AND RATIO OF THEIR ATOMIC WEIGHTS. 



3. PEELI^dNAHV WEIGHING OF GLOBES. 



A balance carrying twelve lumdred grammes in each pan was mounted du a 

 case designed for tlie accurate weighing of globes containing oxj'gen or hydj'ogen. 

 This case, with tlie l»Mlaiice, is seen in Fig. 1. Its walls are thirteen centimetres 



Fli:. 1. — Preliminary weighing of a glulie. 



thick, as are also the top, the bottom, and the doors ; all are filled with non-con- 

 ducting material. Hooks attached to the pans of the balance pass through the top 

 of the case. To one of these the globe, with its stopcock closed, was suspended, 

 and a thei'moineter was placed at its side. After an hour, the weight of the globe 

 was determined, the case was opened long enough to observe the thei'moraeter, and 



the height of the barometer was noted. 



A second observation was ma<le after 



