438 Specific Heat of Iron at High Temperatures. 



platinum envelope used suffers deterioration at a fairly rapid 

 rate. 



The diminution at 900° and subsequent rise in the specific 

 heat of iron, shown by the author's experiments at the higher 

 part of the range, require confirmation, and some experiments 

 now in progress indicate that it may be possible to construct 

 envelopes of inert materials more refractory than porcelain, 

 which would permit the extension of the range upward 

 of the experiments to above the melting-point of the 

 metal. 



Total Heat between 0° and T°.— Q T . 



T. 



Pionchon's 

 value from 



Pionchon's 

 value re- 



The Author's 

 value. 





formula. 



calculated. 



200 



23-5 



23-5 



23-5 



300 



36-8 



36-8 



37-0 



400 



51-6 



51-6 



51-3 



500 



68-2 



66-0 



66-9 



600 



87-0 



83-2 



83-8 



700 



108.4 



102-2 



104-1 



800 



135-4 



125-0 



127-8 



900 



157-2 



146-7 



148-0 



1000 



179-0 



1660 



155-7 



1100 







168-8 



Mean Specific Heat between 0° and T°.— S T . 



T. 



S T. 



: t. 



700 



S T. 



•1487 



200 



•1175 



250 



•1204 



750 



•1537 



300 



•1233 



800 



•1597 



350 



•1257 



850 



•1647 



400 



•1282 



900 



•1644 



450 



•1311 



950 



•1612 



500 



•1338 



1000 



•1557 



550 



•1361 



1050 



•1512 



600 



•1396 



1100 



•1534 



650 



•1440 







