AND RATIO OF THEIR xVTOMIG WEKJIITS. 



of iiKTcury in globe A, introduced by slight accident. The volume to be sub- 

 tracted fi't>ni the capacity of the globes is therefore 1.;? cul)ic centiiuetres, and the 

 effective capacity during the experiments of this series was therefore 43257.4 cubic 

 centimetres. 



'28. HYDROGEN HY NEW .-METHOD. SECOND APPARATUS. 



PUMP AND BAROMETER. 



CONNECTION (M' (iLOHES TO 



The globes called A, B, and were now placed in the cylinders which were 

 to protect them from the contact of large fragments of ice, and were packed in 

 finely crushed ice, and connected as shown in Fig. 28. The tube c led to the 



[^'i^oooK^r Cromer, 





"fW 



Fig. 28,— Second apparatus for receiving hydrogen and measuring its volume and pressure at constant temperature : 



globes without stopcocks. 



upper edge of the tank where it joined the mercurial valve shown at/_y Ii, which 

 was interposed between the globes and the pump. At i was a mark. In measure- 

 ments of the pressure of hydrogen in the globes, the level of the mercury in the 

 mercurial valve was always brought to this mark. All the tubes between this 



