ELECTRIC DISCHARGE WITH THE CHLORIDE OF SILVER BATTERY. 
77 
Number of 
Leng 
th of spark. 
cells. 
Point + 
Point — 
Ratio of col. 2 
Remarks. 
(col. 1). 
(col. 2). 
(col. 3). 
to col. 3. 
inch. 
inch. 
8040 
0-3430 
0-1900 
1-8 
Mean of three observations made on different days. 
5640 
0-2230 
0-1280 
1-7 
March 4, 1876. 
5> 
0-2420 
0-1320 
1-8 
Feb. 
15, 1876. A different point used. 
3240 
0-0600 
0-0600 
1-0 
Feb. 
12, 1876. A point of 20° used. 
2160 
0-0285 
0-0400 
0-71 
Jan. 
21, 1876. 
1080 
0-0034 
0-0050 
0-67 
Jan. 
12, 1876. Battery Ho. 1 (powder) used. 
„ 
0-0037 
0-0055 
0-67 
„ Ho. 2 
,, 
0-0030 
0-0057 
0-67 
„ Ho. 3 
„ 
0-0070 
0-0107 
0-67 
„ Ho. 5 (rod) „ 
In order to arrive at the best form of the point we took a wire of copper, 
brass, silver, platinum, zinc, magnesium, or steel, and turned it in a lathe to various 
outlines, making slight alterations as to sharpness, bluntness, or curvature between 
successive trials of the length of spark, and when a distinct result was obtained the 
Fig. 12. 
