634 



Decomposition of Water-Vapour 

 Wire No. II. 



Temperature 

 absolute. 



Per cent, decorupo- 1 Calculated per cent, 

 sitionatthe pressure} • decomposition at 

 of water-vapour. '■ 760 mms. pressure. 



1350° C 



0-00644 



0034 



0-0593 



00704 



0-148 



0-203 



0-264 



0-00175 



0-00887 



0-0158 



001842 



0-0388 



0-053 



0-068 



1500 „ 



1560 „ 



1630 „ 



1770 „ 



1890 , 



2030 „ 





Fig. 1. 



J 



V 



y 



The values obtained with the two wires are very fairly 

 concordant, and would undoubtedly seem to represent the 

 amount of decomposition taking place under the conditions 

 of the experiments. 



The apparatus used for the 

 experiments on the separation of 

 the oxygen and hydrogen through 

 partial recombination by the pla- 

 tinum spray, is shown in fig. 1. 



A current of water-vapour en- 

 tered at A and was decomposed 

 by the hot platinum wire Pt 

 (which had a small weight W 

 attached to it) while passing up 

 the narrow portion of the appa- 

 ratus, so that a condition of equi- 

 librium between the vapour and 

 electrolytic gas was reached in 

 the compartment D. The oxygen 

 and hydrogen were withdrawn 

 through B and C, and as the 

 entrance into E from D was only 

 about 2 mms. wide and had the 

 hot wire passing through it, it was 

 expected that the gas collected 

 through B would largely consist 

 of that which immediately sur- 

 rounded the wire in D, while the 

 portion pumped off through C 

 would contain the gas from the 

 cooler parts of D. 



