﻿178 



Prof. U. Bunsen's Calorimetric Researches. 

 Table IV. 



Substance ex-| 

 amined J 





Cast 

 silver. 



Cast 

 zinc. 



Cast an- 

 timony. 



Cast cad- 

 mium. 



Very old 

 roll sulphur. 



Weight of sub-] 



stance J 



Weight of glass ] 



tube] J 



Weight of plati- 1 



num sinker . . . J 

 Temperature ofl 



heating j 



Duration of ex-*l 



periment J 



Scale before ex- 1 



periment j 



Scale after ex-1 



periment j 



Indication of the 1 

 scale J 



G 



Gg 

 G p 

 t 



Mi-Mo 

 Is. 



m Q 

 £i. 

 m x 



Qo-Qi 



3-6320 

 

 



100°-00C. 



60' 











297-7 



2-5150 

 

 



99°-80C. 

 60' 

 





 343-8 



3-8575 











99°-80C. 



64' 









 279-5 



1-8675 











99°-80C. 



63' 









 146-7 



10708 

 

 

 100°- 00 C. 

 55' 

 







268-8 



Constants 



W=14-657 













In the following Table V. the specific heats calculated from 

 these data are placed beside those of Regnault obtained by the 

 mixture method : — 



Table V. 



Substances. 



Tee-calorimeter. 

 a. 



Regnault's results, 

 b. 



a-h 



Water 



10000 

 00559 

 00935 

 00495 

 0-0548 

 01712 



1-0000 

 00570 

 0-0956 

 0-0508 

 0-0567 

 01764 



-00011 

 -00021 

 -00014 

 -0*0019 

 -00052 



Silver 



Zinc o....< 



Antimony 



Cadmium 



Sulphur 





Thus the values obtained by the ice-calorimeter are seen to 

 agree very nearly with those obtained by Regnault, but are 

 always a little less. "Whether or not these constant deviations 

 are due to differences in the methods adopted can scarcely be 

 decided from so few experiments, especially as these were made 

 while I was engaged with other work ; but still, although the 

 were not made with very special care, they were free from any 

 considerable source of error. 



The following Table VI. contains experiments with several 

 pure elements whose specific heats have not been determined 

 hitherto. The specific and atomic heats calculated from these 

 results are arranged together in Table VII, :~~ 



