DISRUPTIVE DISCHARGE OF ELECTRICITY. 665 
TasL—E XXIJ.—Pressure Curve, 12th July 1877. Dielectric, Hydrogen. 
Electrodes, large discs. Length of spark, ‘5 centimetre. Temperature, 





70° Fahr. 
Equation, V = -024,/{p’+ 600p}. 
Pressure in Observed ‘Mean pean Duis of Calculated 
mm. of Deflection. Zero. Diff. of Diff. of eS catie Diff. of Difference. 
Mercury. n. ni, Potential. | poten tial eee. Potential. Vi_-V. 
fis Ww —n, : ve We 
439 511 re Amat | ieee A id 
752 | =. ; rg [725 | 2408 24:20 0-07 
{| 445 510 65 x : 
648 1 ABS A as 65 21°62 21:09 0°53 
450 . 60 }) 
572 452 58 59-5 19°81 19°65 +016 
450 J 60 LS 
461 512 Sipe ve 
468 | bie : st | t 5! 16-98 16-97 +0-01 
470 ‘ 42 
364 471 i 41 42 13-98 14-22 — 0:24 
470 - 42 
2 481 Y 31 \ : 4 d 
269 { en ‘ sit 1032 11-41 1-09 
485 \ 27 
158 488 i 24. 25 8°32 8:31 40-01 
487 Ms PAYS) 
495 is 7 ? ; 7 2 
56 | ae e tox [ft 1 4-99 4-60 40:39 
f 500 * A \ ; Lane 
oll ( 502 % 10x f 10 3°33 3°36 0:03 





TasLtE XXIII.—The Electric Strength of Different Gases, 5th July 1877. 
Electrodes, large discs. Pressure, 746 mm. Length of spark, ‘5 


centimetre. 
F Electric 
c f Diff. of Mean = Mean of all A ; 
Dielectric. ee ae me Potential. | Diff. of |, Strengel other fee ays 
n. nm, 1 : relative to that inzay raeee Values. 
uU—n. Potential. OR AGE: Observations 
(|) 350u |) / bor 151 
360 “3 141 
348 # 1553 
S 344 2”? 157 59 
“a 347 | 502 pay ee 
352 a 150 
350 . 152 
L| 345 j 157 




VOL. XXVIII. PART II. 8 kK 

