1166 
MR. G. F. RODWELL ON THE EFFECTS OF HEAT ON CERTAIN 
while in the other case they may exist as a literal alloy—a solidified solution of the 
one substance in the other, like glass. 
Fig. 7. 
Fig. 8. 
Fig. 9. 
24. In the case of the alloy Cu 2 I 2 .AgI, which contains 61*7767 per cent, of iodide of 
copper, the effect of the 38*2233 per cent of iodide of silver has been— 
(a) To diminish the coefficient of expansion below 256° C. from *00007317 to 
*00004998. 
(b) To annul the expansion altogether between 256° C. and 284° C. and between 
309° C. and 319° C. 
(c) To produce contraction on heating between 284° C. and 309° C., viz.: through 
25° C. 
(d) To augment more than two-fold the coefficient of expansion above 319° C., viz.; 
from *00007317 to *00016665. 
