ELECTRIC DISCHARGE WITH THE CHLORIDE OE SILVER BATTERY. 
73 
Table YI. — Showing the length of spark between two nearly flat surfaces. 
Curve. 1200 cells. 
2400 cells. 
3600 cells. 
4800 cells. 
5880 cells. 
6960 cells. 
8040 cells. 
inch. 
inch. 
inch. 
inch.- 
inch. 
inch. 
inch. 
0-014 
0-021 
0-031 
0-049 
0 059 
0-075 
0-089 
June 25, 1877. 
0-011 
0-023 
0-033 
0-051 
0-058 
0-073 
0-086 
June 26, 1877. 
0-011 
0-018 
0-033 
0-047 
0-058 
O 
© 
0-090 
June 26, 1877. 
X. Mean 0 012 
0-021 
0 03? 
0-049 
0-058 
0-073 
0-088 
The mean results are laid down in curve X., Plate 7, where curves VIII. and IX. 
are repeated from Plate 6 for the sake of comparison. By inspection of these curves it 
will be seen that curve X. is sensibly parallel with curve VIII., the lengths of spark 
with the planes being uniformly greater than those with the spherical surfaces. The 
mean values for 1200 and for 4800 cells are abnormally high ; but this would cease to 
be the case if the observations 0’014 for 1200 cells, June 25th, and 0 # 051 for 4800 cells, 
June 26th, be neglected. Above 2400 cells the curve of the planes is intermediate 
between Sir William Thomson’s (curve IX.) and our curve of the spherical surfaces 
(curve VIII.). Table VII. is given for comparison with Table III. 
Table VII. — Two 
planes. 
Volts. 
Striking distance. 
Difference. 
Between 
inch. 
volt. 
250 
0-00233 
242 
0 
500 
0-00475 
250 
and 
750 
0-00725 
250 
1000 
0-00975 
420 
1000 
1500 
0-01400 
300 
and 
2000 
' 0-01700 
325 
2000 
2500 
0-02025 
500 
and 
3000 
0-02525 
505 
3000 
3500 
0-03030 
595 
and 
4000 
0-03625 
675 
4000 ' 
4500 
0-04300 
630 
and 
5000 
0-04930 
470 
5000 
5500 
0-05400 
355 
and 
6000 
0-05755 
620 
6000 
6500 
0-06375 
625 
and 
7000 
0-07000 
630 
7000 
7500 
0-07630 
645 
and 
8000 
0-08275 
8000 
MDCCCLXXVIII. 
L 
Additional length of spark 
for 1000 additional volts. 
1 
0-00975 
0-00725 
0-00825 
0-01100 
0-01305 
0-00825 
0-01245 
0-01275 
