78 Brown—The Densities and Specific Heats of some Alloys of Iron. 
Taste XIV. 
Tungsten STEELS. 
| Percentage Composition Specific 
Heat 
Mark | Chee sane hc exo 
| 
1294F 0-16 ON | io 0-1162 0-9229 
1204H 0:28 0-28 3°5 0°1136 0-9161 
12941 | 0:38 | 0:20 75 0°1100 09121 
1294L | 0-76 0-28 15:5 0-1041 0-9181 
In Table XIV. are given the specific heats and thermal capacities of four 
tungsten steels; and in the tungsten curve, fig. 6, the specific heats are plotted 
against the percentage of tungsten present. ‘These results show the remarkable 
effect of a high percentage of tungsten when added to iron, in diminishing the 
specific heat of the material. Taking the specific heat of pure iron as 0:1134, the 
addition of one per cent. of tungsten appears to increase the specific heat by 
0:0028, and for higher percentages the specific heat is decreased. 
By comparing the first and last specimens, it is seen that the addition of 14:5 
per cent. of tungsten to iron that already contains 1 per cent. of tungsten 
decreases the specific heat of the material by 0:0121, or about 10°4 percent. And 
since tungsten added to iron éecreases the density and decreases the specific heat, 
the thermal capacity per unit volume is very nearly constant, as will be seen 
from the last column of Table XIV. 
TABLE XV. 
SILICON STEELS. 
Percentage Composition Specific 
Heat 
Mark C Si o pxo 
So Ch Ie 0:028 0:07 0°1134 0°89338 
898 E 0:20 2°50 0:1200 0°9232 
898 H 0:26 5°50 0-1194 0°8967 
In Table XV. are given the results for two silicon steels, with which is put that 
