Height of flame = radius of disc, i.e., 6 5 e: 
TABLE I. — Distance of Tube from Disc Varied, 
Sign of 
Charge on 
Flame. Disc. 
Distance 
of Tube Deflection, 
from Disc. 
Abs. Value 
of Dili, of 
Potential. 
14-67 
18-30 
2309 
Remarks on Appearance of the Flame. 
Flame lias only a slight protuberance towards the disc, 
diminished, nor made more bluish ; spark passes to pro- 
tuberance. 
Flame much more attracted ; spark passes through a consider- 
able portion of the flame. 
13-85 
1723 
Flame attracted, but not in contact, assumes n toothed form 
broadened out across the disc, diminished, and more bluish ; 
spark through the flame. 
Attracted, toothed form now lost; diminished, and made more 
bluish ; spark through the flame. Sometimes diminished so 
much as to put out the flame. 
Flame repelled down ; spark passes from about the centre of the 
disc to the edge of the tube. 
Flame repelled as before ; spark passes more through the flames. 
Ditto. 
name repelled very much ; spark evidently greater and from the 
higher part of the disc. 
Sputtering sound at the flame heard before the passing of the 
Great repulsion with increased sputtering at the flame ; index 
guve uo sign of discharge previous to the spark. 
Scintillations in the direction of the disc ; spark very largo ; index 
steady some time before the passing of the spark. 
name attracted before being repelled down ; index steady a con- 
siderable time before the passing of the spark. 
name attracted so as to be in contact ; spark goes through the 
Ditto. 
name attracted, but scarcely reaching to the disc; spark passes 
through the flame. 
name attracted first, then repelled, becoming horned and less 
luminous. Spark does not pass to tip, but nbout half way 
down. 
Flnme repelled, losing luminosity ; spark does not go through the 
flume. 
A lnrge spark after some time ; spark goes below the flame, not 
through it. 
Ci 
-<l 
05 
Proceedings of the Royal Society ■ Edinburgh, Session 1881 - 82 . 
