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 4- .000 0034 6 very closely. If the formula were strictly correct the true 

 specific heat at any temp, would be : .03174 +.000 006 86, which is probably true to i% as it is. 



Determinations by W. P. White. Geographical Laboratory. 

 SMITHSONIAN TABLES. 



