BETWEEN ONE ATMOSPHERE AND HALF AN ATMOSPHERE OF PRESSURE. 363 

 Thus 



2Hj/(H, + H,) = 1 -000041 

 m(T 8 T,)= + '000019 

 2 _0,) = + -000028 

 R = -000231 



B = 



999775 



In the above calculation the volumes of the principal capacities at the two pressures 

 have been assumed to be as 2 : 1 exactly. As has already been explained, the value 

 of B so obtained is subject to correction of -000021 to be subtracted. 



Hence 



B = '99975, 



a result in strictness applicable to the temperature 11 '0 C. The hydrogen is some- 

 what less compressible than according to BOYLE'S law, as was to be expected from its 

 known behaviour at pressures above atmosphere. 



The Results. 



After the above explanation it will suffice to record the tinal results of the various 



sets of observations. 



HYDROGEN. 



In the case of hydrogen the agreement of single results is remarkably good. This 

 gas, as well as all the others, was carefully dried with phosphoric anhydride. 



CARBONIC OXIDE. 



3 A 2 



