MESSRS. W. DE LA RUE AND H. W. MULLER ON THE 
5(340 CELLS. 
Date. 
Distance 
between terminals. 
Date. 
Distance 
between terminals. 
inch. 
inch. 
. Feb. 
15 
0-2315 
1876. April 
17 
0-2430 
,, 
15 
0-2420 
20 
0-2443 
Mar. 
4 
0-2230 
May 
9 
0-2400 
,, 
4 
0-2400 
„ 
10 
0-2340 
11 
0-2420 
25 
0-2320 
15 
0-2410 
,, 
26 
0-2380 
17 
0-2430 
28 
0-2280 
„ 
21 
0-2400 
29 
0-2350 
„ 
31 
0-2430 
29 
0-2200 
April 
1 
0-2400 
Mean = 0-2370 
Date. 
5640 CELLS. 
Form of terminals. 
1876. Jan. 10 A conical point of 20° + and plate of IT in. diam. — 
„ 11 
Feb. 12 
„ 12 
„ 14 
Mar. 15 
Distance 
between terminals, 
inch. 
0T80 
0-174 
0-194 
0-212 
0-188 
0-175 
Mean = 0-184 
Ratio of the striking distance with a conical and with a paraboloidal point = 
184 
237 
= 0-7764. 
8040 CELLS. 
Form of terminals. 
A paraboloidal point + and a plate from IT in. to U5 in. diam. — 
Date. 
Distance 
between terminals. 
Date. 
Distance 
between terminals. 
Date Distance 
between terminals. 
inch. 
inch. 
inch. 
1876. May 28 
0-341 
1876. Aug. 12 
0-348 
1876 Dec. 5 
0-355 
„ 28 
0-340 
„ 15 
0-352 
„ 9 
0-340 
„ 29 
0-340 
„ 18 
0-348 
1877. Jan. 5 
0-340 
June 7 
0-343 
„ 19 
0-343 
Feb. 13 
0-342 
„ 8 
0-340 
Oct. 14 
0-353 
April 24 
0-320 
„ 10 
0-335 
„ 17 
0-345 
„ 24 
0-340 
„ 27 
0-335 
„ 19 
0-345 
May 7 
0-340 
July 10 
0-340 
„ 19 
0-341 
„ 15 
0-344 
„ 15 
0-340 
„ 21 
0-341 
„ 15 
0-330 
„ 19 
0-344 
„ 24 
0-340 
„ 18 
0-348 
„ 22 
0-342 
„ 25 
0-340 
22 
0-330 
„ 25 
0-340 . 
Nov. 7 
0-340 
”, 23 
0-340 
„ 31 
. 0-343 
„ 27 
0-355 
„ 24 
0-340 
Aug. 4 
0-340 
00 
<M 
0-355 
CO 
CM 
0-350 
„ 5 
0-340 
Dec, 1 
0-355 
CO 
CM 
0-358 
Mean 
= 0-343 
