240 



Tables 260, 261. 

 TABLE 260- — Additional Specific Heats of the Chemical Elements. 



TABLE 261. —Mean Specific Heats of Quartz, Silica Glass, and Platinum from zero, C, to the tem- 

 perature named. 



The mean specific heats of quartz above 550° are here increased by the heat (2.3 calories) of 

 the inversion at 575°. The accuracy is probably better than 2 per mille. 



The results for Platinum follow the formula : 



Sp. Heat = .03174 -I- .000 0034 e very closely. If the formula were strictly correct the true 

 specific heat at any temp, would be : .03174 +.000 006 8 0, which is probably true to 1% as it is. 

 Determinations by W. P. White. Geographical Laboratory. 



Smithsonian Tables. 



