PHYSICS OF THE AIR
jy, of intense, 406 i, 402 >8
4-, 51
nt distance between,   436 A., 349, 362, 363 ^7 ', 240
47
, il8, 419, 420 0
267, 403, 473, 540, 571
36, 397
/clones in, 189 circulation in, 141 .U-IVJJJL of to latitude, 59 stratus, 287 Strouhal, V., 425, 426 Strutt, R J., 88, 600 Sun, apparent size of, 435 Sunrise and sunset, times of, 448 Sunshine, measurement of, 18
recorder, 19
Sunspots and temperature, 592 Supralateral tangent arcs, 515 Surface covering, 611
change of, 567 Stiring, K, 40, 62, 75, 134, 135, 174, 247,
249, 603, 610 Suzuki, S., 157 Sverdrup, H. U., 120 Swann,  W.  F.  G.,   383,  386,  391,  392
T
Tangent arcs of halo of 22°, 501
of halo of 46°, 514 Taylor, G. I., 120, 242 Teisserenc de Sort, L., 46, 146 Temperature, affected by volcanic dust,
584
changes, importance of small, 597 correction of due to dust radiation, 577 decrease with height, adiabatic, 28, 29
why, 44
gradients, vertical, 40 storm effects on, 53
Temperature, gradients, summer, 41
winter, 41 inversion, 42, 156 planetary and absorbing shell, 93 potential, 32 registration of, 3 relation of to circulation, 607 to height of barometer, 54 to land area, 606 to land elevation, 602 to sunspots, 93, 592 to surface covering, 611 scales, 640
variations of since 1750, 593 Temperatures, comparison of, 1 *   condition of, equality of, 1 Tephigram, 259 Thermal belt, 157 Thermograph, 3, 4 Thermometer, 3 shelter, 2, 4 wet bulb, 14 Thiessen, A. H., 550 Thomas, N., 244 Thomson, Sir. J. J., 360 Thomson, Sir William, 12, 382 Thunder, cause of, 364, 422 distance heard, 365, 423 duration of, 423 musical, 423 rumbling of, 364, 423 Thunderstorm, anticycloriic, 330 border, 332 cooling of, 337 course of events in, 335 cross-section of, 341 cyclic, hind period of, 311
ocean period of, 315 cyclonic, 322 daily land period of, 310
oc.oan period of, 310 electricity, origin of, 300
Simpson's theory of, 303 frequency of, 317 geographic distribution of, 315 heat, 318 humidity in, 344 maximum   frequency,   hours  of,
301
season of, 311 periodic recurrence of, 309 pressure changes in, 342