﻿Prof. R. Bunsen's Calor metric Researches. 

 For the first glass, 



177 







W^=2'7446; 







for the second, 



W^=2-8616 











W^=2'8777 



* 







Mean 



. , =2-8697 







W w is 

 tion 



obtained from 



the following two experiments by 



the 



equa 





W. 



Table III. 











Experiment I. 



Experiment II. 



Weight of water 



G 



G p 

 t 



•Mi-Mg 



Is. 

 n 



Qo-Qr 



0-3333 

 0-2223 

 0-5230 



99°-474 C. 

 76' 



00 



00 

 573-9 



0-3333 

 0-2223 

 0-5230 



l)9 3 -474 C. 

 86' 



+0-067 



+0064 

 568-1 



Weight of glass tube 



Weight of platinum sinker ... 



Temperature of heating 



Duration of experiment 



Scale before experiment 



Scale after experiment 



Observed scale-divisions 



Constants 



W„= 0-4692: W„=, 2-870 











The calculation gives : — 



From Experiment 1, 



From Experiment 2. 



Mean , 



W* =14-660 

 W w = 14-654 



W = 14-657 



In illustration of the method described, I now give the results 

 of determinations made with chemically pure substances, whose 

 specific heat has been determined with great exactness by the 

 methods up till now in use. The details of these observations 

 are arranged in the following Table IV., in which the letters used 

 refer to those employed in equations (5) and (7) : — 



Phil Mag. S. 4. Vol. 41, No, 272. March 1871. 



N 



