ELECTRIC DISCHARGE WITH THE CHLORIDE OF SILVER BATTERY. 
191 
was detached November 17, 1876, and now, March 16, 1878, it still shows 
this beautiful phase. Fig. 3, Plate 16, represents the phenomena; it is 
copied from a photograph obtained in 40 seconds. 
109. — On introducing 900,000 ohms resistance, the same number of cells being 
used, 26 pink strata were produced, as shown in fig. 4, Plate 16, from a 
photograph obtained in 90 seconds. 
Tube 139, Air. 
110. — Pressure 13’5 m.m., 17,763 M, 8040 cells. A long nebulous discharge 
reaching within 6 inches of the ring negative, which was illuminated with 
a cylindrical glow, the intervening space being non-luminous. 
Tube 139, 1st Charge of Hydrogen. 
111. — Pressure 5'9 m.m., 7763 M, 8040 cells, C. 0’02007 W. 
„ 3 - 0 m.m., 3947 M, the current of 4800 cells passed. 
„ 2-0 m.m., 2632 M, 3600 
„ 0-9 m.m., 1184 „ 2400 
„ 0‘6 m.m., 789 „ ,, ., 
,, 0‘03 m.m., 39 „* ,, ,, 
„ „ „ „ „ „ „ with 4,000,000 
ohms. 
0‘01 m.m., 13 ,, 
3600 
112. — Pressure 0'03 m.m., 39 M, 2400 cells, 4,000,000 ohms resistance, a phase 
was produced resembling 11, Plate 16. 
Tube 139, 2nd Charge of Hydrogen. 
113. — Pressure 16'7 m.m., 21,974 M, 8040 cells, just passed. 
114. — Pressure 14'9 m.m., 19,605 M, 8040 cells, C. 0 - 00386 W. A glow 
extending from the positive half the length of the tube. 
115. — Pressure 12 m.m., 15,789 M, 8040 cells. One luminosity as 3, fig. 50, 
a reddish fawn, and the centre a brilliant red colour. As resistance is decreased two successively join. 
When resistance is removed all the 19 striae assume the double convex form, the red central line continuing. 
.... On the sides of the tube where four or five of the disks near the negative impinge there remained a 
black deposit.” 
* Jan. 11, 1877. We had at that date the McLeod gauge connected with the pumps. 
