Rfco))i/>inii/fo/i of I(>ns in Air and Temperature of Air. 6()5 



ratio -T^2 '^^ these temperatures, provided all the conditions are 



a 2 

 kept constant except of course the temperature. 



In comparincr these values, then, the observations were 

 taken in the folio wino- manner : — The deflexions d^ and d2 

 were measureil at the tem])erature of the room. The air in 

 the cylinder was then heated up to a given steady tempera- 

 ture/and when it had become steady the deflexions d^ and d^ 

 were again measured. The air was then heated to a still 

 higher temperature, and when it reached a steady point d^ 

 and t/o ^vere measured once more. This was repeated in the 

 same manner for several temperatures. The values of the 



Fig-. 6. 



.•wo 



270 

 2oo 

 240 

 225 

 210 

 195 

 180 

 1K5 

 150 

 135 



P§ 120 































































































































































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J 









































/ 







































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/^ 







































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^ 



































r^ 



































X 



^ 

































— ■ 





-"^ 

















































































































15 30 45 



d. 



90 105 120 135 150 165 180 195 210 225 2-10 255 270 285 300 



Temperature Centigrade, 

 were then plotted against the corre- 



ratio -j-s thus found 



sponding temperatures. A number of these series of observa- 

 tions were made, and one of the curves is given in fig. 6. 



