324 SIR F. W. DYSON, PROF. A. S. EDDINGTON AND MR. C. DAVIDSON ON A 
Star. 
Ay. 
\y- 
-lOx. 
E,,. 
\y- 
Resid. 
11 
1586 
1095 
- 14 
1109 
+ 6 
1103 
+172 
5 
858 
642 
-124 
766 
-127 
893 
- 38 
4 
1881 
1015 
-173 
1188 
4-234 
954 
+ 23 
3 
1785 
961 
-175 
1136 
-f272 
864 
- 67 
6 
1909 
779 
—199 
978 
-fl36 
842 
- 89 
The normal equations are 
whence 
58/+ 2-838 k = +1 
2-838/+ 4-838k = -105 
3-238k = —105, 
Sk = —33. 
The corresponding deflection at the limb is 
l"-75 — 0"'31 = l"-44. 
Plate W. 
Although the exposure was only 10 seconds the images have jumped in E.A., so 
that the appearance is dumb-bell shaped. They are, however, symmetrical, so that fair 
measures of x can be made ; the y measures on which the result chiefly depends are 
unaffected. Star 10 is very diffused in R.A. 
(1) Comparison with Oxford Plate Di. 
Theoretical plate-constants 
a = +4-9, h, d = +6-5, e = +39-7. 
Star. 
X. 
Ax. 
4 
<3 
fE;,. 
Ago;. 
-^91^. 
[> 
CO 
4 
<1 
Resid. 
5 
12-40 
2450 
2370 
-79 
2449 
267 
2182 
2208 
4- 40 
4 
17-34 
3948 
3741 
-54 
3795 
1704 
2091 
2109 
- 59 
3 
17-48 
3834 
3634 
-69 
3703 
1602 
2101 
2124 
- 44 
6 
19-87 
4525 
4266 
+ 3 
4263 
2275 
1988 
1987 
-181 
10 
22-60 
5199 
4911 
4-17 
4894 
2476 
2418 
2412 
+244 
Star. 
y- 
Ay. 
\y- 
-91x. 
\y- 
Ej/. 
+?/- 
Resid. 
5 
2-93 
5320 
5123 
-1128 
6251 
-127 
6378 
-0-69 
+ 70 
4 
18-72 
5745 
4889 
-1578 
6467 
+234 
6233 
+ 1-27 
- 75 
3 
17-60 
5911 
5098 
-1591 
6689 
+272 
6417 
+ 1-48 
+109 
6 
24-99 
5628 
4507 
-1808 
6315 
+ 136 
6179 
+0-74 
-129 
10 
27-21 
5616 
4389 
-2057 
6446 
+ 114 
6332 
+0-62 
+ 24 
