﻿4:88 Evolution of Gas from the Cathode in Helium. 

 Table III. — Aluminium Cathodes, Current, 3'0 milliamperes. 



Duration 

 of current 

 (minutes). 



Sample 

 Hel 



STo. 5 in 

 ium. 



Sample No. 6 in 

 Argon. 



Calculated 



increment 



in pressure. 



Gas pres- 

 sure (mm.). 

 ±•02. 



Pressure 



increment. 



±•02. 



Gas pres- 

 sure (mm.). 

 ±•015. 



Pressure 



increment. 



±•015. 







3 - 76 

 3-84 

 390 

 3-96 

 4 00 

 4-05 

 4-08 

 4-11 

 4-15 







•08 



•14 



•20 



•24 



•29 



•32 



•35 



•39 



3-19 



3-27 



3-35 



3-37 



341 



3-435 



3-445 



3-48 



351 







•08 

 •16 

 •18 

 •22 

 •25 

 •26 

 •29 

 •32 







•04 



•11 



•19 

 •27 

 •34 

 •42 

 •49 

 •57 



1 



3 



5 



7 



9 



11 



13 



15 





Table IV. — Magnesium Cathodes. Current, 1*0 milliampere. 



Duration 

 of current 

 (minutes). 



Sample No. 1 in 

 Helium. 



Sample No. 2 in 

 Argon. 



Calculated 



increment 



in pressure. 



Gas pres- 

 sure (mm.). 

 + •015. 



Pressure 



increment. 



+ ■015. 



Gas pres- 

 sure (mm.). 

 + •01. 



Pressure 



increment. 



+•01. 







3-25 

 3-28 

 3-31 

 3-34 

 3-36 

 3-38 

 3-39 

 341 

 3-43 







•03 



•06 



•09 



•11 



•13 



•14 



•16 



•18 



2-28 

 2-30 

 2-325 

 2-35 

 2-375 

 2-39 

 2-41 

 2-43 

 2-45 

 1 





 •02 

 •045 

 •07 

 •095 

 •11 

 •13 

 •15 

 •17 







•013 



•04 



•06 



•09 



•11 



•14 



•16 



•19 



1 



3 



5 



7 



9 



11 



13 



15 





Table V.— Magnesium Cathodes. Current, 2*0 milliamperes. 



Duration 

 of current 

 (minutes). 







1 



3 



5 



7 



9 



11 



13 



15 



Sample No. 3 in 

 Argon. 



Gas pres- j Pressure 



sure (mm.) increment. 



+•01. +-01. 



2-27 

 2-30 

 234 

 2-36 

 2-40 

 2*42 

 244 

 2-45 

 2-47 







•03 



•07 



•09 



•13 



•15 



•17 



•18 



•20 



Sample No. 4 in 

 Argon. 



| Gas pres- 

 sure (mm.). 

 + •01. 



Pressure 



increment. 



+ •01. 



222 



2-26 



2-30 



2-32 



2 - 35 



2-37 



2-38 



2-415 



2 42 





 •04 

 •08 

 •10 

 •13 

 •15 

 •16 

 •195 

 •20 



Calculated 

 increment 

 in pressure. 







025 



075 



13 



18 



23 



28 



33 



38 



