658 
TasLE XIV.—Distance Curve, discs having first been heated, 20th July 1877. 
ALEXANDER MACFARLANE ON THE 
Dielectric, Air. 
Equation, V =87:040s—19°560s”. 
Electrodes, large discs. 



Zero. 
n, 
Observed 
Potential. 
Diff. of 
u—n, 
13 
10 
23 
35 
46 
50 
73 
90 
103 
122 
140 
153 
165 
180 
178 
49 
50 



Mean Diff. Calculated 
Mean of Potential Diff. of 
Diff. of in absolute Potentialin 
Potential. measure. abs. meas. 
vi. 
i 15 | 450 4-30 
23 8:99 8°51 
35 13°69 12°62 
46 17:99 16°63 
50 19°56 20°54 
fle 28°56 28:07 
90 3021 35°21 
103 40:29 41:95 
122 AT72, 48°31 
140 54-76 54:28 
153 59°85 59°85 
165 64:54 65:03 
Liza 70-02 69:83 
ae 
Taken after an interval of 45 minutes :— 
Length of 
Spark in Deflection. 
Centimetres, N. 
s. 
: ( 510 
oo ents 
‘1 500 
“LD 488 
2 477 
"25 473 
30 450 
“45 433 
"05 420 
65 401 
‘75 383 
"85 370 
95 308 
{| €343 
SDE Na ees 
OR 474 
= | 473 
ons fl, =2BS 
2 aed 
a. Fils aes 
h| S498 

523 
” 
520 
» 

Taste XV.—Change of Capacity of Charged Conductor, 4th July 1877. 
Dielectric, Air. Electrodes, large discs. Pressure, atmospheric. Length 
of spark, -5 centimetres. 
Capacity. 
Large jar, 
5 
5d 
513 
Me 
97 
Deflection. 
l 
j 
We 

Zero Potential 
: wa —n, 
500 200 
496 201 
490 200 
486 193 
505 209 
: 208 
209 
Pressure, 740 mm. 
Difference 
vi_V. 
+0:20 
+048 
+1:07 
+1°36 
—0°98 
+0°49 
0:00 
—1°66 
—0°59 
+0°48 
0:00 
—0:49 
+019 
| 
Mean Diff. 
of Potential. 
