of Hydrogen and some other Gases. 335 



into the tube : hence finally I used palladium asbestos 

 instead of copper ; and in this case the heating temperature 

 being below 250° C, an ordinary glass was used as the 

 combustion tube, both ends of the tube being fused together 

 to the rest of the apparatus. In consequence of this change 

 of arrangement, not only was the measurement of suscept- 

 ibility of hydrogen greatly facilitated, but the results of the 

 experiment became quite consistent. 



The hydrogen generator, purifying train, the reservoir, 

 and the compressing cylinder, together with the measuring 

 tube, are shown in fig. 8. a is a large cylinder having a 



Fijr. 8. 



capacity of 4 litres. About 3 litres of pure dilute sulphuric 

 acid was put into it ; the concentration of the solution w r as 

 the same as used by Morley, e. g. it contained one-sixth of 

 pure sulphuric acid in volume, b is a glass tube placed 

 concentrically with the cylinder in a. The anode is placed 

 in the upper portion of the cylinder, while the cathode is 

 placed at the lower part of tube b. Each electrode has an 

 area of 25 sq. cm. C is a bulb for preventing the passage 

 of the acid fumes upwards, d is a large glass bottle filled 



