748 Prof. Townsend and Mr. Hurst on the 
The numbers corresponding to the lower pressures have 
been taken from the tables in the previous paper on this 
subject. 
A1r.—Sparking potentials. 
| X. p. | a. Bes | \e 
1050 8 6500 |) (1808) blo aos 
1400 8 Da Ree eae a 
1050 6 ‘672 |) eon oS gga 
700 4 eerie ats 615) 
1050. | 4 | na OS ag 
| + 625 | Bo OL 48) 
| 700 2 Lis *B75. 414). 408.. |. can 
B50 1 113, / >. 895°) |. eRe 
| 437 1 832 364} BBbiras 
| 350 66 965 B38. 0] 1» OlSOiet 
437 66 A 
HyproGen.—Sparking potentials. 
X. p. | a. | Be 4 ae be ve 
at Nek Se eae GSE | 
| | 
1050 | 20 | G43 8 67h ee ae 
875 / 16 | ‘710 | 621 | 619 | 
1050, | 1116. 4 4]--9 468 485 | 490 | 
ZOD. ,4)I 12 | ‘791 555 | 561 
1050 | 12 353 370 389 
peo YY 8 ‘927 486 487 
700 gia ene ay 309) gs 
1050 8 306 322 | 322 
350 4 1-14 399." | > goon 
525 4 613 9222). 5... aoa 
700 4 ‘405 383) ) s,J-. 9 SSChaaae 
350 | 2 810 283". .| »: ae 
525 2 BOL uf 268 eae | 
1 806 282 289 
| a Ps 
. The accompanying curves (figs. 2 and 3) represent the. 
connexion between the sparking potential and the product 
