606 
ME. J. HOPKINSON ON THE 
V. the values of B, again not corrected for the rapid decrease in ^ after each 
insulation. 
It may be remarked that the image in this case moved in 10 seconds about f of what 
it attained in 20 seconds. 
I. 
II. 
III. 
IV. 
V. 
1 
2 
470 
468 
469 
0-42 
i 
300 
325 
310 
0*28 
2 
178 
183 
180 
0*16 
3 
134 
134 
133 
0-12 
4 
105 
107 
106 
0-094 
5 
89 
91 
90 
0-080 
7 
68 
69 
68 
0-061 
10 
52 
54 
53 
0-047 
15 
39 
41 
40 
0-036 
20 
32 
36 
34 
0-030 
30 
29 
28 
0-025 
60 
20 
20 
0-018 
90 
16 
16 
0-014 
600 
6 
6 
0-005 
Experiment S. — The charging with 48 elements lasted 5 minutes. The experiment 
was tried twice with positive and negative charges respectively. II. and III. give the 
readings, whilst IV. gives the value calculated from the curve of y. 
I. 
II. 
III. 
IV. 
h 
385 
385 
1 
212 
228 
232 
2 
110 
112 
3 
66 
67 
72 
4 
47 
47 
50 
5 
34J 
I CO 
37 
10 
11 2 
10 
13 
15 
5 
6 
