.64 1911.71 1914.79 1917.87 1920.95 1924.03 1927.11 1930.18 1933.26 1936.34 630 1939.42 1942.50 1945.58 1948.66 1951.73 1954.81 1957.89 1960.97 1964.05 1967.13 640 1970.20 1973.28 1976.36 1979.44 1982.52 1985.60 1988.67 1991.75 1994.83 1997.91 650 2000.99 2004.07 2007.15 2010.22 2013.30 2016.38 2019.46 2022.54 2025.62 2028.69 660 2031.77 2034.85 2037.93 2041.01 2044.09 2047.17 2050.24 2053.32 2056.40 2059.48 670 2062.56 2065.64 2068.71 2071.79 2074.87 2077.95 2081.03 2084.11 2087.19 2090.26 680 2093.34 2096.42 2099.50 2102.58 2105.66 2108.73 2111.81 2114.89 2117.97 2121.05 690 2124.13 2127.20 2130.28 2133.36 2136.44 2139.52 2142.60 2145.68 2148.75 2151.83 700 2154.91 2157.99 2161.07 2164.15 2167.22 2170.30 2173.38 2176.46 2179.54 2182.62 710 2185.70 2188.77 2191.85 2194.93 2198.01 220l.09l2204.17 2207.24 2210.32 2213.40 720 2216.48 2219.56 2222.64 2225.72 2228.79 2231.87 2234.95 2238.03 2241.11 2244.19 730 2247.26 2250.34 2253.42 2256.50 2259.58 2262.66 2265.73 2268.81 2271.89 2274.97 740 2278.05 2281.13 2284.21 2287.28 2290.36 2293.44 2296.52 2299.60 2302.68 2305.75 750 2308.83 2311.91 2314.99 2318.07 2321.15 2324.23 2327.30 2330.38 2333.46 2336.54 760 2339.62 2342.70 2345.77 2348.85 2351.93 2355.01 2358.09'2361.17 2364.24 2367.32 770 2370.40 2373.48 2376.56 2379.64 2382.72 2385.79 2388.8712391.95 2395.03 2398.11 780 2401.19 2404.26 2407.34 2410.42 2413.50 2416.58 2419.66 2422.74 2425.81 2428.89 790 2431.97 2435.05 2438.13 2441.21 2444.28 2447.36 2450.44 2453.52 2456.60 2459.68 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 118 CONVERSION OF METRES INTO PARIS OR FRENCH FEET AND DECIMALS. 1 Metre = 3.078M4 Paris Feet. Metres. Units. Metro*. Tens. o. 1. 2. 3. 4. 5. 6. •7. 8. 9. 800 Fr. Feet. 2462.76 Fr. Feet. 2465.83 Fr.Feet. 2468.91 Fr. Feet. 2471.99 Fr. Feet. 2475.07 Fr. Feet. 2478.15 Fr.Feet. 2481.23 Fr. Feet. 2484.30 Fr Feet. 2487.38 Fr. Feet. 2490.46 810 2493.54 2496.62 2499.70 2502.77 2505.85 2508.93 2512.01 2515.09 2518.17 2521.25 820 2524.32 2527.40 2530.48 2533.56 2536.64 2539.72 2542.79 2545.87 2548.95 2552.03 830 2555.11 2558.19 2561.27 2564.34 2567.42 2570.50 2573.58 2576.66 2579.74 2582.81 840 2585.89 2588.97 2592.05 2595.13 2598.21 2601.29 2604.36 2607.44 2610.52 2613.60 850 2616.68 2619.76 2622.83 2625.91 2628.99 2632.07 2635.15 2638.23 2641.30 2644.38 860 2647.46 2650.54 2653.62 2656.70 2659.78 2662.85 2665.93 2669.01 2672.09 2675.17 870 2678.25 2681.32 2684.40 2687.48 2690.56 2693.64 2696.72 2699.80 2702.87 2705.95 880 2709.03 2712.11 2715.19 2718.27 2721.34 2724.42 2727.50 2730.58 2733.66 2736.74 890 2739.82 2742.89 2745.97 2749.05 2752.13 2755.21 2758.29 2761.36 2764.44 2767.52 900 2770.60 2773.68 2776.76 2779.83 2782.91 2785.99 2789.07 2792.15 2795.23 2798.31 910 2801.38 2804.46 2807.54 2810.62 2813.70 2816.78 2819.85 2822.93 2826.01 2829.09 920 2832.17 2835.75 2838.33 2841.40 2844.48 2847.56 2850.64 2853.72 2856.80 2859.87 930 2862.95 2866.03 2869.11 2872.19 2875.27 2878.35 2881.42 2884.50 2887.58 2890.66 940 2893.74 2896.82 2899.89 2902.97 2906.05 2909.13 2912.21 2915.29 2918.36 2921.44 950 2924.52 2927.60 2930.68 2933.76 2936.84 2939.91 2942.99 2946.07 2949.15 2952.23 960 2955.31 2958.38 2961.46 2964.54 2967.62 2970.70 2973.78 2976.86 2979.93 2983.01 970 2986.09 2989.17 2992.25 2995.33 2998.40 3001.48 3004.56 3007.64 3010.72 3013.80 980 3016.88 3019.95 3023.03 3026.11 3029.19 3032.27 3035.35 3038.42 3041.50 3044.58 990 3047.66 3050.74 3053.82 3056.89 3059.97 3063.05 3066.13 3069.21 3072.29 3075.37 Metres. French Feet. Metres. French Feet. Metres. French Feet. Metres. French Feet. 1000 3078.44 5000 15392.22 9000 27706.00 13000 40019.78 2000 6156.89 6000 18470.67 10000 30784.44 14000 43098.22 3000 9235.33 7000 21549.11 11000 33862.89 15000 46176.67 4000 12313.78 8000 24627.56 | 12000 36941.33 16000 49255.11 Decimetres. Metres. O. 1. 2. 3. 4. 5. 6. 7. 8. 9. FrFeet. FrFeet. Fr.Feet. Fr.Feet. FrFeet. Fr.Feet Fr.Feet. Fr.Feet. Fr.Feet. Fr.Feet. 0 0.0000 0.3078 0.6157 0.9235 1.2314 1.5392 1.8471 2.1549 2.4628 2.7706 1 3.0784 3.3863 3.6941 4.0020 4.3098 4.6177 4.9255 5.2334 5.5412 5.8490 2 6.1569 6.4647 6.7726 7.0804 7.3883 7.6961 8.0040 8.3118 8.6196 8.9275 3 9.2353 9.5432 9.8510 10.1589 10.4667 10.7746 11.0824 11.3902 11.6981 12.0059 4 12.3138 12.6216 12.9295 13.2373 13.5452 13.8530 14.1608 14.4687 14.7765 15.0844 5 15.3922 15.7001 16.0079 16.3158 16.6236 16.9314 17.2393 17.5471 17.8550 18.1628 6 18.4707 18.7785 19.0864 19.3942 19.7020 20.0099 20.3177 20.6256 20.9334 21.2413 7 21.5491 21.8570 22.1648 22.4726 22.7805 23.0883 23.3962 23.7040 24.0119 24.3197 8 24.6276 24.9354 25.2432 25.5511 25.8589 26.1668 26.4746 26.7825 27.0903 27.3082 9 27.7060 28.0138 28.3217 28.6295 28.9374 29.2452 29.5531 29.8609 30.1688 30.4766 119 VII. CONVERSION OF METRES INTO ENGLISH FEET AND DECIMALS. 1 Metre = 3.28089917 English Feet. Metres. (Units.) 1 Metres. o. 1. 2. 3. 4. 5. 6. 7. 8. 9. Eng.Feet. Eng.Feet. Eng.Feet. Eng.Feet. Eng.Feet. Eng.Feet. Eng.Feet. Eng.Feet. Eng.Feet. Eng.Feet. 0 0.0 3.28 6.56 9.84 13.12 16.40 19.69 22.97 26.25 29.53 10 32.81 36.09 39.37 42.65 45.93 49.21 52.49 55.78 59.06 62.34 20 65.62 68.90 72.18 75.46 78.74 82.02 85.30 88.58 91.87 95.15 30 98.43 101.71 104.99 108.27 111.55 114.83 118.11 121.39 124.67 127.96 40 131.24 134.52 137.80 141.08 144.36 147.64 150.92 154.20 157.48 160.76 50 164.04 167.33 170.61 173.89 177.17 180.45 183.73 187.01 190.29 193.57 60 196.85 200.13 203.42 206.70 209.98 213.26 216.54 219.82 223.10 226.38 70 229.66 232.94 236.22 239.51 242.79 246.07 249.35 252.63 255.91 259.19 80 262.47 265.75 269.03 272.31 275.60 278.88 282.16 285.44 288.72 292.00 90 295.28 298.56 301.84 305.12 308.40 311.69 314.97 318.25 321.53 324.81 100 328.09 331.37 334.65 337.93 341.21 344.49 347.78 351.06 354.34 357.62 110 360.90 364.18 367.46 370.74 374.02 377.30 380.58 383.87 387.15 390.43 120 393.71 396.99 400.27 403.55 406.83 410.11 413.39 416.67 419.96 423.24 130 426.52 429.80 433.08 436.36 439.64 442.92 446.20 449.48 452.78 456.04 140 459.33 462.61 465.89 469.17 472.45 475.73 479.01 482.29 485.57 488.85 150 492.13 495.42 498.70 501.98 505.26 508.54 511.82 515.10 518.38 521.66 160 521.94 528.22 531.51 534.79 538.07 541.35 544.63 547.91 551.19 554.47 170 557.75 561.03 564.31 567.60 570.88 574.16 577.44 580.72 584.00 587.28 180 590.56 593.84 597.12 600.40 603.69 606.97 610.25 613.53 616.81 620.09 190 623.37 626.65 629.93 633.21 636.49 639.78 643.06 646.34 649.62 652.90 200 656.18 659.46 662.74 666.02 669.30 672.58 675.87 679.15 682.43 685.71 210 688.99 692.27 695.55 698.83 702.11 705.39 708.67 711.96 715.24 718.52 220 721.80 725.08 728.36 731.64 734.92 738.20 741.48 744.76 748.05 751.33 230 754.61 757.89 761.17 764.45 767.73 771.01 774.29 777.57 780.85 784.13 240 787.42 790.70 793.98 797.26 800.54 803.82 807.10 810.38 813.66 816.94 250 820.22 823.51 826.79 830.07 833.35 836.63 839.91 843.19 846.47 849.75 260 853.03 856.31 859.60 862.88 866.16 869.44 872.72 876.00 879.28 882.56 270 885.84 889.12 892.40 895.69 898.97 902.25 905.53 908.81 912.09 915.37 280 918.65 921.93 925.21 928.49 931.78 935.06 938.34 941.62 944.90 948.18 290 951.46 954.74 958.02 961.30 964.58 967.87 971.15 974.43 977.71 980.99 300 984.27 987.55 990.83 994.11 997.39 1000.67 1003.96 1007.24 1010.52 1013.80 310 1017.08 1020.36 1023.64 1026.92 1030.20 1033.48 1036.76 1040.05 1043.33 1046.61 320 1049.89 1053.17 1056.45 1059.73 1063.01 1066.29 1069.57 1072.85 1076.13 1079.42 330 1082.70 1085.98 1089.26 1092.54 1095.82 1099.10 1102.38 1105.66 1108.94 1112.22 340 1115.51 1118.79 1122.07 1125.35 1128.63 1131.91 1135.19 1138.47 1141.75 1145.03 350 1148.31 1151.60 1154.88 1158.16 1161.44 1164.72 1168.00 1171.28 1174.56 1177.84 360 1181.12 1184.40 1187.69 1190.97 1194.25 1197.53 1200.81 1204.09 1207.37 1210.65 370 1213.93 1217.21 1220.49 1223.78 1227.06 1230.34 1233.62 1236.90 1240.18 1243.46 380 1246.74 1250.02 1253.30 1256.58 1259.87 1263.15 1266.43 1269.71 1272.99 1276.27 390 1279.55 1282.83 1286.11 1289.39 1292.67 1295.96 1299.24 1302.52 1305.80 1309.08 0. 1. 2. 3. 4. 5. 6. •7. 8. 9. D 120 CONVERSION OF METRES INTO ENGLISH FEET AND DECIMALS. 4OO to 799. TVT +. Metres. (Units.) Metres. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Eng.Feet. Eng.Feet. Eng.Feet. Eng.Feet. Eng.Feet. Eng.Feet. Eng.Feet. Eng.Feet. Eng.Feet Eng.Feet. 400 1312.36 1315.64 1318.92 1322.20 1325.48 1328.76 1332.05 1335.33 1338.61 1341.89 410 1345.17 1348.45 1351.73 1355.01 1358.29 1361.57 1364.85 1368.13 1371.42 1374.70 420 1377.98 1381.26 1384.54 1387.82 1391.10 1394.38 1897.66 1400-94 1404.22 1407.51 430 1410.79 1414.07 1417.35 1420.63 1423.91 1427.19 1430.47 1433.75 1437.03 1440.31 440 1443.60 1446.88 1450.16 1453.44 1456.72 1460.00 1463.28 1466.56 1469.84 1473.12 450 1476.40 1479.69 1482.97 1486.25 1489.53 1492.81 1496.09 1499.37 1502.65 1505.93 460 1509.21 1512.49 1515.78 1519.06 1522.34 1525.62 1528.90 1532.18 1535.46 1538.74 470 1542.02 1545.30 1548.58 1551.87 1555.15 1558.43 1561.71 1564.99 1568.27 1571.55 480 1574.83 1578.11 1581.39 1584.67 1587.96 1591.23 1594.52 1597.80 1601.08 1604.36 490 1607.64 1610.92 1614.20 1617.48 1620.76 1624.05 1627.33 1630.61 1633.89 1637.17 500 1640.45 1643.73 1647.01 1650.29 1653.57 1656.85 1660.13 1663.42 1666.70 1669.98 510 1673.26 1676.54 1679.82 1683.10 1686.38 1689.66 1692.94 1696.22 1699.51 1702.79 520 1706.07 1709.35 1712.63 1715.91 1719.19 1722.47 1725.75 1729.03 1732.31 1735.60 530 1738.88 1742.16 1745.44 1748.72 1752.00 1755.28 1758.56 1761.84 1765.12 1768.40 540 1771.69 1774.97 1778.25 1781.53 1784.81 1788.09 1791.37 1794.65 1797.93 1801.21 550 1804.49 1807.78 1811.06 1814.34 1817.62 1820.90 1824.18 1827.46 1830.74 1834.02 560 1837.30 1840.58 1843.87 1847.15 1850.43 1853.71 1856.99 1860.27 1863.55 1866.83 570 1870.11 1873.39 1876.67 1879.96 1883.24 1886.52 1889.80 1893.08 1896.36 1899.64 580 1902.92 1906 20 1909.48 1912.76 1916.05 1919.33 1922.61 1925.89 1929.17 1932.45 590 1935.73 1939.01 1942.29 1945.57 1948.85 1952.13 1955.42 1958.70 1961.98 1965.26 600 1968.54 1971.82 1975.10 1978.38 1981.66 1984.94 1988.22 1991.51 1994.79 1998.07 610 2001.35 2004.63 2007.91 2011.19 2014.47 2017.75 2021.03 2024.31 2027.60 2030.88 620 2034.16 2037.44 2040.72 2044.00 2047.28 2050.56 2053.84 2057.12 2060.40 2063.69 630 2066.97 2070.25 2073.53 2076.81 2080.09 2083.37 2086.65 2089.93 2093.21 2096.49 640 2099.78 2103.06 2106.34 2109.62 2112.90 2116.18 2119.46 2122.74 2126.02 2129.30 650 2132.58 2135.87 2139.15 2142.43 2145.71 2148.99 2152.27 2155.55 2158.83 2162.11 660 2165.39 2168.67 2171.96 2175.24 2178.52 2181.80 2185.08 2188.36 2191.64 2194.92 670 2198.20 2201.48 2204.76 2208.05 2211.33 2214.61 2217.89 2221.17 2224.45 2227.73 630 2231.01 2234.29 2237.57 2240.85 2244.13 2247.42 2250.70 2253.98 2257.26 2260.54 690 2263.82 2267.10 2270.38 2273.66 2276.94 2280.22 2283.51 2286.79 2290.07 2293.35 700 2296.63 2299.91 2303.19 2306.47 2309.75 2313.03 2316.31 2319.60 2322.88 2326.16 710 2329.44 2332.72 2336.00 2339.28 2342.56 2345.84 2349-12 2352.40 2355.69 2358.97 720 2362.25 2365.53 2368.81 2372.09 2375.37 2378.65 2381.93 2385.21 2388.49 2391.78 730 2395.06 2398.34 2401.62 2404.90 2408.18 2411.46 2414.74 2418.02 2421.30 2424.58 740 2427.87 2431.15 2434.43 2437.71 2440.99 2444.27 2447.55 2450.83 2454.11 2457.39 750 2460.67 2463.96 2467.24 2470.52 2473.80 2477.08 2480.36 2483.64 2486.92 2490.20 760 2493.48 2496.76 2500.05 2503.33 2506.61 2500.89 2513.17 2516.45 2519.73 2523.01 770 2526.29 2529.57 2532.85 2536.14 2539.42 2542.70 2545.98 2549.26 2552.54 2555.82 780 2559.10 2562.38 2565.66 2568.94 2572.22 2575.51 2578.79 2582.07 2585.35 2588.63 790 2591.91 2595.19 2598.47 2601.75 2605.03 2608.31 2611.60 2614.88 2618.16 2621.44 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 1 D 121 CONVERSION OF METRES INTO ENGLISH FEET AND DECIMALS. SOO to 1199. Metres. (Units.) Metros. O. 1. 2. 3. 4. 5. 6. 7. 8. 9. Eng.Feet Eng.Feet Eng.Feet Eng.Feet Eng.Feet Eng.Feet Eng.Feet Eng.Feet Eng.Feet Eng.Feet. 800 2624.72 2628.00 2631.28 2634.56 2637.84 2641.12 2644.40 2647.69 2650.97 2654.25 810 2657.53 2660.81 2664.09 2667.37 2670.65 2673.93 2677.21 2680.49 2683.78 2687.06 820 2690.34 2693.62 2696.90 2700.18 2703.46 2706.74 2710.02 2713.30 2716.58 2719.87 830 2723.15 2726.43 2729.71 2732.99 2736.27 2739.55 2742.83 2746.11 2749.39 2752.67 840 2755.96 2759.24 2762.52 2765.80 2769.08 2772.36 2775.64 2778.92 2782.20 2785.48 850 2788.76 2792.05 2795.33 2798.61 2801.89 2805.17 2808.45 2811.73 2815.01 2818.29 860 2821.57 2824.85 2828.14 2831.42 2834.70 2837.98 2841.26 2844.54 2847.82 2851.10 870 2854.38 2857.66 2860.94 2864.22 2867.51 2870.79 2874.07 2877.55 2880.63 2883.91 880 2887.19 2890.47 2893.75 2897.03 2900.31 2903.60 2906.88 2910.16 2913.44 2916.72 890 2920.00 2923.28 2926.56 2929.84 2933.12 2936.40 2939.69 2942.97 2946.25 2949.53 900 2952.81 2956.09 2959.37 2962.65 2965.93 2969.21 2972.49 2975.78 2979.06 2982.34 910 2985.62 2988.90 2992.18 2995.46 2998.74 3002.02 3005.30 3008.58 3011.87 3015.15 920 3018.43 3021.71 3024.99 3028.27 8031.55 3034.83 3038.11 3041.39 3044.67 3047.96 930 3051.24 3054.52 3057.80 3061.08 3064.36 3067.64 3070.92 3074.20 3077.4S 3080.76 940 3084.05 3087.33 3090.61 3093.89 3097.17 3100.45 3103.73 3107.01 3110.29 3113.57 950 3116.85 3120.14 3123.42 3126.70 3129.98 3133.26 3136.54 3139.82 3143.10 3146.38 960 3149.66 3152.94 3156.22 3159.51 3162.79 3166.07 3169.35 3172.63 3175.91 3179.19 970 3182.47 3185.75 3189.03 3192.31 3195.60 3198.88 3202.16 3205.44 3208.72 3212.00 980 3215.28 3218.56 3221.84 3225.12 3228.40 3231.69 3234.97 3238.25 3241.53 3244.81 j 990 3248.09 3251.37 3254.65 3257.93 3261.21 3264.49 3267.78 3271.06 3274.34 3277.62 1000 3280.90 3284.18 3287.46 3290.74 3294.02 3297.30 3300.58 3303.87 3307.15 3310.43 1010 3313.71 3316.99 3320.27 3323.55 3326.83 3330.11 3333.39 3336.67 3339.96 3343.24 1020 3346.52 3349.80 3353.08 3356.36 3359.64 3362.92 3366.20 3369.48 3372.76 3376.05 1030 3379.33 3382.61 3385.89 3389.17 3392.45 3395.73 3399.01 3402.29 3405.57 3408.85 1040 3412.14 3415.42 3418.70 3421.98 3425.26 3428.54 3431.82 3435.10 3438.38 3441.66 1050 3444.94 3448.22 3451.51 3454.79 3458.07 3461.35 3464.63 3467.91 3471.19 3474.47 1060 3477.75 3481.03 3484.31 3487.60 3490.88 3494.16 3497.44 3500.72 3504.00 3507.28 1070 3510.56 3513.84 3517.12 3520.40 3523.69 3526.97 3530.25 3533.53 3536.81 3540.09 1080 3543.37 3546.65 3549.93 3553.21 3556.49 3559.78 3563.06 3566.34 3569.62 3572.90 1090 3576.18 3579.46 3582.74 3586.02 3589.30 3592.58 3595.87 3599.15 3602.43 3605.71 1100 3608.99 3612.27 3615.55 3618.83 3622.11 625.39 3628.67 3631.96 3635.24 3638.52 1110 3641.80 3645.08 3648.36 3651.64 3654.92 3658.20 3661.48 3664.76 3668.05 3671.33 1120 3674.61 3677.89 3681.17 3684.45 3687.73 691.01 3694.29 3697.57 3700.85 3704.14 1130 3707.42 3710.70 3713.98 3717.26 3720.54 3723.82 3727.10 3730.38 3733.66 3736.94 1140 3740.22 3743.51 3746.79 3750.07 3753.35 3756.63 3759.91 3763.19 3766.47 3769.75 1150 3773.03 3776.31 3779.60 3782.88 3786.16 3789.44 3792.72 3796.00 3799.28 3S02.56 1160 3805.84 3809.12 3812.40 3815.69 3818.97 3822.25 3825.53 3828.81 3832.09 3835.37 1170 3838.65 3841.93 3845.21 3848.49 3851.78 3855.06 3858.34 3861.62 3864.90 3868.18 1180 3871.46 3874.74 3878.02 3881.30 3884.58 3887.87 3891.15 3894.43 3897.71 3900.99 I 1190 3904.27 3907.55 3910.83 3914.11 3917.39 3920.67 3923.96 3927.24 3930.52 3933.80 i ••-v O. 1. 2. 3. 4. 5. 6. 7. 8. 9. 122 CONVERSION OF METRES INTO ENGLISH FEET AND DECIMALS. 12OO to 1599. Metres. (Units.) Metres. 0. 1. 2. 3. 4. 5. 6. •7. 8. 9. Eng.Feet. Eng.Feet. Eng.Feet. Eng.Feet. Eng.Feet Eng.Feet. Eng.Feet. Eng.Feet. Eng.Feet Eng.Feet. 1200 3937.08 3940.36 3943.64 3946.92 3950.20 3953.48 3956.76 3960.05 3963.33 3966.61 1210 3969.89 3973.17 3976.45 3979.73 3983.01 3986.29 3989.57 3992.85 3996.14 3999.42 1220 4002.70 4005.98 4009.26 4012.54 4015.82 4019.10 4022.38 4025.66 4028.94 4032.23 1230 4035.51 4038.79 4042.07 4045.35 4048.63 4051.91 4055.19 4058.47 4061.75 4065.03 1240 4068.31 4071.60 4074.88 4078.16 4081.44 4084.72 4088.00 4091.28 4094.56 4097.84 1250 4101.12 4104.40 4107.69 4110.97 4114.25 4117.53 4120.81 4124.09 4127.37 4130.65 1260 4133.93 4137.21 4140.49 4143.78 4147.06 4150.34 4153.62 4156.90 4160.18 4163.46 1270 4166.74 4170.02 4173.30 4176.58 4179.87 4183.15 4186.43 4189.71 4192.99 4196.27 1280 4199.55 4202.83 4206.11 4209.39 4212.67 4215.96 4219.24 4222.52 4225.80 4229.08 1290 4232.36 4235.64 4238.92 4242.20 4245.48 4248.76 4252.05 4255.33 4258.61 4261.89 1300 4265.17 4268.45 4271.73 4275.01 4278.29 4281.57 4284.85 4288.14 4291.42 4294.70 1310 4297.98 4301.26 4304.54 4307.82 4311.10 4314.38 4317.66 4320.94 4324.23 4327.51 1320 4330.79 4334.07 4337.35 4340.63 4343.91 4347.19 4350.47 4353.75 4357.03 4360.31 1330 4363.60 4366.88 4370.16 4373.44 4376.72 4380.00 4383.28 4386.56 4389.84 4393.12 1340 4396.40 4399.69 4402.97 4406.25 4409.53 4412.81 4416.09 4419.37 4422.65 4425.93 1350 4429.21 4432.49 4435.78 4439.06 4442.34 4445.62 4448.90 4452.18 4455.46 4458.74 1360 4462.02 4465.30 4468.58 4471.87 4475.15 4478.43 4481.71 4484.99 4488.27 4491.55 1370 4494.83 4498.11 4501.39 4504.67 4507.96 4511.24 4514.52 4517.80 4521.08 4524.36 1380 4527.64 4530.92 4534.20 4537.48 4540.76 4544.05 4547.33 4550.61 4553.89 4557.17 1390 4560.45 4563.73 4567.01 4570.29 4573.57 4576.85 4580.14 4583.42 4586.70 4589.98 1400 4593.26 4596.54 4599.82 4603.10 4606.38 4609.66 4612.94 4616.23 4619.51 4622.79 1410 4626.07 4629.35 4632.63 4635.91 4639.19 4642.47 4645.75 4649.03 4652.31 4655.60 1420 4658.88 4662.16 4665.44 4668.72 4672.00 4675.28 4678.56 4681.84 4685.12 4688.40 1430 4691.69 4694.97 4698.25 4701.53 4704.81 4708.09 4711.37 4714.65 4717.93 4721.21 1440 4724.49 4727.78 4731.06 4734.34 4737.62 4740.90 4744.18 4747.46 4750.74 4754.02 1450 4757.30 4760.58 4763.87 4767.15 4770.43 4773.71 4776.99 4780.27 4783.55 4786.83 1460 4790.11 4793.39 4796.67 4799.96 4803.24 4806.52 4809.80 4813.08 4816.36 4819.64 1470 4822.92 4826.20 4829.48 4832.76 4836.05 4839.33 4842.61 4845.89 4849.17 4852.45 1480 4855.73 4859.01 4862.29 4865.57 4868.85 4872.14 4875.42 4878.70 4881.98 4885.26 1490 4888.54 4891.82 4895.10 4898.38 4901.66 4904.94 4908.23 4911.51 4914.79 4918.07 1500 4921.35 4924.63 4927.91 4931.19 4934.47 4937-75 4941.03 4944.31 4947.60 4950.88 1510 4954.16 4957.44 4960.72 4964.00 4967.28 4970.56 4973.84 4977.12 4980.40 4983.69 1520 4986.97 4990.25 4993.53 4996.81 5000.09 5003.37 5006.65 5009.93 5013.21 5016.49 1530 5019.78 5023.06 5026.34 5029.62 5032.90 5036.18 5039.46 5042.74 5046.02 5049.30 1540 5052.58 5055.87 5059.15 5062.43 5065.71 5068.99 5072.27 5075.55 5078.83 5082.11 1550 5085.39 5088.67 5091.96 5095.24 5098.52 5101.80 5105.08 5108.36 5111.64 5114.92 1560 5118.20 5121.48 5124.76 5128.05 5131.33 5134.61 5137.89 5141.17 5144.45 5147.73 1570 5151.01 5154.29 5157.57 5160.85 5164.14 5167.42 5170.70 5173.98 5177.26 5180.54 1580 5183.82 5187.10 5190.38 5193.66 5196.94 5200.23 5203.51 5206.79 5210.07 5213.35 1590 5216.63 5219.91 5223.19 5226.47 5229.75 5233.03 5236.32 5239.60 5242.88 5246.16 O. 1. 2. 3. 4. 5. 6. 7. 8. 9. D CONVERSION OF METRES INTO ENGLISH FEET AND DECIMALS. 16OO to 2OOO. Metres. (Units.) Metres. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Eng.Fee Eng.Feet Eng.Feet Eng.Feet Eng.Fee Eng.Feet Eng.Feet Eng.Feet Eng.Feet Eng.Feet. 1600 5249.44 5252.72 5236.00 5259.28 5262.56 5265.84 5269.12 5272.40 5275.69 5278.97 1610 5282.25 5285.53 5288.81 5292.09 5295.37 5298.65 5301.93 5305.21 5308.49 5311.78 1620 5315.06 5318.34 5321.62 5324.90 5328.18 5331.46 5334.74 5338.02 5341.30 5344.58 1630 5347.87 5351.15 5354.43 5357.71 5360.99 5364.27 5367.55 5370.83 5374.11 5377.39 1640 5380.67 5383.96 5387.24 5390.52 5393.80 5397.08 5400.36 5403.64 5406.92 5410.20 1650 5413.48 5416.76 5420.05 5423.33 5426.61 5429.89 5433.17 5436.45 5439.73 5443.01 1660 5446.29 5449.57 5452.85 5456.14 5459.42 5462.70 5465.98 5469.26 5472.54 5475.82 1670 5479.10 5482.38 5485.66 5488.94 5492.23 5495.51 5498.79 5502.07 5505.35 5508.63 1680 5511.91 5515.19 5518.47 5521.75 5525.03 5528.32 5531.60 5534.88 5538.16 5541.44 1690 5544.72 5548.00 5551.28 5554.56 5557.84 5561.12 5564.40 5567.69 5570.97 5574.25 1700 5577.53 5580.81 5584.09 5587.37 5590.65 5593.93 5597.21 5600.49 5603.78 5607.06 1710 5610.34 5613.62 5616.90 5620.18 5623.46 5626.74 5630.02 5633.30 5636.58 5639.87 1720 5643.15 5646.43 5649.71 5652.99 5656.27 5659.55 5662.83 5666.11 5669.39 5672.67 1730 5675.96 5679.24 5682.52 5685.80 5689.08 5692.36 5695.64 5698.92 5702.20 5705.48 1740 5708.76 5712.05 5715.33 5718.61 5721.89 5725.17 5728.45 5731.73 5735.01 5738.29 1750 5741.57 5744.85 5748.14 5751.42 5754.70 5757.98 5761.26 5764.54 5767.82 5771.10 1760 5774.38 777.66 5780.94 5784.23 5787.51 5790.79 5794.07 5797.35 5800.63 5803.91 1770 5807.19 810.47 813.75 5817.03 5820.32 5823.60 5826.88 5830.16 5833.44 5836.72 1780 840.00 843.28 846.56 849.84 5853.12 5856.40 5859.69 5862.97 5866.25 5869.53 1790 872.81 876.09 879.37 882.65 5885.93 889.21 5892.49 5895.78 5899.06 5902.34 1800 905.62 908.90 912.18 915.46 5918.74 922.02 5925.30 5928.58 5931.87 5935.15 1810 938.43 941.71 944.99 948.27 5951.55 954.83 5958.11 5961.39 5964.67 5967.96 1820 971.24 974.52 977.80 981.08 5984.36 987.64 5990.92 5994.20 5997.48 6000.76 1830 004.05 007.33 010.61 013.89 6017.17 020.45 6023.73 6027.01 6030.29 6033.57 1840 036.85 040.14 043.42 046.70 049.98 053.26 6056.54 6059.82 6063.10 6066.38 1850 069.66 072.94 076.23 079.51 082.79 086.07 6089.35 6092.63 6095.91 6099.19 1860 102.47 105.75 109.03 112.32 115.60 118.88 6122.16 6125.44 6128.72 6132.00 1870 135.28 138.56 141.84 145.12 6148.40 151.69 6154.97 6158.25 6161.53 6164.81 1880 168.09 171.37 174.65 177.93 181.21 184.49 6187.78 6191.06 6194.34 6197.62 1890 200.90 204.18 207.46 210.74 214.02 217-30 6220.58 6223.87 227.15 230.43 1900 233.71 236.99 240.27 243.55 246.83 250.11 6253.39 6256.67 259.96 263.24 1910 266.52 269.80 273.08 276.36 279.64 282.92 6286.20 6289.48 292.76 296.05 1920 299.33 302.61 305.89 309.17 312.45 315.73 6329.01 6322.29 325.57 328.85 1930 332.14 335.42 338.70 341.98 345.26 348.54 6351.82 6355.10 358.38 361.66 1940 364.94 368.23 371.51 374.79 378.07 381.35 6384.63 6387.91 391.19 394.47 1930 397.75 401.03 404.32 407.60 410.88 414.16 6417.44 6420.72 424.00 427.28 1960 430.56 433.84 437.12 440.41 443.69 446.97 6450.25 6453.53 456.81 460.09 1970 463.37 466.65 469.93 473.21 476.49 479.78 6483.06 6486.34 489.62 492.90 1980 6196.18 499.46 502.74 506.02 6509.30 512.58 6515.87 6519.15 6522.43 525.71 1990 6528.99 532.27 535.55 538.83 6542.11 545.39 6548.67 6551.96 6555.24 6558.52 2000 6561.80 565.08 568.36 571.64 6574.92 578.20 6581.48 6584.76 6588.05 6591.33 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 124 CONVERSION OF METRES INTO ENGLISH FEET AND DECIMALS. 2OOO to 3399. t Ij Metres. Metre*. (Units) 0. 1. Eng.Feet. 6565.08 2. 3. 4. 5. 6. 7. 8. 9. 2000 Eng.Feet. 6561.80 Eng.Feet. 6568.36 Eng.Feet. 6571.64 Eng.Feet. 6574.92 Eng.Feet. 6578.20 Eng.Feet. 6581.48 Eng.Fefit 6584.76 Eng.Feet. 6588.05 Eng.Feet. 6591.33 2010 6594.61 6597.89 6601.17 6604.45 6607.73 6611.01 6614.29 6617.57 6620.85 6624.14 2020 6627.42 6630.70 6633.98 6637.26 6640.54 6643.82 6647.10 6650.38 6653.66 6656.94 2030 6660.23 6663.51 6666.79 6670.07 6673.35 6676.63 6679.91 6683.19 6686.47 6689.75 2040 6693.03 6696.32 6699.60 6702.88 6706.16 6709.44 6712.72 6716.00 6719.28 6722.56 2050 6725.84 6729.12 6732.41 6735.69 6738.97 6742.25 6745.53 6748.81 6752.09 6755.37 2060 6758.65 6761.93 6765.21 6768.49 6771.78 6775.06 6778.34 6781.62 6784.90 6788.18 2070 6791.46 6794.74 6798 02 6801.30 6804.58 6807.87 6811.15 6814.43 6817.71 6820.99 2080 6824.27 6827.55 6830.83 6834.11 6837.39 6840.67 6843.961 6847.24 6850.52 6853.80 2090 6857.08 6860.36 6863.64 6866.92 6870.20 6873.48 6876.76 6880.05 6883.33 6886.61 2100 6889.89 6893.17 6896.45 6899.73 6903.01 6906.29 6909.57 6912.85 6916.14 6919.42 2110 6922.70 6925.98 6929.26 6932.54 6935.82 6939.10 6942.38 6945.66 6948.94 6952.23 2120 6955.51 6958.79 6962.07 6965.35 6968.63 6971.91 6975.19 6978.47 6981.75 6985.03 2130 6988.32 6991.60 6994.88 6998.16 7001.44 7004.72 7008.00 7011.28 7014.56 7017.84 2140 7021.12 7024.41 7027.69 7030.97 7034.25 7037.53 7040.81 7044.09 7047.37 7050.65 2150 7053.93 7057.21 7060.49 7063.78 7067.06 7070.34 7073.62 7076.90 7080.18 7083.46 2160 7086.74 7090.02 7093.30 7096.58 7099.87 7103.15 7106.43 7109.71 7112.99 7116.27 2170 7119.55 7122.83 7125.11 7129.39 7132.67 7135.96 7139.24 7142.52 7145.80 7149.08 2180 7152.36 7155.64 7158.92 7162.20 7165.48 7168.76 7172.05 7175.33 7178.61 7181.89 2190 7185.17 7188.45 7191.73 7195.01 7198.29 7201.57 7204.85 7208.14 7211.42 7214.70 2200 7217.98 7221.26 7224.54 7227.82 7231.10 7234.38 7237.66 7240.94 7244.23 7247.51 2210 7250.79 7254.07 7257.35 7260.63 7263.91 7267.19 7270.47 7273.75 7277.03 7280.32 2220 7283.60 7286.88 7290.16 7293.44 7296.72 7300.00 7303.28 7306.56 7309.84 7313.12 2230 7316.41 7319.69 7322.97 7326.25 7329.53 7332.81 7336.09 7339.37 7342.65 7345.93 2240 7349.21 7352.49 7355.78 7359.06 7362.34 7365.62 7368.90 7372.18 7375.46 7378.74 2250 7382.02 7385.30 7388.58 7391.87 7395.15 7398.43 7401.71 7404.99 7408.27 7411.55 2260 7414.83 7418.11 7421.39 7424.67 7427.96 7431.24 7434.52 7437.80 7441.08 7444.36 2270 7447.64 7450.92 7454.20 7457.48 7460.76 7464.05 7467.33 7470.61 7473.89 7477.17 2280 7480.45 7483.73 7487.01 7490.29 7493.57 7496.85 7500.14 7503.42 7506.70 7509.98 2290 7513.26 7516.54 7519.82 7523.10 7526.38 7529.66 7532.94 7536.23 7539.51 7542.79 2300 7546.07 7549.35 7552.64 7555.91 7559.19 7562.47 7565.75 7569.03 7572.32 7575.60 2310 7578.88 7582.16 7585.44 7588.72 7592.00 7595.28 7598.56 7601.84 7605.12 7608.41 2320 7611.69 7614.97 7618.25 7621.53 7624.81 7628.09 7631.37 7634.65 7637.93 7641.21 2330 7644.50 7647.78 7651.06 7654.34 7657.62 7660.90 7664.18 7667.46 7670.74 7674.02 2340 7677.30 7680.58 7683.87 7687.15 7690.43 7693.71 7696.99 7700.27 7703.55 7706.83 2350 7710.11 7713.39 7716.67 7719.96 7723.24 7726.52 7729.80 7733.08 7736.36 7739.64 2360 7742.92 7746.20 7749.48 7752.76 7756.05 7759.33 7762.61 7765.89 7769.17 7772.45 2370 7775.73 7779.01 7782.29 7785.57 7788.85 7792.14 7795.42 7798.70 7801.98 7805.26 2380 7808.54 7811.82 7815.10 7818.38 7821.66 7824.94 7828.23 7831.51 7834.79 7838.07 2390 7841.35 7844.63 7847.91 7851.19 7854.47 7857.75 7861.03 7864.32 7867.60 7870.88 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. D 125 CONVERSION OF METRES INTO ENGLISH FEET AND DECIMALS. 2400 to 2799. Metres. (Units) o. 1. 2. 3. 4. 5. 6. 7. 8. 9. Eng.Feet. Eng.Feet. Eng.Feet. Eng.Feet. Eng.Feet. Sng.Feet. Eng.Feet. Eng.Feet. Eng.Feet. Eng.Feet. 2400 7874.16 7877.44 7880.72 7884.00 7887.28 7890.56 7893.84 7897.12 7900.41 7903.69 2410 7906.97 7910.25 7913.53 7916.81 7920.09 7923.37 7926.65 7929.93 7933.21 7936.50 2420 7939.78 7943.06 7946.34 7949.62 7952.90 7956.18 7959.46 7962.74 7966.02 7969.30 2430 7972.59 7975.87 7979.15 7982.43 7985.71 7988.99 7992.27 7995.55 7998.83 8002.11 2440 8005.39 8008.67 8011.96 8015.24 8018.52 8021.80 8025.08 8028.36 8031.64 8034.92 2450 8038.20 8041.48 8044.76 8048.05 8051.33 8054.61 8057.89 8061.17 8064.45 8067.73 2460 8071.01 8074.29 8077.57 8080.85 8084.14 8087.42 8090.70 8093.98 8097.26 8100.54 2470 8103.82 8107.10 8110.38 8113.66 8116.94 8120.22 8123.51 8126.79 8130.07 8133.35 2480 8136.63 8139.91 8143.19 8146.47 8149.75 8153.03 8156.32 8159.60 8162.88 8166.16 2490 8169.44 8172.72 8176.00 8179.28 8182.56 8185.84 8189.12 8192.41 8195.69 8198.97 2500 8202.25 8205.53 8208.81 8212.09 8215.37 8218.65 8221.93 8225.21 8228.50 8231.78 2510 8235.06 8238.34 8241.62 8244.90 8248.18 8251.46 8254.74 8258.02 8261.30 8264.59 2520 8267.87 8271.15 8274.43 8277.71 8280.99 8284.27 8287.55 8290.83 8294.11 8297.39 2530 8300.67 8303.96 8307.24 8310.52 8313.80 8317.08 8320.36 8323.64 8326.92 8330.20 2540 8333.48 8336.76 8340.05 8343.33 8346.61 8349.89 8353.17 8356.45 8359.73 8363.01 2550 8366.29 8369.37 8372.85 8376.14 8379.42 8382.70 8385.98 8389.26 8392.54 8395.82 2560 8399.10 8402.38 8405.66 8408.94 8412.23 8415.51 8418.79 8422.07 8425.35 8428.63 2570 8431.91 8435.19 8438.47 8441.75 8445.03 8448.32 8451.60 8454.88 8458.16 8461.44 2580 8464.72 8468.00 8471.28 8474.56 8477.84 8481.12 8484.41 8487.69 8490.97 8494.25 2590 8497.53 8500.81 8504.09 8507.37 8510.65 8513.93 8517.21 8520.50 8523.78 8527.06 2600 8530.34 8533.62 8536.90 8540.18 8543.46 8546.74 8550.02 8553.30 8556.58 8559.87 2610 8563.15 8566.43 8569.71 8572.99 8576.27 8579.55 8582.83 8586.11 8589.39 8592.67 2620 8595.96 8599.24 8602.52 8605.80 8609.08 8612.36 8615.64 8618.92 8622.20 8625.48 2630 8628.76 8632.05 8635.33 8638.61 8641.89 8645.17 8648.45 8651.73 8655.01 8658.29 2640 8661.57 8664.85 8668.14 8671.42 8674.70 8677.98 8681.26 8684.54 8687.82 8691.10 2650 8694.38 8697.66 8700.94 8704.23 8707.51 8710.79 8714.07 8717.35 8720.63 8723.91 2660 8727.19 8730.47 8733.75 8737.03 8740.32 8743.60 8746.88 8750.16 8753.44 8756.72 2670 8760.00 8763.28 8766.56 8769.84 8773.12 8776.41 8779.69 8782.97 8786.25 8789.53 2680 8792.81 8796.09 8799.37 8802.65 8805.93 8809.21 8812.50 8815.78 8819.06 8822.34 2690 8825.62 8828.90 8832.18 8835.46 8838.74 8842.02 8845.30 8848.59 8851.87 8855.15 2700 8858.43 8861.71 8864.99 8868.27 8871.55 8874.83 8878.11 8881.39 8884.67 8887.96 2710 8891.24 8894.52 8897.80 8901.08 8904.36 8907.64 8910.92 8914.20 8917.48 8920.76 2720 8926.05 8927.33 8930.61 8933.89 8937.17 8940.45 8943.73 8947.01 8950.29 8953.57 2730 8956.85 8960.14 8963.42 8966.70 8969.98 8973.26 8976.54 8979.82 8983.10 8986.38 2740 8989.66 8992.94 8996.23 8999.51 9002.79 9006.07 9009.35 9012.63 9015.91 9019.19 2750 9022.47 9025.75 9029.03 9032.32 9035.60 9038.88 9042.16 9045.44 9048.72 9052.00 2760 9055.28 9058.56 9061.84 9065.12 9068.41 9071.69 9074.97 9078.25 9081.53 9084.81 2770 9088.09 9091.37 9094.65 9097.93 9101.21 9104.50 9107.78 9111.06 9114.34 9117.62 2780 9120.90 9124.18 9127.46 9130.74 9134.02 9137.30 9140.59 9143.87 9147.15 9150.43 2790 9153.71 9156.99 9160.27 9163.55 9166.83 9170.11 9173.39 9176.68 9179.96 9183.24 0. 1. 2. 3. 4. 5. 6, 7. §. 9. 126 CONVERSION OF METRES INTO ENGLISH FEET AND DECIMALS. 2800 to 3000. Metres. Metres. (Units.) 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 2800 Eng.Feet. 9186.52 Eng.Feet, 9189.80 Eng.Feet. 9193.08 Eng.Feet. 9196.36 Eng.Feet. 9199.64 Eng.Feet. 9202.92 Eng.Feet. 9206.20 Eng.Feet. 9209.48 Eng.Feet. 9212.76 Eng.Feet. 9216.05 2810 9219.33 9222.61 9225.89 9229.17 9232.45 9235.73 9239.01 9242.29 9245.57 9248.85 2820 9252.14 9255.42 9258.70 9261.98 9265.26 9268.54 9271.82 9275.10 9278.38 9281.66 2830 9284.94 9288.23 9291.51 9294.79 9298.07 9301.35 9304.64 9307.91 9311.19 9314.47 2840 9317.75 9321.03 9324.32 9327.60 9330.88 9334.16 9337.44 9340.72 9344.00 9347.28 2850 9350.56 9353.84 9357.12 9360.41 9363.69 9366.97 9370.25 9373.53 9376.81 9380.09 2860 9383.37 9386.65 9389.93 9393.21 9396.50 9399.78 9403.06 9406.34 9409.62 9412.90 2870 9416. 18 9419.46 9422.74 9426.02 9429.30 9432.59 9435.87 9439.15 9442.43 9445.71 2880 9448.99 9452.27 9455.55 9458.83 9462.11 9465.39 9468.68 9471.96 9475.24 9478.52 2890 9481.80 9485.08 9488.36 9491.64 9494.92 9498.20 9501.48 9504.76 9508.05 9511.33 2900 9514.61 9517.89 9521.17 9524.45 9527.73 9531.01 9534.29 9537.57 9540.85 9544.14 2910 9547.42 9550.70 9553.98 9557.26 9560.54 9563.82 9567.10 9570.38 9573.66 9576.94 2920 9580.23 9583.51 9586.79 9590.07 9593.35 9596.63 9599.91 9603.19 9606.47 9609.75 2930 9613.03 9616.32 9619.60 9622.88 9626.16 9629.44 9632.72 9636.00 9639.28 9642.56 2940 9645.84 9649.12 9652.41 9655.69 9658.97 9662.25 9665.53 9668.81 9672.09 9675.37 2950 9678.62 9681.93 9685.21 9688.50 9691.78 9695.06 9698.34 9701.62 9704.90 9708.18 2960 9711.46 9714.74 9718.02 9721.30 9724.59 9727.87 9731.15 9734.43 9737.71 9740.99 2970 9744.27 9747.55 9750.83 9754.11 9757.39 9760.68 9763.96 9767.24 9770.52 9773.80 2980 9777.08 9780.36 9783.64 9786.92 9790.20 9793.48 9796.76 9800.05 9803.33 9806.61 2990 9809.89 9813.17 9816.45 9819.73 9823.01 9826.29 9829.57 9832.85 9836.14 9839.42 3000 9842.70 9845.98 9849.26 9852.54 9855.82 9859.10 9862.38 9865.66 9868.94 9872.23 Proportional Parts. Metres. Decimetres. 0. 1. 2. 3. 4. Eng.Feet. 1.3124 5. 6. 7. 8. 9. 0 Eng.Feet. 0.0000 Eng.Feet. 0.3281 Eng.Feet. 0.6562 Eng.Feet. 0.9843 Eng.Feet. 1.6404 Eng.Feet. 1.9685 Eng.Feet. 2.2966 Eng.Feet. 2.6247 Eng.Feet. 2.9528 1 3.2809 3.6090 3.9371 4.2652 4.5933 4.9213 5.2494 5.5775 5.9056 6.2337 2 6.5618 6.8899 7.2180 7.5461 7.8742 8.2022 8.5303 8.8584 9.1865 9.5146 3 9.8427 10.1708 10.4989 10.8270 11.1551 11.4831 11.8112 12.1393 12.4674 12.7955 4 13.1236 13.4517 13.7798 14.1079 14.4360 14.7640 15.0921 15.4202 15.7483 16.0764 5 16.4045 16.7326 17.0607 17.3888 17.7169 18.0449 18.3730 18.7011 19.0292 19.3573 6 19.6854 20.0135 20.3416 20.6697 20.9978 21.3258 21.6539 21.9820 22.3101 22.6382 7 22.9663 23.2944 23.6225 23.9506 24.2787 24.6067 24.9348 25.2629 25.5910 25.9191 8 26.2472 26.5753 26.9034 27.2315 27.5596 27.8876 28.2157 28.5438 28.8719 29.2000 9 29.5281 29.8562 30.1843 30.5124 30.8405 31.1685 31.4966 31.8247 31.1528 32.4809 9. 0. 1. 2. 3. 4. 5. 6. 7. 8. D 127 VIII. CONVERSION OF METRES INTO AMERICAN FEET AND DECIMALS. 1 Metre = 3.28070878 American Feet. Metres. Hundreds. Thousands. 0. 100. 2OO. 300. 400. 5OO. 600. 700. soo. 9OO. AmFeet Am Feet Am. Feet. AmFeet Am. Feet Am.Feet Am.Feet. Am.Feet. Am.Feet Am.Feet 0 0.0 323.1 656.1 984.2 1312.3 1640.4 1968.4 2296.5 2624.6 2952.6 1000 3280.7 3608.8 3936.9 4264.9 4593.0 4921.1 5249.1 5577.2 5905.3 6233.3 2000 6561.4 6889.5 7217.6 7545.6 7873.7 8201.8 8529.8 8857.9 9186.0 9514.1 3000 9842.1 10170.2 10498.3 10826.3 11154.4 11482.5 11810.6 12138.6 12466.7 12794.8 4000 13122.8 13450.9 13779.0 14107.0 14435.1 14763.2 15091.3 15419.3 15747.4 16075.5 5000 16403.5 16731.6 17059.7 17387.8 17715.8 18043.9 18372.0 16700.0 19028.1 19356.2 6000 196S4.3 20012.3 20340.4 20668.5 20996.5 21324.6 21652.7 21980.7 22308.8 22636.9 7000 22965.0 23293.0 23621.1 23949.2 24277.2 24605.3 24933.4 25261.5 25589.5 25917.6 8000 26245.7 26573.7 26901.8 27229.9 27558.0 27886.0 28214.1 28542.2 28870.2 29198.3 9000 29526.4 29854.4 30182.5 30510.6 80838.7 31166.7 31494.8 31822.9 32150.9 32479.0 Units. Tens. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Am Feet AmFeet. AmFeet Am. Feet. Am. Feet Am Feet. Am.Feet Am.Feet. Am Feet. AmFeet 0 0.000 3.281 6.561 9.842 13.123 16.404 19.684 22.965 26.246 29.526 10 32.807 36.088 39.369 42.649 45.930 49.211 52.491 55.772 59.053 62.333 20 65.614 68.895 72.176 75.456 78.737 82.018 85.298 88.579 91.860 95.141 30 98.421 191.702 104.983 108.263 111.544 114.825 118.106 121.386 124.667 127.948 40 131.228 134.509 137.790 141.070 144.351 147.632 150.913 154.193 157.474 160.755 50 164.035 167.316 170.597 173.878 177.158 180.439 183.720 187.000 190.281 193.562 60 196.843 200.123 203.404 206.685 209.965 213.246 216.527 219.807 223.088 226.369 70 229.650 232.930 236.211 239.492 242.772 246.053 249.334 252.615 255.895 259.176 80 262.457 265.737 269.018 272.299 275.580 278.860 282.141 285.422 288.702 291.983 90 295.264 298.544 301.825 305.106 308.387 311.667 314.948 318.229 321.509 324.790 IX. CONVERSION OF METRES INTO RHINE OR PRUSSIAN FEET AND DECIMALS. 1 Metre = 3 1861995 Rhine Feet. Hundreds. Metres. Thousands 0. 1OO. 200. 300. 400. 500. 600. 700. §00. 900. Rhine Ft. Rhine Ft. Rhine Ft Rhine Ft Rhine Ft. Rhine Ft Rhine Ft. Rhine Ft. Rhine Ft. Rhine Ft. 0 0.0 318.6 637.2 955.9 1274.5 1593.1 1911.7 2230.3 2549.0 2867.6 1000 3186.2 3504.8 3823.4 4142.1 4460.7 4779.3 5097.9 5416.5 5735.2 6053.8 2000 6372.4 6691.0 7009.6 7328.3 7646.9 7965.5 8284.1 8602.7 8921.4 9240.0 3000 9558.6 9877.2 10195.8 10514.5 10833.1 11151.7 11470.3 11788.9 12107.6 12426.2 4000 12744.8 13063.4 13382.0 13700.7 14019.3 14337.9 14656.5 14975.1 15293.8 15612.4 5000 15931.0 16249.6 16568.2 16886.9 17205.5 17524.1 17842.7 18161.3 18480.0 18798.6 6000 19117.2 19435.8 19754.4 20073.1 20391.7 20710.3 21028.9 21347.5 21666.2 21984.8 7000 22303.4 22622.0 22940.6 23259.3 23577.9 23896.5 24215.1 24533.7 24852.4 25171.0 8000 25489.6 25808.2 26126.8 26445.5 26764.1 27082.7 27401.3 27719.9 28038.6 28357.2 9000 28675.8 28994.4 29313.0 29631.7 29950.3 30268.9 30587.5 30906.1 31224.8 31543.4 D 128 TO CONVERT PARIS OR FRENCH FEET INTO DIFFERENT MEASURES OF LENGTH. X. CONVERSION OF PARIS OR FRENCH FEET INTO TOISES. 1 French Foot = 0.1666666 Toise. FrenchFeet. Thousands. Hundreds. o. 1OO. 200. 3OO. too. 5OO. 600. 700. 8OO. 90O. 0 Toises. 0.00 Toises. 16.67 Toises. 33.33 Toises. 50.00 Toises. 66.67 Toises 83.33 Toises. 100.00 Toises. 116.67 Toises. 133.33 Toises- 150.00 1000 166.67 183.33 200.00 216.67 233.33 250.00 266.67 283.33 300.00 316.67 2000 333.33 350.00 366.67 383.33 400.00 416.67 433.33 450.00 466.67 483.33 3000 500.00 516.67 533.33 550.00 566.67 583.33 600.00 616.67 633.33 650.00 4000 666.67 683.33 700.00 716.67 733.33 750.00 766.67 783.33 800.00 816.67 5000 833.33 850.00 866.67 883.33 900.00 916.67 933.33 950.00 966.67 983.33 6000 1000.00 1016.67 1033.33 1050.00 1066.67 1083.33 1100.00 1116.67 1133.33 1150.00 7000 1166.67 1183.33 1200.00 1216.67 1233.33 1250.00 1266.67 1283.33 1300.00 1316.67 8000 1333.33 1350.00 1366.67 1383.33 1400.00 1416.67 1433.33 1450.00 1466.67 1483.33 9000 1500.00 1516.67 1533.33 1550.00 1566.67 1583.33 1600.00 1616.67 1633.33 1650.00 10000 1666.67 1683.33 1700.00 1716.67 1733.33 1750.00 1766.67 1783.33 1800.00 1816.67 11000 1833.33 1850.00 1866.67 1883.33 1900.00 1916.67 1933.33 1950.00 1966.67 1983.33 12000 2000.00 2016.67 2033.33 2050.00 2066.67 2083.33 2100.00 2116.67 2133.33 2150.00 13000 2166.67 2183.33 2200.00 2216.67 2233.33 2250.00 2266.67 2283.33 2300.00 2316.67 14000 2333.33 2350.00 2366.67 2383.33 2400.00 2416.67 2433.33 2450.00 2466.67 2483.33 15000 2500.00 2516.67 2533.33 2550.00 2566.67 2583.33 2600.00 2616.67 2633.33 2650.00 16000 2666.67 2683.33 2700.00 2716.67 2733.33 2750.00 2766.67 2783.33 2800.00 2816^67 17000 2833.33 2850.00 2866.67 2883.33 2900.00 2916.67 2933.33 2950.00 2966.67 2983.33 18000 3000.00 3016.67 3033.33 3050.00 3066.67 3083.33 3100.00 3116.67 3133.33 3150.00 19000 3166.67 3183.33 3200.00 3216.67 3233.33 3250.00 3266.67 3283.33 3300.00 3316.67 20000 3333.33 3350.00 3366.67 3383.33 3400.00 3416.67 3433.33 3450.00 3466.67 3483.33 21000 3500.00 3516.67 3533.33 3550.00 3566.67 3583.33 3600.00 3616.67 3633.33 3650.00 22000 3666.67 3683.33 3700.00 3716.67 3733.33 3750.00 3766.67 3783.33 3800.00 3816.67 23000 3833.33 3850.00 3866.67 3883.33 3900.00 3916.67 3933.33 3950.00 3966.67 3983.33 24000 4000.00 4016.67 4033.33 4050.00 4066.67 4083.33 4100.00 4116.67 4133.33 4150.00 25000 4166.67 4183.33 4200.00 4216.67 4233.33 4250.00 4266.67 4283.33 4300.00 4316.67 26000 4333.33 4350.00 4366.67 4383.33 4400.00 4416.67 4433.33 4450.00 4466.67 4483.33 D 129 XI. CONVERSION OF PARIS OR FRENCH FEET INTO METRES. 1 Paris Foot = 0.32483943 Metres. Hundreds. French Feet. Thousands. 0. 100. 200. 3OO. 400. 5OO. 600. 700. 800. 9OO. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. 0 000.00 32.48 64.97 97.45 129.94 162.42 194.90 227.39 259.87 292.36 1000 324.84 357.32 389.81 422.29 454.78 487.26 519.74 552.23 584.71 617.19 2000 649.68 682.16J 714.65 747.13 779.61 812.10 844.58 877.07 909.55 942.03 3000 974.52 1007.00 1039.49 1071.97 1104.45 1136.94 1169.42 1201.91 1234.39 1266.87 4000 1299.36 1331.84 1364.33 1396.81 1429.29 1461.78 1494.26 1526.75 1559.23 1591.71 5000 1624.20 1656.68 1689.16 1721.65 1754.13 1786.62 1819.10 1851.58 1884.07 1916.55 6000 1949.04 1981.52 2014.00 2046.49 2078.97 2111.46 2143.94 2176.42 2208.91 2241.39 7000 2273.88 2306.36 2338.84 2371.33 2403.81 2436.30 2468.78 2501.26 2533.75 2566.23 8000 2598.72 2631.20 2663.68 2696.17 2728.65 2761.14 2793.62 2826.10 2858.59 2891.07 9000 2923.55 2956.04 2988.52 3021.01 3053.49 3085.97 3118.46 3150.94 3183.43 3215.91 10000 3248.39 3280.88 3313.36 3345.85 3378.33 3410.81 3443.30 3475.78 3508.27 3540.75 11000 3573.23 3605.72 3638.20 3670.69 3703.17 3735.65 3768.14 3800.62 3833.11 3865.59 12000 3898.07 3930.56 3963.04 3995.52 4028.01 4060.49 4092.98 4125.46 4157.94 4190.43 13000 4222.91 4255.40 4287.88 4320.36 4352.85 4385.33 4417.82 4450.30 4482.78 4515.27 14000 4547.75 4580.24 4612.72 4645.10 4677.59 4710.07 4742.56 4775.04 4807.52 4840.01 15000 4872.59 4905.08 4937.56 4970.04 5002.53 5035.01 5067.49 5099.98 5132.46 5164.95 16000 5197.43 5229.91 5262.40 5294.88 5327.37 5359.85 5392.33 5424.82 5457.30 5489.79 17000 5522.27 5554.75 5587.24 5619.72 5652.21 5684.69 5717.17 5749.66 5782.14 5814.63 18000 5847.11 5879.59 5912.08 5944.56 5977.05 6009.53 6042.01 6074.50 6106.98 6139.47 19000 6171.95 6204.43 6236.92 6269.40 6301.88 6334.37 6366.85 6399.34 6431.82 6464.30 20000 6496.79 6529.27 6561.76 6594.24 6626.72 6659.21 6691.69 6724.18 6756.66 6789.14 21000 6821.63 6854.11 6886.60 6919.08 6951.56 6984.05 7016.53 7049.02 7081.50 7113.98 22000 7146.47 7178.95 7211.44 7243.92 7276.40 7308.89 7341.37 7373.86 7406.34 7438.82 23000 7471.31 7503.79 7536.27 7568.76 7601.24 7633.73 7666.21 7698.69 7731.18 7763.66 24000 7796.15 7828.63 7861.11 7893.60 7926.08 7958.57 7991.05 8023.53 8056.02 8088.50 25000 8120.99 8153.47 8185.95 8218.44 8250.92 8283.41 8315.89 8448.37 8380.86 8413.34 26000 8445.83 8478.31 8510.79 8543.28 8575.76 8608.24 8640.73 8673.21 8705.70 8738.18 27000 8770.66 8803.15 8835.63 8868.12 8900.60 8933.08 8965.57 8998.05 9030.54 9063.02 Units. Tens. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. 0 0.0000 0.3248 0.6497 0.9745 1.2994 1.6242 1.9490 2.2739 2.5987 2.9236 10 3.2484 3.5732 3.8981 4.2229 4.5478 4.8726 5.1974 5.5223 5.8471 6.1719 20 6.4968 6.8216 7.1465 7.4713 7.7961 8.1210 8.4458 8.7707 9.0955 9.4203 30 9.7452 10.0700 10.3949 10.7197 11.0445 11.3694 11.6942 12.0191 12.3439 12.6687 40 12.9936 13.3184 13.6433 13.9681 14.2929 14.6178 14.9426 15.2675 15.5923 15.9171 50 16.2420 16.5668 16.8916 17.2165 17.5413 17.8662 18.1910 18.5158 18.8407 19.1655 60 19.4904 19.8152 20.1400 20.4649 20.7897 21.1146 21.4394 21.7642 22.0891 22.4139 70 22.7388 23.0636 23.3884 23.7133 24.0381 24.3630 24.6878 25.0126 25.3375 25.6623 80 25.9872 26.3120 26.6368 26.9617 27.2865 27.6114 27.9362 28.2610 28.5859 28.9107 90 29.2355 29.5604 29.8852 30.2101 30.5349 30.8597 31.1846 31.5094 31.8343 32.1591 D 130 XII. CONVERSION OF PARIS OR FRENCH FEET INTO ENGLISH FEET AND DECIMALS. 1 French Foot = 1.06576527 English Feet. French Feet. Thousands. Hundreds. 0. 100. 2OO. 300. 4OO. 500. 600. TOO. 800. 900. 0 Eng. feet. 0.0 Eng. feet. 106.6 Eng feet. 213.2 Eng feet. 319.7 Eng. feet. 426.3 Eng. feet. 532.9 Eng. feet. 639.5 EDg.feet. 746.0 Eng. feet. 852.6 Eng. feet. 959.2 1000 1065.8 1172.3 1278.9 1385.5 1492.1 1598.6 1705.2 1811.8 1918.4 2025.0 2000 2131.5 2238.1 2344.7 2451.3 2557.8 2664.4 2771.0 2877.6 2984.1 3090.7 3000 3197.3 3303.9 3410.4 3517.0 3623.6 3730.2 3836.8 3943.3 4049.9 4156.5 4000 4263.1 4369.6 4476.2 4582.8 4689.4 4795.9 4902.5 5009.1 5115.7 5222.3 5000 5328.8 5435.4 5542.0 5648.6 5755.1 5861.7 5968.3 6074.9 6181.4 6288.0 6000 6394.6 6501.2 6607.7 6714.3 6820.9 6927.5 7034.1 7140.6 7247.2 7353.8 7000 7460.4 7566.9 7673.5 7780.1 7886.7 7993.2 8099.8 8206.4 8313.0 8419.5 8000 8526.1 8632.7 8739.3 8845.9 8952.4 9059.0 9165.6 9272.2 9378.7 9485.3 9000 9591.9 9698.5 9805.0 9911.6 10018.2 10124.8 10231.3 10337.9 10444.5 10551.1 10000 10657.7 10764.2 10870.8 10977.4 11084.0 11190.5 11297.1 11403.7 11510.3 11616.8 11000 11723.4 11830.0 11936.6 12043.1 12149.7 12256.3 12362.9 12469.5 12576.0 12682.6 12000 12789.2 12895.8 13002.3 13108.9 13215.5 13322.1 13428.6 13535.2 13641.8 13748.4 13000 13855.0 13961.5 14068.1 14174.7 14251.3 14387.8 14494.4 14601.0 14707.6 14814.1 14000 14920.7 15027.3 15133.9 15240.4 15347.0 15453.6 15560.2 15666.8 15773.3 15879.9 15000 15986.5 16093.1 16199.6 16306.2 16412.8 16519.4 16625.9 16732.5 16839.1 16945.7 16000 17052.2 17158.8 17265.4 17372.0 17478.6 17585.1 17691.7 17798.3 17904.9 18011.4 17000 18118.0 18224.6 18331.2 18437.7 18544.3 18650.9 18757.5 18864.0 18970.6 19077.2 18000 19183.8 19290.4 19396.9 19503.5 19610.1 19716.7 19823.2 19929.8 20036.4 20143JO 19000 20249.5 20356.1 20462.7 20569.3 20675.8 20782.4 20889.0 20995.6 21102.2 21208.7 20000 21315.3 21421.9 21528.5 21635.0 21741.6 21848.2 22054.8 22161.3 22167.9 22274.5 21000 22381.1 22487.7 22594.2 22700.8 22807.4 22914.0 23020.5 23127.1 23233.7 23340.3 22000 23446.8 23553.4 23660.0 23766.6 23873.1 23979.7 24086.3 24192.9 24299.5 24406.0 23000 24512.6 24619.2 24725.8 24832.3 24938.9 25045.5 25152.1 25258.6 25365.2 25471.8 24000 25578.4 25684.9 25791.5 25898.1 26004.7 26111.3 26217.8 26324.4 26431.0 26537.6 25000 26644.1 26750.7 26857.3 26963.9 27070.4 27177.0 27283.6 27390.2 27496.7 27603.3 26000 27709.9 27816.5 27923.1 28029.6 28136.2 28242.8 28349.4 28455.9 28562.5 28669.1 27000 28775.7 28882.2 28988.8 29095.4 29202.0 29308.5 29415.1 29521.7 29628.3 29734.9 Tens. Units. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0 Eng. feet. 0.000 Eng. feet. 1.066 Eng. feet. 2.132 Eng. feet. 3.197 Eng. feet. 4.263 Eng. feet. 5.329 Eng. feet. 6.395 Eng. feet. 7.460 Ehgfeet. 8.526 Eng. feet 9.592 10 10.658 11.723 12.789 13.855 14.921 15.986 17.052 18.118 19.184 20.250 20 21.315 22.381 23.447 24.513 25.578 26.644 27.710 28.776 29.841 30.907 30 31.973 33.039 34.104 35.170 36.236 37.302 38.368 39.433 40.499 41.565 40 42.631 43.696 44.762 45.828 46.894 47.959 49J025 50.091 51.157 52.223 50 53.288 54.354 55.420 56.486 57.551 58.617 59.683 60.749 61.814 62.880 60 63.946 65.012 66.077 67.143 68.209 69.275 70.341 71.406 72.472 73.538 70 74.604 75.669 76.735 77.801 78.867 79.932 80.998 82.064 83.130 84.195 80 85.261 86.327 87.393 88.459 89.524 90.590 91.656 92.722 93.787 94.853 90 95.919 96.985 98.050 99.116 100.182 101.248 102.313 103.379 104.445 105.511 D 131 XIII. CONVERSION OF PARIS OR FRENCH FEET INTO AMERICAN FEET. 1 French Foot = 1.0657034 American Foot. Hundreds. French Feet Thousands 0. too. 2OO. 300. 400. 5OO. 6OO. 700. 800. 900. Am. Feet Am. Feet Am Feet. Am. Feet. 'Am Feet Am. Feet. Am.Feet Am.Feet. Am.Feet Am.Feet. 0 0.0 106.6 218.1 319.7 426.3 532.9 639.4 746.0 852.6 959.1 1000 1065.7 1172.3 1278.8 1385.4 1492.0 1598.6 1705.1 1811.7 1918.3 2024.8 2000 2131.4 2238.0 2344.5 2451.1 2557.7 2664.3 2770.8 2877.4 2984.0 3090.5 3000 3197.1 3303.7 3410.3 3516.8 3623.4 3730.0 3836.5 3943.1 4049.7 4156.2 4000 4262.8 4369.4 4476.0 4582.5 4689.1 4795.7 4902.2 5008.8 5115.4 5221.9 5000 5328.5 5435.1 5541.7 5648.2 5754.8 5861.4 5967.9 6074.5 6181.1 6287.7 6000 6394.2 6500.8 6607.4 6713.9 6820.5 6927.1 7033.6 7140.2 7246.8 7353.4 7000 7459.9 7566.5 7673.1 7779.6 7886.2 7992.8 8099.3 8205.9 8312.5 8419.1 8000 8525.6 8632.2 8738.8 8845.3 8951.9 9058.5 9165.1 9271.6 9378.2 9484.8 9000 9591.3 9697.9 9804.5 9911.0 10017.6 10124.2 10230.8 10337.3 10443.9 10550.5 10000 10657.0 10763.6 10870.2 10976.7 11083.3 11189.9 11296.5 11403.0 11509.6 11616.2 11000 11722.7 11829.3 11935.9 12042.5 12149.0 12255.6 12362.2 12468.7 12575.3 12681.9 12000 12788.4 12895.0 13001.6 13108.2 13214.7 13321.3 13427.9 13534.4 13641.0 13747.6 13000 13854.1 13960.7 14067.3 14173.9 14280.4 14387.0 14493.6 14600.1 14706.7 14813.3 14000 14919.9 15026.4 15133.0 15239.6 15346.1 15452.7 15559.3 15665.8 15772.4 15879.0 15000 15985-6 16092.1 16198.7 16305.3 16411.8 16518.4 16625.0 16731.5 16838.1 16944.7 16000 17051.3 17157.8 17264.4 17371.0 17477.5 17584.1 17690.7 17797.2 17903.8 18010.4 17000 18117.0 18223.5 18330.1 18436.7 18543.2 18649.8 18756-4 18863.0 18969.5 19076.1 13000 19182.7 19289.2 19395.8 19502.4 19608.9 19715.5 19822.1 19928.7 20035.2 20141.8 19000 20248.4 20354.9 20461.5 20568.1 20674.6 20781.2 20887.8 20994.4 21100.9 21207.5 20000 21314.1 21420.6 21527.2 21633.8 21740.4 21846.9 21953.5 22060.1 22166.6 22273 2 21000 22379.8 22486.3 22592.9 22699.5 22806.1 22912.6 23019.2 23125.8 23232.3 23338.9 22000 23445.5 23552,0 23658.6 23765.2 23871.8 23978.3 24084.9 24191.5 24298.0 24404.6 23000 24511.2 24617.8 24724.3 24830.9 24937.5 25044.0 25150.6 25257.2 25363.7 25470.3 24000 25576.9 25683.5 25790.0 25896.6 26003.2 26109.7 26216.3 26322.9 16429.4 26536.0 25000 26642.6 26749.2 26855.7 26962.3 27068.9 27175.4 27282.0 27388.6 27495.2 27601.7 26000 27708.3 27814.9 27921.4 28028.0 28134.6 28241.1 28347.7 28454.3 28560.9 28667.4 27000 28774.0 28880.6 28987.1 29093.7 29200.3 29306.8 29413.4 29520.0 29626.6 29733.1 28000 29839.7 29946.3 30052.8 30159.4 30266.0 30372.6 30479.1 30585.7 30692.3 30799.8 Units. Tens. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Am. Feet. Am. Feet. Am Feet Am.Feet. Am Feet Am Feet. Am.Feet. Am Feet. Am.Feet Am.Feet. 0 0.00 1.07 2.13 3.20 4.26 5.33 6.39 7.46 8.53 9.59 10 10.66 11.72 12.79 13.85 14.92 15.99 17.05 18.12 19.18 20.25 20 21.31 22.38 23.45 24.51 25.58 26.64 27.71 28.77 29.84 30.91 30 31.97 33.04 34.10 35.17 36.23 37.30 38.37 39.43 40.50 41.56 40 42.63 -13.69 44.76 45.83 46.89 47.96 49.02 50.09 51.15 52.22 50 53.29 54.35 55.42 56.48 57.55 58.61 59.68 60.75 61.81 62.88 60 63.94 65.01 66.07 67.14 68.21 69.27 70.34 71.40 72.47 73.53 70 74.60 75.66 76.73 77.80 78.86 79.93 80.99 82.06 83.12 84.19 80 85.26 86.32 87.39 88.45 89.52 90.58 91.65 92.72 93.78 94.85 90 95.91 96.98 98.04 99.11 100.18 101.24 102.31 103.37 104.44 105.50 TO CONVERT ENGLISH YARDS AND FEET INTO DIFFERENT MEASURES OF LENGTH. XIV. CONVERSION OF ENGLISH YARDS INTO FRENCH TOISES. 1 English Yard = 0.4691465 Toise. English Yards Thousands. Hundreds. 0. 100. 200. 300. 40O. 5OO. 600. •700. 800. 900. Toises. Toises. Toises. Toises. Toises. Toises. Toises Toises. Toises. Toises. 0 0.00 46.91 93.83 140.74 187.66 234.57 281.49 328.40 375.32 422.23 1000 469.15 516.06 562.98 609.89 656.80 703.72 750.63 797.55 844.46 891.38 2000 938.29 985.21 1032.12 1079.04 1125.95 1172.87 1219.78 1266.70 1313.61 1360.52 3000 1407.44 1454.35 1501.27 1548.18 1595.10 1642.01 1688.93 1735.84 1782.76 1829.67 4000 1876.59 1923.50 1970.41 2017.33 2064.24 2111.16 2158.07 2204.99 2251.90 2298.82 5000 2345.73 2392.65 2439.56 2486.48 2533.39 2580.31 2627.22 2674.13 2721.05 2767.96 6000 2814.88 2861.79 2908.71 2955.62 3002.54 3049.45 3096.37 3143.28 3190.20 3237.11 7000 3284.02 3330.94 3377.85 3424.77 3471.68 3518.60 3565.51 3612.43 3659.34 3706.26 8000 3753.17 3800.09 3847.00 3893.92 3940.83 3987.74 4034.66 4081.57 4128.49 4175.40 9000 4222.32 4269.23 4316.15 4363.06 4409.98 4456.89 4503.81 4550.72 4597.63 4644.55 XV. CONVERSION OF ENGLISH YARDS INTO METRES. 1 English Yard = 0.91438348 Metre. English Yards. Thousands. Hundreds. 0. 100. 200. 300. 4OO. 5OO. 6OO. 700. 8OO. 900. Metres'. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. 0 0.00 91.44 182.88 274.32 365.75 457.19 548.63 640.07 731.51 822.95 1000 914.38 1005.82 1097.26 1188.70 1280.14 1371.58 1463.01 1554.45 1645.89 1737.33 2000 1828.77 1920.21 2011.64 2103.08 2194.52 2285.96 2377.40 2468.84 2560.27 2651.71 3000 2743.15 2834.59 2926.03 3017.47 3108.90 3200.34 3291.78 3383.22 3474.66 3566.10 4000 3657.53 3748.97 3840.41 3931.85 4023.29 4114.73 4206.16 4297.60 4389.04 4480.48 5000 4571.92 4663.36 4754.79 4846.23 4937.67 5029.11 5120.55 5211.99 5303.42 5394.86 6000 5486.30 5577.74 5669.18 5760.62 5852.05 5943.49 6034.93 6126.37 6217.81 6309.25 7000 6400.63 6492.12 6583.56 6675.00 6766.44 6857.88 6949.31 7040.75 7132.19 7223.63 8000 9000 7315.07 | 7406.51 8229-45)8320.89 7497.94 8412.33 7589.38 8503.77 7680.82 8595.20 7772.26 8686.64 7863.70 8778.08 7955.14 8869.52 8046.57 8960.96 8138.01 9052.40 133 XVI. CONVERSION OF ENGLISH FEET INTO METKht>. 1 English Foot = 0.30479449 Metre. Hundreds. English Feet. Thousands. 0. 100. 200. 300. 400. 500. 6OO. 700. 800. 900. Metres. Metres. Metres. Metres. . Metres. Metres. Metres. Metres. Metres. Metres. 0 000.000 30.4794 60.9589 91.4383 121.918 152.397 182.877 213.356 243.836 274.315 1000 304.794 335.274 365.763 396.233 426.712 457.192 487.671 518.151 548.630 579.110 2000 609.589 640.068 670.548 701.027 731.507 761.986 792.466 822.945 853.425 883.904 3000 914.383 944.863 975.342 1005.82 1036.30 1066.78 1097.26 1127.74 1158.22 1188.70 4000 1219.18 1249.66 1280.14 1310.62 1341.10 1371.58 1402.05 1432.53 1463.01 1493.49 5000 1523.97 1554.45 1584.93 1615.41 1645.89 1676.37 1706.85 1737.33 1767.81 1798.29 6000 1828.77 1859.25 1889.73 1920.21 1950.68 1981.16 2011.64 2042.12 2072.60 2103.08 7000 2133.56 2164.04 2194.52 2225.00 2255.48 2285.96 2316.44 2346.92 2377.40 2407.88 8000 2438.36 2468.84 2499.31 2529.79 2560.27 2590.75 2621.23 2651.71 2682.19 2712.67 9000 2743.15 2773.63 2804.11 2834.59 2865.07 2895.55 2926.03 2956.51 2986.99 3017.47 10000 3047.94 3078.42 3108.90 3139.38 3169.86 3200.34 3230.82 3261.30 3291.78 3322.26 11000 3352.74 3383.22 3413.70 3444.18 3474.66 3505.14 3535.62 3566.10 3596.57 3627.05 12000 3657.53 3688.01 3718.49 3748.97 3779.45 3809.93 3840.41 3870.89 3901.37 3931.85 13000 3962.33 3992.81 4023.29 4053.77 4084.25 4114.73 4145.21 4175.68 4206.16J4236.64 14000 4267.12 4297.60 4228.08 4358.56 4389.04 4419.52 4450.00 4480.48 4510.96 4541.44 15000 4571.92 4602.40 4632.88 4663.36 4693.84 4724.31 4754.79 4785.27 4815.75 4846.23 16000 4876.71 4907.19 4937.67 4968.15 4998.63 5029.11 5059.59 5090.07 5120.55 5151.03 17000 5181.51 5211.99 5242.47 5272.94 5303.42 5333.90 5364.38 5394.86 5425.34 5455.82 18000 5486.30 5516.78 5547.26 5577.74 5608.22 5638.70 5669.18 5699.66 5730.14 5760.62 19000 5791.10 5821.57 5852.05 5882.53 5913.01 5943.49 5973.97 6004.45 6034.93 6065.41 20000 6095.89 6126.37 6156.85 6187.33 6217.81 6248.29 6278.77 6309.25 6339.73 6370.20 21000 6400.68 6431.16 6461.64 6492.12 6522.60 6553.08 6583.56 6614.04 6644.52 6675.00 22000 6705.48 6735.96 6766.44 6796.92 6827.40 6857.88 6888.36 6918.83 6949.31 6979.79 23000 7010.27 7040.75 7071.23 7101.71 7132.19 7162.67 7193.15 7223.63 7254.11 7284.59 24000 7315.07 7345.55 7376.03 7406.51 7436.99 7467.47 7497.94 7528.42 7558.90 7589.38 25000 7619.86 7650.34 7680.82 7711.30 7741.78 7772.26 7802.74 7833.22 7863.70 7894.18 26000 7924.66 7955.14 7985.62 8016.10 8046.57 8077.05 8107.53 8138.01 8168.49 8198.97 27000 8229.45 8259.93 8290.41 8320.89 8351.37 8381.85 8412.33 8442.81 8473.29 8503.77 28000 8534.25 8564.73 8595.20 8625.68 8656.16 8686.64 8717.12 8747.60 8778.08 8808.56 Units. Tens. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. 0 0.00000 0.30479 0.60959 0.91438 1.21918 1.52397 1.82877 2.13356 2.43836 2.74315 10 3.04794 3.35274 3.65753 3.96233 4.26712 4.57192 4.87671 5.18151 5.48630 5.79110 20 6.09589 6.40068 6.70548 7.01027 7.31507 7.61986 7.92466 8.22945 8.53425 8.83904 30 9.14383 9.44863 9.75342 10.0582 10.3630 10.6678 10.9726 11.2774 11.5822 11.8870 40 12.1918 12.4966 12.8014 13.1062 13.4110 13.7158 14.0205 14.3253 14.6301 14.9349 50 15.2397 15.5445 15.8493 16.1541 16.4589 16.7637 17.0685 17.3733 17.6781 17.9829 60 18.2877 18.5925 18.8973 19.2021 19.5068 19.8116 20.1164 20.4212 20.7260 21.0308 70 21.3356 21.6404 21.9452 22.2500 22.5548 22.8596 23.1644 23.4692 23.7740 21.0788 80 24.3836 24.6884 24.9931 25.2979 25.6027 25.9075 26.2123 26.5171 26.8219 27.1267 90 27.4315 27.7363 28.0411 28.3459 28.6507 28.9555 29.2603 29.5651 29.8699 30.1747 D 134 XVII. CONVERSION OF ENGLISH FEET INTO FRENCH OR PARIS FEET AND DECIMALS. 1 English Foot = 0.9382929 Paris Foot. Hundreds. English Thousands. 0. 100. 2OO. 300. 400. 500. 600. 700. §00. 900. 0 Par.Feet. 000.0 Par.Feet. 93.8 Par.Feet. 187.7 Par. Feet. 281.5 Par. Feet. 375.3 Par.Feet. 469.1 Par.Feet. 563.0 Par.Feet. 656.8 Par. Feet. 750.6 Par.Feet. 844.5 1000 938.3 1032.1 1126.0 1219.8 1313.6 1407.4 1501.3 1595.1 1688.9 1782.8 2000 1876.6 1970.4 2064.2 2158.1 2251.9 2345.7 2439.6 2533.4 2627.2 2721.0 3000 2814.9 2908.7 3002.5 3096.4 3190.2 3284.0 3377.9 3471.7 3565.5 3659.3 4000 3753.2 3847.0 3940.8 4034.7 4128.5 4222.3 4316.1 4410.0 4503.8 4597.6 5000 4691.5 4785.3 4879.1 4973.0 5066.8 5160.6 5254.4 5348.3 5442.1 5535.9 6000 5629.8 5723.6 5817.4 5911.2 6005.1 6098.9 6192.7 6286.6 6380.4 6474.2 7000 6568.0 6661.9 6755.7 6849.5 6943.4 7037.2 7131.0 7224.9 7318.7 7412.5 8000 7506.3 7600.2 7694.0 7787.8 7881.7 7975.5 8069.3 8163.1 8257.0 8350.8 9000 8444.6 8538.5 8632.3 8726.1 8820.0 8913.8 9007.6 9101.4 9195.3 9289.1 10000 9382.9 9476.8 9570.6 9664.4 9758.2 9852.1 9945.9 10039.7 10133.6 10227.4 11000 10321.2 10415.0 10508.9 10602.7 10696.5 10790.4 10884.2 10978.0 11071.9 11165.7 12000 11259.5 11353.3 11447.2 11541.0 11634.8 11728.7 11822.5 11916.3 12010.1 12104.0 13000 12197.8 12291.6 12385.5 12479.3 12573.1 12667.0 12760.8 12854.6 12948.4 13042.3 14000 13136.1 13229.9 13323.8 13417.6 13511.4 13605.2 13699.1 13792.9 13886.7 13980.6 15000 14074.4 14168.2 14262.0 14355.9 14449.7 14543.5 14637.4 14731.2 14825.0 14918.9 16000 15012.7 15106.5 15200.3 15294.2 15388.0 15481.8 15575.7 15669.5 15763.3 15857.1 17000 15951.0 16044.8 16138.6 16232.5 16326.3 16420.1 16514.0 16607.8 16701.6 16795.4 18000 16889.3 16983.1 17076.9 17170.8 17264.6 17358.4 17452.2 17546.1 17639.9 17733.7 19000 17827.6 17921.4 18015.2 18109.0 18202.9 18296.7 18390.5 18484.4 18578.2 18672.0 20000 18765.9 18859.7 18953.5 19047.3 19141.2 19235.0 19328.8 19422.7 19516.5 19610.3 21000 19704.1 19798.0 19891.8 19985.6 20079.5 20173.3 20267.1 20361.0 20454.8 20548.6 22000 20642.4 20736.3 20830.1 20923.9 21017.8 21111.6 21205.4 21299.2 21393.1 21486.9 23000 21580.7 21674.6 21768.4 21862.2 21956.0 22049.9 22143.7 22237.5 22331.4 22425.2 24000 22519.0 22612.9 22706.7 22800.5 22894.3 22988.2 23082.0 23175.8 23269.7 23363.5 . 25000 23457.3 23551.1 23645.0 23738. S 23832.6 23926.5 24020.3 24114.1 24208.0 24301.8 26000 24395.6 24489.4 24583.3 24677.1 24770.9 24864.8 24958.6 25052.4 25146.2 25240.1 27000 25333.9 25427.7 25521.6 25615.4 25709.2 25803.1 25896.9 25990.7 26084.5 26178.4 28000 26272.2 26366.0 26459.9 26553.7 26647.5 26741.3 26835.2 26929.0 27022.8 27116.7 Units. Tens. o. 1. 2. 3. 4. S. 6. 7. 8. 9. Par. Feet. Par. Feet. Par. Feet. Par.Feet. Par. Feet. Par. Feet. Par. Feet. Par.Feet Par.Feet. Par.Feet. 0 0.00 0.94 1.88 2.81 3.75 4.69 5.63 6.57 7.51 8.44 10 9.38 10.32 11.26 12.20 13.14 14.07 15.01 15.95 16.89 17.83 20 18.77 19.70 20.64 21.58 22.52 23.46 24.40 25.33 26.27 27.21 30 28.15 29.09 30.03 30.96 31.90 32.84 33.78 34.72 35.66 36.59 40 37.53 38.47 39.41 40.35 41.28 42.22 43.16 44.10 45.04 45.98 50 46.91 47.85 48.79 49.73 50.67 51.61 52.54 53.48 54.42 55.36 60 56.30 57.24 58.17 59.11 60.05 60.99 61.93 62.87 63.80 64.74 70 65.68 66.62 67.56 68.50 69.43 70.37 71.31 72.25 73.19 74.13 80 75.06 76.00 76.94 77.88 78.82 79.75 80.69 81.63 82.57 83.51 90 84.45 85.38 86.32 87.26 88.20 89.14 90.08 91.01 91.95 92.89 135 XVIII. CONVERSION OF ENGLISH FEET INTO AMERICAN FEET AND DECIMALS. 1 English Foot = 0.99994197 American Foot. Hundreds. Eng. Feet. Thousands. o. 100. 200. 300. 4OO. 500. 6OO. •700. 800. 9OO. Am.Feet Am.Feet. Am.Feet. Am Feet Am.Feet. Am Feet Am Feet. Am.Feet. Am.Feet. Am.Feet 0 0.00 99.99 199.99 299.98 399.98 499.97 599.97 699.96 799.95 899.95 1000 999.94 1099.94 1199.93 1299.92 1399.92 1499.91 1599.91 1699.90 1799.90 1899.89 2000 1999.88 2099.88 2199.87 2299.87 2399.86 2499.85 2599.85 2699.84 2799.84 2899.83 3000 2999.83 3099.82 3199.81 3299.81 3399.80 3499.80 3599.79 3699.79 3799.78 3899.77 4000 3999.77 4099.76 4199.76 4299.75 4399.74 4499.74 4599.73 4699.73 4799.72 4899.72 5000 4999.71 5099.70 5199.70 5299.69 5399.69 5499.68 5599.68 5699.67 5799.66 5899.66 6000 5999.65 6099.65 6199.64 6299.63 6399.63 6499.62 6599.62 6699.61 6799.61 6899.60 7000 6999.59 7099.59 7199.58 7299.58 7399.57 7499.56 7599.56 7699.55 7799.55 7899.54 8000 7999.54 8099.53 8199.52 8299.52 8399.51 8499.51 8599.50 8699.50 8799.49 8899.48 9000 8999.48 9099.47 9199.47 9299.46 9399.45 9499.45 9599.44 9699.44 9799.43 9899.43 10000 9999.42 10099.4 10199.4 10299.4 10399.4 10499.4 10599.4 10699.4 10799.4 10899.4 11000 10999.4 11099.4 11199.4 11299.3 11399.3 11499.3 11599.3 11699.3 11799.3 11899.3 12000 11999.3 12099.3 12199.3 12299.3 12399.3 12499.3 12599.3 12699.3 12799.3 12899.2 13000 12999.2 13099.2 13199.2 13299.2 13399.2 13499.2 13599.2 13699.2 13799.2 13899.2 14000 13999.2 14099.2 14199.2 14299.2 14399.2 14499.2 14599.2 14699.1 14799.1 14899.1 15000 14999.1 15099.1 15199.1 15299.1 15399.1 15499.1 15599.1 15699.1 15799.1 15899.1 The following Table of Differences between English and American Feet, for every hundred feet, will make it easy to convert English into American Feet, or American into English Feet, by adding to, or subtracting from, the number of feet to be converted, which is contained in the first column, the numbers found in the other columns. XIX. DIFFERENCES BETWEEN ENGLISH AND AMERICAN FEET. To obtain English Feet add. To obtain American Feet subtract. 10000 American Feet = 10000.5803 English Feet. Number Hundreds. Number Hundreds. of Feet. Of Feet. Thou- sands. 0. 2OO. 400. 600. 800. Thou- sands. 0. 200. 400. 600. 800. Difffeet Diff.feet Difffeet Diff.feet. Difffeet Diff.feet. Diff.feet Diff.feet Difffeet. Difffeet 0 ±0.000 ±0.012 ±0.023 ±0.035 ±0.046 15000 ±0.870 ±0.882 ±0.894 ±0.905 ±0.917 1000 0.058 0.070 0.082 0.093 0.105 16000 0.928 0.940 0.952 0.963 0.975 2000 0.116 0.128 0.139 0.151 0.162 17000 0.987 0.998 1.010 1.021 1.033 3000 0.174 0.186 0.197 0.209 0.221 18000 1.045 1.056 1.068 1.079 1.091 4000 0.232 0.244 0.255 0.267 0.279 19000 1.103 1.114 1.126 1.137 1.149 5000 0.290 0.302 0.313 0.325 0.337 20000 1.161 1.172 1.184 1.195 1.207 6000 0.348 0.360 0.371 0.383 0.395 21000 1.219 1.230 1.242 1.253 1.265 7000 0.406 0.418 0.429 0.441 0.453 22000 1.277 1.288 1.300 1.311 1.323 8000 0.464 0.476 0.487 0.499 0.511 23000 1.335 1.346 1.358 1.370 1.381 9000 0.522 0.534 0.546 0.557 0.569 24000 1.393 1.404 1.416 1.428 1.439 10000 0.580 0.592 0.604 0.615 0.627 25000 1.451 1.462 1.474 1.486 1.497 11000 0.638 0.650 0.662 0.673 0.685 26000 1.509 1.520 1.532 1.544 1.555 12000 0.696 0.708 0.720 0.731 0.743 27000 1.567 1.578 1.590 1.602 1.613 13000 0.754 0.766 0.778 0.789 0.801 28000 1.625 1.636 1.648 1.660 1.671 14000 0.812 0.824 0.836 0.847 0.859 29000 1.683 1.694 1.606 1.718 1.729 136 TO CONVERT AMERICAN YARDS AND FEET * INTO DIFFERENT MEASURES OF LENGTH XX. CONVERSION OF AMERICAN YARDS INTO FRENCH TOISES. 1 American Yard = 0.4691737 Toise. Hundreds. Ameiican Thousands 0. 1OO. 2OO. 3OO. 400. 500. 600. 70O. 800. 900. Toises. 1'oises. Toises. Toises. Toises Toises. Toises Toises. Toises. poises. 0 0.^0 4S.92 93.83 140.75 187.67 234.59 281.50 328.42 375.34 422.26 1000 469.17 516.09 563.01 609.93 656.84 703.76 750.68 797.60 844.51 891.43 2000 938.35 985.26 5032.18 1079.10 1126.02 1172.93 1219.85 1266.77 1313.69 1360.60 3000 1407.52 1454.44 1501-36 1548.27 1595.19 1642.11 1689.02 1735.94 1782.86 1829.78 4000 1876.69 1923.61 1970.53 2017.45 2064.36 2111.28 2158.20 2205.12 2252.03 2298.95 5000 2345.87 2392.79 2439.70 2486.62 2533.54 2580.45 2627.37 2674.29 2721.21 2768.12 6000 2815.04 2861.96 2908.88 2955.79 3002.71 3049.63 3096.55 3143.46 3190.38 3237.30 7000 3284.22 3331.13 3378.05 3424.97 3471.88 3518.80 3565.72 3612.64 3659.55 3706.47 8000 3753.39 3800.31 3847.22 3894.14 S941.06 3987.98 4034.89 4081.81 4128.73 4175.65 9000 4222.56 4269.48 4316.40 4363.31 |4410.23 4457.15 4504.07 4550.98 4597.90 4644.82 XXI. CONVERSION OF AMERICAN YARDS INTO METRES. 1 American Yard = 0.91443655 Metre. Hundreds. American Thousands. 0. 100. 2OO. 300. 400. 500. 6OO. 700. §00. 90O. Metres. Metres. Metres Metres. Metres. Metres. Metres. Metres. Metres. Metres. 0 0.00 91.44 182.89 274.33 365.77 457.22 548.66 640.11 731.55 822.99 1000 914.44 1005.88 1097.32 1188.77 1280.21 1371.65 1463.10 1554.54 1645.99 1737.43 2000 1828.87 1920.32 2011.76 2103.20 2194.65 2286.09 2377.54 2468.98 ;2560.42 2651.87 3000 2743.31 2834.75 2926.20 3017.64 3109.08 3200.53 3291.97 3383.42 3474.86 3566.30 4000 3657.75 3749.19 3840.63 3932.08 4023.52 4114.96 4206.41 4297.85 4389.30 4480.74 5000 4572.18 4663.63 4755.07 4846.51 4937.96 5029.40 5120.84 5212.29 5303.73 5395.18 6000 5486.62 5578.06 5669.51 5760.95 5852.39 5943.84 6035.28 6126.72 6218.17 6309.61 7000 6401.06 6492.50 6583.94 6675.39 6766.83 6858.27 6949.72 7041.16 7132.61 7224.05 8000 7315.49 7406.94 7498.38 7589.82 7681.27 7772.71 7864.15 7955.60 8047.04 8138.49 9000 822993 8321.37 8412.82 8504.26 8595.70 8687.15 8778.59 8870.03 8961.48 9052.92 D 137 XXII. CONVERSION OF AMERICAN FEET INTO METRES. 1 American Foot = 0.30481218 Metre. Hundreds. Amer. Feet. Thousands. 0. 1OO. '200. 300. 400. 500. 6OO. 700. 800. 900. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. 0 0.00 30.48 60.96 91.44 121.92 152.41 182.89 213.37 243.85 274.33 1000 304.81 335.29 365.77 396.26 426.74 457.22 487.70 518.18 548.66 579.14 2000 609.62 640.11 670.59 701.07 731.55 762.03 792.51 822.99 853.47 883.96 3000 914.44 944.92 975.40 1005.88 1036.36 1066.84 1097.32 1127.81 1158.29 1188.77 4000 1219.25 1249.73 1280.21 1310.69 1341.17 1371.65 1402.14 1432.62 1463.10 1493.58 5000 1524.06 1554.54 1585.02 1615.50 1645.99 1676.47 1706.95 1737.43 1767.91 1798.39 6000 1828.87 1859.35 1889.84 1910.32 1940.80 1971.28 2001.76 2032.24 2062.72 2093.20 7000 2123.69 2154.17 2184.65 2225.13 2255.61 2286.09 2316.57 2347.05 2377.54 2408.02 8000 2438.50 2468.98 2499.46 2529.94 2560.42 2590.90 2621.38 2651.87 2682.35 2712.83 9000 2743.31 2773.79 2804.27 2834.75 2865.23 2895.72 2926.20 2956.68 2987.16 3017.64 10000 3048.12 3078.60 3109.08 3139.57 3170.05 3200.53 3231.01 3261.49 3291.97 3322.45 11000 3352.93 3383.42 3413.90 3444.38 3474.86 3505.34 3535.82 3566.30 3596.78 3627.26 12000 3657.75 3688.23 3718.71 3749.19 3779.67 3810.15 3840.63 3871.11 3901.60 3932.08 13000 3962.56 3993.04 4023.52 4054.00 4084.48 4114.96 4145.45 4175.93 4206.41 4236.89 14000 4267.37 4297.85 4328.33 4358.81 4389.30 4419.78 4450.26 4480.74 4511.22 4541.70 15000 4572.18 4602.66 4633.15 4663.63 4694.11 4724.59 4755.07 4785.55 4816.03 4846.51 16000 4876.99 4907.48 4937.96 4968.44 4998.92 5029.40 5059.88 5090.36 5120.84 5151.33 17000 5181.81 5212.29 5242.77 5273.25 5303.73 5334.21 5364.69 5395.18 5425.66 5456.14 18000 5486.62 5517.10 5547.58 5578.06 5608.54 5639.03 5669.51 5699.99 5730.47 5760.95 19000 5791.43 5821.91 5852.39 5882.88 5913.36 5943.84 5974.32 6004.80 6035.28 6065.76 20000 6096.24 6126.72 6157.21 6187.69 6218.17 6248.65 6279.13 6309.61 6340.09 6370.57 21000 6401.06 6431.54 6462.02 6492.50 6522.98 6553.46 6583.94 6614.42 6644.91 6675.39 22000 6705.87 6736.35 6766.83 6797.31 6827.79 6858.27 6888.76 6919.24 6949.72 6980.20 23000 7010.68 7041.16 7071.64 7102.12 7132.61 7163.09 7193.57 7224.05 7254.53 7285.01 24000 7315.49 7345.97 7376.45 7406.94 7437.42 7467.90 7498.38 7528.86 7559.34 7589.82 25000 7620.30 7650.79 7681.27 7711.75 7742.23 7772.71 7803.19 7833.67 7864.15 7894.64 26000 7925.12 7955.60 7986.08 8016.56 8047.04 8077.52 8108.00 8138.49 8168.97 8199.45 27000 8229.93 8260.41 8290.89 8321.37 8351.85 8382.33 8412.82 8443.30 8473.78 8504.26 28000 8534.74 8565.22 8595.70 8626.18 8656.67 8687.15 8717.63 8748.11 8778.59 8809.07 TVna Units. J.6HS. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. 0 0.0000 0.3048 0.6096 0.9144 1.2192 1.5241 1.8289 2.1337 2.4385 2.7433 10 3.0481 3.3529 3.6577 3.9626 4.2674 4.5722 4.8770 5.1818 5.4866 5.7914 20 6.0962 6.4011 6.7059 7.0107 7.3155 7.6203 7.9251 8.2299 8.5347 8.8396 30 9.1444 9.4492 9.7540 10.0588 10.3636 10.6684 10.9732 11.2781 11.5829 11.8877 40 12.1925 12.4973 12.8021 13.1069 13.4117 13.7165 14.0214 14.3262 14.6310 14.9358 50 15.2406 15.5454 15.8502 16.1550 16.4599 16.7647 17.0695 17.3743 17.6791 17.9839 60 18.2887 18.5935 18.8984 19.1032 19.4080 19.7128 20.0176 20.3224 20.6272 20.9320 70 21.2369 21.5417 21.8465 22.2513 22.5561 22.8609 23.1657 23.4705 23.7754 24.0802 80 24.3850 24.6898 24.9946 25.2994 25.6042 25.9090 26.2138 26.5187 26.8235 27.1283 90 27.4331 27.7379 28.0427 28.3475 28.6523 28.9572 29.2620 29.5668 29.8716 30.1764 138 i XXIII. CONVERSION OF AMERICAN FEET INTO PARIS OR FRENCH FEET. 1 American Foot = 0.93834737 Paris Foot. Hundreds. Amer. Feet. Thousands. 0. 100. 300. 300. 400. 500. 600. TOO. 800. 900. Par. Feet. Par.Feet. Par.Feet. Par.Feet. Par.Feet. Par.Feet. Par.Feet. Par.Feet. Par.Feet. Par.Feet. 0 0.0 93.8 187.7 281.5 375.3 469.2 563.0 656.8 750.7 844.5 1000 938.3 1032.2 1126.0 1219.9 1313.7 1407.5 1501.4 1595.2 1689.0 1782.9 2000 1876.7 1970.5 2064.4 2158.2 2252.0 2345.9 2439.7 2533.5 2627.4 2721.2 3000 2815.0 2908.9 3002.7 3096.5 3190.4 3284.2 3378.1 3471.9 3565.7 3659.6 4000 3753.4 3847.2 3941.1 4034.9 4128.7 4222.6 4316.4 4410.2 4504.1 4597.9 5000 4691.7 4785.6 4879.4 4973.2 5067.1 5160.9 5254.7 5348.6 5442.4 5536.2 6000 5630.1 5723.9 5817.8 5911.6 6005.4 6099.3 6193.1 6286.9 6380.8 6474.6 7000 6568.4 6662.3 6756.1 6849.9 6943.8 7037.6 7131.4 7225.3 7319.1 7412.9 8000 7506.8 7600.6 7694.4 7788.3 7882.1 7976.0 8069.8 8163.6 8257.5 8351.3 9000 8445.1 8539.0 8632.8 8726.6 8820.5 8914.3 9008.1 9102.0 9195.8 9289.6 10000 9383.5 9477.3 9571.1 9665.0 9758.8 9852.6 9946.5 10040.3 10134.2 10228.0 11000 10321.8 10415.7 10509.5 10603.3 10697.2 10791.0 10884.8 10978.7 11072.5 11166.3 12000 11260.2 11354.0 11447.8 11541.7 11635.5 11729.3 11823.2 11917.0 12010.8 12104.7 13000 12198.5 12292.3 12386.2 12480.0 12573.9 12667.7 12761.5 12855.4 12949.2 13043.0 14000 13136.9 13230.7 13324.5 13418.4 13512.2 13606.0 13699.9 13793.7 13887.5 13981.4 15000 14075.2 14169.0 14262.9 14356.7 14450.5 14544.4 14638.2 14732.1 14825.9 14919.7 16000 15013.6 15107.4 15201.2 15295.1 15388.9 15482.7 15576.6 15670.4 15764.2 15858.1 17000 15951.9 16045.7 16139.6 16233.4 16327.2 16421.1 16514.9 16608.7 16702.6 16796.4 18000 16890.3 16984.1 17077.9 17171.8 17265.6 17359.4 17453.3 17547.1 17640.9 17734.8 19000 17828.6 17922.4 18016.3 18110.1 18203.9 18297.8 18391.6 18485.4 18579.3 18673.1 20000 18766.9 18860.8 18954.6 19048.4 19142.8 19236.1 19330.0 19423.8 19517.6 19611.5 21000 19705.3 19799.1 19893.0 19986.8 20080.6 20174.5 20268.3 20362.1 20456.0 20549.8 22000 20643.6 20737.5 20831.3 20925.1 21019.0 21112.8 21206.6 21300.5 21394.3 21488.2 23000 21582.0 21675.8 21769.7 21863.5 21957.3 22051.2 22145.0 22238.8 22332.7 22426.5 24000 22520.3 22614.2 22708.0 22801.8 22895.7 22989.5 23083.3 23177.2 23271.0 23364.8 25000 23458.7 23552.5 23646.4 23740.2 23834.0 23927.9 24021.7 24115.5 24209.4 24303.2 26000 24397.0 24490.9 24584.7 24678.5 24772.4 24866.2 24960.0 25053.9 25147.7 25241.5 27000 25335.4 25429.2 25523.0 25616.9 25710.7 25804.5 25898.4 25992.2 26086.1 26179.9 28000 26273.7 26367.6 26461.4 26555.2 26649.1 26742.9 26836.7 26930.6 27024.4 27118.2 Units. Tens. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. Par. Feet. Par.Feet. Par.Feet. Par.Feet. Par.Feet. Par.Feet. Par.Feet. Par.Feet Par Feet Par.Feet 0 0.00 0.94 1.88 2.82 3.75 4.69 5.63 6.57 7.51 8.45 10 9.38 10.32 11.26 12.20 13.14 14.08 15.01 15.95 16.89 17.83 20 18.77 19.71 20.64 21.58 22.52 23.46 24.40 25.34 26.27 27.21 30 28.15 29.09 30.03 30.97 31.90 32.84 33.78 34.72 35.66 36.60 40 37.53 38.47 39.41 40.35 41.29 42.23 43.16 44.10 45.04 45.98 50 46.92 47.86 48.79 49.73 50.67 51.61 52.55 53.49 54.42 55.36 60 56.30 57.24 58.18 59.12 60.05 60.99 61.93 62.87 63.81 64.75 70 65.68 66.62 67.56 68.50 69.44 70.38 71.31 72.25 73.19 74.13 80 75.07 76.01 76.94 77.88 78.82 79.76 80.70 81.64 82.57 83.51 90 84.45 85.39 86.33 87.27 88.20 89.14 90.08 91.02 91.96 92.90 D 139 TO CONVERT KLAFTER AND FEET OF VIENNA INTO DIFFERENT MEASURES OF LENGTH. 1 KLAFTER OF VIENNA ~ 6 FEET OF VIENNA =. 0.9730317 TOISE DIT P^ROU. From this value are derived the equations used in computing the following tables. XXIV. CONVERSION OF KLAFTER OF VIENNA INTO FRENCH TOISES. 1 Klafter = 0.9730317 Toise. Klafter of Hundreds. Thousands. 0. 100. 200. 300. 400. 5OO. 6OO. 7OO. 8OO. 900. Toises. Toises. Toises. Toises. Toises. Toises. Toises. Toises Toises. Toises. 0 0-00 97.30 194.61 291.91 389.21 486.52 583.82 681.12 778.43 875.73 1000 973.03 1070.33 1167.64 1264.94 1362.24 1459.55 1556.85 1654.15-1751.46 1848.76 2000 1946.06 2043.37 2140.67 2237.97 2335.28 2432.58 2529.88 2627.192724.492821.79 3000 2919.10 3016.40 3113.70 3211.00 3308.31 3405.61 3502.91 3600.22 3697.52 3794.82 4000 3392.133939.43 4036.73 4184.04 4281.34 4378.64 4475.95 4573.25 4670.55 4767.86 5000 4865.16 4962.46 5059.76 5157.07 5254.37 5351.67 5448.98 5546.28 5643.58 5740.89 Units. Klafter. Tens. o. 1. 2. 3. 4. 5. 6. 7. 8. 9. Toises. Toises. Toises. Toises. Toises. Toises. Toises. Toises. Toises. Toises. 0 0.000 0.973 1.946 2.919 3.892 4.865 5.838 6.811 7.784 8.757 10 9.730 10.703 11.676 12.649 13.622 14.595 15.569 16.542 17.515 18.488 20 19.461 20.434 21.407 22.380 23.353 24.326 25.299 26.272 27.245 28.218 30 29.191 30.164 31.137 32.110 33.083 34.036 35.029 36.002 36.975 37.948 40 33.921 39.894 40.867 41.840 42.813 43.786 44.759 45.732 46.706 47.679 50 48.652 49.625 50.598 51.571 52.544 53.517 54.490 55.463' 56.436 57.409 60 58.382 59.355 60.328 61.301 62.274 63.247 64.220 65.193 66.166 67.139 70 68.112 69.065 70.058 71.031 72.004 72.977 73.950 74.923 75.896 76.870 80 77.843 78.816 79.789 80.762 81.735 82.708 83.681 84.654 85.627 86.600 90 87.573 88.546 89.519 90.492 91.465 92.438 93.411 94.384 95.357 96.330 D 140 i XXV. CONVERSION OF KLAFTER OF VIENNA INTO METRES. 1 Klaftcr = 1.8964741 Metres. Klafter of Hundreds. Thousands. 0. 10O. 200. 30O. 400. 5OO. 600. 700. §00. 900. ; Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. 0 ; o.oo 189.65 379.29 568.94 758.59 948.24 1137.88 1327.53 1517.18 1706.83! 1000 1896.47 2086.12 2275.77 2465.42 2655.06 2844.71 3034.36 3224.01 3413.65 3603.30 2000 3792.95 3982.60 4172.244361.894551.54 4741.19 4930.83 5120.48 5310.13 5499.77 3000 5689.42 5879.07 6068.72 6258.36 6448.01 6637.66 6827.31 7016.95 7206.60 7396.25 4000 7585.90 7775.54 7965.198154.84!8344.49 8534.138723.788913.43 9103.08 9292.72 Units. Klafter. Tens. o. 1. 2. 3. 4. 5. 6. 7. 8. 9. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres 0 0.000 1.896 3.793 5.689 7.586 9.482 11.379 13.275 15.172 17.068 10 18.965 20.861 22.758 24.654 26.551 28.447 30.344 32.240 34.136 36.033 20 37.929 39.826 41.722 43.619 45.515 47.412 49.308 51.205 53.101 54.998 30 56.894 58.791 60.687 62.584 64.180 66.377 68.273 70.170 72.066 73.962 40 75.859 77.755 79.652 81.548 83.445 85.341 87.238 89.134 91.031 92.927 50 94.824 96.720 93.617 100.513 102.409 104.306 106.203 103.099 109.995 111.892 60 113.788 115.685 117.581 119.478 121.374 123.271 125.167 127.064 128.960 130.857 70 132.753 134.650 136.546 138.443 140.339 142.236 144.132 146.029 147.925 149.821 80 151.718 153.614 155.511 157.407 159.304 161.200 163.097 164.993 166.890 168.786 90 170.683 172.579 174.476 176.372 178.269 130.165 182.062 183.958 185.854 187.751 XXVI. CONVERSION OF KLAFTER OF VIENNA INTO PARIS OR FRENCH FEET. 1 Klafter = 5.8381902 Paris or French Feet. Klafter of Vienna Hundreds. Thousands. 0. 100. 2OO. 3OO. 4OO. 5OO. 600. 700. 80O. 900. Par.Feet. Par.Feet. Par.Feet. Par. Feet. Par.Feet. Par.Feet. Par.Feet. Par.Feet. Par.Feet. Par.Feet. 0 0.00 583.82 1167.64 1751.46 233-3.28 2919.103502.91 4086.73 4670.55 5254.37 1000 583S.19 6422.01 7005.83 7589.65 8173.47 8757.29^341.10 9924.92 10508.7 11092.6 2000 11676.4 12260.2 12844.013427.8 14011.7 14595.5 15179.3 15763.1 16346.9 16930.8 3000 17514.6'l8098.4 18682.2 19266.0 19349.8 20433.7 21017.5 21601.3 22185.1 22768.9 4000 23352.8 23936.6 24520.4 25104.2 23688.0 26271.9 26855.7 27439.5 28023.3 28607.1 Units. Klafter. Tens. O. 1. 2. 3. 4. 5. 6. 7. 8. 9. Par.Feet. Par.Feet. Par.Feet. Par.Feet. Par.Feet. Par.Feet. Par.Feet. Par.Feet. Par.Feet. Par.Feet. ', 0 0.00 5.84 11.63 17.51 23.35 29.19 35.03 40.87 46.71 52.54 10 53.38 64.22 70.06 75.90 81.73 87.57 93.41 99.25 105.09 i 110.93 20 116.76 122.60 128.44 134.28 140.12 145.95 151.79 157.63 163.47 169.31 30 175.15 180.93 186.82 192.66 198.50 204.34 210.17 216.01 221.85 227.69 40 233.53 239.37 245.20 251.04 256.88 262.72 268.56 274.39 280.23 286.07 50 291.91 297.75 303.59 309.42 315.26 321.10 326.94 332.78 338.62 344.45 60 350.29 356.13 361.97 367.81 373.64 379.48 385.32 391.16 397.00 402.84 70 403.67 414.51 420.35 426.19 432.03 437.86 443.70 449.54 455.38 461.22 80 467.06 472.89 478.73 484.57 490.41 496.25 502.08 507.92 513.76 519.60 90 525.44 531.28 537.11 542.95 548.79 554.63 560.47 566.30 572.14 577.98 D 141 XXVII. CONVERSION OF KLAFTER OF VIENNA INTO ENGLISH FEET. 1 Klafter = 6.2221403 English Feet. Hundreds. Klafter of Vienna. Thousands. 0. 100. 200. 300. 400. 500. 600. 700. 800. 900. Eng. feet. Eng. feet. Eng. feet. Eng. feet. Eng. feet. Eng. feet. Eng. feet. Eng. feet. Eng. feet. Eng feet. , 0 0.00 622.21 1244.43 1866.64 2488.86 3111.07 3733.28 4355.50 4977.71 5599.93; 1000 6222.14 6844.35 7466.57l8088.78.8711. 00 9333.21 9955.42 10577.6 11199.9 11822.1' 2000 12444.3 13066.5 13688.7 14310.9 14933.1 15555.4 16177.6 16799.8 17422.0 18044.2J 3000 18666.4 19288.6 19910.8 20533.1:21155.3 21777.5 22399.723021.923644.1 24266.3 i 4000 24888.6 25510.8 26133.0 26755.2 27377.4 '27999.6 28621.8;29244.1 29866.330488,5 Units. Klafter. Tens. o. 1. 2. 3. 4. 5. 6. 7. 8. 0. Eng. feet. Eng. feet. Eng. feet. Eng. feet. Eng. feet. Eng. feet. Eng. feet. Erig.feet. Eng. feet. Eng. feet. '. 0 0.00 6.22 12.44 18.67 24.89 31.11 37.33 43.55 49.78 56.00 10 62.22 68.44 74.67 80.89 87.11 93.33 99.55 105.78 112.00 118.22 | 20 124.44 130.66 136.89 143.11 149.33 155.55 161.78 168.00 174.22 180.44 30 186.66 192.89 199.11 205.33 211.55 217.77 224.00 230.22 236.44 242.66 ; 40 248.89 255.11 261.33 267.55 273.77 280.00 286.22 292.44 298.66 304.88 ! 50 311.11 317.33 323.55 329.77 336.00 342.22 348.44 354.66 360.88 367.11 60 373.33 379.55 385.77 391.99 398.22 404.44 410.66 416.88 423.11 429.33 i 70 435.55 441.77 447.99 454.22 460.44 466.66 472.88 479.10 485.33 491.55 80 497.77 503.99 510.22 516.44 522.66 528.88 535.10 541.33 547.55 553.77 90 559.99 566.21 572.44 578.66 584.88 591.10 597.33 603.55 609.77 615.99 i XXVIII. CONVERSION OF FEET OF VIENNA INTO METRES. 1 Foot of Vienna = 0.3160790 Metre. Feet of Hundreds. Thousands. O. 1OO. 2OO. 300. 400. 500. 600. TOO. 8OO. ooo. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. 0 0.00 31.61 63.22 94.82 126.43 158.04 189.65 221.26 252.86 284.47: 1000 316.08 347.69 379.29 410.90 442.51 474.12 505.73 537.33 568.94 600.55 2000 632.16 663.77 695.37 726.98 7-38.59 790.20 821.81 853.41 885.02 916.63 3000 948.24 979.84 1011.45 1043.06 1074.67 1106.28 1137.88 1169.49 1201.101232.71 4000 1264.32 1295.92 1327.53 1359.14 1390.75 1422.36 1453.96 1485.57 1517.18 1548.79 5000 1580.40 1612.00 1643.61 1675.22 1706.83 1738.43 1770.04 1801.65 1833.26 1864.87 6000 1896.47,1928.08 1959.69 1991.30 2022.91 2054.51 2086.12 2117.73 2149.34 2180.95 7000 2212.552244.16 2275.77 2307.38 2338.98 2370.59 2402.20 2433.81 2465.42 2497.02 8000 2528.63 2560.24 2591.85 2623.46 2655.06 2686.67 2718.28 2749.89 2781.50:2813.10 9000 2844.71 2876 32 2907.93 2939.53 2971.14 3002.75 3034.36 3065.97 3097.57 3129.18 10000 3160.79 3192.40 3224.01 3255.61 3287.02 3318.83 3350.44 3382.05 3413.65 3445.26 11000 3176.87 3508.48 3540.083571.69 3603.30 3634.91 3666.52 3698.12 3729.733761.34' 12000 3792.95 3824.56 3856.163887.77 3919.38 3950.99 3982.60 4014.20 4045.81 4077.42 13000 4109.03 4140.64 4172.24 4203.85 4235.46 4267.07 4298.67 4330.28 4361.894393.50 14000 4425.11 4456.71 4488.32 4519.93 4551.54 4583.154614.75 4646.34 4677.97 4709.58 15000 4741.19 4772.79 4804.40 4836.01 4867.62 4899.22 4930.83 4962.44 4994.05 5025.66 D 142 XXIX. CONVERSION OF FEET OF VIENNA INTO PARIS OR FRENCH FEET AND DECIMALS. 1 Foot of Vienna = 0.9730317 Paris Foot. Feet of Vienna. Thousands. Hundreds. 0. 100. 200. 30O. 400. 500. 600. 700. soo. 900. Par. feet. Par. feet. Par. feet. Par. feet. Par. feet. Par. feet. Par. feet. Par. feet. Par. feet. Par. feet. 0 1000 0.0 973.0 97.30 1070.3 19,46 1167.6 29.19 1264.9 38.92 1362.2 48.65 1459.5 58.38 1556.9 68.11 1654.2 77.84 1251.5 87.57 1848.8 2000 1946.1 2043.4 2140.7 3238.0 2335.3 2432.6 2530.0 2627.2 2724 5 2821.8 3000 2919.1 3016. 4 3113.7 3211.0 3308.3 3405.6 3502.9 3600.2 3697.5 3794.8 4000 3892.1 3989.4 4086.7 4184.0 4281.3 4378.6 4475.9 4573.2 4670.6 4767.9 5000 4865.2 4962.5 5059.8 5157.1 5254.4 5351.7 5449.0 5546.3 5643.6 5740.9 6000 5838.2 5935.5 6032.8 6130.1 6227.4 6324.7 6422.0 6519.3 6616.6 6713.9 7000 6811.2 6908.5 7005.8 7103.1 7200.4 7297.7 7395.0 7492.3 7589.6 7687.0 8000 7784.3 7881.6 7978.9 8076.2 8173.5 8270.8 8368.1 8465.4 8562.7 8660.0 9000 8757.3 8854.6 8951.9 9049.2 9146.5 9243.8 9341.1 9438.4 9535.7 9633.0 10000 9730.3 9827.6 9924.9 10022.2 10119.5 10216.8 10314.1 10411.4 10508.7 10606.0 11000 10703.3 10S00.7 10898.0 10995.3 11092.6 11189.9 11287.2 11384.5 11481.8 11579.1 12000 11676.4 11773.7 11871.0 11968.3 12065.6 12162.9 12260.2 12357.5 12454.8 12552.1 13000 14000 12649.4 13622.4 12746.7 13719.7 12844.0 13817.1 12941.3 13914.3 13038 6 14011.7 13135.9 14109.0 13233.2 14206.3 13330.5 14303.6 13427.8 14400.9 13525.1 14498.2 15000 14595.5 14692.8 14790.1 14887.4 14984.7 15082.0 15179.3 15276.6 15373.9 15471.2 16000 15568.5 15665.8 15763.1 15860.4 15957.7 16055.0 16152.3 16249.6 16346.9 16444.2 XXX. CONVERSION OF FEET OF VIENNA INTO ENGLISH FEET AND DECIMALS. 1 Foot of Vienna = 1.0370234 English Foot. Feet of Vienna. Thousands. Hundreds. 0. too. 2OO. 300. 400. 500. 600. 700. §00. 900. 0 Eng.feet. 0.0 Eng.feet. 103.7 Eng. feet. 207.4 Eng.feet. 311.1 Eng. feet. 414.8 Eng. feet. 518.5 Eng. feet. 622.2 Eng. feet. 725.9 Eng. feet. 829.6 Eng. feet 933.3 1000 1037.0 1140.7 1244.4 1348.1 1451.8 1555.5 1659.2 1762.9 1866.6 1970.3 2000 2074.0 2177.7 2281.5 2385.2 2488.9 2592.6 2696.3 2800.0 2903.7 3007.4 3000 3111.1 3214.8 3318.5 3422.2 3525.9 3629.6 3733.3 3837.0 3940.7 4044.4 4000 4148.1 4251.8 4355.5 4459.2 4562.9 4666.6 4770.3 4874.0 4977.7 5081.4 5000 5185.1 5288.8 5292.5 5496.2 5599.9 5703.6 5807.3 5911.0 6014.7 6118.4 6000 6222.1 6325.8 6429.5 6533.2 6636.9 6740.7 6844.4 6948.1 7051.8 7155.5 7000 8000 7259.2 8296.2 7362.9 8399.9 7466.6 8503.6 7570.3 8607.3 7674.0 8711.0 7777.7 8814.7 7881.4 8918.4 7985.1 9022.1 8088.8 9125.8 8192.5 9229.5 9000 9333.2 9436.9 9540.6 9644.3 9748.0 9851.7 9955.4 10059.1 10162.8 10266.5 10000 10370.2 10473.9 10577.6 10681.3 10785.0 10888.7 10992.4 11096.2 11199.9 11303.6 11000 12000 13000 14000 15000 11407.3 12444.3 13481.3 14518.3 15555.4 11511.0 12548.0 13585.0 14622.0 15659.1 11614.7 12651.7 13688.7 14725.7 15762.8 11718.4 12755.4 13792.4 14829.4 15866.5 11822.1 12859.1 13896.1 14933.1 15970.2 11925.8 12962.8 13999.8 15036.8 16073.9 12029.5 13066.5 14103.5 15140.5 16177.6 12133.2 13170.2 14207.2 15244.2 162S1.3 12236.9 13273.9 14310.9 15347.9 16385.0 12340.6 13377.6 14414.6 15451.6 16488.7 16000 16592.4 16696.1 1679&.8 16903.5 17007.2 17110.9 17214.6 17318.3 17422.0 17525.7 D 143 TO CONVERT RHINE OR PRUSSIAN FEET INTO DIFFERENT MEASURES OF LENGTH. The Rhine Foot is used in Physical Geography, though not so extensively as the French or £aris Foot, in the northwestern part of Germany, Denmark, and Holland. Its legal value in the Prussian system of weights and measures is 139.13 French or Paris Lines, from which are derived the equations used in computing the follow- ing tables. XXXI. CONVERSION OF RHINE OR PRUSSIAN FEET INTO FRENCH TOISES. 1 Rhine Foot = 0.1610301 Toise. Hundreds. Rhine Feet Thousands o. 100. 20O. 300. 400. 500. 600. 700. §00. 900. 0 Toises. 0.00 Toises. 16.10 Toises. 32.21 Toises. 48.31 Toises. 64.41 Toises 80.52 Toises. 96.62 Toises. 112.72 Toises. 128.82 Toises. 144.93 1000 161.03 177.13 193.24 209.34 225.44 241.55 257.65 273.75 289.85 305.96 2000 322.06 338.16 354.27 370.37 386.47 402.58 418.68 434.78 450.88 466.99 3000 483.09 499.19 515.30 531.40 547.50 563.61 579.71 595.81 611.91 628.02 4000 634.12 650.22 666.33 692.43 608.53 724.64 740.74 756.84 772.94 789.05 5000 805.15 821.25 837.36 853.46 869.56 885.67 901.77 917.87 933.97 950.08 6000 966.18 982.28 998.39 1014.49 1030.59 1046.70 1062.80 1078.90 1095.00 1111.11 7000 1127.21 1143.31 1159.42 1175.52 1191.62 1207.73 1223.83 1239.93 1256.03 1272.14 8000 1288.24 1304.34 1320.45 1336.55 1352.65 1368.76 1384.86 1400.96 1417.06 1433.17 9000 1449.27 1465.37 1481.48 1497.58 1513.68 1529.79 1545.89 1561.99 1578.09 1594.20 D 144 XXXII. CONVERSION OF RHINE OR PRUSSIAN FEET INTO METRES. 1 Rhine Foot == 0.31385350 Metre. Rhine Feet. Thousands. Rhine Feet Hundreds. 0. too. 200. 300. 100. 500. 600. 700. §OO. 900. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. 0 0.00 31.39 62.77 94.16 125.54 156.93 188.31 219.70 251.08 282.47 1000 313.85 345.24 376.62 408.01 439.39 470.78 502.17 533.55 564.94 596.32 2000 627.71 659.09 690.48 721.86 753.25 784.63 816.02 847.40 878.79 910.18 3000 941 ;56 972.95 1004.33 1035.72 1067.10 1098.49 1129.87 1161.26 1192.64 1224.03 4000 1255.41 1286.80 1318.18 1349.57 1380.96 1412.34 1443.73 1475.11 1506.50 1537.88 5000 1569.27 1600.65 1632.04 1663.42 1694.81 1726.19 1757.58 1788.97 1820.35 1851.74 6000 1883.12 1914.51 1945.89 1977.28 2008.66 2040.05 2071.43 2102.82 2134.20 2165.59 7000 2196.97 2228.36 2259.75 2291.13 2322.52 2353.90 2385.29 2416.67 2448.06 2479.44 8000 2510.83 2542.21 2573.60 2604.98 2636.37 2667.76 2699.14 2730.53 2761.91 2793.30 9000 2824.68 2856.07 2887.45 2918.84 2950.22 2981.61 3012.99 3044.38 3075.76 3107.15 XXXIII. OF RHINE OR PRUSSIAN FEET INTO FRENCH FEET AND DECIMALS. 1 Rhine Foot = 0 96618056 French Foot. Rhine Feet. Thousands. Rhine Feet. Hundreds. 0. 100. 200. 300. 400. 500. 60O. •700. 800. 90O. Fr.Feet Fr Feet. FrFeet Fr.Feet. FrFeet Fr Feet. Fr.Feet. Fr.Feet. Fr Feet. Fr.Feet. 0 0.00 96.62 193.24 289.85 386.47 483.09 579.71 676.33 772.94 869.56 1000 966.18 1062.80 1159.42 1256.03 1352.65 1449.27 1545.89 1642.51 1739.13 1835.74 2000 1932.36 2028.98 2125.60 2222.22 2318.83 2415.45 2512.07 2608.69 2705.31 2801.92 3000 2898.54 2995.16 3091.78 3188.40 3285.01 3381.63 3478.25 3574.87 3671.49 3768.10 4000 3864.72 3961.34 4057.96 4154.58 4251.19 4347.81 4444.43 4541.05 4637.67 4734.28 5000 4830.90 4927.52 5024.14 5120.76 5217.38 5313.99 5410.61 5507.23 5603.85 5700.47 6000 5797.08 5893.70 5990.32 6086.94 6183.56 6280.17 6376.79 6473.41 6570.03 6666.65 7000 6763.26 6859.88 6956.50 7053.12 7149.74 7246.35 7342.97 7439.59 7536.21 7632.83 8000 7729.44 7826.06 7922.68 8019.30 8115.92 8212.53 8309.15 8405.77 8502.39 8599.01 9000 8695.63 8792.24 8888.86 8985.48 9082.10 9178.72 9275.33 9371.95 9468.57 9565.19 XXXIV. OF RHINE OR PRUSSIAN FEET INTO ENGLISH FEET AND DECIMALS. 1 Rhine Foot = 1 0297217 English Foot. Rhine Feet. Thousands Rhine Feet. Hundreds. 0. 1OO. 200. 3OO. 100. 5OO. 600. 700. 800. 900. 0 Eng feet. 0.00 Eng. feet. 102.97 Eng. feet. 205.94 Eng feet. 308.92 Eng. feet. 411.89 Eng feet. 514.86 Eng. feet. 617.83 Eng. feet. 720.81 Eng. feet. 823.78 Eng. feet. 926.75 1000 1029.72 1132.69 1235.67 1338.64 1441.61 1544.58 1647.55 1750.53 1853.50 1956.47 2000 2059.44 2162.42 2265.39 2368.36 2471.33 2574.30 2677.28 2780.25 2883.22 2986.19 3000 3089.17 3192.14 3295.11 3398.08 3501.05 3604.03 3707.00 3809.97 3912.94 4015.92 4000 4118.89 4221.86 4324.83 4427.80 4530.78 4633.75 4736.72 4839.69 4942.66 5045.64 5000 5148.61 5251.58 5354.55 5457.53 5560.50 5663.47 5766.44 5869.41 5972.39 6075.36 6000 6178.33 6281.30 6384.28 6487.25 6590.22 6693.19 6796.16 6899.14 7002.11 7105.08 7000 7208.05 7311.02 7414.00 7516.97 7619.94 7722.91 7825.89 7928.86 8031.83 8134.80 8000 8237.77 8340.75 8443.72 8546.69 8649.66 8752.64 8855.61 8958.58 9061.55 9164.52 9000 9267.50 9370.47 9473.44 9576.41 9679.38 9782.36 9885.33 9988.30 10091.3 10194.2 D 145 TO CONVERT SPANISH OR MEXICAN VARAS AND FEET INTO DIFFERENT MEASURES OF LENGTH. XXXV. CONVERSION OF SPANISH OR MEXICAN VARAS INTO METRES. 1 Vara = 0 847965 Metre. Hundreds. Varaa. Thousands. 0. 100. 20O. 300. 400. 500. 600. 7OO. 8OO. 900. Metres. Metres. Metres Metres. Metres. Metres. Metres. Metres. Metres. Metres. 0 0.00 84.80 169.59 254.39 339.19 423.98 508.78 593.58 678.37 763.17 1000 847.96 932.76 1017.56 1102.35 1187.15 1271.95 1356.74 1441.54 1526.34 1611.13 2000 1695.93 1780.73 1865.52 1950.32 2035.12 2119.91 2204.71 2289.51 2374.30 2459.10 3000 2543.89 2628.69 2713.49 2798.28 2883.08 2967.88 3052.67 3137.47 3222.27 3307.06 4000 3391.86 3476.66 3561.45 3646.25 3731.05 3815.84 3900.64 3985.44 4070.23 4155.03 5000 4239.82 4324.62 4409.42 4494.21 4579.01 4663.81 4748.60 4833.40 4918.20 5002.99 6000 5087.79 5172.59 5257.38 5342.18 5426.98 5511.77 5596.57 5681.37 5766.16 5850.96 7000 5935.75 6020.55 6105.35 6190.14 6274.94 6359.74 6444.53 6529.33 6614.13 6698.92 8000 6783.72 6868.52 6953.31 7038.11 7122.91 7207.70 7292.50 7377.30 7462.09 7546.89 9000 7631.68 7716.48 7801.28 7886.07 7970.87 8055.67'8140.46 8225.26 8310.06 8394.85 XXXVI. OF SPANISH OR MEXICAN VARAS INTO ENGLISH FEET AND DECIMALS. 1 Vara = 2.78209 English Feet. Hundreds. Varas. Thousands 0. 1OO. 200. 300. 400. 500. 600. 700. 8OO. 900. Eng.fect. Eng. feet. Eng. feet. Eng. feet. Eng. feet. Eng. feet. Eng. feet. Eng. feet. Eng. feet. Eng. feet. 0 0.0 278.2 556.4 834.6 1112.8 1391.0 1669.3 1947.5 2225.7 2503.9 1000 2782.1 3060.3 3338.5 3616.7 3894.9 4173.1 4451.3 4729.6 5007.8 5286.0 2000 5564.2 5842.4 6120.6 6398.8 6677.0 6955.2 7233.4 7511.6 7789.9 8068.1 3000 8346.3 8624.5 8902.7 9180.9 9459.1 9737.3 10015.5 10293.7 10571.9 10850.2 4000 11128.4 11406.6 11684.8 11963.0 12241.2 12519.4 12797.6 13075.8 13354.0 13632.2 5000 13910.4 14188.7 14466.9 14745.1 15023.3 15301.5 15579.7 15857.9 16136.1 16414.3 6000 16692.5 16970.7 17249.0 17527.2 17805.4 18083.6 18361.8 18640.0 18918.2 19196.4 7000 19474.6 19752.8 20031.0 20309.3 20587.5 20865.7 21143.9 21422.1 21700.3 21978.5 8000 22256.7 22534.9 22813.1 23091.3 23369-6 23647.8 23926.0 24204.2 24482.4 24760.6 9000 25038.8 25317.0 25595.2 25873.4 26151.6 26429.9 26708.1 26986.3 27164.5 27442.7 I) 146 XXXVII. CONVERSION OF CASTILIAN FEET INTO METRES. 1 Castilian Foot = 0.282656 Metre. Castilian Feet. Thousands. Hundreds. O, 100. 2OO. 3OO. 400. 5OO. 600. 700. §OO. 900. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. Metres. o 0.00 28.27 56.53 84.80 113.06 141.33 169.59 197.86 226.12 254.39 1000 282.65 310.92 339.19 367.45 395.72 423.98 452.25 480.51 508.78 537.04 2000 565.31 593.58 621.84 650.11 678.37 706.64 734.90 763.17 791.43 819.70 3000 847.96 876.23 904.50 932.76 961.03 989.29 1017.56 1045.82 1074.09 1102.35 4000 1130.62 1158.89 1187.15 1215.42 1243.68 1271.95 1300.21 1328.48 1356.74 1385.01 5000 1413.27 1441.54 1469.81 1498.07 1526.34 1554.60 1582.87 1611.13 1639.40 1667.66 6000 1695.93 1724.20 1752.46 1780.73 1808.99 1837.26 1865.52 1893.79 1922.05 1950.32 7000 1978.58 2006.85 2035.12 2063.38 2091.65 2119.91 2148.18 2176.44 2204.71 2232.97 8000 2261.24 2289.51 2317.77 2346.04 2374.30 2402.57 2430.83 2459.10 2487.36 2515.63 9000 2543.89 2572.16 2600.43 2628.69 2656.96 2685.22 2713.49 2741.75 2770.02 2798.28 XXXVIII. CONVERSION OF CASTILIAN FEET INTO PARIS OR FRENCH FEET. 1 Castilian Foot = 0 870138 Paris Foot. Castilian Feet. Thousands. Hundreds. O. 100. 200. 300. 4OO. 5OO. 600. •700. 800. 900. Par. Feet. Par. Feet. Par. Feet. Par. Feet. Par Feet. Par. Feet. Par. Feet. Par Feet. Par.Feet. Par.Feet. o 0.00 87.01 174.03 261.04 348.06 435.07 522.08 609.10 696.11 783.12 1000 870.14 957.15 1044.17 1131.18 1218.19 1305.21 1392.22 1479.23 1566.25 1653.26 2000 1740.28 1827.29 1914.30 2001.32 2088.33 2175.35 2262.36 2349.37 2436.39 2523.40 3000 2610.41 2697.43 2784.44 2871.46 2958.47 3045.48 3132.50 3219.51 3306.52 3393.54 4000 3480.55 3567.57 3654.58 3741.59 3828.61 3915.62 4002.64 4089.65 4176.66 4263.68 5000 4350.69 4437.70 4524.72 4611.73 4698.75 4785.76 4872.77 4959.79 5046.80 5133.82 6000 5220.83 5307.84 5394.86 5481.87 5568.88 5655.90 5742.91 5829.93 5916.94 6003.95 7000 6090.97 6177.98 6265.00 6352.01 6439.02 6526.04 6613.05 6700.06 6787.08 6874.09 8000 6961.11 7048.12 7135.13 7222.15 7309.16 7396.17 7483.19 7570.20 7657.22 7744.23 9000 7831.24 7918.26 8005.27 8092.29 8179.30 8266.31 8353.83 8440.34 8527.35 8614.37 XXXIX. CONVERSION OF CASTILIAN FEET INTO AMERICAN FEET. 1 Castilian Foot = 0.927309 American Foot. Castilian Feet. i Thousands. Hundreds. 0. 1OO. 200. 300. 400. 500. 6OO. 7OO. soo. 900. Am. Feet Am Feet. Am. Feet. Am. Feet. Am. Feet. Am. Feet. Am. Feet. Am Feet Am. Feet Am. Feet 0 0.00 92.73 185.46 278.19 370.92 463.65 556.39 649.12 741.85 834.58 1000 927.31 1020.04 1112.77 1205.50 1298.28 1390.96 1483.69 1576.43 1669.16 1761.89 2000 1854.62 1947.35 2040.08 2132.81 2225.54 2318.27 2411.00 2503.74 2596.47 2689.20 3000 2781.93 2874.66 2967.39 3060.12 3152.85 3245.58 3338.31 3431.04 3523.78 3616.51 4000 3709.24 3801.97 3894.70 3987.43 4080.16 4172.89 4265.62 4358.35 4451.08 4543.82 5000 4636.55 4729.28 4822.01 4914.74 5007.47 5100.20 5192.93 5285.66 5378.39 5471.12 6000 5563.86 5656.59 5749.32 5842.05 5934.78 6027.51 6120.24 6212.97 6305.70 6398.43 7000 6491.17 6583.90 6676.63 6769.36 6862.09 6954.82 7047.55 7140.28 7233.01 7325.74 8000 7418.47 7511.21 7603.94 7696.67 7789.40 7882.13 7974.86 8067.59 8160.32 8253.05 9000 8345.78 8438.51 8531.25 8623.98 8716.71 8809.44 8902.17 8994.90 9087.63 9180.36 D 147 THE length of the Spanish Vara, and of the Spanish or Castilian foot, used in the late Spanish Colonies of Mexico and South America, owing, no doubt, to the imper- fection of the local standards, shows considerable variations from the value on which the preceding tables are based. A careful comparison of the standard Vara, brought from Mexico by Major Turn- bull, and deposited in the United States Office of Weights and Measures, (see above p. 113,) gave for its length 32.9682 American inches = 2.7473333 American feet — 2.7474928 English feet = 0.8374206 metre. From a series of altitudes published in Mexico, by Cortina, in Castilian feet, and by Orbegozo in metres and Castilian feet, Jul. Schmidt derives the following value of the Vara and of the Castilian foot, used by these authors (see Petermann's Mittheil. 1857, p. 371) : One Vara = 2.573296 Paris feet = 0.8358065 metre ; and one Castilian foot = 0.857764 Paris foot = 0.91417 English foot. According to Colonel J. Ondarza, one of the authors of the new official Map of Bolivia, the Bolivian government has declared the legal value of the Spanish Vara to be in the ratio of 100 metres =118 Varas = 354 Spanish feet, which value has been adopted by him in publishing his measured altitudes. XXXVIIl' MEXICO. CONVERSION OF CASTILIAN FEET INTO METRES, PARIS AND ENGLISH FEET. Mexican According to TurnbulTs Standard. According to Schmidt, from Cortina. or Castilian Feet. Metres. Paris Feet. English Feet. Metres. Paris Feet. English Feet. 1000 279.14 859.30 915.83 278.64 857.76 914.17 2000 558.28 1718.60 1831.66 557.27 1715.53 1828.34 3000 837.42 2577.39 2747.49 835.91 2573.29 2742.51 4000 1116.56 3437.19 3663.32 1114.54 3431.06 3656.68 5000 1395.70 4296.49 4579.15 1393.18 4288.82 4570.85 6000 1674.84 5155.79 5494.99 1671.81 5146.58 5485.02 7000 1953.93 6015.08 6410.82 1950.45 6004.35 6399.19 8000 2233.12 6874.38 7326.65 2229.08 6862.11 7313.36 9000 2512.26 7733.68 8242.48 2507.72 7719.88 8227.53 XXXIX'. BOLIVIA. CONVERSION OF SPANISH VARA AND SPANISH FEET. 1 Spanish foot = 0 2824859 metre = 0.8696171 Paris foot, = 0.9268078 English foot Bolivian or Spanish Feet. Metres. Paris Feet. English Feet. Metres. Spanish Varas. Spanish Feet. 1000 282.49 869.62 926.81 1000 1180 3540 2000 564.97 1739.23 1853.61 2000 2360 7080 3000 847.46 2608.85 2780.42 3000 3540 10620 4000 1129.94 3478.47 3707.23 4000 4720 14160 5000 1412.43 4348.09 4634.04 5000 5900 17700 6000 1694.92 5217.70 5560.85 6000 7080 21240 7000 1977.40 6087.32 6487.65 7000 8260 24780 8000 2239.89 6956.94 7414.46 8000 9440 28320 9000 2542.37 7826.55 8341.27 9000 10620 31860 D 148 TO CONVERT FRACTIONAL PARTS OF A TOISE AND OF A FOOT INTO EACH OTHEK. XL. CONVERSION OF INCHES INTO DUODECIMAL LINES. 1 Inch = 12 Lines. iches. Inches. Units. 'ens. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0 Lines. 0 Lines. 12 Lines. 24 Lines. 36 Lines. 48 Lines. 60 Lines. 72 Lines. 84 Lines. 96 Lines. 108 1 10 120 132 144 156 168 180 192 204 216 228 20 240 252 264 276 288 300 312 324 336 348 30 3CO 372 384 396 408 420 432 444 456 468 40 480 492 504 516 528 540 552 564 576 5SS 50 600 612 624 636 648 660 672 684 696 708 60 720 732 744 756 768 780 792 804 816 828 70 840 852 864 876 888 900 912 924 936 948 80 960 972 984 996 1008 1020 1032 1044 1056 1068 90 1080 1092 1104 1116 1128 1140 1152 1164 1176 1188 iOO 1200 1212 1224 1236 1248 1260 1272 1284 1296 1308 XLI. CONVERSION OF DECIMALS OF A TOISE INTO FEET AND INCHES. 1 Toise = 6 Feet = 72 Inches = 864 Lines. s. 1 Hundredths of a Toise. 0. 1. 2. 3. 4. 5. I 6. 7. 8. 9. ft in lin ft. in. lin. ft. in. lin ft. in. lin. ft. in lin. ft. in. lin. ft. in. lin. ft. in. lin. ft. in. lin. ft. in. lin 0.0.0,00 0. 0. 8,64 0. 1. 5,28 0. 2. 1,92 0. 2.10,56 0. 3.7,20 0. 4. 3,84 0.5. 0,48 0. 5. 9,12 0. 6. 5,76 0.7.2,40 0. 7.11,04 0. 8. 7,68 0. 9. 4,32 0.10. 0,96 0.10.9,60 0.11. 6,24 1.0. 2,88 1. 0.11,52 1. 1. 8,16 1.2.4,80 1. 3. 1,44 1. 3.10,08 1. 4. 6,72 1. 5. 3,36 1. 6.0,00 1. 6. 8,64 1.7. 5,28 1. 8. 1,92 1. 8.10,56 1.9.7,20 1.10. 3,84 1.11. 0,48 1.11. 9,12 2. 0. 5,76 2. 1.2,40 2. 1.11,04 2.2. 7,68 2. 3. 4,32 2. 4. 0,96 2.4.9,60 2. 5. 6,24 2. 6. 2,88 2. 6.11,52 2. 7. 8,16 2. 8.4,80 2. 9. 1,44 2.9.10,08 2.10. 6,72 2.11. 3,36 3.0.0,00 3. 0. 8,64 3. 1. 5,28 3. 2. 1,92 3. 2.10,56 3. 3.7,20 3. 4. 3,84 3.5. 0,48 3. 5. 9,12 3. 6. 5,76 3.7.2,403. 7.11,04 3. 8. 7,68 3. 9. 4,32 3.10. 0,96 3.10.9,60 3.11. 6,24J4.0. 2,88 4. 0.11,52 4. 1. 8,16 4.2*4,804. 3. 1,44 4. 3.10,08 4. 4. 6,72 4. 5. 3,36 4. 6.0,00 4. 6. 8,64 4.7. 5,28 4. 8. 1,92 4. 8.10,56 4.9.7,20 4.10. 8,84 4.11. 0,48 4.11. 9,12 5. 0. 5,76 5. 1.2,40 5. 1.11,04;5.2. 7,68 5. 3. 4,32 5. 4. 0,96 . 5.4.9,60 5. 5. 6,24 5. 6. 2,88 5. 6.11,52 5. 7. 8,16 5. 8.4,80 5. 9. 1,44'5.9.10,08 5.10. 6,72 5.11. 3,36 149 XLII. CONVERSION OF DECIMALS OF A FOOT INTO INCHES AND DECIMALS. Hundredths of a Foot. Feet. Tens. o. 1. 2. 3. 4. 5. 6. 7. 8. 9. Inches. Inches. Inches. Inches. Inches Inches. Inches. Inches. Inches. Inches. 0.0 0.00 0.12 0.24 0.36 0.48 0.60 0.72 0.84 0.96 1.08 0.1 1 .20 1.32 1.44 1.56 1.68 1.80 1 .92 2.04 2.16 2.28 0.2 2.40 2.52 2.64 2.76 2.88 3.00 3 .12 3.24 3.36 3.48 0.3 3.60 3.72 3.84 3.96 4.08 4.20 4 .32 4.44 4.56 4.68 0.4 4.80 4.92 5.04 5.16 5.28 5.40 5 .52 5.64 5.76 5.88 0.5 6.00 6.12 6.24 6.36 6.48 6.60 6 .72 6.84 6.96 7.08 0.6 7.20 7.32 7.44 7.56 7.68 7.80 7.92 8.04 8.16 8.28 0.7 8 .40 8.52 8.64 8.76 8.88 9.00 9 .12 9.24 9.36 9.48 0.8 9 .60 9.72 9.84 9.96 10.08 10.20 10.32 10.44 10.56 10.68 0.9 10.80 10.92 11.04 11.16 11.28 11.40 11 .52 11.64 11.76 11.88 XLIII . CONVERSION OF DECIMALS OF A FOOT INTO INCHES AND DUODECIMAL LINES. Hundredths of a Foot. Feet. Tens. o. 1. 2. 3. 4. 5. 6. 7. 8. V. In. Line. In. Line. I a. Line. In. Line. In. Line. In. Line 'n. Line In. Line. [n. Line [n. Line. 0.0 0.0,00 0. 1,44 0. 2,88 0. 4,32 0. 5,76 0.7,20 0. 8,64 0.10,08 0.11,52 1. 0,96 0.1 1.2,40 1. 3,84 1. 5,28 1. 6,72 1. 8,16 1.9,60 1.11,04 2. 0,48 2 . 1,92 2. 3,36 0.2 2.4,80 2. 6,24 2. 7,68 2. 9,12 2.10,56 3.0,00 3. 1,44 3. 2,88 3 . 4,32 3. 5,76 ' 0.3 3.7,20 3. 8,64 3.10,08 3.11,52 4. 0,96 4.2,40 4. 3,84 4. 5,28 4 . 6,72 4. 8,16 0.4 49,60 4.11,04 5. 0,48 5. 1,92 5. 3,36 5.4,80 5. 6,24 5. 7,68 5 . 9,12 5.10,56 0.5 6.0,00 6. 1,44 5. 2,88 6. 4,32 6. 5,76 6.7,20 6. 8,64 6.10,08 6 .11,52 7. 0,96 0.6 7.2,40 7. 3,84 7. 5,28 7. 6,72 7. 8,16 7.9,60 7.11,04 8. 0,48 8. 1,92 8. 3^36 0.7 8.4,80 8. 6,24 B. 7,68 8. 9,12 8.10,56 9.0,00 9. 1 ,44 9. 2,88 9. 4,32 9. 5,76 0.8 9.7,20 9. 8,64 9.10,08 9.11,52 10. 0,96 10.2,40 LO. 3,8410. 5,2810 . 6,72 10. 8,16 0.9 10.9,60 10.11,04 1 1. 0,48 11. 1,92 11. 3,36 11.4,8011. 6,2411. 7,68lll . 9,12 11.10,56 XLIV. CONVERSION OF INCHES AND DUODECIMAL LINES INTO DECIMALS OF A FOOT. 1 Inch = 0 08333 of a Foot. 1 Line = 0.006944 of a Foot. Lines. Inches. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. Foot. Foot. Foot. Foot. Foot. Foot. Foot. Foot. Foot. Foot. Foot. Foot. 0 0.0000 0.006! ) 0.013! ) 0.0208 0.0278 0.0347 0.0417 0.0486 0.0556 0.0625 0.0694 0.0764 1 0.0833 0.090; J 0.097! I 0.1042 0.1111 0.1181 0.1250 0.1319 0.1389 0.1458 0.1528 0.1597 2 0.1667 0.173< 5 0.180( > 0.1875 0.1944 0.2014 0.2083 0.2153 0.2222 0.2292 0.2361 0.24311 3 0.2500 0.256! ) 0.263! ) 0.2708 0.2778 0.2847 0.2917 0.2986 0.3056 0.3125 0.3194 0.3264 4 0.3333 0.340. J 0.3475 I 0.3542 0.3611 0.3681 0.3750 0.3819 0.3889 0.3958 0.4028 0.4097 5 0.4167 0.423 5 0.4301 3 0.4375 0.4444 0.4514 0.4583 0.4653 0.4722 0.4792 0.4861 0.4931 6 0.5000 0.506! ) 0.513' ) 0.5208 0.5278 0.5347 0.5417 0.5486 0.5556 0.5625 0.5694 0.5764 7 0.5833 0.5901 J 0.5975 I 0.6042 0.6111 0.6181 0.6250 0.6319 0.6389 0.6458 0.6528 0.6597 8 0.6667 0.6731 5 0.680 3 0.6875 0.6944 0.7014 0.7083 0.7153 0.7222 0.7292 0.7361 0.7431 9 0.7500 0.756< ) 0.763! ) 0.7708 0.7778 0.7847 0.7917 0.7986 0.8056 0.8125 0.8194 0.8264 10 0.8333 0.840J J 0.847! I 0.8542 0.8611 0.8681 0.8750 0.8819 0.8889 0.8958 0.9028 0.9097 11 0.9167 0.9236 0.9301 3 0.9375 0.9444 0.9514 0.9583 0.9653 0.9722 0.9792 0.9861 0.9931 1 D 150 METEOROLOGICAL TABLES. v. METEOROLOGICAL CORRECTIONS, OR TABLES FOR CORRECTING SERIES OF OBSERVATIONS FOR THE PERIODIC AND NON-PERIODIC VARIATIONS. E • CONTENTS. [The figures refer to the folio at the bottom of the page. — The letters near them mean, D. = calculated by Dove ; 01. = Glaisher ; G. = Guyot ; L. = Lefroy. For the letters before the latitudes, see page 12.] Temperature. Hourly Corrections for Periodic Variations. TABLE I. " II. " III. " IV. " V. " VI. « VII. " VIII. " IX. « X. " XL " XII. " XIII. « XIV. " XV. u y/ " XVI. « XVII. E NORTH AMERICA. Station. Washington, District Columbia, Philadelphia, Girard College, Philadelphia, Girard College, Frankfort Arsenal, Penn., Frankfort Arsenal, Penn., Toronto, Canada West, Toronto, Canada West, Toronto, Canada West, Toronto, Canada West, Montreal, Canada East, Sitka, Russian America, Boothia Felix, Arctic America, Lake Athabasca, Arctic America, Melville Island, Arctic America, Hecla Cove, Spitzbergen, Appendix. Amherst College, Mass., Latitude. Scale. Page. B i. 38 54 N. Reau. D. 15 A'3. 39 58 N. Reau. D. 15 A'3. 39 58 N. Fahr. G. 16- C. 39 57 N. Reau. D. IT C. 39 57 N. Fahr. D. 18 B. 43 40 N. Fahr. D. 19 B. 43 40 N. Reau. D. 20 A'6. 43 40 N. Fahr. L. 21 A'6. 43 40 N. Reau. D. 22 A'l. 45 30 N. Fahr. G. 22 A'5. 57 3N. Reau. D. 23 A. 69 59 N. Reau. D. 24 C. 59 N. Fahr. L. 25 C. 74 47 N. Reau. D. 25 C. 79 55 N. Reau, D. 25 A'l. 42 22 N. Fahr, D. 28 SOUTH AMERICA. Rio Janeiro, Brazil, Rio Janeiro, Brazil, C. C. 22 54 S. 22 54 S. Fahr. Reau. D. D. 26 27 CONTENTS. ASIA. Station. TABLE XVIII. Trevandrum, India, n XIX. Trevandrum, India, t XX. Madras, India, M XXI. Madras, India^ 1C XXII. Bombay, India, u XXIII. Bombay, India, u XXIV. Madras, India, It XXV. Bombay, India, u XXVI. Calcutta, India, u XXVII. Tiflis, Georgia, u XXVIII. Peking, China, It XXIX. Nertchinsk, Siberia, u XXX. Nertchinsk, Siberia, It XXXI. Barnaul, Siberia, Ik XXXII. Barnaul, Siberia, 11 XXXIII. Barnaul, Siberia, EUROPE. u XXXIV. Rome, Italy, u XXXV. Padua, Italy, u XXXVI. Geneva, Switzerland, u XXXVII. Geneva, Switzerland, u XXXVIII. St. Bernard, Switzerland, u XXXIX. St. Bernard, Switzerland, u XL. Kremsmiinster, Austria, u XLI. Salzburg, Austria, (C XLII. Munich, Bavaria, u XLIII. Prague, Bohemia, u XLIV. Prague, Bohemia, u XLV. Plymouth, England, u XL VI. Plymouth, England, u XL VII. Brussels, Belgium, u XLVIII. Brussels, Belgium, it XLIX. Schwerin, Germany, u L. Miihlhausen, Prussia, tc LI. Utrecht, Holland, u LII. Greenwich, England, u LIII. Greenwich, England, u LIV. Greenwich, England, u LV. Halle, Prussia, u •m LVI. Gottingen, Hanover, Latitude. Scale. Page. o i A. 8 31 N. Fahr. D. 31 A. 8 31 N. Reau. D. 32 A. 13 4 N. Fahr. D. 33 A. 13 4 N. Reau. D. 34 A. 18 56 N. Fahr. D. 35 A. 18 56 N. Reau. D. 36 A'5. 13 4 N. Reau. D. 37 A'4. 18 56 N. Reau. D. 37 A'2. 22 33 N. Reau. D. 38 A'4. 41 41 N. Reau. D. 39 A'4. 39 54 N. Reau. D. 39 A'6. 51 18 N. Reau. D. 40 A. 51 18 N. Reau. D. 41 A. 53 20 N. Fahr. D. 42 A. 53 20 N. Reau. D. 43 A'6. 53 20 N. Reau. D. 44 C. 41 54 N. Reau. D. 47 C. 45 24 N. Reau. D. 48 Cio. 46 12 N. Reau. D. 49 C'4. 46 12 N. Reau. D. 49 Cio. 45 52 N. Reau. D. 50 C'4. 45 52 N. Reau. D. 50 C. 48 3 N. Reau. D. 51 A'6. 47 48 N. Reau. D. 52 A'6. 48 9 N. Reau. D. 52 A'IO. 50 5 N. Reau. D. 53 A. 50 5 N. Reau. D. 54 C. 50 22 N. Fahr. D. 55 C. 50 22 N. Reau. D. 56 B. 50 51 N. Reau. D. 57 B'. 50 51 N. Reau. D. 58 B'3. 53 36 N. Reau. D. 58 C. 51 13 N. Reau. D. 59 A'2. 52 5 N. Reau. D. 60 B'7. 51 29 N. Reau. D. 60 B. 51 29 N. Reau. D. 61 B. 51 29 N. Fahr. Gl. 62 C. 51 30 N. Reau. D. 63 C. 51 32 N. Reau. D. 64 CONTENTS. Station. Latitude. O I Scale. Page. TABLE LVII. Berlin, Prussia, A. 52 30 N. Reau. D. 65 u LVIII. Salzuflen, Germany, A. 52 5N. Reau. D. 66 14 LIX. Stettin, Germany, A'. 53 25 N. Reau. D. 67 II LX. Apenrade, Sleswick, C. 55 3N. Reau. D. 68 U LXI. Leith, Scotland, A. 55 59 N. Fahr. D. 69 u LXII. Leith, Scotland, A. 55 59 N. Reau. D. 70 it LXIII. Makerstoun, Scotland, A'3. 55 36 N. Reau. D. 71 u LXIV. Dublin, Ireland, B'4. 53 23 N. Reau. D. 71 (I LXV. Catharinenburg, Russia, A. 56 50 N. Reau. D. 72 « LXVI. Catharinenburg, Russia, A'6. 56 50 N. Reau. D. 73 11 LXVII. St. Petersburg, Russia, A'IO . 59 56 N. Reau. D. 73 u LXVIII. Helsingfors, Finland, A'3. 60 10 N. Reau. D. 74 it LXIX. St. Petersburg, Russia, A. 59 56 N. Reau. b. 75 11 LXX. Helsingfors, Finland, C. 60 10 N. Reau. D. 76 u LXXI. Christiania, Norway, C. 59 55 N. Reau.' D. 77 u LXXII. Drontheim, Norway, C. 63 26 N. Reau. D. 78 " LXXIII. Strait of Kara, Russia, A 70 37 N. Reau. D. 79 u LXXIV. Matoschkin Schar, Novaia Zemlia, A. 73 N. Reau. D. 80 a LXXV. Bossekop, Norway, C. 69 58 N. Reau. D. 81 tt LXXV. Bossekop, Norway, C. 1 69 58 N. Centig. G. 81 AFRICA AND AUSTRALIA. ll LXXVI. St. Helena, Africa, A'5. 15 55 S. Reau. D. 85 It LXXVII. Cape of Good Hope, Africa, A'5. 33 56 S. Reau. D. 85 ft LXXVIII. Hobarton, Tasmania, A'8. 42 53 S. Reau. D. 86 Monthly Corrections for Non-periodic Variations. Station. Latitude. Scale. Page. O ( TABLE LXXIX. Madras, India, 13 4N. Reau. D. 90 11 LXXX. Palermo, Sicily, 38 7N. Reau. D. 91 M LXXXI. Milan, Italy, 45 28 N. Reau. D. 92 " LXXXII. Geneva, Switzerland, 46 12 N. Reau. D. 94 it LXXXIII. Vienna, South Germany, 48 13 N. Reau. D. 96 it LXXXIV. Ratisbon, South Germany, 49 1 N. Reau. D. 97 u LXXXV. Stuttgard, South Germany, 48 46 N. Reau. D. 99 it LXXXVI. Carlsruhe, South Germany 49 IN. Reau. D. 100 it LXXXVII. Berlin, North Germany, 52 30 N. Reau. D. 102 it LXXXVIII. Copenhagen, Denmark, 55 41 N. Reau. D. 105 it LXXXIX. Paris, France, 48 50 N. Reau. D. 107 it xc. Zwanenburg, Holland, 52 23 N. Reau. D. 108 it XCI. London, England, 51 30 N. Reau. D. 110 E 5 CONTENTS. Station. TABLE XCII. Kinfauns Castle, Scotland, " XCIII. Tornea, Finland, " XCIV. Albany, N. Y., North America, " XCV. Salem, Mass., North America, " XCVI. Reikiavik, Iceland, " XCVII. Godthaab, Greenland, Force of Vapor and Relative Humidity. Hourly Corrections for Periodic Variations. " XCVIII. Greenwich, England, Force of Vapor, by Glaisher, " XCIX. Greenwich, England, Relative Humidity, by Glaisher, Latitude. 56 24 N. 65 50 N. 42 39 N. 42 31 N. 64 8N. 64 10 N. Scale. Reau. Reau. Reau. Reau. Reau. Reau. D. D. D. D. D. D. Page. 112 112 113 114 115 115 119 120 METEOROLOGICAL CORRECTIONS. ONE of the prominent objects of a prolonged series of meteorological observations is to determine the mean condition of the atmosphere, during a given interval of time, such as a day, a month, or a year, as to its temperature, moisture, and baro- metric pressure. In order to furnish the true means of these elements, free from the periodic changes which depend upon the daily course of the sun and upon the seasons, the observations ought to be made at equal intervals of time, and be so often repeated as actually to represent the sum of the variations which took place during the stated time. It is generally admitted that observations taken at every one of the twenty- four hours of the day give means which do not sensibly differ from the means which would be obtained from a still larger number of observations during the same time ; so that means derived from hourly observations may be considered as the true daily, monthly, and annual means of the year in which the observations were taken. However, as the means of a given month, or year, will generally be found some- what to differ from those of another year, at the same place, from causes which are not of a periodic nature, it is obvious that the absolute means can only be derived from the means of a series of years, in which the differences arising from these non- periodic variations may be considered as sufficiently balancing each other. Hourly observations can be expected only from a very few stations, favored with peculiar arrangements for the purpose. By far the larger number of observers must necessarily confine themselves to three or four observations a day. The means, therefore, deduced from such a set of observations, generally differ from the true means which would be given by hourly observations, by a quantity which varies with the hours selected for the observations. If that quantity, however, is known by having been previously determined for every hour, or set of hours, by a long series E 7 METEOROLOGICAL CORRECTIONS. of hourly observations taken at some station in a similar climatic situation, it is evident that, whatever be the hours at which observations are taken, the means derived from them can always be reduced to the true means by correcting them for that dif- ference. The following tables furnish such corrections, both for periodic and non-periodic variations of temperature, and for stations situated in various latitudes. They give the quantities which must be added to, or subtracted from, the hourly means, in order to obtain the true means of the day, of the month, and of the year. Two tables of the same description, for moisture, which may be considered as specimens of the kind, close the set. Two other tables, for correcting the mean barometric pressures, are found at the end of the Hypsometrical Tables, pp. 92, 93. E CORRECTIONS FOR TEMPERATURE. HOURLY CORRECTIONS FOR PERIODIC VARIATIONS, OR TABLES FOR REDUCING- THE MEANS OF THE OBSERVATIONS TAKEN AT ANY HOUR OF THE DAY TO THE TRUE MEAN TEMPERATURE OF THE DAY, OF THE MONTH, AND OF THE YEAR. HOURLY CORRECTIONS FOR PERIODIC VARIATIONS, OR CORRECTIONS TO BE APPLIED TO THE MEANS OF THE HOURS OF OBSERVATION, OR SETS OF HOURS, IN ORDER TO OBTAIN THE TRUE MEAN TEMPERATURES OF THE RESPECTIVE DAYS, MONTHS, AND OF THE YEAR. THE following set contains all the tables for correcting the means of observations on atmospheric temperature for the effect of diurnal variation which have been pub- lished by Dove, together with a few others of the same description. Dove's tables are found in two papers, published in the Memoirs of the Royal Academy of Berlin for 1846 and for 1856, and in the first Report on the Observations of the Meteoro- logical Institute of Prussia, Berlin, 1851. In the first paper are twenty-nine tables, in Reaumur's scale, nine of which have been republished, in Fahrenheit's scale, in the Proceedings of the British Associa- tion for 1847, and will also be found below. In that series the corrections have been formed by finding first the differences between the hourly and the true means, and then computing the observations by Bessel's formula, in order to eliminate the accidental irregularities due to the shortness of the period during which the observa- tions were taken. Calling x the horary angle reckoned from noon, Bessel's for- mula is tx = u + u' sin (x -f- U>) -f u" sin (2 x -f U") + u1" sin (3 a; + U1"). HOURLY CORRECTIONS FOR PERIODIC VARIATIONS. rObservatoire Physique Central de Russie. The observations made at Prague, Mu- nich, Geneva, with those at St. Bernard, Makerstoun, Greenwich, Brussels, and Wash- ington, were published by their respective Observatories ; those of Utrecht, by Buys- Ballot ; of Dublin, by Lloyd, in his Notes on the Meteorology of Ireland ; those of Schwerin were communicated in manuscript by Dippe ; the observations at Melville Island are published in No. 42 of the Parliamentary papers for 1854 ; and those at Bossekop, by Martins and Bravais, in the Voyage de la Commission Scientifique du Nord. The tables of this second series being mostly deduced from longer series of obser- vations than those in the first, when the same station is found in both, the table in the second is generally to be preferred. Glaisher's table for Greenwich has been taken from the Greenwich Observations. Captain Lefroy kindly furnished the tables for Toronto and Lake Athabasca. To him the author is also indebted for the observations made at Montreal by Mr. McCord, from which Table X. was computed. Table III., for Philadelphia, was deduced by the writer from the observations made at Girard College under the direction of Prof. A. D. Bache. In order to facilitate the selection of the tables, they are marked in the table of contents with capitals, which have the following signification : — A and B mean that the tables have been derived from hourly and bi-hourly obser- vations, and have been computed by Bessel's formula ; C, that the tables contain values obtained by interpolation. A', B', and C' indicate the tables based respectively on hourly and bi-hourly or partly interpolated observations, which give simply the differences between the hourly and the true means. The figures added to the letters indicate the number of years during which the observations used in forming the table were carried on. The stations are arranged, in each continent, in the order of their latitude. USE OF THE TABLES. In order to reduce meteorological means obtained from any set of hours to the true means, the table best suited to the purpose must first be selected. The diurnal vari- ation changing with the seasons, the latitude, the altitude, and the distance from the sea-shore, the station which comes nearest, in all these respects, to the station the observations of which are to be corrected, must be adopted. Suppose the thermometer has been observed at Baltimore, during the month of January, at 7 A. M., 1 P. M., and 7 P. M., and the monthly means of these hours to be respectively 27°, 35°, and 31° Fahrenheit. We take Table III., Philadelphia, it being the nearest in latitude and climatic situation. We find the correction for the hours 7, 1, and 7, and we have Observed Means. Corrections. True Means. For 7 A. M. 27° + 3°.63 = 30°.63 For 1 P. M. 35° — 3°.87 = 31°. 13 For 7 P. M. J31° — 1°.13 = 29°.87 Sums, 93* — r\37 = ¥1^63 Means, 31° — 0°.46 = 30°.54 True Mean for January. It is obvious that the corrections can be applied, either separately to each hour, as is done above, or collectively, in taking the mean of the three hourly corrections and applying it to the mean of the three observations, as in the last line, which is the more convenient method. Therefore, in order to find the correction for any set of hours, it suffices to take the mean of the corrections given in the table for the hours compos- ing the set. The true daily means can be found in the same way, and the true yearly means can be derived from the corrected monthly means, or by applying the correc- tions given in the last column. E 12 HOURLY CORRECTIONS FOR PERIODIC VARIATIONS. NORTH AMERICA. — SOUTH AMERICA. E 13 I. NORTH AMERICA. — WASHINGTON. Lat. 38° 54' N. Long. 77° 3' W. Greenw. Corrections to be applied to the Means of the Hours of Observation to obtain the true Mean Temperatures of the respective Days, Months, and of the Year. — DOVE. Degrees of Reaumur. Hour. 1 Jan. Feb. March. April. May. June. July. Aug. Sept. Oct. Nov. Dec. Year. A.M. 012' 1.15 1.26 1.60 1.95 2.33 2.87 2.94 2.31 2.39 1.72 ! 0.85 0.96 1.86 2 12' 1.28 1.86 2.14 2.40 3.15 3.21 3.25 3.07 2.75 2.2-3 ' 1.34 1.12 2.32 4 12' 1.45 2.18 2.67 2.75 3.56 3.64 3.83 3.49 3.15 2.8S 1.92 1.54 2.76 6 12' 1.88 2.32 2.76 2.59 2.20 2.23 2.12 2.81 3.02 3.1S 2.18 1.81 2.43 8 12' 1.48 1.76 1.68 1.05 0.32 -0.16 0.09 0.28 1.04 1.6S 1.88 1.68 1.07 10 12' -0.18 -0.58 -0.88 -0.76 -1.24 -1.82 -1.32 -1.81 -1.31 -1.25 -0.17 -0.15 -0.96 P.M. 0 12' -1.47 -2.05 -2.36 -2.39 -2.64 -2.69 -2.55 -2.97 -2.92 -2.8S -1.90 -1.57 -2.37 2 12' -2.60 -3.15 -3.35 -3.41 -3.57 -3.84 -3.49 -3.83 -3.74 -3.64 -2.44 -2.50 -3.30 4 12' -2.32 -3.05 -3.20 -3.51 -3.66 -4.29 -4.16 -3.59 -3.65 -3.29 -2.08 -2.19 -g.25 6 12' -0.76 -1.25 -1.73 -2.18 -2.44 -1.60 -2.24 -1.74 -1.88 -1.84 -1.59 -1.01 -1.69 8 12' -0.23 0.02 -0.05 0.06 0.27 0.44 -0.21 -0.26 -0.23 0.18 -0.22 -0.26 -0.04 10 12' 0.33 0.69 0.76 1.42 1.67 2.04 1.26 1.79 1.41 0.98 0.23 0.43 1.08 Means. 1.32 1.52 6.26 9.02 12.64 18.34 19.29 17.78 16.04 7.47 5.20 1.63 II. N. AMERICA. — PHILADELPHIA. Lat 39° 58' N. Long. 75° 11' W. Gr.— DOVE. Degrees of Reaumur. Hour. Jan. Feb March. April. May. June. July. Aug. Sept. Oct. Nov. Dec. ||Year. Midn. 0.64 1.27 1.33 1« 81 2.06 2.34 2 .10 1.94 2.12 1.70 1.31 0.62 1.60 1 0.94 1.48 1.61 2. 20 2 32 2.63 2.45 2.19 2.04 1.87 1.22 0.81 1.81 2 1,00 1.67 1.85 2. 58 2.64 2 .86 2.69 2.41 2.22 2.18 1.43 0.98 2.04 3 .13 1.95 2.00 2.76 2.96 3 .20 2.88 2.44 2.43 2.36 1.50 1.12 2.23 4 .24 2.05 2.08 2.97 3.27 3 .40 3.04 2.74 2.56 2.58 1.74 1.28 2.41 5 .36 2.13 2.50 3.06 3.32 3 .28 3.11 2.89 2.68 2.78 1.83 1.38 2.53 6 .50 2.24 2.44 2.84 2.63 2 .54 2.56 2.64 2.65 2.95 1.89 1.44 2.36 7 .60 2.28 2.24 2. 15 1. 68 1 .45 1 .53 1.84 1.92 2.40 1.88 1.36 1.86 8 .40 1.46 1.26 1. 17 0.65 0.40 0.54 0.67 0.78 1.08 1.21 1.14 0.98 9 0.78 0.57 0.35 0.23 -0. 39 -0 .52 -0.36 -0.20 -0.18 -0.15 0.26 0.52 0.08 10 0.02 -0.39 -0.46 -0.71 -1. 06 -1 .23 -1 .00 -1.05 -1.08 -1.17 -0.56 -0.22 -0.74 11 -0.68 -1.20 -1.38 -1.54 -1. 74 -1 .93 -1 .74 -1.84 -1.90 -1.96 -1.27 -0.92 -1.50 Noon. -1.21 -1.77 -1.97 -2.16 -2. 24 -2 .51 -2.26 -2.34 -2.45 -2.61 -1.77 -1.28 -2.05 1 -1.73 -2.36 -2.45 -2.86 -2. 71 -3.06 -2.66 -2.67 -2.88 -3.14 -2.26 -1.63 -2.53 2 -2.04 -2.66 -2.74 -3.29 -3. 11 -3 .32 -2.97 -3.01 -3.22 -3.45 -2.52 -1.84 -2.85 3 -2.10 -2.82 -3.07 -3.42 -3. 36 -3 .40 -3.15 -3.11 -3.26 -3.45 -2.48 -1.85 -2.96 4 -1.98 -2.69 -2.99 -3.44 -3. 46 -3 .44 -3 .06 -2.98 -3.17 -3.33 -2.24 -1.63 -2.87 5 -1.30 -2.18 -2.52 -3.14 -3. 26 -3.05 -2 .94 -2.70 -2.77 -2.46 -1.46 -1.10 -2.41 6 -0.91 -1.37 -1.60 -2.49 -2. 46 -2 .47 -2 .30 -2.03 -1.77 -1.33 -0.82 -0.64 -1.68 7 -0.51 -0.80 -0.88 -1.23 -1.28 -1.38 -1 .44 -1.02 -0.76 -0.52 -0.33 -0.31 -0.87 8 -0.20 -0.21 -0.20 -0.29 -0.06 0.06 0 .03 0.01 0.28 0.18 -0.14 -0.04 -0.05 9 0.07 0.11 0.90 0.35 0.65 0.82 0.57 0.60 0.81 0.65 0.29 0.09 0.49 10 0.33 0.48 0.77 0.93 1. 24 1 .37 1 .08 1.09 1.33 1.24 0.45 0.27 0.88 11 0.56 0.75 0.96 1.44 1.74 1.91 1.55 ] 1.44 1.64 1.63 0.79 0.40 1.23 Mean. 0.30 1.12 5.18 8.75 1 12. 18 16 .22 18 .19 17.52 14.66 8.72 3.67 | 0.58 || The numbers without sign must be added ; those with the sign — must be subtracted. 15 III. NORTH AMERICA. — PHILADELPHIA. Lat. 39° 58' N. Long. 75° 1 1' W. Greenw. Corrections to be applied to the Means of the Hours of Observation to obtain the true Mean Temperatures of the respective Days, Months, and of the Year. — GUYOT. Degrees of Fahrenheit. Hour. Jan. Feb. March. April. May. June. July. Aug. Sept. Oct. Nov. Dec. Year. Midnight. 1.47 2.90 2.90 4.13 4.68 5.28 4.70 4.37 4.47 3.80 2.70 1.40 3.57 1 2.13 3.37 3.63 4.88 5.25 5.93 5.57 4.93 4.60 4.17 2.73 1.83 4.08 2 2.20 3.57 4.17 5.88 5.95 6.45 6.10 5.43 5.00 4.87 3.20 2.201 4.59 3 2.57 4.43 4.50 6.28 6.68 7.23 6.53 5.50 5.47 5.27 3.37 2.53 503 4 2.80 4.67 4.70 6.75 7.38 7.68 6.90 6.17 5.77 5.77 3.90 2.87 5.45 5 3.07 4.83 5.63 6.95 7.48 7.40 7.03 6.50 6.03 6.23 4.10 3.10 5.70 6 3.40 5.10 5.50 6.45 5.93 5.73 5.80 5.93 5.97 6.60 4.23 3.23 5.32 7 3.63 5.17 5.03 4.90 3.80 3.28 3.50 4.13 4.33 5.37 4.20 3.07 4.20 8 3.17 3.33 2.80 2.50 1.48 0.90 1.27 1.50 1.93 2.40 2.70 2.57 2.16 9 1.77 1.33 0.80 0.58 -0.85 -1.15 -0.77 -0.43 -0.40 -0.37 0.57 1.17 0.19 10 0.07 -0.83 -1.03 -1.53 -2.38 -2.75 -2.20 -2.37 -2.43 -2.67 -1.27-0.50 -1.66 11 -1.40 -2.63 -3.10 -3.40 -3.90 -4.33 -3.87 -4.13 -4.27 -4.43 -2.87 -2.07 -3.37 Noon. -2.70 -3.93 -4.43 -4.72 -5.03 -5.63 -5.03 -5.27 -5.50 -5.90 -4.00 -2.87 -4.58 1 -3.87 -5.27 -5.50 -6.38 -6.08 -6.88 -5.93 -6.00 -6.47 -7.10 -5.10 -3.67 -5.69 2 -4.57 -5.97 -6.17 -7.12 -6.98 -7.45 -6.63 -6.83 -7.20 -7.80 -5.67 -4.13 -6.40 3 -4.70 -6.30 -6.90 -7.63 -7.55 -7.63 -7.03 -7.00 -7.33 -7.80 -5.60 -4.17 -6.64 4 -4.43 -6.00 -6.73 -7.65 -7.78 -7.73 -6.83 -6.70 -7.13 -7.53 -5.07 -3.67 -6.44 5 -2.90 -4.87 -5.67 -7.00 -7.33 -6.8s| -6.57 -6.07 -6.23 -5.57 -3.30 -2.47 -5.40 6 -2.03 -3.03 -3.60 -5.55 -5.53 -5.55-5.13 -4.57 -3.97 -3.03 -1.87 -1.43-3.77 7 -1.13 -1.77 -1.97 -2.70 -2.88 -3.10 -3.20 -2.30 -1.70 -1.20 -0.77 -0.70 -1.95 8 -0.43 -0.43 -0.43 -0.60 -0.13 0.15 0.08 0.03 0.63 0.37 0.15 -0.10 -0.11 9 0.17 0.30 0.73 0.85 1.48 1.85 1.33 1.37 1.83 1.43 0.63 0.20 1.01 10 0.77 1.13 1.73 2.15 2.80 3.10 2.47 2.47 3.00 2.77 1.00 0.60 2.00 11 1.27 1.73 2.17 3.30 3.93 4.30 3.53 3.23 3.70 3.63 1.77 0.90 2.78 6,6 0.69 1.04 0.95 0.45 0.20 0.09 0.34 0.68 1.00 1.79 1.18 0.90 0.78 7,7 1.25 1.70 1.53 1.10 0.46 0.09 0.15 0.92 1.32 2.09 1.72 1.19 1.13 8,8 1.37 1.45 1.18 0.85 0.68 0.53 0.67 0.77 1.01 1.38 1.35 1.24 1.04 9, 9 0.97 0.82 0.76 0.72 0.32 0.35 0.28 0.47 0.72 0.53 0.60 0.69 0.66 10, 10 0.42 0.15 0.35 0.31 0.21 0.18 0.14 0.05 0.29 0.05 -0.13 0.05 0.17, 7,2,9 -0.22 -0.17 -0.15 -0.53 -0.57 -0.77 -0.61 -0.44 -0.35 -0.33 -0.28 -0.29 -0.39 6,2,8 -0.53 -0.43 -0.37 -0.42 -0.39 -0.52 -0.37 -0.29 -0.20 -0.28 -0.43 -0.67 -0.41 6, 2, 10 -0.13 0.09 0.53 0.74 0.58 0.46 0.55 0.52 0.59 0.52 -0.15 -0.10 0.44 6,2,6 -1.07 -0.72 -1.42 -2.07 -2.19 -2.42 -1.43 -1.82 -1.73 -1.41 -1. 10! -0.78 -1.44 7,2 -0.47 -0.40 -0.57 -1.11 -1.59 -2.09 -1.57 -1.35 -1.44 -1.22 -0.74 -0.53 -1.09 8,2 -0.70-1.32 -1.68 -2.31 -2.75 -3.28 -2.68 -2.67 -2.90 -2.70 -1.49 -0.78 -2.10 8,1 -0.35 -0.97 -1.35 -1.94 -2.30 -2.99 -2.33 -2.25 -2.53 -2.35 -1.20 -0.55 -1.76 7, 1 -0.12 -0.05 -0.24 -0.74 -1.14 -1.80 -1.22 -0.94 -1.07 -0.87 -0.45 -0.30 -0.75 9,12,3,9 -1.37-2.15 -2.45 -2.73 -2.99 -3.14 -2.88-2.83 -2.85 -3.16 -2.39 -1.42 -2.53 16 IV. N. AMERICA. — FRANKFORT ARSENAL. Lat. 39° 57' N. Long. 75° 8' W. Greenw. Corrections to be applied to the Means of the Hours of Observation to obtain the true Mean Temperatures of the respective Days, Months, and of the Year. — DOVE. Degrees of Reaumur. Hours. Jan. Feb. March. April. May. June. July. Aug. Sept. Oct. Nov. Dec. Mean. Morn. 1 1.34 1.46 1.75 1.87 2.60 3.41 3.07 2.69 2.63 2.40 1.18 1.34 2.15 2 1.51 1.73 2.13 2.33 3.05 3.73 3.51 3.04 3.05 2.67 1.27 1.50 2.46 3 1.82 1.98 2.56 2.88 3.43 3.92 3.83 3.32 3.49 2.94 1.41 1.66 2.77 4 2.13 2.23 2.90 3.29 3.57 3.84 3.84 3.36 3.73 3.13 1.51 1.80 2.94 5 2 31 2.46 2.95 3.31 3.32 3.36 3.40 2.99 3.54 3.12 1.73 1.87 2.86 6 2.25 2.35 2.62 2.83 2.65 2.46 2.52 2.21 2.84 2.82 1.38 1.80 2.39 7 1.88 2.01 1.91 1.94 1.66 1.26 1.34 1.15 1.71 2.19 1.06 1.52 1.64 8 1.22 1.33 0.94 Q.85 0.57 -0.03 0.08 0.01 036 1.26 0.58 0.97 0.68 9 0.34 0.30 -0.07 -0.20 -0.45 -1.20 -1.06 -1.00 -0.96 0.12 -0.02 0.18 -0.34 10 -0.62 -0.72 -1.00 -1.05 -1.29 -2.11 -1.96 -1.78 -2.06 -1.13 -0.70 -0.76 -1.27 11 -1.54 -1.77 -1.76 -1.69 -1.97 -2.74 -2.64 -2.34 -2.89 -2.33 -1.12 -1.70 -2.04 Noon. . . -2.30 -2.60 -2.32 -2.22 -2.35 -3.17 -3.16 -2.78 -3.47 -3.35 -1.96 -2.45 -2.68 1 -2.85 -3.01 -2.74 -2.72 -3.07 -3.51 -3.58 -3.16 -3.86 -4.05 -2.38 -2.87 -3.15 2 -3.02 -3.18 -3.01 -3.19 -3.52 -377 -3.87 -3.48 -4.07 -4.36 -2.54 -2.89 -3.41 3 -2.92 -2.93 -3.10 -3.53 -3.78 -3.89 -3.94 -3.61 -4.02 -4.22 -2.40 -2.54 -3.41 4 -2.53 -2.44 -2.95 -3.55 -3.70 -3.75 -3.67 -3.42 -3.63 -3.66 -1.96 -1.94 -3.10 5 -1.90 -1.87 -2.50 -3.11 -3.20 -3.23 -3.00 -2.81 -2.84 -2.75 -1.52 -1.23 -2.50 6 -1.14 -1.11 -1.78 -2.23 -2.31 -2.33 -2.00 -1.83 -1.72 -1.65 -0.56 -0.55 -1.60 7 -0.37 -0.46 -0.92 -1.09 -1.19 -1.16 -0.83 -0.67 -0.48 -0.54 0.14 0.01 -0.63 8 0.29 0.12 -0.06 0.02 -0.10 0.07 0.28 0.43 0.66 0.43 0.69 0.42 0.27 9 0.76 0.66 0.61 0.85 0.80 1.17 1.17 1.29 1.49 1.17 1.02 0.71 0.98 10 1.02 0.93 1.05 1.32 1.43 2.02 1.79 1.84 1.96 1.66 1.15 0.90 1.42 11 1.18 1.18 1.31 1.50 1.85 2.61 2.24 2.15 2.18 1-96 0.91 1.06 1.67 MIdn. . . 1.19 1.36 1.48 1.62 2.01 3.04 2.63 2.40 2.35 2.18 1.15 1.20 1.88 6. 6 0.56 0.62 0.42 0.30 0.17 0.07 0.26 0.19 0.56 0.58 0.41 0.62 0.40 7. 7 0.76 0.78 0.50 0.42 0.24 0.05 0.26 0.24 0.62 0.83 0.60 0.76 0.51 8. 8 0.76 0.72 0.44 0.43 0.24 0.02 0.18 0.22 0.51 0.85 0.63 0.70 0.48 9. 9 0.55 0.48 0.27 0.33 0.18 -0.02 0.06 0.14 0.26 0.64 0.50 0.44 0.32 10.10 0.20 0.11 0.03 0.13 0.07 -0.05 -0.08 0.03 -0.05 0.26 0.23 0.07 0.08 7. 2. 9 -0.13 -0.17 -0.16 -0.13 -0.35 -0.45 -0.45 -0.35 -0.29 -0.33 -0.15 -0.22 -0.27 6. 2. 8 -0.16 -0.24 -0.15 -0.11 -0.32 -0.41 -0.36 -0.28 -0.19 -0.37 -0.16 -0.22 -0.25 6. 2.10 0.08 0.03 0.22 0.32 0.19 0.24 0.15 0.19 0.24 0.04 0.00 -0.06 0.14 6. 2. 6 -0.64 -0.65 -0.72 -0.86 -1.06 -1.21 -1.12 -1.03 -0.98 -1.06 -0.57 -0.55 -0.87 7. 2 -0.57 -0.59 -0.55 -0.63 -0.93 -1.26 -1.27 -1.17 -1.18 -1.09 -0.74 -0.69 -0.89 8. 2 -0.90 -0.93 -1.04 -1.17 -1.48 -1.90 -1.90 -1.74 -1.86 -1.55 -0.98 -0.96 -1.37 8. 1 -0.82 -0.84 -0.90 -0.94 -1.25 -1.77 -1.75 -1.58 -1.75 -1.40 -0.90 -0.95 -1.24 7. 1 -0.49 -0.50 -0.42 -0.39 -0.71 -1.13 -1.12 -1.10 -1.08 -0.93 -0.66 -0.68 -0.76 9.12.3.9 -1.03 -1.14 -1.22 -1.28 -1.45 -1.77 -1.75 -1.53 -1.74 -1.57 -0.84 -1.03 -1.36 7. 2.2(9) 0.10 0.04 -0.03 0.11 -0.07 -0.04 -0.05 0.06 0.16 0.04 0.14 0.01 0.04 Dail. ext. -0.36 -0.36 -0.08 -0.12 -0.11 0.02 -0.05 -0.13 -0.17 -0.62 -0.41 -0.51 -0.24 E The numbers without sign must be added ; those with the sign — must be subtracted. J7 V. N. AMERICA. — FRANKFORT ARSENAL. Lat. 39° 57' N. Long. 75° 8' W. Greenw. Corrections to be applied to the Means of the Hours of Observation to obtain the true Mean Temperatures of the respective Days, Months, and of the Year. — DOVE. Degrees of Fahrenheit. Hours. Jan. Feb. March April. May. June. July. Aug. Sept. Oct. Nor. Dec. Mean. Morn. 1 3.02 3.29 3.94 4.21 5.85 7.67 6.91 6.05 5.92 5.40 2.66 3.02 4.84 2 3.40 3.89 4.79 5.24 6.86 8.39 7.90 6.84 6.86 6.01 2.86 3.38 5.54 3 4.10 4.46 5.76 6.48 7.72 8.82 8.62 7.47 7.85 6.62 3.17 3.74 6.23 4 4.79 5.02 6.53 7.40 8.03 8.64 8.64 7.56 8.39 7.04 3.40 4.05 6.62 5 5.20 5.54 6.64 7.45 7.74 7.56 7.65 6.73 7.97 7.02 3.89 4.21 6.44 6 5.06 5.29 5.90 6.37 5.96 5.54 5.67 4.97 6.39 6.35 3.11 4.05 5.38 7 4.23 4.52 4.30 4.37 3.74 2.84 3.02 2.59 3.85 4.93 2.39 3.42 3.69 8 2.75 2.99 2.12 1.91 1.28 -0.07 0.18 0.02 0.81 2.84 1.31 2.18 1.53 9 0.77 0.68 -0.16 -0.45 -1.01 -2.70 -2.39 -2.25 -2.16 0.27 -0.05 0.41 -0.77 10 -1.40 -1.62 -2.25 -2.36 -2.90 -4.75 -4.41 -4.01 -4.64 -2.54 -1.58 -1.71 -2.86 11 -3.47 -3.98 -3.96 -3.80 -4.43 -6.17 -5.94 -5.27 -6.50 -5.24 -2.52 -3.83 -4.59 Noon. . . -5.18 -5.85 -5.22 -5.00 -5.29 -7.13 -7.11 -6.26 -7.81' -7.54 -4.41 -5.51 -6.03 1 -6.41 -6.77 -6.17 -6.12 -6.91 -7.90 -8.06 -7.11 -8.69 -9.11 -5.36 -6.46 -7.09 2 -6.80 -7.16 -6.77 -7.18 -7.92 -8.48 -8.71 -7.83 -9.16 -9.81 -5.72 -6.58 -7.67 3 -6.57 -6.59 -6.98 -7.94 -8.51 -8.75 -8.87 -8.12 -9.05 -9.50 -5.40 -5.72 -7.67 4 -5.69 -5.49 -6.64 -7.99 -8.33 -8.44 -8.26 -7.70 -8.17 -8.24 -4.41 -4.37 -6.98 5 -4.28 -4.21 -5.63 -7.00 -7.20 -7.27 -6.75 -6.32 -6.39 -6.19 -3.42 -2.77 -5.63 6 -2.57 -2.50 -4.01 -5.02 -5.20 -5.24 -4.50 -4.12 -3.87 -3.71 -1.26 -1.24 -3.60 7 -0.83 -1.04 -2.07 -2.45 -2.68 -2.61 -1.87 -1.51 -1.08 -1.22 0.32 0.02 -1.42 8 0.65 0.27 -0.14 0.05 -0.23 0.16 0.63 0.97 1.49 0.97 1 55 0.95 0.61 9 1.71 1.48 1.37 1.91 1.80 2.63 2.63 2.90 3.35 2.63 2.30 1.60 2.21 10 2.30 2.09 2.36 1.97 3.22 4.55 4.03 4.14 4.41 3.74 2.59 2.03 3.20 11 2.54 2.66 2.95 3.38 4.16 5.87 5.04 4.84 4.91 4.41 2.05 2.39 3.76 Midn. . . 2.68 3.06 3.33 3.65 4.52 6.84 5.92 5.40 5.29 4.91 2.59 2.10 4.23 6. 6 1.26 1.40 0.95 0.68 0.38 0.16 0.59 0.43 1.26 1.31 0.92 1.40 0.90 7. 7 1.71 1.76 1.13 0.95 0.54 0.11 0.59 0.54 1.40 1.87 1.35 1.71 1.15 3. 8 1.71 1.62 0.99 0.97 0.54 0.05 0.41 0.50 1.15 1.91 1.42 1.58 1.08 9. 9 1.24 1.08 0.61 0.74 0.41 -0.05 0.14 0.32 0.59 1.44 1.13 0.99 0.72 10.10 0.45 0.25 0.07 0.29 0.16 -0.11 -0.18 0.07 -0.11 0.59 0.52 0.16 0.18 7. 2. 9 -0.29 -0.38 -0.36 -0.29 -0.79 -1.01 -1.01 -0.79 -0.65 -0.74 -0.34 -0.50 -0.61 6. 2. 8 -0.36 -0.54 -0.39 -0.25 -0.72 -0.92 -0.81 -0.63 -0.43 -0.83 -0.36 -0.50 -0.56 i 6. 2.10 0.18 0.07 0.50 0.72 0.43 0.54 0.34 0.43 0.54 0.09 0.00 -0.14 0.32 | 6. 2. 6 -1.44 -1.46 -1.62 -1.94 -2.39 -2.72 -2.52 -2.32 -2.21 -2.39 -1.2& -1.24 -1.96 7. 2 -1.28 -1.33 -1.24 -1.42 -2.09 -2.84 -2.86 -2.63 -2.66 -2.45 -1.67 -1.55 -2.00 8. 2 -2.03 -2.09 -2.34 -2.63 -3.33 -4.28 -4.28 -3.92 -4.19 -3.49 -2.21 -2.16 -3.08 8. 1 -1.85 -1.89 -2.03 -2.12 -2.81 -3.98 -3.94 -3.56 -3.94 -3.75 -2.03 -2.14 -2.79 7. 2 -1.10 -1.13 -0.95 -0.88 -1.60 -2.54 -2.52 -2.27 -2.43 -2.09 -1.49 -1.53 -1.71 9.12.3.9 -2.32 -2.57 -2.75 -2.88 -3.26 -3.98 -3.94 -3.44 -3.92 -3.53 -1.89 -2.32 -3.06 7. 2.2(9) 0.23 0.09 0.07 0.25-0.16 -0.09 -0.11 0.14 0.36 0.09 0.32 0.02 0.09 Dail.ext. ^smj*. -0.81 -0.81 -0.18 -0.27!-0.25 0.04 -0.11 -0.29 -0.38 -1.39-0.92 -1.15 "0-51 E The numbers without sign must be added ; those with the sign — must be subtracted. 18 VI. N. AMERICA. — TORONTO. LaL 43° 39' 35" N. Long. 79° 21' 30" W. Greenw. Corrections to be applied to the Means of the Hours of Observation to obtain the true Mean Temperatures of the respective Days, Months, and of the Year. — DOVE. Degrees of Fahrenheit. Hours. Jan. Feb. March. April. May. June. July. Aug. Sept. Oct. Nor. Dec. Mean. Mora. 1 1.87 0.92 3.04 4,43 5.90 5.94 6.30 5.06 5.74 4.16 1.91 1.04 3.87 2 2.16 1.33 3.56 5.11 6.64 6.62 7.13 5.68 6.68 4.68 2.14 1.13 4.41 3 2.39 1.91 4.19 5.76 7.36 7.29 8.01 6.82 7.63 5.04 2.39 1.40 5.02 4 2.68 2.66 4.75 6.17 7.65 7.56 8.44 7.61 8.19 5.20 2.61 1.78 5.45 5 3.02 3.40 4.95 5.94 7.07 6.98 7.88 7.49 7.94 5.02 2.68 2.16 5.38 6 3.29 3.92 4.61 4.97 5.49 5.38 6.14 6.14 6.71 4.48 2.52 2.39 4.68 7 3.26 3.98 3.65 3.38 3.17 3.04 3.49 3.67 4.52 3.44 2.05 2.27 3.33 8 2.72 3.40 2.12 1.42 0.68 0.43 0.52 0.68 1.78 1.91 1.15 1.71 1.55 9 1.58 2.33 0.29 -0.50 -1.51 -1.85 -2.12 -2.09 -1.06 -0.05 -0.07 0.79 -0.36 10 0.00 0.61 -1.60 -2.07 -3.08 -3.47 -4.01 -4.14 -3.62 -2.25 -1.46 -0.84 -2.12 11 -1.71 -1.15 -3.26 -3.26 -4.14 -4U6 -5.15 -5.33 -5.72 -4.39 -2.79 -1.44 -3.58 Noon. . . -3.11 -2.66 -4.55 -4.19 -5.00 -5.18 -5.90 -5.96 -7.25 -6.12 -3.78 -2.30 -4.66 1 -3.89 -3.67 -5.36 -5.00 -5.99 -5.94 -6.59 -6.50 -8.33 -7.11 -4.28 -2.77 -545 2 -3.98 -4.07 -5.72 -5.76 -7.16 -6.89 -7.47 -7.11 -8.89 -7.25 -4.14 -2.86 -594 3 -3.53 -3.92 -5.60 -6.35 -8.15 -7.74 -8.28 -7.70 -8.87 -6.53 -3.51 -2.66 -6.08 4 -2.84 -3.38 -5.02 -6.48 -8.51 -8.08 -8.55 -7.81 -8.12 -5.18 -2.52 -2.23 -5.72 5 -2.14 -2.63 -4.03 -5.94 -7.76 -7.43 -7.83 -6.95 -6.59 -3.53 -1.44 -1.71 -4.84 6 -1.62 -1.89 -2.75 -4.66 -5.83 -5.65 -5.94 -5.00 -4.43 -1.91 -0.45 -1.13 -3.44 7 -1.24 -1.24 -1.31 -2.81 -3.08 -3.04 -3.17 -2.25 -1.94 -0.50 0.32 -0.54 -1.73 8 -0.88 -0.68 0.05 -0.77 -0.16 -0.18 -0.18 0.65 0.43 0.65 0.86 0.02 -0.02 9 -0.43 -0.25 1.15 1.06 2.30 2.30 2.39 2.97 2.30 1.53 1.17 0.47 1.42 10 0.16 0.11 1.89 2.41 3.94 3.98 4.14 4.32 3.58 2.25 1.37 0.81 2.41 11 0.83 0.38 2.34 3.26 4.82 4.93 5.11 4.77 4.37 2.90 1.53 0.97 3.02 Midn. . . 1.42 0.63 2.66 3.85 5.33 5.45 5.64 4.84 5.00 3.56 1.71 1.01 3.42 6. 6 0.83 1.01 0.95 0.16 -0.18 0.14 0.11 0.56 1.13 1.28 1.04 0.63 0.61 7. 7 1.01 1.27 1.17 0.29 -0.05 0.00 0.16 0.72 1.28 1.49 1.19 0.86 0.81 8. 8 0.92 1.37 1.08 0.34 0.27 0.14 0.16 0.68 1.10 1.28 1.01 0.86 0.77 9. 9 0.59 0.99 0.72 0.29 0.41 0.23 0.14 0.45 0.63 0.74 0.56 0.63 0.54 10.10 0.07 0.36 0.14 0.16 0.43 0.27 0.07 0.09 -0.02 0.00 -0.05 0.23 0.14 7. 2. 9 -0.38 -0.11 -0.32 -0.45 -0.56 -0.52 -0.54 -0.16 -0.70 -0.77 -0.32 -0.05 -0.41 6. 2. 8 -0.52 -0.27 -0.36 -0.52 -0.61 -0.56 -0.50 -0.11 -0.59 -0.70 -0.25 -0.16 -0.43 6. 2.10 -0.18 -0.02 0.27 0.54 0.77 0.83 0.95 1.13 0.47 -0.18 -0.09 0.11 0.38 6. 2. 6 -0.77 -0.68 -1.28 -1.82 -2.50 -2.39 -2.43 -1.98 -2.21 -1.55 -0.70 -0.54 -1.58 7. 2 -0.36 -0.05 -1.04 -1.19 -2.00 -1.94 -2.00 -1.73 -2.18 -1.91 -1.06 -0.29 -1.31 8. 2 -0.63 -0.34 -1.80 -2.18 -3.24 -3.24 -3.49 -3.22 -3.56 -2.68 -1.51 -0.59 -2.21 8. 1 -0.59 -0.14 -1.62 -1.80 -2.66 -2.77 -3.04 -2.93 -3.29 -2.61 -1.58 -0.54 -1.96 7. 1 -0.32 0.16 -0.86 -0.81 -1.42 -1.46 -1.55 -1.42 -1.91 -1.85 -1.13 -0.25 -1.06 9.12.3.9 -1.37 -1.15 -2.18 -2.50 -3.08 -3.13 -3.49 -3.20 -3.71 -2.79 -1.55 -0.92 -2.43 7. 2.2(9) -0.41 -0.16 0.07 -0.07 0.16 0.18 0.20 0.63 0.07 -0.18 0.07 0.09 0.05 The numbers without sign must be added ; those with the sign — must be subtracted. VII. N. AMERICA. — TORONTO. Lai. 43° 39' 35" N. Long. 79° 21' 30" W. Greenw. Corrections to be applied to .the Means of the Hours of Observation to obtain the true Mean Temperatures of the respective Days, Months, and of the Year. — DOVE. Degrees of Reaumur. Hours. Jan. Feb. March. April. May. June. July. Aug. Sept. Oct. Nov. Dec. Mean. Morn. 1 0.83 0.41 1.35 1.97 2.62 2.64 2.80 2.25 2.55 1.85 0.85 0.46 1.72 2 0.96 0.59 1.58 2.27 2.95 2.94 3.17 2.57 2.97 2.08 0.95 0.50 1.96 3 1.06 0.85 1.86 2.56 3.27 3.24 3.56 3.03 3.39 2.24 1.06 0.62 2.23 4 1.19 1.18 2.11 2.74 3.40 3.36 3.75 338 3.64 2.31 1.16 0.79 2.42 5 1.34 1.51 2.20 2.64 3.14 3.10 3.50 3.33 3.53 2.23 1.19 0.96 2.39 6 1.46 1.74 2.05 2.21 2.44 2.39 2.73 2.73 2.98 1.99 1.12 1.06 2.08 7 1.45 1.77 1.62 1.50 1.41 1.35 1.55 1.63 2.01 1.53 0.91 1.01 1.48 8 1.21 1.51 0.94 0.63 0.30 0.19 0.23 0.30 0.79 0.85 0.51 0.76 0.69 9 0.70 0.99 0.13 -0.22 -0.67 -0.82 -0.94 -0.93 -0.47 -0.02 -0.03 0.35 -0.16 10 -0.00 0.27 -0.71 -0.92 -1.37 -1.54 -1.78 -1.84 -1.61 -1.00 -0.65 -0.15 -0.94 11 -0.76 -0.51 -1.45 -1.45 -1.84 -1.98 -2.29 -2.37 -2.54 -1.95 -1.24 -0.64 -1.59 Noon. . . -1.38 -1.18 -2.02 -1.86 -2.22 -2.30 -2.62 -2.65 -3.22 -2.72 -1.68 -1.02 -2.07 1 -1.73 -1.63 -2.38 -2.22 -2.66 -2.64 -2.93 -2.89 -3.70 -3.16 -1.90 -1.23 -2.42 2 -1.77 -1.81 -2.54 -2.56 -3.18 -3.06 -3.32 -3.16 -3.95 -3.22 -1.84 -1.27 -2.64 3 -1.57 -1.74 -2.49 -2.82 -3.62 -3.44 -3.68 -3.42 -3.94 -2.90 -1.56 -1.18 -2.70 4 -1.26 -1.50 -2.23 -2.88 -3.78 -3.59 -3.80 -3.47 -3.61 -2.30 -1.12 -0.99 -2.54 5 -0.95 -1.17 -1.79 -2.64 -3.45 -3.30 -3.48 -3.09 -2.93 -1.57 -0.64 -0.76 -2.15 6 -0,72 -0.84 -1.22 -2.07 -2.59 -2.51 -2.64 -2.22 -1.97 -0.85 -0.20 -0.50 -1.53 7 -0.55 -0.55 -0.58 -1.25 -1.37 -1.35 -1.41 -1.00 -0.86 -0.22 0.14 -0.24 -0.77 8 -0.39 -0.30 0.02 -0.34 -0.07 -0.08 -0.08 0.29 0.19 0.29 0.38 0.01 -0.01 9 -0.19 -0.11 0.51 0.47 1.02 1.02 1.06 1.32 1.02 0.68 0.52 0.21 0.63 10 0.07 0.05 0.84 1.07 1.75 1.77 1.84 1.92 1.59 1.00 0.61 0.36 1.07 11 0.37 0.17 1.04 1.45 2.14 2.19 2.27 2.12 1.94 1.29 0.68 0.43 1.34 Midn. . . 0.63 0.28 1.18 1.71 2.37 2.42 2.53 2.15 2.22 1.58 0.76 0.45 1.52 6. 6 0.37 0.45 0.42 0.07 -0.08 -0.06 0.05 0.25 0.50 0.57 0.46 0.28 0.27 7. 7 0.45 0.61 0.52 0.13 0.02 0.00 0.07 0.32 0.57 0.66 0.53 0.38 0.36 8. 8 0.41 0.61 0.48 0.15 0.12 0.06 0.07 0.30 0.49 0.57 0.45 0.38 0.34 9. 9 0.26 0.44 0.32 0.13 0.18 0.10 0.06 0.20 0.28 0.33 0.25 0.28 0.24 10.10 0.03 0.16 0.06 0.07 0.19 0.12 0.03 0.04 -0.01 0.00 -0.02 0.10 0.06 7. 2. 9 -0.17 -0.05 -0.14 -0.20 -0.25 -0.23 -0.24 -0.07 -0.31 -0.34 -0.14 -0.02 -0.18 6. 2. 8 -0.23 -0.12 -0.16 -0.23 -0.27 -0.25 -0.22 -0.05 -0.26 -0.31 -0.11 -0.07 -0.19 6. 2.10 -0.08 -0.01 0.12 0.24 0.34 0.37 0.42 0.50 0.21 -0.08 -0.04 0.05 0.17 6. 2. 6 -0.34 -0.30 -0.57 -0.81 -1.11 -1.06 -1.08 -0.88 -0.98 -0.69 -0.31 -0.24 -0.70 7. 2 -0.16 -0.02 -0.46 -0.53 -0.89 -0.86 -0.89 -0.77 -0.97 -0.85 -0.47 -0.13 -0.58 8. 2 -0.28 -0.15 -0.80 -0.97 -1.44 -1.44 -1.55 -1.43 -1.58 -1.19 -0.67 -0.26 -0.98 8. 1 -0.26 -0.06 -0.72 -0.80 -1.18 -1.23 -1.35 -1.30 -1.46 -1.16 -0.70 -0.24 -0.87 7. 1 -0.14 0.07 -0.38 -0.36 -0.63 -0.65 -0.69 -0.63 -0.85 -0.82 -0.50 -0.11 -0.47 9.12.3.9 -0.61 -0.51 -0.97 -1.11 -1.37 -1.39 -1.55 -1.42 -1.65 -1.24 -0.69 -0.41 -1.08 7. 2.2(9) -0.18 -0.07 0.03 -0.03 0.07 0.08 0.09 0.28 0.03 -0.08 0.03 0.04 0.02 Dail.ext. -0.16 -0.02 -0.17 -0.07 -0.19 -0.12 -0.03 -0.05 -0.16 -0.46 -0.36 -0.11 -0.14 E The numbers without sign must be added ; those with the sign — must be subtracted. 20 VIII. NORTH AMERICA. — TORONTO. Lat. 43° 40' N. Long. 79° 21' W. Greenw. Corrections to be applied to the Means of the Hours of Observation to obtain the true Mean Temperatures of the respective Days, Months, and of the Year. — LEFROY. Degrees of Fahrenheit. Hour. Jan. Feb. March. April. May. June. July. Aug. Sept. Oct. Nov. Dec Year. Midnight 1.47 1.73 2.63 3.22 5.02 5.15 6.37 5.33 5.96 3.22 1.80 0.90 3.57 1 1.95 2.09 £.11 3.79 5.93 6.00 7.13 6.06 4.57 3.80 2.10 1.50 4.00 2 2.05 2.46 3.47 4.48 6.77 6.70 7.68 6.69 5.17 4.13 2.36 1.85 4.48 3 2.20 2.82 3.76 5.08 7.45 7.50 8.41 7.29 5.59 4.31 2.66 1.96 4.92 4 2.28 3.20 4.07 5.38 7.93 8.06 9.03 7.63 6.18 4.64 2.85 2.04 5.27 5 2.46 3.62 4.35 5.75 7.83 7.88 .9.02 7.89 6.77 4.77 2-76 2.07 5.43 6 1.83 4.23 4.75 5.48 5.40 5.21 5.92 6.57 6.17 4.71 2.52 2.39 4.60 7 1.94 4.34 3.93 3.22 2.43 2.41 2.38 3.28 3.68 3.94 2.52 2.55 3.05 8 1.66 3.29 1.89 1.09 0.06 0.10 -0.31 0.21 1.02 1.66 1.53 2.12 1.25 9 10 0.63 -0.59 1.02 -0.25 -0.95 -1.91 -1.01 -2.45 -2.11 -3.81 -1.82 -3.49 -2.39 -3.98 -2.26 -4.18 -1.52 -3.47 -1.01 -2.93 0.01 -1.41 0.92 -0.53 -0.82 -2.47 11 -1.70 -2.44 -3.14 -3.85 -4.92 -4.77 -5.49 -5.57 -4.85 -4.33 -2.44 -1.72 -3.77 Noon. -2.48 -3.56 -4.15 -4.86 -5.87 -5.88 -6.72 -6.39 -5.95 -5.36 -3.34 -2.52 -4.76 1 -2.92 -4.49 -4.79 -5.72 -6.83 -6.59 -7.58 -7.11 -6.58 -5.76 -3.74 -3.06 -5.43 2 3 -3.20 -3.16 -4.88 -4.90 -5.31 -5.15 -6.14 -6.16 -7.13 -7.03 -7.20-7.37 -8.26 -8.34 -7.62 -7.98 -6.96 -7.01 -6.04 -5.85 -3.82 -3.64 -3.31 -3.13 -5.81 -5.82 4 -2.63 -4.47 -4.65 -5.81 -7.17-7.60 -8.25 -7.79 -6.75 -5.17 -2.83 -2.47 -5.47 5 -1.68 -3.30 -3.92 -5.12 -6.80 -7.18 -7.93 -7.20 -5.78 -3.40 -1.58 -1.49 -4.61 6 -0.90 -1.87 -2.35 -3.42 -5.05 -5.73 -6.57 -5.39 -3.16 -1.37 -0.76 -0.82 -3.12 7 -0.40 -0.98 -0.91 -0.94 -2.19 -2.99 -3.28 -1.64 -0.43 -0.25 -0.15 -0.47 -1.22 8 -0.12 -0.13 0.03 0.66 0.43 0.33 0.68 1.23 0.81 0.48 0.19 -0.12 0.38 9 0.07 0.52 1.00 1.78 2.31 2.44 2.99 2.70 1.90 1.25 0.44 0.18 1.46 10 0.44 1.06 1.63 2.59 3.29 3.80 4.24 3.73 2.94 1.97 0.78 0.47 2.24 11 0.77 1.60 2.01 3.07 4.20 4.76 5.21 4.54 3.61 2.68 1.13 0.59 2.85 6, 6 0.46 1.18 1.20 1.03 0.17 -0.26 -0-32 0.59 1.50 1.67 1.38 0.78 0.74 7, 7 0.77 1.67 1.51 1.14 0.12 -0.29 -0.45 0.82 1.62 1.84 1.18 1.04 0.91 8, 8 0.77 1.58 0.96 0.87 0.24 0.21 0.18 0.72 0.91 1.45 0.98 1.15 0.82 9,9 0.35 0.77 0.37 0.38 0.10 0.31 0.30 0.22 0.19 0.10 0.22 0.55 0.32 10, 10 -0.07 0.05 -0.14 -0.07 -0.26 0.25 0.13 -0.22 -0.26 -0.48 -0.31 -0.03 -0.11 6, 2, 10 -0.31 0.14 0.36 0.64 0.52 0.66 0.63 0.89 0.72 0.21 -0.17 -0.15 0.34 7,2,9 -0.40 -0.01 -0.09 -0.38 -0.80 -0.73 -0.96 -0.55 -0.46 -0.28 -0.29 -0.19 -0.43 9,12,3,9 -1.23 -1.73 -2.01 -2.56 -3.22 -3.16 -3.61 -3.48 -3.14 -2.74 -1.63 -1.14 -2.48 Mean. 25.82 23.70 29.79 41.99 52.92 60.67 66.39 65.86 57.55 44.14 36.18 27.40 44.37 The numbers without sign must be added ; those with the sign — must be subtracted. 21 IX. NORTH AMERICA. — TORONTO. Lat. 43° 40' N. Long. 79° 21' W. Gr. Corrections to be applied to the Means of the Hours of Observation to obtain the true Mean Temperatures of the respective Days, Months, and of the Year. — DOVE. Degrees of Reaumur. Hour. Jan. Feb. March. April. May. June. July. Aug. Sept. Oct. Nov. Dec. Year. Midn. 6.6S 0.81 1.10 1.45 2.24 2.36 2.91 2.43 1.76 1.44 0.81 0.40 1.53 1 0.88 0.98 1.31 0.78 2.62 2.67 3.29 2.72 2.03 1.71 0.94 0.66 1.80 2 0.92 1.13 1.48 2.08 2.99 2.98 3.54 3.02 2.29 1.85 1.06 0.83 2.01 3 0.99 1.32 1.61 2.17 3.31 3.32 3.86 3.32 2.49 1.92 1.20 0.88 2.20 4 1.03 1.45 1.78 2.36 3.52 3.58 4.14 3.48 2.76 2.06 1.28 0.90 2.36 5 1.11 1.61 2.01 2.52 3.49 3.49 4.16 3.57 3.04 2.13 1.23 0.91 2.44 6 0.79 1.86 2.13 2.47 2.40 2.32 2.74 2.92 2.74 2.04 1.11 1.09 2.05 7 0.83 1.92 1.75 1.45 1.08 1.07 1.11 1.60 1.60 1.70 1.11 1.16 1.36 8 0.73 1.47 0.87 0.45 0.09 0.03 -0.05 0.15 0.38 0.70 0.64 0.97 0.56 9 0.30 0.44 -0.10 -0.43 -0.94 -0.81 -1.03 -0.96 -0.69 -0.49 -0.04 0.45 -0.36 10 -0.25 -0.45 -0.87 -1.11 -1.69 -1.55 -1.78 -1.84 -1.57 -1.35 -0.68 -0.20 -1.11 11 -0.77 -1.16 -1*41 -1.72 -2.20 -2.12 -2.47 -2.48 -2.20 -1.96 -1.13 -0.75 -1.70 Noon. -1.12 -1.69 -1.87 -2.18 -2.62 -2.61 -3.05 -3.04 -2.64 -2.36 -1.48 -1.11 -2.15 1 -1.34 -2.07 -2.16 -2.60 -3.03 -2.93 -3.46 -3.25 -2.90 -2.55 -1.66 -1.42 -2.45 2 -1.46 -2.25 -2.41 -2.76 -3.18 -3.12 -3.84 -3.51 -3.08 -2.70 -1.69 -1.49 -2.62 3 -1.44 -2.24 1 -2.32 -2.80 -3.21 -3.29 -3.92 -3.66 -3.09 -2.60 -1.62 -1.38 -2.63 4 -1.21 -2.00 -2.11 -2.62 -3.19 -3.40 -3.93 -3.60 -3.00 -2.28 -1.22 -1.09 -2.47 5 -0.77 -1.47 -1.78 -2.30 -3.02 -3.13 -3.72 -3.35 -2.57 -1.50 -0.68 -0.67 ! -2.08 6 -0.40 -0.82 -1.03 -1.50 -2.24 -2.55 -3.08 -2.51 -1.38 -0.59 -0.32 -0.36'! -1.40 7 -0.17 -0.38 -0.38 -0.37 -0.96 -1.33 -1.54 -0.74 -0.18 -0.10 -0.06 -0.21 -0.53 8 -0.03 0.00 0.05 0.33 0.24 0.13 0.33 0.56 0.39 0.23 0.08 -0.04 0.19 9 0.06 0.28 0.50 0.81 1.02 1.09 1.38 1.26 0.85 0.57 0.20 0.07 0.67 10 0.23 0.53 0.79 1.16 1.45 1.69 1.93 1.72 1.32 0.90 0.36 0.20 1.02 11 0.37 0.76 1.08 1.38 1.86 2.12 2.45 2.07 1.60 1.20 0.52 0.25 1.31 MeanJ -2.97 1-3.88 |-0.98 4.72 9.29 12.75 15.11 15.00 11.37 5.42 1.88 -2.031 X. NORTH AMERICA. — MONTREAL. Lat. 45° 30' N. Long. 73° 22' E. Gr. Degrees of Fahrenheit. Hour. Aug. Sept. Oct. NOT. Dec. Jan. Feb. March. April. May. June. July. Year. Midn. 4.00 3.89 2.83 1.36 1.68 1.10 1.28 1.31 2.52 4.55 5.25 4.39 2.85; 2 5.39 4.34 4.01 1.59 1.00 2.36 2.69 2.88 4.37 6.95 7.42 7.17 4.20 4 6.34 5.60 4.84 1.81 1.38 2.88 3.36 5.56 7.09 6.95 7.18 7.57 4.96 6 5.99 4.59 4.83 1.36 1.32 3.54 3.90 5.22 5.56 6.61 5.55 5.46 4.50 8 2.79 2.19 2.52 0.78 0.92 3.10 3.22 3.30 3.44 3.06 0.88 0.60 2.24 10 -1.74 -1.48 -0.99 -0.41 0.21 -0.21 -0.81 -0.03 -0.79 -0.97 -1.75 -2.85 -0.93 Noon. -5.63 -5.43 -4.22 -1.87 -1.22 -2.82 -3.50 -4.23 -5.01 -7.10 -5.17 -5.46 -4.30 2 -7.93 -6.60 -6.96 -2.37 -2.54 -4.07 -5.43 -6.49 -5.99 -8.76 -7.72 -7.36 -6.02 4 -7.72 -6.70 -5.62 -2.52 -3.22 -3.88 -3.60 -5.96 -5.79 -8.35 -7.00 -7.51 -5.65 6 -5.63 -2.80 -2.79 -1.04 -1.30 -1.77 -1.50 -3.43 -3.88 -3.87 -5.02 -5.40 -3.20 8 -0.70 0.10 -0.25 0.03 0.02 -0.90 -0.59 -1.23 -0.81 -1.61 -1.10 -0.67 -0.65 10 1.99 2.39 1.42 1.18 0.89 0.17 0.22 -0.30 0.64 -1.87 2.47 2.64 1.30 Mean. 66.40 57.70 48.31 30.39 23.42 8.10 20.84 27.31 42.27 56.61 64.38 70.39 43.01 The numbers without sign must be added ; those with the sign — must be subtracted. 22 X. NORTH AMERICA. — MONTREAL, Continued. Corrections to be applied to the Means of the Hours of Observation to obtain the true Mean Temperatures of the respective Days, Months, and of the Year. Degrees of Fahrenheit. Hour. Aug. Sept. Oct. Nov. Dec. Jan. Feb. March. April. May. June. July. Year. A.M.I 5.03 4.92 2.53 1.16 0.88 1.43 1.61 4.38 3.12 4.85 4.55 5.07 3.30 3 5.99 5.20 3.61 1.58 1.79 1.30 2.72 5.18 5.14 6.51 5.10 6.80 4.25 5 6.44 5.43 4.45 2.08 2.21 1.87 3.95 6.84 6.54 6.56 6.30 7.76 5.05 7 2.10 3.47 3.61 2.01 2.08 1.98 5.22 7.07 3.84 3.56 4.72 3.04 3.56 9 -0.58 0.73 0.77 0.63 1.14 1.16 3.99 2.96 0.71 0.50 -0.02 0.22 1.02 11 -3.61 -2.20 -2.73 -1.35 -0.49 -1.08 -0.17 -2.51 -2.48 -2.79 -3.42 -3.21 -2.17 j P.M.I -6.61 -5.12 -5.41 -3.47 -2.38 -1.49 -4.80 -7.41 -4.93 -5.78 -597 -6.08 -4.95 3 -7.34 -6.65 -5.80-3.22 -2.78 -2.36 -6.08 -9.03 -6.33 -6.46 -6.93 -8.01 -5.91 5 -5.47 -5.S3 -3.15-1.19 -1.44 -0.63 -4.12 -6.48 -5.63 -6.62 -6.18 -6.53 -4.43 7 -1.45 -0.62 -1.00-0.44 -0.70 -0.60 -1.23 -2.40 -2.93 -3.50 -3.17 -2.88 -1.74 9 1.58 1.32 0.32 0.13 -0.71 -0.66 -0.96 -0.75 0.44 0.61 1.58 1.17 0.34 11 3.10 3.02 2.47 1.48 0.22 0.61 0.24 1.78 2.06 2.52 3.55' 3.39 2.02 Mean. 69.69 57.53 44.70 32.76 15.91 18.96 14.52 22.50 34.47 51.33 65.08 67.42 || 41.24 XI. NORTH AMERICA. — SITKA. Lat. 57° 3' N. Long. 135° 18' W. Gr.— DOVE. Degrees of Reaumur. Hour. |i Jan. Feb. 'March. April. May. June. July. Aug. Sept. Oct. Nov. Dec j Year. Midn. 0.33 0.58 0.97 1.51 1.80 1.81 1.68 1.34 .07 1.19 0.41 0.28 1.08 1 1 0.34 0.66 1.09 1.68 2.04 2.06 1.88 1.53 .18 1.11 0.46 0.33 1.20 2 0.35 0.72 1.17 1.81 2.20 2.25 2.04 1.66 .33 1.18 0.49 0.33 jl 1.29) 3 0.51 0.78 1.36 1.89 2.43 2.49 2.16 1.77 .24 0.64 0.48 0.18 i 1.33 4 0.45 0.86 1 1.47 2.02 2.55 2.57 2.20 1.82 .29 0.68 0.49 0.18 1.3& 5 0.45 0.83 1.57 2.07 2.39 2.47 2.95 1.89 .33 0.70 0.49 0.14 1.52 6 0.45 0.84 1.56 1.89 1.76 1.77 1.67 1.62 .33 0.78 0.46 0.18 1.26 7 0.52 0.82 1.37 1.13 0.96 1.08 1 0.96 1.09 .05 0.58 0.40 0.17 0.85 S ! 0.48 0.76 0.75 0.31 0.00 0.26 0.26 0.40 0.47 0.53 0.33 0.12 0.39 9 ' 0.39 0.49 -0.08 -0.63 -0.82 -0.52 1 -0.58 -0.26 -0.17 0.12 0.23 0.10 j-0.15 10 0.16 -0.03 -0.69 -1.12 -1.35 -1. 28 j -1.27 -0.95 -0.73 -0.28 0.00 -0.11 •• -0.64 i 11 -0.19 -0.60 -1.29 -1.68 -1.75 -1.70 -1.97 -1.57 -1.28 -0.75 -0.35 -0.lljj-l.il Noon. -0.57 -1.05 -1.71 -2.13 -2.17 -2.11 -2.11 -2.04 - .65 -1.14 -0.72 -0.32 ;- .48 1 -0.83 -1.36 -1.74 -2.33 -2.35 -2.35 -2.25 -2.33 - .56 -1.38 -0.84 -0.46:- .65 2 -0.95 -1.44 -1.99 -2.28 -2.40 -2.42 -2.31 -2.16 - .86 -1.42 -1.00 -0.50 |- .73 3 ;-0.95 -1.47 -1.94 -2.10 -2.28 -2.31 -2.13 -2.00 - .72 -1.37 -0.94 -0.44:,- .64 4 '-0.78 -1.20 -1.67 -1.91 -2.04 -2.09 -1.94 -1.76 - .56 -1.13 -0.75 -0.32 - .43 5 -0.50 -0.85 -1.17 -1.63 -1.73 -1.76 -1.65 -1.43 - .24 -0.88 -0.45 -0.20 - .12 6 -0.25 -0.45 -0.82 -1.13 -1.37 -1.48 -1.26 -1.02 -0.64 -0.50 -0.21 -0.10-0.77 7 -0.15 -0.10 -0.29 -0.48 -0.76 -1.00 -0.81 -0.49 -0.28 -0.16 -0.04 -0.03.j-0.S8 8 -0.01 0.11 0.13 0.15 -0.23 -0.41 -0.22 0.12 0.19 0.06 0.07 0.01 0.00 9 0.15 0.30 0.44 0.70 0.48 0.27 0.33 0.66 0.52 0.21 0.22 0.12 0.37 10 0.23 0.37 0.64 1.07 1.02 0.97 0.99 0.96 0.76 0.30 0.29 0.19 0.65 11 0.31 0.48 0.84 1.28 1.57 1.46 1.38 1.19 0.90 0.95 0.43 0.22! 0.93 ;j Mean. -1.39 -1.07 1 0.55 | 3.51 6.21 9.10 10.24| 10.28 7.96 5.26 2.52 I.7» i The numbers without sign must be added ; those with the sign — must be subtracted. 23 XII. Lat. 69° 59' N. Long. 92° 1' W. Greenw. ARCTIC AMERICA. — BOOTHIA FELIX. Corrections to be applied to the Means of the Hours of Observation to obtain the true Mean Temperatures of the respective Days, Months, and of the Year. — DOVE. Degrees of Reaumur. Hours. Jan. Feb. March. April. May. June. July. Aug. Sept. Oct. Nov. Dec. I Mean. Morn. 1 0.08 0.42 1.61 2.17 2.64 2.38 1.78 1.34 0.56 0.30 0.02 0.12 1.12 2 0.10 0.28 1.85 2.25 2.75 2.55 1.78 1.30 0.62 0.32 0.18 0.13 1.15 3 0.11 0.25 2.10 2.30 2.61 2.45 1.65 1.17 0.66 0.33 0.29 0.10 1.12 4 0.11 0.21 2.30 2.26 2.23 2.05 1.35 1.02 0.66 0.34 0.31 0.06 1.02 5 0.10 0.22 2.38 2.02 1.76 1.39 0.99 0.86 0.56 0.32 0.24 0.02 0.87 6 0.10 0.26 2.23 1.53 1.02 0.65 0.61 0.70 0.46 0.27 0.13 -0.04 0.64 1 7 0.09 0.29 1.77 0.81 0.35 -0.04 0.26 0.50 0.27 0.17 0.02 -0.07 0.371 8 0.08 0.22 0.98 -0.06 -0.32 -0.58 -0.03 0.24 0.05 0.01 0.01 -0.10 0.04 9 0.06 0.05 -0.06 -0.98 -0.95 -0.99 -0.37 -0.10 -0.12 -0.20 -0.04 -0.10 -0.32 10 0.02 -0.26 -1.22 -1.81 -1.54 -1.33 -0.70 -0.49 -0.43 -0.41 -0.14 -0.10 -0.70 11 -0.02 -0.58 -2.28 -2.45 -2.06 -1.66 -1.05 -0.86 -0.65 -0.59 -0.26 -0.11 -1.05 Noon. . . -0.05 -0.87 -3.05 -2.86 -2.46 -2.02 -1.43 -1.16 -0.82 -0.69 -0.32 -0.12 -1.32 1 -0.11 -1.02 -3.38 -3.03 -2.66 -2.33 -1.70 -1.34 -0.93 -0.68 -0.30 -0.14 -1.47 2 -0.14 -0.98 -3.26 -2.96 -2.65 -2.48 -1.86 -1.38 -0.94 -0.57 -0.19 -0.13 -1.46 3 -0.15 -0.78 -2.78 -2.67 -2.40 -2.38 -1.78 -1.32 -0.93 -0.38 -0.04 -0.10 -1.31 4 -0.14 -0.46 -2.06 -2.18 -1.98 -1.98 -1.56 -1.18 -0.68 -0.18 0.06 -0.05 -1.03 5 -0.11 -0.14 -1.29 -1.50 -1.45 -1.36 -1.18 -1.01 -0.44 0.01 0.24 0.01 -0.69 6 -0.09 0.13 -0.57 -0.74 -0.88 -0.66 -0.78 -0.78 -0.17 0.14 0.31 0.07 -0.34 7 -0.06 0.32 0.01 0.06 -0.34 -0.01 -0.34 -0.50 0.08 0.22 0.36 0.10 -0.01 8 -0.05 0.43 0.44 0.78 0.20 0.51 0.07 -0.16 0.26 0.25 0.38 0.11 0.27 9 -0.03 0.50 0.76 1.35 0.74 0.92 0.50 0.24 0.38 0.26 0.38 0.10 0.51 10 -0.02 0.51 0.99 1.74 1.28 1.26 0.90 0.66 0.44 0.26 0.35 0.10 0.71 - 11 0.02 0.52 1.19 1.95 1.82 1.63 1.20 1.01 0.48 0.26 0.28 0.09 087| Midn. . . 0.05 0.49 1.38 2.08 2.30 2.04 1.59 1.25 0.51 0.28 0.15 0.12 1.02 6. 6 0.01 0.20 0.83 0.40 0.07 -0.01 -0.09 -0.04 0.15 0.21 0.09 0.02 0.15 7. 7 0.02 0.31 0.89 0.44 0.01 -0.03 -0.04 -0.00 0.18 0.20 0.17 0.02 0.18 8. 8 0.02 0.33 0.71 0.36 -0.06 -0.04 0.02 0.04 0.16 0.13 0.20 0.01 0.16 9. 9 0.02 0.28 0.35 0.19 -0.11 -0.04 0.07 0.07 0.13 0.03 0.17 -0.00 0.10 10.10 -0.00 0.13 -0.12 -0.04 -0.13 -0.04 0.10 0.09 0.01 -0.08 0.11 -0.00 0.00 7. 2. 9 -0.03 -0.06 -0.24 -0.27 -0.52 -0.53 -0.37 -0.21 -0.10 -0.05 0.06 -0.03 -0.20 6. 2. 8 -0.03 -0.10 -0.20 -0.22 -0.48 -0.44 -0.39 -0.28 -0.07 -0.02 0.02 -0.02 -0.19 6. 2.10 -0.02 -0.07 -0.01 0.10 -0.12 -0.19 -0.12 -0.01 -0.01 -0.01 0.01 -0.02 -0.04 fi. 2. 6 -0.04 -0.20 -0.53 -0.72 -0.84 -0.83 -0.68 -0.49 -0.22 -0.05 -0.00 -0.03 -0.39 7. 2 -0.03 -0.35 -0.75 -1.08 -1.15 -1.26 -0.80 -0.44 -0.34 -0.20 -0.11 -0.10 -0.55 8. 2 -0.03 -0.38 -1.14 -1.51 -1.49 -1.53 -0.95. -0.57 -0.45 -0.28 -0.09 -0.12 -0.71 8. 1 -0.02 -0.40 -1.20 -1.55 -1.49 -1.46 -0.87 -0.55 -0.44 -0.34 -0.15 -0.12 -0.72 7. 1 -0.01 -0.37 -0.81 -1.11 -1.16 -1.19 -0.72 -0.42 -0.33 -0.26 -0.16 -0.11 -0.55 9.12.3.9 -0.04 -0.28 -1.28 -1.29 -1.27 -1.12 -0.77 -0.59 -0.37 -0.25 -0.01 -0.06 -0.61 7. 2.2(9) -0.03 0.08 0.01 0.14 -0.21 -0.17 -0.15 -0.10 0.02 0.03 0.14 -0.00 -0.02 Dail.ext. -0.02 -0.25 -0.50 -0.37 0.05 0.04 -0.04 -0.02 -0.14 -0.18 0.03 -0.01 -0.16 The numbers without sign must be added ; those with the sign — must be subtracted. 24 XIII. N. AMERICA. — LAKE ATHABASCA. Lat. 59° N. Long. 111° W. Greenw. Corrections to be applied to the Means of the Hours of Observation to obtain the true Mean Temperatures of the respective Days, Months, and of the Year. — LEFROY. The corrections for April and May are derived from observations made at Fort Simpson, Lat. 62o N. Degrees of Fahrenheit. Hour. April. May. October. November. December. January. February. daily ext. 1.58 1.71 0.33 0.25 -0.17 0.77 1.19 6, 6 1.15 0.51 1.07 0.59 0.27 0.84 1.19 7,7 1.50 0.16 0.76 0.54 0.30 0.58 1.31 8,8 1.72 0.18 0.69 0.55 0.62 0.95 1.27 9,9 0.54 0.30 0.37 0.32 0.84 0.80 0.78 10, 10 -0.43 -0.08 -0.32 -0.06 0.34 0.12 0.31 11, 11 -1.68 -1.20 -0.57 -0.37 0.10 -0.62 -0.23 6, 2, 10 0.47 0.46 -0.31 -0.21 -0.22 -0.17 -0.05 7, 3, 11 0.46 0.59 -0.40 1 -0.16 0 17 0.06 -0.26 Mean. 32.48 44.56 21.44 9.76 0.40 -23.00 4.79 XIV. ARCTIC AMERICA. -MELVILLE ISLAND. Lat. 74° 47' N. Long. 110° 48' W. Gr.— DOVE. Degrees of Reaumur. Hour. January. February. March. October. Hour. November. December. A.M. 1 0.12 0.10 1.04 0.04 A.M. 2 -0.12 -0.09 3 0.18 0.05 1.22 0.12 4 -0.02 -0.06 5 0.07 0.25 090 0.24 6 0.00 0.11 7 0.11 0.29 0.57 0.20 8 -0.22 0.07 9 -013 -0.24 0.29 -0.15 10 -0.38 0.11 11 -0.35 -0.43 -1.33 -0.46 12 -0.41 0.24 P.M. 1 -0.22 -0.65 -1.72 -0.43 P.M. 2 -0.27 0.14 3 -0.25 -0.52 -1.00 0.22 4 0.16 0.00 5 0.04 0.04 -0.43 -0.24 6 0.27 -0.12 7 0.04 0.24 0.06 -0.10 8 0.38 -0.26 9 0.11 0.35 0.33 0.11 10 0.36 -0.12 11 0.40 0.49 0.66 0.43 12 0.25 0.00 Mean. -29.75 -27.58 -22.73 -14.82 Mean. -18.65 -25.75 XV. SPITZBERGEN. — HECLA COVE. Lat. 79° 55' N. Long. 16° 49' E. Gr. — DOVE. Degrees of Reaumur. Hour. June. July. August. Hour. June. July. August. A.M. 1 0.63 0.62 0.42 P.M. 1 -0.67 -0.67 -0.63 3 0.43 0.84 0.54 3 -0.58 -0.42 -0.58 5 0.26 0.51 0.53 5 -0.27 -0.44 -0.32 7 -0.12 -0.02 0.25 7 0.26 -0.17 -0.06 9 -0.29 -0.09 -0.09 9 0.21 0.06 0.14 11 -0.47 -0.49 -0.45 11 0.61 0.26 0.24 Mean. 1.71 3.63 2.84 The numbers without sign must be added ; those with the sign — must be subtracted. 25 XVI. S. AMERICA. — Rio JANEIRO. Lat. 22° 54' S. Long. 43° 16' W. Greenw. Corrections to be applied to the Means of the Hours of Observation to obtain the true Mean Temperatures of the respective Days, Months, and of the Year. — DOVE. Degrees of Fahrenheit. Hours. Jan. Feb. March. April. May. June. July. Aug. Sept. Oct. Nor. Dec. Mean. Morn. 1 0.74 1.51 1.80 0.90 1.13 0.56 1.85 1.31 1.04 0.97 1.76 1.31 1.24 2 1.64 2.41 2.48 1.64 2.12 1.53 2.75 2.00 1.69 1.64 2.32 2.05 2.03 8 2.50 3.11 3.02 2.32 2.93 2.43 3.47 2.66 2.27 2.21 2.75 2.66 2.70 4 3.08 3.90 3.24 2.79 3.38 3.04 3.87 3.04 2.59 2.50 2.93 2.99 3.06 5 3.22 3.29 3.15 2.90 3.40 3.29 3.83 3.08 2.66 2.52 279 2.99 3.08 6 2.93 2.84 2.75 2.75 3.06 3.20 3.47 2.79 2.41 2.27 2.32 2.68 2.79 7 2.30 2.21 2.14 2.30 2.48 2.84 2.70 2.25 2.00 1.82 1.67 2.12 2.23 8 1.49 1.49 1.40 1.71 1.85 2.39 1.96 1.60 1.46 1.28 0.90 1.40 1.58 9 0.68 0.72 0.59 1.04 1.15 1.82 1.15 0.90 0.86 0.68 0.14 0.59 0.86 10 -0.07 -0.05 -0.23 0.32 0.50 1.13 0.32 0.23 0.18 0.05 -0.56 -0.23 -0.14 11 -0.77 -0.86 -1.01 -0.45 -0.23 0.32 -0.50 -0.50 -0.54 -0.59 -1.22 -1.04 -0.61 Noon. . . -1.40 -1.64 -1.71 -1.22 -0.99 -0.65 -1.31 -1.19 -1.26 -1.22 -1.80 -1.82 -1.35 1 -2.00 -2.30 -2.30 -1.94 -1.71 -1.67 -2.16 -1.91 -1.89 -1.78 -2.32 -2.43 -2.03 2 -2.41 -2.75 -2.66 -2.41 -2.30 -2.48 -2.88 -2.48 -234 -2.16 -2.66 -2.81 -2.52 3 -2.59 -2.88 -2.84 -2.66 -2.66 -2.99 -3.40 -2.84 -2.50 -2.27 -2.79 -2.86 -2.77 4 -2.45 -2.70 -2.77 -2.57 -2.75 -3.04 -3.60 -2.93 -2.36 -2.12 -2.66 -2.59 -2.70 5 -205 -2.30 -2.50 -2.21 -2.54 -2.75 -3.47 -2.68 -2.00 -1.78 -2.25 -2.09 -2.39 6 -1.51 -1.82 -2.12 -1.76 -2.21 -2.23 -3.04 -2.23 -1.55 -1.37 -1.67 -1.49 -1.91 7 -1.04 -1.40 -1.67 -1.28 -1.89 -1.76 -2.39 -1.67 -1.13 -1.04 -1.08 -0.99 -1.44 8 -0.72 -1.13 -1.22 -0.95 -1.67 -1.42 -1.85 -1.13 -0.83 -0.77 -0.59 -0.61 -1.08 9 -0.59 -0.92 -0.77 -0.72 -1.44 -1.26 -1.22 -0.70 -0.61 -0.61 -0.14 -0.38 -0.79 0 -0.56 -0.63 -0.25 -0.52 -1.13 -1.13 -0.59 -0.32 -0.41 -0.45 0.23 -0.16 -0.50 11 -0.41 -0.14 0.36 -0.25 -0.63 -0.86 0.09 0.09 -0.09 -0.16 0.65 0.14 0.09 Midn. . . 0.00 0.59 1.06 0.23 0.14 -0.29 0.92 0.61 0.38 0.32 1.15 0.65 0.47 6. 6 0.72 0.52 0.32 0.50 0.43 0.50 0.30 0.29 0.43 0.45 0.34 0.61 0.45 7. 7 0.63 0.41 0.25 0.52 0.29 0.54 0.16 0.29 0.45 0.41 0.29 0.56 0.41 8. 8 0.38 0.18 0.09 0.38 0.09 0.50 0.07 0.25 0.32 0.27 0.16 0.41 0.25 9. 9 0.05 -0.11 -0.09 -0.16 -0.16 0.29 -0.05 0.11 0.14 0.05 0.00 0.11 0.05 10.10 -0.32 -0.34 -0.25 -0.11 -0.32 0.00 -0.14 -0.05 -0.11 -0.20 -0.18 -0.20 -0.18 7. 2. 9 -0.23 -0.50 -0.43 -0.27 -0.43 -0.29 -0.47 -0.32 -0.32 -0.32 -0.38 -0.36 -0.36 6. 2. 8 -0.07 -0.34 -0.38 -0.20 -0.29 -0.23 -0.43 -0.27 -0.25 -0.23 -0.32 -0.25 -0.27 6. 2.10 -0.02 -0.18 -0.05 -0.07 -0.11 -0.14 0.00 0.00 -0.11 -0.11 -0.05 -0.09 -0.07 6. 2. 6 -0.34 -0.59 -0.68 -0.47 -0.47 -0.50 -0.81 -0.63 -0.50 -0.43 -0.68 -0.54 -0.56 7. 2 -0.07 -0.27 -0.27 -0.07 0.09 0.18 -0.09 -0.11 -0.18 -0.18 -0.50 -0.36 -0.16 8. 2 -0.47 -0.63 -0.63 -0.36 -0.23 -0.05 -0.47 -0.45 -0.45 -0.45 -0.88 -6.72 -0.47 8. 1 -0.27 -0.41 -0.45 -0.11 0.07 0.36 -0.11 -0.16 -0.23 -0.25 -0.72 -0.52 -0.23 7. 1 0.16 -0.05 -0.09 0.18 0.38 059 -0.27 0.18 0-07 0.02 -0.34 -0.16 -0.11 9.12.3.9 -0.97 -1.19 -1.19 -0.90 -0.99 -0 77 -1.19 -0.97 -088 -0.86 -1.15 -1.13 -1.01 7. 2.2(9) -0.32 -0.61 -0.52 -0.38 -0.68 -0.54 -0.65 -0.41 -0.38 -0.38 -0.32 -0.36 -0.47 Dail. ext. 0.32 0.27 0.20 0.14 0.34 0.14 0.14 0.09 0.09 0.14 0.07 0.07 0.16 The numbers without sign must be added ; those with the sign — must be subtracted. 26 XVII. S. AMERICA. — Rio JANEIRO. Lat. 22° 54' S. Long. 43° 16' W. G-reenw. Corrections to be applied to the Means of the Hours of Observation to obtain the true Mean Temperatures of the respective Days, Months, and of the Year. — DOVE. Degrees of Reaumur. Hours. Jan. Feb. March. April. May. June. July. Aug. Sept. Oct. Nor. Dec. Mean. Morn. 1 0.33 0.67 0.80 0.40 0.50 0.25 0.82 0.58 0.46 0.43 0.78 0.58 0.55 2 0.73 1.07 .10 0.73 0.94 0.68 1.22 0.89 0.75 0.73 1.03 0.91 0.90 3 .11 1.38 .34 1.03 1.30 1.08 1.54 1.18 101 0.98 1.22 1.18 1.20 4 .37 1.51 .44 1.24 1.50 1.35 1.72 1.35 1.15 1.11 1.30 1.33 1.36 5 .43 1.46 .40 1.29 1.51 1.46 1.70 1.37 1.18 1.12 1.24 1.33 1.37 6 .30 1.26 .22 1.22 1.36 1.42 1.54 1.24 1.07 1.01 1.03 1.19 1.24 7 .02 0.98 0.95 1.02 1.10 1.26 1.20 1.00 0.89 0.81 0.74 0.94 0.99 8 0.66 0.66 0.62 0.76 0.82 1.06 0.87 0.71 0.65 0.57 0.40 0.62 0.70 9 0.30 0.32 0.26 0.46 0.51 0.81 0.51 0.40 0.38 0.30 0.06 0.26 0.38 10 -0.03 -0.02 -0.10 0.14 0.22 0.50 0.14 0.10 0.08 0.02 -0.25 -0.10 0.06 11 -0.34 -0.38 -0.45 -0.20 -0.10 0.14 -0.22 -0.22 -0.24 -0.26 -0.54 -0.46 -0.27 Noon. . . -0.62 -0.73 -0.76 -0.54 -0.44 -0.29 -0.58 -0.53 -0.56 -0.54 -0.80 -0.81 -0.60 1 -0.89 -1.02 -1.02 -0.86 -0.76 -0.74 -0.96 -0.85 -0.84 -0.79 -1.03 -1.08 -0.90 2 -1.07 -1.22 -1.18 -1.07 -1.02 -1.10 -1.28 -1.10 -1.04 -0.96 -1.18 -1.25 -1.12 3 -1.15 -1.28 -1.26 -1.18 -1.18 -1.33 -1.51 -1.26 -1.11 -1.01 -1.24 -1.27 -1.23 4 -1.09 -1.20 -1.23 -1.14 -1.22 -1.35 -1.60 -1.30 -1.05 -0.94 -1.18 -1.15 -1.20 5 -0.91 -1.02 -1.11 -0.98 -1.13 -1.22 -1.54 -1.19 -0.89 -0.79 -1.00 -0.93 -1.06 6 -0.67 -0.81 -0.94 -0.78 -0.98 -0.99 -1.35 -0.99 -0.69 -0.61 -0.74 -0.66 -0.85 7 -0.46 -0.62 -0.74 -0.57 -0.84 -0.78 -1.06 -0.74 -0.50 -0.46 -0.48 -0.44 -0.64 8 -0.32 -0.50 -0.54 -0.42 -0.74 -0.63 -0.82 -0.50 -0.37 -0.34 -0.26 -0.27 -0.48 9 -0.26 -0.41 -0.34 -0.32 -0.64 -0.56 -0.54 -0.31 -0.27 -0.27 -0.06 -0.17 -0.35 10 -0.25 -0.28 -0.11 -0.23 -0.50 -0-50 -0.26 -0.14 -0.18 -0.20 0.10 -0.07 -0.22 11 -0.18 -0.06 0.16 -0.11 -0.28 -0.38 0.04 -0.04 -0.04 -0.07 0.29 0.06 -0.04 Midn. . . 0.00 0.26 0.47 0.10 0.06 -0.13 0.41 0.27 0.17 0.14 0.51 0.29 0.21 6. 6 0.32 0.23 0.14 0.22 0.19 0.22 0.10 013 0.19 0.20 0.15 027 0.20 7. 7 0.28 0.18 0.11 0.23 0.13 0.24 0.07 0.13 0.20 0.18 0.13 0.25 0.18 8. 8 0.17 0.08 0.04 0.17 0.04 0.22 0.03 0.11 0.14 0.12 0.07 0.18 0.11 9. 9 0.02 -0.05 -0.04 0.07 -0.07 0.13 -0.02 0.05 0.06 0.02 -0.00 0.05 0.02 10.10 -0.14 -0.15 -0.11 -0.05 -0.14 -0.00 -0.06 -0.02 -0.05 -0.09 -0.08 -0.09 -0.08 7. 2. 9 -0.10 -0.22 -0.19 -0.12 -0.19 -0.13 -0.21 -0.14 -0.14 -0.14 -0.17 -0.16 -0.16 6. 2. 8 -0.03 -0.15 -0.17 -0.09 -0.13 -0.10 -0.19 -0.12 -0.11 -0.10 -0.14 -0.11 -0.12 6. 2.10 -0.01 -0.08 -0.02 -0.03 -0.05 -0.06 -0.00 -0.00 -0.05 -0.05 -0.02 -0.04 -0.03 6. 2. 6 -0.15 -0.26 -0.30 -0.21 -0.21 -0.22 -0.36 -0.28 -0.22 -0.19 -0.30 -0.24 -0.25 7. 2 -0.03 -0.12 -0.12 -0.03 0.04 0.08 -0.04 -0.05 -0.08 -0.08 -0.22 -0.16 -0.07 8. 2 -0.21 -0.28 -0.28 -0.16 -0.10 -0.02 -0.21 -020 -0.20 -0.20 -0.39 -0.32 -0.21 8. 1 -0.12 -0.18 -0.20 -0.05 0.03 0.16 -0.05 -0.07 -0.10 -0.11 -0.32 -0.23 -0.10 7. 1 0.07 -0.02 -0.04 008 0.17 0.26 0.12 0.08 0.03 0.01 -0.15 -0.07 0.05 9.12.3.9 -0.43 -0.53 -0.53 -0.40 -0.44 -0.34 -053 -O.J3 -0.39 -0.38 -0.51 -0.50 -0.45 7. 2.2(9) -0.14 -0.27 -0.23 -0.17 -0.30 -0.24 -0.29 -0.18 -0.17 -0.17 -0.14 -0.16 -0.21 Dail.ext. 0.14 0.12 0.09 0.06 0.15 0.06 0.06 0.04 0.04 0.06 0.03 0.03 0.07 E The numbers without sign must be added ; those with the sign — must be subtracted. 27 V. N. AMERICA.— AMHERST COLLEGE. — Lai. 42° 22' N. Long. 72° 30' W. Greenw. Corrections to be applied to the Means of the Hours of Observation to obtain the ti Mean Temperatures of the respective Days, Months, and of the Year. — DEWEY. Degrees of Fahrenheit. Hour. Jan. Feb. March. April. May. June. July. Aug. Sept. Oct. NOT. Dec. Year. Morn. 1 3.90 2.78 4.73 6.23 5.51 6.64 6.39 5.14 5.36 4.87 2.34 1.63 4.63 2 4.24 3.03 4.81 6.69 6.48 7.28 6.83 5.66 6.12 5.65 2.99 2.20 5.16 3 4.13 3.20 5.36 7.42 7.41 7.92 7.28 6.03 6.92 6.46 3.49 2.55 5.68 4 4.50 3.94 5.69 7.85 7.88 8.04 7.42 6.29 6.56 7.09 3.72 2.70 6.06 ! 5 4.72 4.20 6.04 8.12 8.18 7.80 7.54 6.66 7.88 7.72 4.03 3.32 6.35 6 4.68 4.78 6.12 7.77 6.77 5.96 6.02 5.81 7.44 7.65 4.34 3.78 5.93 7 4.75 4.78 4.62 5.97 4.22 4.20 3.80 4.48 5.32 6.87 4.28 3.97 4.77 8 3.83 3.78 2.08 3.04 1.62 1.40 1.09 1.96 2.52 4.31 2.68 4.13 2.70 9 1.46 1.45 -0.46 0.08 -0.60 -0.88 -0.87 -0.93 -0.56 0.83 0.34 2.40 0.19 10 -1.26 -0.85 -2.57 - 2.69 -1.12 -3.12 -3.80 -3.04 -3.32 -2.24 -1.43 -0.55 -2.34 11 -4.10 -2.72 -4.77 - 5.65 -5.12 -5.68 -6.43 -5.45 -6.04 -5.02 -3.01 -2.76 -4.73 Noon. -6.32 -4.26 -6.38 - 7.92 -6.75 -8.08 -8.50 -6.86 -8.16 -7.06 -5.01 -4.30 -6.63 1 -7.46 -5.35 -7.65 - 9.46 -8.15 -9.36 -8.83 -8.23 -9.12 -8.24 -6.12 -6.14 -7.84 2 -7.80 -6.06 -8.34 -10.42 -8.75 -9.00 -9.50 -7.86 -9.80 -9.28 -5.97 -6.30 -8.26 3 -7.32 -5.80 -8.11 - 9.81 -8.27 -8.60 -7.50 -7.67 -9.20 -9.24 -5.28 -5.60 -7.70 4 -5.84 -4.89 -7.23 - 8.61 -7.86 -7.84 -7.17 -6.23 -8.40 -8.24 -3.85 -3.76 -6.66 5 -3.32 -3.10 -5.65 - 7.04 -5.97 -6.00 -5.83 -5.26 -6.44 -5.65 -2.28 -2.03 -4.88 6 -2.06 -1.18 -3.46 - 4.50 -4.08 -4.20 -4.17 -2.82 -3.52 -3.50 -0.85 -0.68 -2.92 7 0.24 -1.05 0.17 - 1.69 -2.38 -1.92 -1.54 -1.44 -1.47 -1.24 -0.64 -0.31 -1.11 8 0.64 -0.43 0.93 0.27 -0.19 0.04 0.98 0.33 0.11 0.13 0.08 0.20 0.26 9 1.50 0.28 1.89 1.77 1.66 1.96 3.05 1.59 1.99 1.16 0.80 0.69 1.53 10 2.01 0.57 3.29 3.31 2.73 3.20 3.79 3.02 3.53 1.90 1.16 1.20 2.48 11 2.42 1.19 4.29 4.23 3.99 4.20 4.24 3.79 4.61 3.24 1.96 1.58 3.31 Midnight. 2.50 1.70 4.85 4.92 4.75 5.48 5.31 4.52 5.34 4.09 2.40 1.98 3.99 3,9,3,9 -0.05 -0.22 -0.08 - 0.13 0.05 0.10 0.49 0.26 -0.21 -0.20 -0.16 -0.01 -0.01 9,9 1.48 0.87 0.72 0.93 0.53 0.54 1.09 0.33 0.72 1.00 0.57 1.55 0.86 10, 10 0.38 -0.14 0.36 0.31 0.81 0.04 0.00 -0.51 0.11 -0.17 -0.13 0.33 0.12 7,2,9 -0.48 -0.33 -0.61 - 0.89 -0.96 -0.95 -0.88 -0.60 -0.83 -0.42 -0.29 -0.55 -0.65 6,2,10 -0.37 -0.24 0.36 - 0.24 0.25 0.05 0.10 0.32 0.39 0.09 -0.16 -0.44 0.01 7, 2, 10 -0.35 -0.04 -0.14 - 0.38 -0.60 -0.53 -0.64 -0.12 -0.32 -0.17 -0.18 -0.38 -0.32 7,2,11 -0.21 -0.03 0.19 - 0.07 -0.18 -0.20 -0.49 0.14 0.04 0.28 0.09 -0.25 -0.07 6,8,2, 4, ) 10, 12 5 -0.09 0.02 0.13 0.00 -0.12 -0.13 -0.08 0.20 0.11 0.07 0.13 0.17 0.03 7,2,2,(9) -0.01 -0.18 0.01 - 0.23 -0.30 -0.22 0.10 -0.05 -0.12 -0.02 -0.02 -0.24 -0.11 Mean. 22.94 28.57 34.81 48.54 56.92 61.60 71.61 67.44 59.80 50.46 34.80 29.28 47.23 The numbers without sign must be added; those with the sign — must be subtracted. The above Table has been derived from one year of hourly observations made at Amherst College, lassachusetts, in 1839, under the direction of Professor Snell, and communicated by Professor Ches- Dewey. It gives the simple differences of the monthly means of each hour from the monthly means of the twenty-four hours which are found in the last line. E 28 HOURLY CORRECTIONS FOR PERIODIC VARIATIONS. ASIA. XVIII. INDIA. — TREVANDRUM. Lat. 8° 31' N. Long. 74° 50' E. Greenw. Corrections to be applied to the Means of the Hours of Observation to obtain the true Mean Temperatures of the respective Days, Months, and of the Year. — DOVE. Degrees of Fahrenheit. Hours. Jan. Feb. March April. May. June. July. Aug. Sept. Oct. Nor. Dec. Mean. Morn. 1 4.41 4.03 3.80 3.85 3.26 2.66 2.41 2.88 2.99 3.06 3.33 4.25 3.42 2 5.13 4.95 4.64 4.46 3.80 3.02 2.75 3.24 3.44 3.44 3.83 4.86 3.96 3 6.03 6.12 5.67 5.15 4.39 3.47 3.17 3.74 3.98 3.92 4.46 5.67 4.66 4 6.95 7.31 6.64 5.74 4.82 3.80 3.58 4.21 4.48 4.34 5.04 6.50 5.29 5 7.56 8.15 7.13 5.81 4.82 3.83 3.76 4.41 4.61 4.46 5.22 6.93 5.56 6 7.34 8.01 6.73 5.11 4.14 3.35 3.49 4.07 4.14 4.01 4.73 6.57 5.15 7 6.01 6.59 5.20 3.53 2.81 2.34 2.68 3.06 3.02 2.88 3.40 5.11 3.89 8 3.56 3.92 2.66 1.22 0.95 0.90 1.35 1.49 1.26 1.13 1.40 2.70 1.87 9 0.41 0.50 -0.47 -1.42 -1.13 -0.74 -0.27 -0.45 -0.81 -0.99 -0.92 -0.29 -0.54 10 -2.84 -2.97 -3.53 -3.89 -3.04 -2.30 -1.91 -2.41 -2.86 -3.06 -3.11 -324 -2.93 11 -5.51 -5.85 -5.94 -5.76 -4.48 -3.53 -3.33 -4.05 -4.50 -4.73 -4.75 -5.58 -4.84 Noon. . . -7.25 -7.58 -7.36 -6.82 -5.33 -4.34 -4.32 -5.18 -5.54 -5.72 -5.67 -7.00 -6.01 1 -7.92 -8.17 -7.72 -7.04 -5.60 -4.68 -4.79 -5.69 -5.87 -5.94 -5.90 -7.49 -6.41 2 -7.76 -7.83 -7.22 -6.59 -5.38 -4.61 -4.77 -5.60 -5.60 -5.54 -5.60 -7.25 -6.14 3 -7.09 -6.98 -6.26 -5.65 -4.79 -4.19 -4.30 -5.04 -4.86 -4.66 -4.95 -6.57 -5.45 4 -6.17 -5.99 -5.06 -4.46 -3.94 -3.47 -3.51 -4.10 -3.80 -3.53 -4.12 -5.67 -4.48 5 -5.1S -4.88 -3.83 -3.11 -2.88 -2.52 -2.52 -2.90 -2.59 -2.32 -3.15 -4.61 -8.38 6 -3.92 -3.74 -2.57 -1.71 -1.69 -1.42 -1.40 -1.58 -1.31 -1.10 -2.03 -3.35 -2.16 7 -2.50 -2.45 -1.31 -0.34 -0.50 -0.32 -0.29 -0.27 -0.11 o.oo -0.81 -1.89 -0.90 8 -0.92 -1.04 -0.07 0.92 0.63 0.70 0.68 0.90 0.92 0.97 0.38 -0.32 0.32 9 0.68 0.38 1.06 1.91 1.53 1.46 1.40 1.76 1.69 1.71 1.42 1.19 1.35 10 2.05 1.64 1.96 2.61 2.16 1.96 1.85 2.30 2.18 2.25 2.21 2.43 2.14 11 3.08 2.57 2.63 3.06 2.57 2.23 2.09 2.54 2.48 2.57 2.68 3.26 2.66 Midn. . . 3.83 3.31 3.17 3.42 2.88 2.41 2.23 2.68 2.70 2.81 2.99 3.80 3.02 6. 6 1.71 2.14 2.09 1.71 1.24 0.97 1.04 1.24 1.42 1.46 1.35 1.60 1.51 7. 7 1.76 2.07 1.96 1.60 1.17 1.01 1.19 1.40 1.44 1.44 1.28 1.62 1.49 8. 8 1.33 1.44 1.31 1.06 0.79 0.79 1.01 1.19 1.08 1.06 0.88 1.19 1.10 9. 9 0.54 0.43 0.29 0.25 0.20 0.36 0.56 0.65 0.43 0.36 0.25 0.45 0.41 10.10 -0.41 -0.65 -0.79 -0.63 -0.45 -0.18 -0.02 -0.07 -0.34 -0.41 -0.45 -0.40 -0.41 7. 2. 9 -0.36 -0.29 -0.32 -0.38 -0.34 -0.27 -0.23 -0.27 -0.29 -0.32 -0.27 -0.32 -0.32 6. 2. 8 -0.45 -0.29 -0.18 -0.18 -0.20 -0.18 -0.20 -0.20 -0.18 -0.18 -0.16 -0.34 -0.23 6. 2.10 0.54 0.61 0.50 0.38 0.32 0.23 0.18 0.25 0.25 0.25 0.45 0.59 0.38 6. 2. 6 -1.44 -1.19 -1.01 -1.06 -0.97 -0.90 -0.90 -1.04 -0.92 -0.88 -0.97 -1.35 -1.06 7. 2 -0.88 -0.63 -1.01 -1.53 -1.28 -1.15 -1.06 -1.28 -1.31 -1.33 -1.10 -1.08 -1.13 8. 2 -2.12 -1.96 -2.30 -2.70 -2.23 -1.87 -1.71 -2.07 -2.18 -2.21 -2.12 -2.27 -2.14 8. 1 -2.18 -2.14 -2.54 -2.93 -2.34 -1.89 -1.73 -2.12 -2.32 -2.41 -2.25 -2.41 -2.27 7. 1 -0.97 -0.79 -1.26 -1.76 -1.40 -1.17 -1.06 -1.33 -1.44 -1.53 -1.26 -1.19 -1.26 9.12.3.9 -3.31 -3.42 -3.26 -2.99 -2.43 -1.96 -1.87 -2.23 -2.39 -2.41 -2.54 -3.17 -2.66 7. 2.2(9) -0.11 -0.11 0.02 0.20 0.14 0.16 0.18 0.25 0.20 0.20 0.16 0.07 0.11 The numbers without sign must be added ; those with the sign — must be subtracted. XIX. INDIA. — TREVANDRUM. Lot. 8° 31' N. Long. 74° 50' E. Greenw. Corrections to be applied to the Means of the Hours of Observation to obtain the true Mean Temperatures of the respective Days, Months, and of the Year. — DOVE. Degrees of Reaumur. Hours. Jan. Feb. March April May. June. July. Aug. Sept. Oct. Nov. Dec. Mean. Morn. 1 1.96 1.79 1.G9 1.71 1.45 1.18 1.07 1.28 1.33 1.36 1.48 1.89 1.52 2 2.28 2.20 2.06 1.98 1.69 1.34 1.22 1.44 1.53 1.53 1.70 2.16 1.76 3 2.68 2.72 2.52 2.29 1.95 1.54 1.41 1.66 1.77 1.74 1.98 2.52 2.07 4 3.09 3.25 2.95 2.55 2.14 1.69 1.59 1.87 1.90 1.93 2.24 2.89 2.35 5 3.36 3.62 3.17 2.58 2.14 1.70 1.67 1.96 2.05 1.98 2.32 3.08 2.47 6 3.26 3.56 2.99 2.27 1.85 1.49 1.55 1.81 1.84 1.78 2.10 2.92 2.29 7 2.67 2.93 2.31 1.57 1.25 1.04 1.19 1.36 1.34 1.28 1.51 2.27 1.73 8 1.58 1.74 1.18 0.54 0.42 0.40 0.60 0.66 0.56 0.50 0.62 1.20 0.83 9 0.18 0.22 -0.21 -0.63 -0.50 -0.33 -0.12 -0.20 -0.36 -0.44 -0.41 -013 -0.24 10 -1.26 -1.32 -1.57 -1.73 -1.35 -1.02 -0.85 -1.07 -1.27 -1.36 -1.38 -1.44 -1.30 11 -2.45 -2.60 -2.64 -2.56 -1.99 -1.57 -1.48 -1.80 -2.00 -2.10 -2.11 -2.48 -2.15 Noon. . . -3.22 -3.37 -3.27 -3.03 -2.37 -1.93 -1.92 -2.30 -2.46 -2.54 -2.52 -3.11 -2.67 1 -3.52 -3.63 -3.43 -3.13 -2.49 -2.08 -2.13 -2.53 -2.61 -2.64 -2.62 -3.33 -2.85 2 -3.45 -3.48 -3.21 -2.93 -2.39 -2.05 -2.12 -2.49 -2.49 -2.46 -2.49 -3.22 -2.73 3 -3.15 -3.10 -2.78 -2.51 -2.13 -1.86 -1.91 -2.24 -2.16 -2.07 -2.20 -2.92 -2.42 4 -2.74 -2.66 -2.25 -1.98 -1.75 -1.54 -156 -1.82 -1.69 -1.57 -1.83 -2.52 -1.99 5 -2.28 -2.17 -1.70 -1.38 -1.28 -1.12 -1.12 -1.29 -1.15 -1.03 -1.40 -2.05 -1.50 6 -1.74 -1.66 -1.14 -0.76 -0.75 -0.63 -0.62 -0.70 -0.58 -0.49 -0.90 -1.49 -0.96 7 -1.11 -1.09 -0.58 -0.15 -0.22 -0.14 -0.13 -0.12 -0.05 0.00 -0.36 -0.84 -0.40 8 -0.41 -0.46 -0.03 0.41 0.28 0.31 0.30 0.40 0.41 0.43 0.17 -0.14 0.14 9 0.30 0.17 0.47 0.85 0.68 0.65 0.62 0.78 0.75 0.76 0.63 0.53 0.60 10 0.91 073 0.87 1.16 0.96 0.87 0.82 1.02 0.97 1.00 0.98 1.08 0.95 11 1.37 1.14 1.17 1.36 1.14 0.99 0.93 1.13 1.10 1.14 1.19 1.45 1.18 Midn. . . 1.70 1.47 1.41 1.52 1.28 1.07 0.99 1.19 1.20 1.25 1.33 1.69 1.34 6. 6 0.76 0.95 0.93 0.76 0.55 0.43 0.46 0.55 0.63 0.65 0.60 0.71 0.67 7. 7 0.78 092 0.87 0.71 0.52 0.45 0.53 0.62 064 0.64 0.57 0.72 0.66 8. 8 0.59 0.64 0.58 0.47 0.35 0.35 0.45 0.53 0.48 0.47 0.39 0.53 0.49 9. 9 0.24 0.19 0.13 0.11 0.09 0.16 0.25 0.29 0.19 0.16 0.11 0.20 0.18 10.10 -0.18 -0.29 -0.35 -0.28 -0.20 -0.08 -0.01 -0.03 -0.15 -0.18 -0.20 -0.18 -0.18 7. 2. 9 -0.16 -0.13 -0.14 -0.17 -0.15 -0.12 -0.10 -0.12 -0.13 ^0.14 -0.12 -0.14 -0.14 6. 2. 8 -0.20 -0.13 -0.08 -0.08 -0.09 -0.08 -0.09 -0.09 -0.08 -0.08 -0.07 -0.15 -0.10 6. 2.10 024 0.27 0.22 0.17 0.14 0.10 0.08 0.11 0.11 0.11 0.20 0.26 0.17 6. 2. 6 -0.64 -0.53 -0.45 -0.47 -0.43 -0.40 -0.40 -0.46 -0.41 -0.39 -0.43 -0.60 -0.47 7. 2 -0.39 -0.28 -0.45 -0.68 -0.57 -0.51 -0.47 -0.57 -0.58 -0.59 -0.49 -0.48 -0.50 8. 2 -0.94 -0.87 -1.02 -1.20 -0.99 -0.83 -0.76 -0.92 -0.97 -0.98 -0.94 -1.01 -0.95 8. 1 -0.97 -0.95 -1.13 -1.30 -1.04 -0.84 -0.77 -0.94 -1.03 -1.07 -1.00 -1.07 -1.01 7. 1 -0.43 -0.35 -0.56 -0.78 -0.62 -0.52 -0.47 -0.59 -0.64 -0.68 -0.56 -0.53 -0.56 9.12.3.9 -1.47 -1.52 -1.45 -1.33 -1.08 -0.87 -0.83 -0.99 -1.06 -1.07 -1.13 -1.41 -1.18 7. 2.2(9) -0.05 -0.05 0.01 0.09 0.06 0.07 0.08 0.11 0.09 0.09 0.07 0.03 0.05 DaiLext. -0.08 -0.01 -0.13 -0.28 -0.18 -0.19 -0.23 -0.29 -0.28 -0.33 -0.15 -0.13 -0.19 E The numbers without sign must be added ; those with the sign — must be subtracted. 32 XX. INDIA. — MADRAS. Lat. 13° 4' N. Long. 80° 19' E. Greenw. Corrections to be applied to the Means of the Hours of Observation to obtain the true Mean Temperatures of the respective Days, Months, and of the Year. — DOVE. Degrees of Fahrenheit. •• Hour. Jan. Feb. March. April. May. June. July. Aug. Sept. Oct. Nov. Dec. Year. Midnight. 2.05 2.54 2.25 3.65 2.74 3.03 2.90 2.86 2.34 1.84 2.05 1.89 2.50 1 2.54 3.26 2.90 3.08 3.31 3.50 3.10 3.01 2.70 2.27 2.54 2.25 2.87 2 2.96 3.95 3.60 3.57 3.72 3.86 3.55 3.39 3.10 2.79 3.03 2.63 3 35 3 3.33 4.52 4.25 4.07 4.07 4.27 3.93 3.69 3.55 3.12 3.50 2.96 3.77 4 3.62 5.06 4.79 4.40 4.45 4.68 4.31 3.98 3.95 3.46 3.91 3.19 4.15 5 3.81 5.49 5.24 4.45 4.68 4.95 4.66 4.34 4.23 3.71 4.23 3.60 4.45 6 4.05 5.64 5.11 3.78 3.86 4.21 4.31 4.07 3.82 3.28 4.05 3.73 4.16 7 2.43 3.33 2.54 1.78 2.07 2.51 2.92 2.79 2.43 1.80 2.00 2.38 2.41 8 ' -0.04 0.29 0.16 -0.18 -0.11 0.38 1.06 0.99 0.72 0.13 -0.56 0.00 0.23 9 -2.02 -1.93 -1.89 -2.41 -2.43 -1.73 -0.76 -0.90 -1.12 -1.26 -2.49 -1.73 -1.72 10 -3.26 -3.60 -3.67 -4.14 -4.68 -3.67 -2.67 -2.74 -2.96 -2.34 -3.53 -3.05 -336 11 -4.02 -4.81 -4.81 -4.83 -5.75 -5.02 -4.25 -4.16 -4.54 -3.17 -4.09 -3.62 -4.42 Noon. -4.43 -5.06 -5.35 -5.66 -5.87 -5.85 -5.51 -5.28 -5.04 -3.76 -4.31 -3.93 -5.01 1 -4.40 -5.35 -5.42 -5.53 -5.64 -6.05 -6.07 -5.75 -5.04 -3.73 -4.25 -3.86 -5.09 2 -4.14 -5.30 -4.99 -4.95 -4.99 -5.69 -6.02 -5.40 -4.66 -3.55 -3.73 -3.60 -4.75 3 -3.46 -4.85 -4.27 -4.07 -4.00 -4.61 -4.92 -4.59 -3.73 -3.03 -3.05 -2.88 -3.95 4 -2.41 -3.64 -3.10 -2.65 -2.45 -3.57 -3.73 -3.44 -2.56 -2.38 -1.98 -2.04 -2.83 5 -1.19 -2.27 -1.66 -1.03 -1.01 -1.91 -2.18 -1.84 -1.44 -1.26 -0.88 -1.01 -1.47 6 -0.38 -1.10 -0.52 0.20 0.11 -0.58 -0.81 -0.70 -0.52 -0.63 -0.25 -0.38 -0.46 7 0.09 -0.36 0.17 0.83 0.76 0.36 0.16 0.13 0.07 -0.18 0.09 0.00 0.18 8 0.54 0.27 0.58 0.99 1.19 0.97 0.83 0.74 0.47 0.16 0.47 0.34 0.63 9 0.94 0.81 0.97 1.57 1.57 1.42 1.35 1.17 0.99 0.49 0.74 0.67 1.06 10 1.39 1.33 1.39 1.89 1.96 2.11 1.87 1.64 1.39 0.90 1.08 1.03 1.50 11 1.84 1.87 1.84 2.25 2.34 2.41 2.29 2.14 1.89 1.28 1.46 1.44 1.92 6, 6 1.83 2.27 2.29 1.99 1.98 1.81 1.75 1.65 1.65 1.32 1.90 1.67 1.84 7, 7 1.26 1.4S 1.35 1.30 1.41 1.43 1.54 1.46 1.25 0.81 1.04 1.19 1.29 8, 8 0.25 0.28 0.37 0.40 0.54 0.67 0.94 0.81 0.59 0.14 -0.04 0.17 0.43 9,9 -0.54 -0.56 -0.46 -0.42 -0.43 -0.15 0.29 0.13 -0.06 -0.38 -0.87 -0.53 -0.33 10, JO -0.93 -1.13 -1.14 -1.12 -1.36 -0.78 -0.40 -0.55 -0.78 -0.70 -1.22 -1.01 -0.93 7, 1 -0.98 -1.01 -1.44 -1.87 -1.78 -1.77 -1.57 -1.48 -1.30 -0.86 -1.12 -0.74 -1.33 7,2,9 -0.26 -0.39 -0.49 -0.53 -0.45 -0.59 -0.58 -0.48 -0.41 -0.42 -0.33 -0.18 -0.43 6, 2, 10 0.43 0.56 0.50 0.24 0.28 0.21 0.05 0.10 0.18 0.21 0.47 0.39 0.30 Mean. ! 76.77 78.25 82.24 85.73 87.10 87.01 86.22 84.51 83.50 81.18 78.53 76.75 E The numbers •without sign must be added ; those with the sigu 33 must be subtracted. XXI. Lat. 13° 4' N. Long. 80° 19' E. Greenw. INDIA. — MADRAS. Corrections to be applied to the Means of the Hours of Observation to obtain the true Mean Temperatures of the respective Days, Months, and of the Year. — DOVE. Degrees of Reaumur. Hours. Jan. Feb. March April. May. June. July. Aug. Sept. Oct. Nov. Dec. Mean. Morn. 1 1.41 1.22 .32 1.06 1.26 1.15 0.93 0.83 1.26 1.18 1.04 1.38 1.17 2 1.79 1.64 .42 1.36 1.59 1.42 1.09 1.40 .52 1.46 1.32 1.50 .46 3 2.14 2.10 .50 1.76 1.94 1.70 1.26 1.66 .67 1.70 1.70 1.68 .73 4 2.38 2.42 .53 2.10 2.17 1.90 1.42 1.66 .70 1.88 1.90 1.93 .92 5 2.42 2.43 .61 2.20 2.18 1.95 1.42 1.45 .62 1.88 2.02 2.17 .95 6 2.22 2.05 .48 1.91 1.86 1.77 1.33 1.10 .39 1.64 1.81 2.25 .73 7 1.76 1.30 .14 1.24 1.19 1.30 1.12 0.75 .02 1.14 1.27 2.00 .27 8 1.05 0.36 0.54 0.30 0.27 0.70 0.78 0.46 0.47 0.40 0.50 1.32 0.60 9 0.15 -0.59 -0.23 -0.71 -0.75 -0.06 0.35 0.16 -0.23 -0.46 -0.35 0.27 -0.20 10 -0.82 -1.38 -1.04 -1.56 -1.67 -0.82 -0.21 -0.18 -1.02 -1.26 -1.10 -0.94 -1.00 11 -1.74 -1.94 -1.70 -2.12 -2.31 -1.46 -0.86 -0.62 -1.77 -1.83 -1.75 -2.20 -1.69 Noon. . . -2.48 -2.23 -2.06 -2.36 -2.58 -1.94 -1.52 -1.12 -2.29 -2.18 -2.12 -2.76 -2.14 1 -2.90 -2.34 -2.10 -2.34 -2.48 -2.20 -2.13 -1.57 -2.47 -2.17 -2.25 -2.98 -2.33 2 -2.97 -2.30 -1.88 -2.14 -2.13 -2.24 -2.47 -1.82 -2.27 -1.91 -2.18 -2.76 -2.26 3 -2.68 -2.12 -1.52 -1.84 -1.62 -2.07 -2.48 -1.77 -1.77 -1.50 -1.98 -2.25 -1.97 4 -2.14 -1.81 -1.14 -1.46 -1.11 -1.74 -2.12 -1.43 -1.12 -1.08 -1.61 -1.65 -1.53 5 -1.47 -1.34 -0.83 -1.00 -0.65 -1.28 -1.44 -0.94 -0.50 -0.70 -1.10 -1.13 -1 .03 6 -0.81 -0.78 -0.58 -0.48 -0.27 -0.78 -0.65 -0.46 -0.06 -0.38 -0.58 -0.72 -0.55 7 -0.26 -0.18 -0.35 0.04 0.02 -0.30 0.08 -0.14 0.18 -0.14 -0.14 -0.39 -0.13 8 0.13 0.30 -0.08 0.49 0.26 0.12 0.62 -0.04 0.27 0.06 0.36 -0.06 0.20 9 0.38 0.62 0.42 0.71 0.45 0.42 0.86 -0.06 0.33 0.26 0.64 0.30 0.44 10 0.58 0.77 0.60 0.90 0.61 0.63 0.91 -0.06 0.44 0.46 0.81 0.66 0.61 11 0.79 0.84 0.91 0.91 0.78 0.79 0.87 0.11 0.66 0.67 0.83 0.99 0.76 Midn. . . 1.06 0.96 1.16 0.92 0.98 0.94 0.84 0.47 0.95 0.91 0.89 1.22 0.94 6. 6 0.71 0.64 0.45 0.72 0.80 0.50 0.34 0.32 0.67 0.63 0.62 0.77 0.60 7. 7 0.75 0.56 0.40 0.64 0.61 0.50 0.60 0.31 0.60 0.50 0.57 0.81 0.57 8. 8 0.59 0.33 0.23 0.40 0.27 0.41 0.70 0.21 0.37 0.23 0.43 0.63 040 9. 9 0.27 0.02 0.10 -0.00 -0.15 0.18 0.61 0.05 0.05 -0.10 0.15 0.29 0.12 10.10 -0.12 -0.31 -0.22 -0.33 -0.53 -0.10 -0.35 -0.12 -0.29 -0.40 -0.15 -0.14 -0.20 7. 2. 9 -0.28 -0.13 -0-11 -0.06 -0.16 -0.17 -0.16 -0.38 -0.31 -0.17 -0.09 -0.15 -0.18 6. 2. 8 -0.21 0.02 -0.16 0.09 -0.00 -0.12 -0.17 -0.25 -0.20 -0.07 -0.01 -0.19 -0.11 6. 2.10 -0.06 0.17 0.07 0.22 0.11 0.05 -0.08 -0.26 -0.15 0.06 0.15 0.05 0.03 6. 2. 6 -0.52 -0.34 -0.33 -0.24 -0.18 -0.42 -0.60 -0.39 -0.31 -0.22 -0.32 -0.41 -0.36 7. 2 -0.61 -0.50 -0.37 -0.45 -0.47 -0.47 -0.68 -0.54 -0.63 -0.32 -0.46 -0.38 -0.50 8. 2 -0.96 -0.97 -0.67 -0.92 -0.93 -0.77 -0.85 -0.68 -0.90 -0.76 -0.84 -0.72 -0.83 8. 1 -0.93 -0.99 -0.78 -1.02 -1.11 -0.75 -0.68 -0.56 -1.00 -0.89 -0.88 -0.83 -0.87 7. 1 -0.57 -0.52 -0.48 -0.55 -0.65 -0.45 -0.51 -0.41 -0.73 -0.52 -0.49 -0.49 -053 9.12.3.9 -1.16 -1-08 -0.85 -1.05 -1.13 -0.01 -0.70 -0.70 -0.99 -0.97 -0.95 -1.11 -0.97 7. 2.2(9) -0.11 0.06 0.03 0.13 -0.01 -0.03 0.09 -0.30 -0.15 -0.06 0.09 -0.04 -0.03 Dail.ext. -0.28 0.05 -0.25 -0.08 -0.20 -0.15 -0.53 -0.08 -0.39 -0.15 -0.12 -0.37 -0.19 E The numbers without sign must be » cos (L + i <£) I" / 7i\ / 7»\ 2T — iI3v|-r-J + (- rJ sin (4>-r-£) cos \a.+bj \a + &/J + i [3 • (°-^!)' + (^j)l sin (S H- i *) cos [5 L + (2 «, + £ 0)] 90 [—etc.; in which a = J great axis of the globe ; I = £ small axis ; L = the latitude of the lower limit of a quadrilateral surface ; L' = the latitude of the upper limit of the same ; <£ = L' — L ; S = the area of a quadrilateral surface of one degree in lon- gitude ; TT = the ratio of the circumference to the diameter. Substituting the numerical values, the quarter of the meridian being = 10,000,724 legal metres ; the ^ great axis, or «, = 6,376,989 metres ; the £ small axis, or J, — 6,356,323 metres ; the ratio of the axis ^i.^* 5 an^ making ^ = 1° nonagesimal, the formula becomes, 224.996360 cos ( L + 0° 30') — 0.730851 cos (3 L + 1° 30') S= •{ + 0.001784 cos (5 L + 2° 30') — 0.000004 cos (7 L + 3° 30') + etc. The first three terms of the formula give the results with sufficient accuracy. In order to avoid too large a number of figures, the results are given in square miles, the linear base of which is a mile equal to T^ of the mean degree of the meridian. That mile is thus = ( 90 x f5 ) = 7407.942 metres. In order to con- vert the results into new geographical miles, of which 60 = 1°, multiply by 16, log = 1.2041200 ; into common French leagues, 25 = 1°, multiply by 2.777778, log = 0.4436975 ; into nautical leagues, 20= 1°, multiply by 1.777778, log = 0.2498775 ; into English statute miles, 69.163 = 1°, by 21.711034, log = 1.3366868. USE OF THE TABLES. Table L, which gives the number of square miles contained in the quadrilateral surfaces of one degree in latitude and longitude, successively from the equator to the pole, will be more frequently used. Table II. has been computed for maps on a smaller scale ; and Tables III. and IV. for maps of very small scale, covering large areas, in which surfaces of one degree could not be estimated with sufficient accuracy. If the scale is large enough to have the minutes traced on, then Table V. is to be used. For computing a surface by Table I., which may serve as an example for all the others, find first the lowest parallel circle which crosses, on the map, the surface to be estimated; suppose it is 40° lat. N., and the zone within 40° and 41° lat. N. contains four integral degrees of longitude, that is, four surfaces of one degree each way ; then in the first column of the table, on the line beginning with latitude 40°, and in the vertical column headed 4, take the value of these four surfaces, viz. 685.88. Then take likewise the value of the number of surfaces between 41° and 42° lat. N., artd so on. The fractional parts left outside of the integral degrees are best estimated, with the compass, in decimals, the values of which can be found in the columns of the multiples, by properly moving the decimal point to the left. Having taken them in that way, and summing them up with all the integral surfaces, we ob- tain the total surface required. F 11 VI. TABLES FOR COMPUTING SURFACES TABLE I. QUADRILATERAL SURFACES or 1 DEGREE IN LATITUDE AND IN LONGITUDE ON THE TERRESTRIAL ELLIPSOID. Limiting LATITUDES. Multiples of these Quadrilateral Surfaces from 1 to 9. Inf. Sup. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0 1 224.259 448.52 672.78 897.04 1121.29 1345.55 1569.81 1794.07 2018.33 1 2 224.192 448.38 672.58 896.77 1120.96 1345.15 1569.35 1793.54 2017.73 2 3 224.059 448.12 672.18 896.24 1120.30 1344.36 1568.42 1792.47 2016.53 3 4 223.860 447.72 671.58 895.44 1119.30 1343.16 1567.02 1790.88 2014.74 4 5 223.594 447.19 670.78 894.37 1117.97 1341.56 1565.16 1788.75 2012.34 5 6 223.261 446.52 669.78 893.05 1116.31 1339.57 1562.83 1786.09 2009.35 6 7 222.863 445.73 668.59 891.45 1114.31 1337.18 1560.04 1782.90 2005.76 7 8 222.398 444.80 667.19 889.59 1111.99 1334.39 1556.78 1779.18 2001.58 8 9 221.867 443.73 665.60 887.47 1109.33 1331.20 1553.07 1774.93 1996.80 9 10 221.270 442.54 663.81 885.08 1106.35 1327.62 1548.89 1770.16 1991.43 10 11 220.607 441.21 661.82 882.43 1103.03 1323.64 1544.25 1764.85 1985.46 11 12 219.878 439.76 659.63 879.51 1099.39 1319.27 1539.15 1759.02 1978.90 12 13 219.084 433.17 657.25 876.34 1095.42 1314.50 1533.59 1752.67 1971.76 13 14 218.225 436.45 654.67 872.90 1091.12 1309.35 1527.57 1745.80 1964.02 14 15 217.300 434.60 651.90 869.20 1086.50 1303.80 1521.10 1738.40 1955.70 15 16 216.311 432.62 648.93 865.24 1081.55 1297.86 1514.17 1730.48 1946.80 16 17 215.257 430.51 645.77 861.03 1076.28 1291.54 1506.80 1722.05 1937.31 17 18 214.138 428.28 642.41 856.55 1070.69 1284.83 1498.97 1713.10 1927.24 18 19 212.955 425.91 638.87 851.82 1064.78 1277.73 1490.69 1703.64 1916.60 19 20 211.709 423.42 636.13 846.84 1058.54 1270.25 1481.96 1693.67 1905.38 20 21 210.399 420.80 631.20 841.59 1051.99 1262.39 1472.79 1683.19 1893.59 21 22 209.025 418.05 627.08 836.10 1045.13 1254.15 1463.18 1672.20 1881.23 22 23 207.589 415.18 622.77 830.36 1037.95 1245.54 1453.12 1660.71 1868.30 23 24 206.090 412.18 618.27 824.36 1030.45 1236.54 1442.63 1648.72 1854.81 24 25 204.529 409.06 613.59 818.12 1022.65 1227.18 1431.71 1636.24 1840.76 25 26 202.907 405.81 608.72 811.63 1014.53 1217.44 1420.35 1623.25 1826.16 26 27 201.223 402.45 603.67 804.89 1006.11 1207.34 1408.56 1609.78 1811.00 27 28 199.477 398.95 598.43 797.91 997.39 1196.86 1396.34 1595.82 1795.30 28 29 197.672 395.34 593.02 790.69 988.36 1186.03 1383.70 1581.38 1779.05 29 30 195.806 391.61 587.42 783.23 979.03 1174.84 1370.64 1566.45 1762.26 30 31 193.881 387.76 581.64 775.52 969.40 1163.29 1357.17 1551.05 1744.93 31 32 191.897 383.79 575.69 767.59 959.48 1151.38 1343.28 1535.17 1727.07 32 33 189.854 379.71 569.56 759.41 949.27 1139.12 1328.98 1518.83 1708.68 33 34 187.753 375.51 563.26 750.01 938.76 1126.52 1314.27 1502.02 1689.77 34 35 185.594 371.19 556.78 742.38 927.97 1113.57 1299.16 1484.75 1670.35 35 36 183.379 366.76 550.14 733.52 916.89 1100.27 1283.65 1467.03 1650.41 36 37 181.107 362.21 543.32 724.43 905.53 1086.64 1267.75 1448.86 1629.96 37 38 178.780 357.56 536.34 715.12 893.90 1072.68 1251.46 1430.24 1609.02 38 39 176.397 352.79 529.19 705.59 881.98 1058.38 1234.78 1411.18 1587.57 39 40 173.960 347.92 521.88 695.84 869.80 1043.76 1217.72 1391.68 1565.64 40 41 171.469 342.94 514.41 685.88 857.34 1028.81 1200.28 1371.75 1543.22 41 42 168.925 337.85 506.77 675.70 844.62 1013.55 1182.47 1351.40 1520.22 42 43 166.328 332.66 498.98 665.31 831.64 997.97 1164.30 1330.62 1496.95 43 44 163.680 327.36 491.04 654.72 818.40 982.08 1145.76 1309.44 1473.12 44 45 160.980 321.96 482.94 643.92 804.90 965.88 1126.86 1287.84 1448.82 12 ON THE TERRESTRIAL ELLIPSOID. TABLE I. (Continued.) QUADRILATERAL SURFACES OP 1 DEGREE IN LATITUDE AND in LONGITUDE ON THE TERRESTRIAL ELLIPSOID. Limiting LATITUDES. Multiples of these Quadrilateral Surfaces from 1 to 9. Inf. Sup. 1. 2. 3. 4. 5. 6. 7. 8. 9. 45 46 158.231 316.46 474.69 632.92 791.15 949.39 1107.62 1265.85 1424.08 46 47 155.432 310.86 466.30 621.73 777.16 932.59 1088.02 1243.46 1398.89 47 48 152.584 305.17 457.75 610.34 762.92 915.51 1068.09 1220.67 1373.26 48 49 149.689 299.38 449.07 598.75 748.44 899.13 1047.82 1197.51 1347.20 49 50 146.746 293.49 440.24 586.98 733.73 880.48 1027.22 1173.97 1320.71 50 51 143.757 287.51 431.27 575.03 718.78 862.54 1006.30 1150.06 1293.81 51 52 140.723 281.45 422.17 562.89 703.61 844.34 985.06 1125.78 1266.51 52 53 137.644 275.29 412.93 550.58 688.22 825.86 963.51 1101.15 1288.80 53 54 134.522 269.04 403.57 538.09 €72.61 807.13 941.65 1076.17 1210.70 54 55 131.357 262.71 394.07 525.43 656.78 788.14 919.50 1050.86 1182.21 55 56 128.150 256.30 384.45 512.60 640.75 768.90 897.05 1025.20 1153.35 56 57 124.903 249.81 374.71 499.61 624.51 749.42 874.32 999.22 1124.13 57 58 121.616 243.23 364.85 486.46 608.08 729.69 851.31 972.92 1094.54 58 59 118.289 236.58 354.87 473.16 591.45 709.74 828.03 946.32 1064.61 59 60 114.926 229.85 344.78 459.70 574.63 689.55 804.48 919.41 1034.33 60 61 111.525 223.05 334.58 446.10 557.63 669.15 780.68 892.20 1003.73 61 62 108.089 216.18 324.27 432.35 540.44 648.53 756.62 864.71 972.80 62 63 104.618 209.24 313.85 418.47 523.09 627.71 732.32 836.94 941.56 63 64 101.113 202.23 303.34 404.45 505.56 606.68 707.79 808.90 910.02 64 65 97.575 195.15 292.73 390.30 487.88 585.45 683.03 780.60 878.18 65 66 94.007 188.01 282.02 376.03 470.03 564.04 658.05 752.05 846.06 66 67 90.408 180.82 271.22 361.63 452.04 542.45 632.85 723.26 813.67 67 68 86.779 173.56 260.34 347.12 433.90 520.68 607.46 694.23 781.01 68 69 83.123 166.25 249.37 332.49 415.61 498.74 581.86 664.98 748.11 69 70 79.439 158.88 238.32 317.76 397.20 476.64 556.08 635.52 714.95 70 71 75.730 151.46 227.19 302.92 378.65 454.38 530.11 605.84 681.57 71 72 71.996 143.99 215.99 287.99 359.98 431.98 503.98 575.97 647.97 72 73 68.239 136.48 204.72 272.96 341.20 409.44 477.68 545.91 614.15 73 74 64.460 128.92 193.38 257.84 322.30 386.76 451.22 515.68 580.14 74 75 60.659 121.32 18-1.98 242.64 303.30 363.96 424.62 485.28 545.94 75 76 56.839 113.68 170.52 227.36 284.20 341.04 397.88 454.72 511.55 76 77 53.001 106.00 159.00 212.00 265.00 318.00 371.00 424.00 477.01 77 78 49.145 98.29 147.43 196.58 245.72 294.87 344.01 393.16 442.30 78 79 45.272 90.54 135.82 181.09 226.36 271.63 316.91 362.18 407.45 79 80 41.386 82.77 124.16 165.54 206.93 248.31 289.70 331.08 372.47 80 81 37.485 74.97 112.46 149.94 187.43 224.91 262.40 299.88 337.37 81 82 33.572 67.14 100.72 134.29 167.86 201.43 235.01 268.58 302.15 82 83 29.649 59.30 88.95 118.59 148.24 177.89 207.54 237.19 266.84 83 84 25.715 51.43 77.15 102.86 128.58 154.29 180.01 205.72 231.44 84 85 21.773 43.55 65.32 87.09 108.87 130.64 152.41 174.19 195.96 85 86 17.824 35.65 53.47 71.30 89.12 106.95 124.77 142.59 160.42 86 87 13.869 27.74 41.61 55.48 69.35 83.22 97.09 110.96 124.82 87 88 9.910 19.82 29.73 39.64 49.55 59.46 69.37 79.28 89.19 88 89 5.947 11.89 17.84 23.79 29.74 35.68 41.63 47.58 53.53 89 90 1.983 3.97 5.95 7.93 9.91 11.90 13.88 15.86 17.84 13 TABLES FOR COMPUTING SURFACES TABLE II. QUADRILATERAL SURFACES or 2 DEGREES IN LATITUDE AND IN LONGITUDE ON THE TERRESTRIAL ELLIPSOID. Limiting LATITUDES. Multiples of these Quadrilateral Surfaces from 1 to 9. Inf. Sup. 1. 2. 3. 4. 5. 6. •7. 8. 9. 0 2 896.903 1793.81 2690.71 3587.61 4484.51 5381.42 6278.32 7175.22 8072.13 2 4 895.838 1791.68 2687.51 3583.35 4479.19 5375.03 6270.87 7166.71 8062.54 4 6 893.710 1787.42 2681.13 3574.84 4468.55 5362.26 6255.97 7149.68 8043.3.9 6 8 890.520 1781.04 2671.56 3562.08 4452.60 5343.12 6233.64 7124.16 8014.68 8 10 886.272 1772.54 2658.82 3545.09 4431.36 5317.63 6203.91 7090.18 7976.45 10 12 880.969 1761.94 2642.91 3523.88 4404.85 5285.82 6166.79 7047.76 7928.72 12 14 874.617 1749.23 2623.85 3498.47 4373.09 5247.70 6122.32 6996.94 7871.55 14 16 867.221 1734.44 2601.66 3468.88 4336.11 5203.33 6070.55 6937.77 7804.99 16 18 858.789 1717.58 2576.37 3436.16 4293.95 5152.74 6011.52 6870.31 7729.10 18 20 849.328 1698.66 2547.98 3397.31 4246.64 5095.97 5945.30 6794.63 7643.95 20 22 838.848 1677.70 2516.54 3355.39 4194.24 5033.09 5871.94 6710.78 7549.63 22 24 827.359 1654.72 2482.08 3309.44 4136.80 4964.16 5791.51 6618.87 7446.23 24 26 814.872 1629.74 2444.62 3259.49 4074.36 4889.23 5704.11 6518.98 7333.85 26 28 811.400 1602.80 2404.20 3205.60 4007.00 4808.40 5609.80 6411.20 7212.60 28 30 786.956 1573.91 2360.87 3147.83 3934.78 4721.74 5508.69 6295.65 7082.61 30 32 771.555 1543.11 2314.67 3086.22 3857.78 4629.33 5400.89 6172.44 6944.00 32 34 755.213 1510.43 2265.64 3020.85 3776.06 4531.28 5286.49 6041.70 6796.92 34 36 737.946 1475.89 2213.84 2951.78 3689.73 4427.68 5165.62 5903.57 6641.51 36 38, 719.773 1439.55 2159.32 2879.09 3598.87 4318.64 5038.41 5758.19 6477.96 38 40 700.713 1401.43 2102.14 2802.85 3503.57 4204.28 4904.99 5605.71 6306.42 40 42 680.787 1361.57 2042.36 2723.15 3403.93 4084.72 4765.51 5446.29 6127.08 42 44 660.016 1320.03 1980.05 2640.06 3300.08 3960.09 4620.11 5280.13 5940.14 44 46 638.423 1276.85 1915.27 2553.69 3192.11 3830.54 4468.96 5107.38 5745.81 46 48 616.032 1232.06 1848.10 2464.13 3080.16 3696.19 4312.23 4928.26 5544.29 48 50 592.869 1185.74 1778.61 2371.48 2964.34 3557.21 4150.08 4742.95 5335.82 50 ,52 568.960 1137.92 1706.88 2275.84 2844.80 3413.76 3982.72 4551.68 5120.64 52 54 544.332 1088.66 1632.99 2177.33 2721.66 3265.99 3810.32 4354.65 4898.99 54 56 519.014 1038.03 1557-04 2076.06 2595.07 3114.09 3633.10 4152.11 4671.13 56 58 493.037 986.07 1479.11 1972.15 2465.18 2958.22 3451.26 3944.29 4437.33 58 60 466.430 932.86 1399.29 1865.72 2332.15 2798.58 3265.01 3731.44 4197.87 60 62 439.228 878.46 1317.68 1756.91 2196.14 2635.37 3074.59 3513.82 3953.05 62 64 411.461 822.92 1234.38 1645.84 2057.30 2468.76 2880.23 3291.69 3703.15 64 66 383.164 766.33 1149.49 1532.66 1915.82 2298.99 2682.15 3065.32 3448.48 66 68 354.374 708.75 1063.12 1417.50 1771.87 2126.24 2480.62 2834.99 3189.36 68 70 325.124 650.25 975.37 1300.50 1625.62 1950.75 2275.87 2601.00 2926.12 70 72 295.453 590.91 886.36 1181.81 1477.27 1772.72 2068.17 2363.63 2659.08 72 74 265.398 530.80 796.20 1061.59 1326.99 1592.39 1857.79 2123.19 2388.59 74 76 234.998 469.99 704.99 939.99 1174.99 1409.99 1644.98 1879.98 2114.98 76 78 204.290 408.58 612.87 817.16 1021.45 1225.74 1430.03 1634.32 1838.61 78 80 173.316 346.63 519.95 693.26 866.58 1039.90 1213.21 1386.53 1559.85 80 82 142.115 284.23 426.34 568.46 710.57 852.69 994.80 1136.92 1279.03 82 84 110.728 221.46 332.18 442.91 553.64 664.37 775.09 885.82 996.55 84 86 79.195 168.39 237.59 316.78 395.98 475.17 554.37 633.56 712.76 86 88 47.559 95.12 142.68 190.24 237.79 285.35 332.91 380.47 428.03 88 90 15.860 31.72 47.58 63.44 79.30 95.16 111.02 126.88 142.74 14 ON THE TERRESTRIAL ELLIPSOID. 4 CABLE III. QUADRILATERAL SURFACES OF 5 DEGREES IN LATITUDE AND IN LONGITUDE ON THE TERRESTRIAL ELLIPSOID. Limi LATIT Inf. ting UDES. Sup. Multiples of these Quadrilateral Surfaces from 1 to 9. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0 5 10 15 20 5 10 15 20 25 5599.821 5558.288 5475.466 5351.846 5188.165 11199.64 11116.58 10950.93 10703.69 10376.33 16799.46 16674.87 16426.40 16055.54 15564.49 22399.29 22233.15 21901.87 21407.39 20752.66 27999.11 27791.44 27377.33 26759.23 25940.82 33598.93 33349.73 32852.80 32111.08 31128.99 39198.75 38908.02 38328.27 37462.93 36317.15 44798.57 44466.31 43803.73 42814.77 41505.32 50398-39 50024.60 49279.20 48166.62 46693.48 25 30 35 40 45 30 35 40 45 50 4985.425 4744.891 4468.110 4156.909 3813.408 9970.85 9485.78 8936.22 8313.82 7626.82 14956.27 14234.67 13404.33 12470.73 11440.22 19941.70 18979.57 17872.44 16627.64 15253.63 24927.12 23724.46 22340.55 20784.54 19067.04 29912.55 28469.35 26808.66 24941.45 22880.45 34897.97 33214.24 31276.77 29098.36 26693.86 39883.40 37959.13 35744.88 33255.27 30507.26 44868.82 42704.02 40212.99 37412.18 34320.67 50 55 60 65 70 55 60 65 70 75 3440.013 3039.419 2614.598 2168.779 1705.427 6880.03 6078.84 5229.20 4337.56 3410.85 10320.04 9118.26 7843.80 6506.34 5116.28 13760.05 12157.68 10458.39 8675.12 6821.71 17200.06 15197.09 13072.99 10843.89 8527.13 20640.08 18236.51 15687.59 13012.67 10232.56 24080.09 21275.93 18302.19 15181.45 11937.99 27520.10 24315.35 20916.79 17350.23 13643.42 30960.12 27354.77 23531.39 19519.01 15348.84 75 80 85 80 85 90 1228.213 740.973 247.668 2456.43 1481.95 495.34 3684.64 2222.92 743.00 4912.85 2963.89 990.67 6141.07 3704.86 1238.34 7369.28 4445.84 1486.01 8597.49 5186.81 1733.68 9825.71 5927.78 1981.34 11053.92 6668.76 2229.01 ["ABLE IV. QUADRILATERAL SURFACES OF 10 DEGREES IN LATITUDE AND IN LONGITUDE ON THE TERRESTRIAL ELLIPSOID. Limi ATIT — — —__ Cnf. i 0 10 20 ting UDES. Sup. Multiples of these Quadrilateral Surfaces from 1 to 9. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10 20 30 22316.220 21654.626 20347.180 44632.44 43309.25 40694.36 66948.66 64963.88 61041.54 89264.88 86618.50 81388.72 111581.10 108273.13 101735.90 133897.32 129927.76 122083.08 156213.54 151582.38 142430.26 178529.76 173237.01 162777.44 200845.98 194891.63 183124.62 30 40 !50 40 50 60 18426.004 15940.634 12958.864 36852.01 31881.27 25917.73 55278.01 47821.90 38876.59 73704.02 63762.54 51835.46 92130.02 79703.17 64794.32 110556.02 95643.80 77753.18 128982.03 111584.44 90712.05 147408.03 127525.07 103670.91 165834.04 143465.71 116629.78 60 70 80 70 80 90 9566.755 5867.281 1977.282 19133.51 11734.56 3954.56 28700.26 17601.84 5931.85 38267.02 23469.12 7909.13 47833.77 29336.40 9886.41 57400.53 35203.69 11863.69 66967.28 41070.97 13840.97 76534.04 46938.25 15818.26 86100.79 52805.53 17795.54 15 TABLES FOR COMPUTING SURFACES. TABLE V. MEAN QUADRILATERAL SURFACES OP 1, 10, 20, AND 30 MINUTES IN LATITUDE AND IN LONGITUDE DEDUCED FROM EACH QUADRILATERAL OF 1 DEGREE IN TABLE I. Limiting LATITUDES. Mean Surfaces measuring in Latitude and in Longitude. Limiting LATITUDES. Mean Surfaces measuring in Latitude and in Longitude. Inf. Sup. 1'. 10'. 20'. 30'. Inf. Sup. 1'. 10'. 20'. 3O'. 0 1 0.0623 6.229 24.918 56.065 45 46 0.0440 4.395 17.581 39.558 1 2 0.0623 6.228 24.910 56.048 46 47 0.0432 4.318 17.270 38.858 2 3 0.0622 6.224 24.895 56.015 47 48 0.0424 4.238 16.954 38.146 3 4 0.0622 6.218 24.873 55.965 48 49 0.0416 4.158 16.632 37.422 4 5 0.0621 6.211 24.844 55.898 49 50 0.0408 4.076 16.305 36.686 5 6 0.0620 6.202 24.807 55.815 50 51 0.0399 3.993 15.973 35.939 6 7 0.0619 6.191 24.763 55.716 51 52 0.0391 3.909 15.636 35.181 7 8 0.0618 6.178 24.711 55.599 52 53 0.0382 3.823 15.294 34.411 8 9 0.0616 6.163 24.652 55.467 53 54 0.0374 3.737 14.947 33.630 9 10 0.0615 6.146 24.586 55.317 54 55 0.0365 3.649 14.595 32.839 10 11 0.0613 6.128 24.512 55.152 55 56 0.0356 3.560 14.239 32.038 11 12 0.0611 6.108 24.431 54.970 56 57 0.0347 3.470 13.878 31.226 12 13 0.0609 6.086 24.343 54.771 57 58 0.0338 3.378 13.513 30.404 13 14 0.0606 6.062 24.247 54.556 58 59 0.0329 3.286 13.143 29.572 14 15 0.0604 6.036 24.144 54.325 59 60 0.0319 3.192 12.770 28.731 15 16 0.0601 6.009 24.035 54.078 60 61 0.0310 3.098 12.392 27.881 16 17 0.0598 5.979 23.917 53.814 61 62 0.0300 3.002 12.010 27.022 17 18 0.0595 5.948 23.793 53.534 62 63 0.0291 2.906 11.624 26.154 18 19 0.0592 5.915 23.662 53.239 63 64 0.0281 2.809 11.235 25.278 19 20 0.0588 5.881 23.523 52.927 64 65 0.0271 2.710 10.842 24.394 20 21 0.0584 5.844 23.378 52.600 65 66 0.0261 2.611 10.445 23.502 21 22 0.0581 5.806 23.225 52.256 66 67 0.0251 2.511 10.045 22.602 22 23 0.0577 5.766 23.065 51.897 67 68 0.0241 2.411 9.642 21.695 23 24 0,0572 5.725 22.899 51.523 68 69 0.0231 2.309 9.236 20.781 24 25 0.0568 5.681 22.725 51.132 69 70 0.0221 2.207 8.827 19.860 25 26 0.0564 5.636 22.545 50.727 70 71 0.0210 2.104 8.414 18.933 26 27 0.0559 5.590 22.358 50.306 71 72 0.0200 2.000 8.000 17.999 27 28 0.0554 5.541 22.164 49.869 72 73 0.0190 1.896 7.582 17.060 28 29 0.0549 5.491 21.964 49.418 73 74 0.0179 1.791 7.162 16.115 29 30 0.0544 5.439 21.756 48.952 74 75 0.0168 1.685 6.740 15.165 30 31 0.0539 5.386 21.542 48.470 75 76 0.0158 1.579 6.315 14.210 31 32 0.0533 5.330 21.322 47.974 76 77 0.0147 1.472 5.889 13.250 32 33 0.0527 5.274 21.095 47.463 77 78 0.0137 1.365 5.461 12.286 33 34 0.0522 5.215 20.861 46.938 78 79 0.0126 1.258 5.030 11.318 34 35 0.0516 5.155 20.622 46.399 79 80 0.0115 1.150 4.598 10.346 35 36 0.0509 5.094 20.375 45.845 80 81 0.0104 1.041 4.165 9.371 36 37 0.0503 5.031 20.123 45.277 81 82 0.0093 0.933 3.730 8.393 37 38 0.0497 4.966 19.864 44.695 82 83 0-.0082 0.824 3.294 7.412 38 39 0.0490 4.900 19.600 44.099 83 84 0.0071 0.714 2.857 6.429 39 40 0.0483 4.832 19.329 43.490 84 85 0.0060 0.605 2.419 5.443 40 41 0.0476 4.763 19.052 42.867 85 86 0.0049 0.495 1.980 4.456 41 42 0.0469 4.692 18.769 42.231 86 87 0.0039 0.385 1.541 3.467 42 43 0.0462 4.620 18.481 41.582 87 88 0.0028 0.275 1.101 2.477 43 44 0.0455 4.547 18.187 40.920 88 89 0.0017 0.165 0.661 1.487 44 45 0.0447 4.472 17.887 40.245 89 90 0.0006 0.055 0.220 0.496 F 16 ERRATA IN THE FIRST EDITION. A, page 7, line below the title, instead of (32 + ^ a:0) read (32 -f f x°). A, " 21, on the line beginning with 30, in the last four columns, instead of 100.75 100.97 101.20 101.42 read 10085 101.07 101.30 101.52. B, " 7, on the line beginning with 23°, second column, instead of 20.410, read 20.888. B, " 23, on the line beginning with 12°, third column, instead of 5.87, read 5.37. B, " 30 - 32, at the head of each first column, Temperature of the Air, add " in Centigrade degrees." B, " 40, Table II., first part, on the line beginning with 60, column headed 7, instead of 24.11,01, read 24.9,01. B, " " Table II., first part, on the line beginning with 70, column headed 5, instead of 27.4,47, read 27.8,47 ; and column headed 8, instead of 28.11,77, read 28.9,77. B, " " Table II., second part, on the line beginning with 70, column headed 5, instead of 328.47, read 332.47. B, " 41, Table III., line beginning with 20, the five last columns, instead of 63.54 66.08 68.62 71.16 73.70, read 63.50 66.04 68.58 71.12 73.66. B, "« " Table III, line beginning with 200, column headed 3, instead of 515.11, read 515.61. B, " 42, Table V., line beginning with 180, column headed 7, instead of 516.21, read 506.21. B, " 43, Table VI., first part, on line beginning with 70, column headed 2, instead of 76.635, read 76.735. B, " " Table VI., second part, on line beginning with 7, the last eight columns, instead of 0.6483 0.6572 06661 06750 0.6839 0.6927 0.7016 0.7105, read 0.6395 0.6483 0.6572 06661 0.6750 0.6839 0.6927 0.7016. B, " 43, Table VI., second part, on line beginning with 12, column headed 5, instead of 1.1018, read 1.1102. C, " 11, on line beginning with 26.5 inches, column headed 6, instead of 674.41, read 674.61. C, " " on line of 27.1 inches, column headed 1, instead of 688.38, read 688.58. C, " 12, on line of 30.5 inches, column headed 2, instead of 778.20, read 775.19. C, " 39 and 41, at the head of table, instead of " Tenths of Degrees," read " English Inches." I), " 28, 29, and 30, head of page, instead of " Tenths of a Degree," read " Hundredths of a Degree." D, " 35, note at the bottom, instead of " Geology," read " Geodesy." D, " 36, on line beginning with 160, columns headed 8 and 9, instead of '550.19 and 553.47, read 551.19 and 554.47. D, " 36, on line beginning with 260, columns headed 2, 3, 5, and 6, instead of 860.59 863.87 879.43 882.72, read 859.60 862.88 869.44 872.72. D, " 37, on line beginning with 620, column headed 4, instead of 2048.28, read 2047.28. D, " " " " " 770, " 0, " 2526.39, " 2526.29. D, " 38, . " " " 880, " 5, " 2903.69, " 2903.60. D, " " " " " 890, " 6, " 2939.79, " 2939.69. D, " " " " « 930, " 5, " 3069.64, " 3067.64. D, " " " " « 990, " 4, " 3261.71, " 3261.21. D, " " " " " 990, " 5, " 3264.59, " 3264.49. D, " 39, on line beginning with 1380, columns headed 3, 4, 5, 6, 7, 8, instead of 4537.28 4540.56 4543.85 4547.13 4550.41 4553.69, read 4537.48 4540.76 4544.05 4547.33 455061 4553.89. D, " 40, on line beginning with 1610, column headed 5. instead of 5292.65, read 5298.65. D, " 44, Table X., on line beginning with 3, column headed 6, instead of 21.0205, read 23.0205. D, " 45, Table XII., on line beginning with column 0, column headed 5, instead of 0.83333, read 0.08333. f 14 DAY USE RETURN TO DESK FROM WHICH BORROWED LOAN DEPT. This book is due on the last date stamped oelow, or on the date to which renewed. Renewed books are subject to immediate recall. -5M57GC REC'D 13 i8Jan'60Ej v»»» ii/iY 1 4 1983 MAi * * w rec'd circ. APR 1 8 1983 LD 21-100m-6 '56 J, .Gen«al,LLb»JT . (B9311slO)476 University of California Berkeley GENERAL LIBRARY - U.C. BERKELEY