LOSS OK IKON P.Y OXIDATION IN i'( 1'OI.AS.
lime, and silicate of soda, shown in Table 63 I cast and prepared two rolls from eacli heat, coating one and leaving the surface of the other bare, connecting the two for immersion in liquid iron by a rod M after the plan seen in Fig. 51, page 232. By a study of Table 64, one will perceive that the chilled rolls coated with lead best resist fusion by immersion, as well as the heat of melting in the cupola. In fact, all the immersion tests made coincided very closely with the results found by the twin shaft cupola experiments, and strongly confirm the conclusion to be drawn from Table 63, page 311.
TABLE 67.—ANALYSES OF SILICON AND MANGANKSK IN LOW AND HIGH BED IRONS, OF TABLE 65. SICK PACKS 313 AND 3 I 7-
Heat No. n>.
Height of bed, low side .......... Height of bed, high side. ........ i..|i 'o<> ol o1
Difference .... .( i^ II '
Ural No. H.
After completing the tests illustrated in Tables 63 and 64, I thought it desirable to learn what clifferejiee, if any, high and low beds of fuel might cause in losses of iron. By referring to Table 65 it will be seen that tests Nos. 9 and 10 were heats having the chilled pig rolls charged without coating, whereas heats Nos. n and 12 had the surface of the iron protected with a wash of lead blacking. In all these four heats, it will be seen the loss was slightly greater with the iron charged on the high bed, or that side using the most fuel. While this is true, it is to be said that more fine shot and scrap was found in the side having the low .... ........ 3. .11 3-»3 .'•.•W 3-21