ELECTRIC DISCHARGE WITH THE CHLORIDE OE SILVER BATTERY. 
207 
190,000 ohms. This tube was destroyed by the sudden discharge of the 
condenser before the adoption of the Stokes’ safety wire, figs. 69 and 70, 
and 26, Part I. 
Tube 119, Air. 
199. — This tube had a calibrated chamber connected to it between two stop- 
cocks, the calibrated portion having a capacity of yvKo part of the tube. 
With 2160 cells — less would not pass — it produced at a pressure of about 1'5 
m.m. 1974 M, a very close stratification, the strata being 0‘05 inch apart, as at 
the left-hand of fig. 61. On letting in ttgo P ar b hy opening the stop-cock 
connected with the calibrated chamber, the pressure was increased to 2 m.m., 
2632 M, and the strata became much wider. The exhaustion was then 
• carried gradually further, until it required 3240 cells to pass, and ultimately 
4800 ; the pressure was so low that we could not then determine it. There 
were only ten strata produced, as in the right hand of fig. 61, a large dark 
space intervening between the last stratum and the negative terminal. This 
tube, unfortunately, cracked near the negative terminal before the con- 
templated experiments could be completed. This occurred some days after 
an experiment during which the negative terminal had become overheated. 
Fig. 61. 
When the tube is composed of portions having different bores, the strata vary in 
width and distance in the different parts, being narrower and closer in the portions 
of smaller diameter. This is illustrated by tubes Nos. 18, 26, 51, and 161. 
Tube 18, Nitrogen. 
200. — This tube is represented in fig. 12, Plate 16, copied from a photograph 
obtained in one minute, August 3rd, 1875, and communicated to the 
Academie des Sciences of Paris.* The dimensions of the tube are as 
follows : length between the terminals, 32 inches ; the horizontal diameter 
of the left hand ellipsoidal bulb, 4 inches ; the tube connecting it with the 
central bulb, 12 inches ; the horizontal diameter of the central bulb, 4 ' 2 5 
inches ; the vertical, 5'25 inches ; the tube on the right hand of the central 
bulb, 11 inches ; and the horizontal diameter of the bulb on the right, 4 '2 5 
* ‘ Comptes Rendus,’ xvi., 686, and xvii., 746, 1875. 
