MR. F. W. DYSON ON THP] POTENTIAL OF AN ANCHOR RINO. 
1099 
The following Table shows the change in the radius of a ring in which Cq/c^q = 100. 
When the ring is near the plane, the approximate formula 
c (log -5 + i) 
L\ — 
a 
Oo (log 
8c„ 
a. 
was used, but in other cases the exact formula. 
0. 
z 
a 
z 
“0 
c 
t'o' 
0 
45 
104 
1-04 
60 
61-8 
1-07 
70 
40-0 
1-10 
75 
.30-5 
1-14 
80 
21-3 
1-21 
83 
16-0 
1-30 
85 
121 
1-38 
86 
10-1 
1-44 
10 
8T2 
1-52 
8 
G-26 
1-63 
6 
4-67 
1-80 
5 
3-60 
1-93 
4 
2-, 5 
212 
3 
1-93 
2-42 
7 A 2 
