Ot 



if Hydrogen and some other Gases. 321 



by the decomposition of: a solution of potassium hydroxide 

 by electrolysis. The electrodes were of sheet nickel attached 

 to stout nickel rods, the strength ot the solution being two 

 normal. The cell consisted of two concentric glass cylinders, 

 the inner one having no bottom ; one of the electrodes was 

 placed in the inner cylinder and the other placed in the 

 space between these two cylinders. The current density was 

 0*05 ampere per sq. cm. The generated gas was collected in 

 a large glass reservoir by replacing water. Before intro- 

 ducing the gas into the measuring tube, she gas was purified 

 by passing through bottles and tubes containing strong 

 sulphuric acid, solid potassium hydroxide, and phosphorus 

 pentoxide. 



The susceptibilities of the gas thus purified and the air 

 treated likewise, as described in the last Section, were 

 compared at the ordinary temperature and pressure ; the 

 ratio of the mass of the gases being determined by calcu- 

 lation by knowing the temperature and pressure of the atmo- 

 sphere at the time of filling the gases in the measuring tube. 



In the following table an example of the results of the 

 measurement is shown : — 



Table IY. 



March 19, 1918. 





Air. 





Vacuum. 



(*=l 



2 o -9C.,p=748-0mm. J *=13°-5C.) 



7 ]1 15 ul p.m 



.,*=15°-5 C, 6=20-0. 



7 1 



' 45 ,n f.m.,-*=15°-3 C, 6=20-0. 



0. 



s. s. 





C. S. 8. 



amp. 



cm. cm. 





imp. cm. cm. 







41-50 10-70 





50-75 22-90 



10 



52-20 10-20 





10 73-65 22-40 







42-00 9-60 





51-25 22-30 



10 



51-60 10-30 





10 73-55 22-75 







41-30 1010 





50-80 22 60 



10 



51-40 10-40 , 





10 73-49 22-40 







41-00 10-22 (mean) 



51-00 22-56 (mean) 





2 . 





Calculation. 



=13 o "l'0.,7»=748-0mm« l *=13°-5 

 7 h 55 m p.m., *=14°-75 C. : 6=20-0 



i.O.) 



^=69-89-10-22 = 59-69 cm., 



O. 



S. d. 





^=22-56-10-22= 12-34 cm., 



amp. 



cm. cm. 









 10 



13-60 72-00 

 85-60 69-20 



*■ a ■ 



59-67 001210 287"3 

 >0° C. ~ 12 '34 0-001335 X 288-3 







10 



16-40 69-00 

 85-40 69-50 





=4-365. 







15-90 69-30 



(Xo 2 



) 2 0oc.- 104 - 1 ^ 10 ~ ( - 



10 



85-20 69-80 











15-40 70-15 







10 



85*55 70'15 











15-40 69-89 (mean) 





J hil Mag. 



. S. 6. Vol. 39. No. 231 



. March 1920, Y 



