ELECTRIC DISCHARGE WITH THE CHLORIDE OF SILVER BATTERY. 
103 
The communication between the top and bottom chambers was now closed, pressure 
60"2 m.m., 79,210 M, 11,000 cells, current bottom negative 0'04474 W, bottom 
positive CC03459 W, jar-potential, both chambers, 4538 cells, depression—- 
Lower terminal. 
— 
+ 
m.m. 
m.m. 
12 
10 
11 
10 
Mean. 
11-5 
10 
Ratio of increased pressure . 
1-19 
116 
The discharge took place when the top was negative in a curved arch from the 
upper rim of the disc to the point, and from the lower point it was axial to the 
centre of the underside of the disc ; the underside of the disc formed a new negative, 
while its upper side formed a new positive terminal, Plate 8, fig. 30. 
Summary.—Ratio of increased to normal pressure. 
Lower chamber. 
— 
+ 
1-44 
1-39 
1-34 
1-41 
1-13 
1-20 
1-22 
1-34 
1-38 
1-40 
1-16 
1-11 
1-19 
1-16 
1-266 
1-287 
It would appear therefore that the dilatation of the gas is the same both in the 
positive and negative chambers. 
In order to prosecute our experiments in a vessel of still greater capacity, we had 
constructed a larger jar with a neck at each end, or, more properly speaking perhaps, 
a tube as represented in fig. 86, supported horizontally on ebonite crutches. It is 
37 inches, 94 centims., long and 5y§ inches, 14‘8 centims., in diameter, and its cubical 
content 14,435 cubic centims., or 3’8 times that of the bell-jar, fig. 79, p. 84. The 
ends are ground and are closed by caps with necks, C', C', also ground flat; the holes 
in the necks are likewise ground so as to receive two tubes T', T'; in these tubes are 
sealed wires on which terminals of any form may be screwed ; this has to be done after 
they have been inserted through the caps and before the caps have been placed in 
position; by this arrangement terminals nearly as large as the neck of the tube may 
be used. The tubes which hold the terminals are furnished with glass cocks. The 
joints are made air-tight by means of grease, and the caps are kept in their places 
