DISRUPTIVE DISCHARGE OF ELECTRICITY. 
TasLtE X VIII.—Pressure Curve, 3d July. Second Curve. 
Dielectric, Air. Electrodes, large discs. 
Equation, V = -04455,/ {p+ 200p'. 

Without jars on. 
Length of spark, 5 centinietre. 

Mean Diff. of 






Pressure in Observed M Potential j Calculated 
mm. of Deflection. Zero Diff. of Di hoe f es ih ae Diff. of 
Mercury. n. al, Potential. | p : 2 “al pe aae Potential. 
D. i! Jn, otential. ee V. 
492 Hil? 20 ) 
25 4.92 20 20°3 2-73 3:34 
491 : a1 | f 
(| 482 . 30 x A: 
40 \ 484 ‘ 98 30 4:04. 4°36 
m ¢| 472 F 40 : ioe 
60 1 470 < 49 Al HOA 5°56 
(| 460 ‘ 52 # 
80 i 460 i 52 52 7:00 6°67 
454 13 58 ro. . ; 
100 | es aa \ 585 787 7°72 
{| 443 3 69 / ! 
120 i 443 ‘ 69 69 9°29 8°73 
§| 440 513 en ah) . "9 
140 1 440 73 f ric 9°83 9°72 
435 78 
160 | ee : ie 79 1063 10°69 
( 429 2 84 1 ; F 
180 1 495 ‘i 88 f 86 11:58 11°65 
(| —418 Ps 95 
200 1 418 ( 95 95 12°79 12°60 
4 385 . 128 x : } 
303 | a ; i ; 128 17-23 17°39 
( 355 a 158 } 
340 “4 is p : : 
406 | 246 if 167 -~165 22°21 22°10 
348 165 \ 
E Gl 303 HM 200 x 5 ' 
509 ( 308 ; 905 200 26:92 26°73 
(| 280 : DB deal Cvs ee 
612 1 980 ‘ 933 i 233 31°36 | 3141 




VOL. XXVIII. PART II. 


661 
Difference. 
vi_v. 
— 0°32 
—- 0°04 
+0°33 
+015 
+0°56 - 
+011 
—0:06 
—0:07 
+019 
—016 
+011 
— 0:05 

