288 



Dr. H. F. Weber on the Specific Heat of 



now quickly sealed and the weight determined. The weight of 

 the glass tube was 1*105 grm., and that of the enclosed porous 

 carbon 1*410 grm. A platinum spiral weighing 0*655 grm. 

 served as a weight to sink the tube under the water in an ice- 

 calorimeter. The specific heat of the platinum spiral between 

 0° and T was C _ T = 0*0319 +0*000004T. The mean specific 

 heat of the glass employed was from 0° to 24<°=0*1880, 0° to 

 99°=0*2017, 0° to 203°=0*2103, 0° to 256°=0*2136. From 

 the following tabulated results the amounts of heat given up by 

 the porous carbon, the glass, and the platinum spiral, in cooling 

 from 23°, 99°, and 224° to 0°, are obtained; and from these and 

 the data already given the specific heat of porous carbon for the 

 above-mentioned temperature-intervals are deduced. 



First Series. 



N =9881. 



G. 



T. 



N. 



W. 



1-410 



i23-l 





r 



1-105 



105-7 



10-698 \ 



0-655 





\ 



1-410 



} 





r 



1105 



[23-9 



108'9 



11-020^ 



0655 



J 





I 



1-410 



1 





r 



1105 



^23-4 



106-6 



1 0792 ^ 



0655 



J 





1 



'0-1 23. 



Carbon . 

 Glass .... 

 Platinum 



Carbon . 

 Glass .... 

 Platinum 



Carbon . 

 Glass .... 

 Platinum 



01663 



01880 

 00320 



01647 



01880 

 00320 



01650 



0-1880 

 00320 



Mean specific heat of porous carbon between 0° and 23 0- 5 =0-1653 



Second Series. 

 N =9*981. 



'0-100' 



Carbon . 

 Glass .... 

 Platinum 



Carbon . 

 Glass .... 

 Platinum 



Carbon . 

 Glass .... 

 Platinum 



1-410 



) 





r 



1105 



[ 9910 



506-1 



51-22 i 



655 



J 





I 



1-410 



1 





r 



1105 



[ 99-25 



505-8 



5119^ 



0655 



J 





I 



1-410 



1 





r 



1-105 



I 99-30 



508-2 



51-44 ^ 



0-655 



J 





I 



01935 

 2017 

 0323 



01928 

 2017 

 00323 



01943 

 2017 

 00323 



Mean specific beat of porous carbon between 0° and 99° -22=0-1 935, 



