﻿186 Mr. Horace H. Poole on the 



this pressure for several days the vessel was finally exhausted 

 as perfectly as possible by absorbing out the residual gas 

 with coconut charcoal in liquid air. During this process 

 some water was evolved by the orangite. The valve was 

 then closed. The vessel contains 480*05 grams of orangite. 



The ice used in this determination was specially frozen by 

 an ice-making firm out of water which had been distilled in 

 the laboratory. This ice was used for packing both the 

 inner and the outer vessels, but for repacking the latter 

 commercial ice was used. It was hoped that the use of this 

 distilled-water ice would reduce the temperature variations 

 which always occurred with commercial ice, but they 

 remained as large as ever. 



The daily temperatures are shown on the chart ABCDEF. 



Fig-. 2. 



44 

 40 

 36 



■ ze 



A 





































E 























J 























( 





\ 







*■ 



























































































\ 



I 





































c 







! 

















O ?8 





















B\ 













- S 



\" 



V 







j 







I 











•— ,» 







Y 20 



























\ 























F 



5 ~ 







1 















" K 







r ~^ 





























a 

 CO 







































































































































































































20 ZZ 24 26 28 30 32 



1R 40 42 4* 4« 



Days. 



During the periods represented by AB, CD, and EF the 

 heater was not in use. During the period BC current was 

 flowing through the heater, 5000 ohms being inserted in 

 series with it. As the voltage of the cell remained at 2*01 

 throughout the w'hole experiment the heater was generating 



/ 2-01 \ 2 

 V5129-5>/ X 



129-1x3600 

 4-18 



= '017 calorie per hour. 



During the period DE 2000 ohms were in series with the 

 heater so that the heat Generated was 



/ 2-01 V 

 \212y-o) 



129-1x3600 

 4-18 



= •0992 calorie per hour. 



The mean temperatures finally attained in the various 

 periods are given in the table. In column A is the period, 



