34 



Drs. Kamsay and Young on 



In the examples which follow, the same substance has not 

 always been taken as the standard ; but generally, in the 

 comparison of any two bodies, that one is taken as correct 

 which is likely to have been the more accurately investigated. 

 Twenty-two different bodies have been examined, and they 

 are arranged in twenty-three couples. The absolute tempe- 

 ratures corresponding to definite vapour-pressures of a number 

 of substances are given in the tables in a previous portion of 

 this paper. For other substances, curves were drawn to 

 represent the relation of temperature to pressure, and the 

 temperatures corresponding to definite pressures read off. 



1. Ratios of the Absolute Temperatures of Water and Carbon 

 Bisulphide at Definite Vapour-pressures. — As an example of the 

 method employed, the whole of the data are given in this case, 

 and also a diagram showing how the value of c may be 

 obtained graphically. The absolute temperatures of water 

 corresponding to the definite vapour-pressures are taken 

 to be correct, and are made the ordinates in fig. 1. The 



Fig. 1. 



° I 

 o ■ 



■ 



■ 



o J 



■ 



o ! SB 



o I 



0-820 



0-830 



0840 



0-850 



0-870 



0-880 



0-890 



0-900 



cs, 



Ratios of Absolute Temperature;- . ^r^L 



t±qU 



