DETERMINATION OF DEFLECTION OF LIGHT P>Y THE SUN’S GRAVITvVTIONAL FIELI 
more comparable than are the images of the fainter stars. The measures of these stars 
are given in the following table :— 
No. of 
Eclipse 
Plate. 
Measured Values of Tty for Stars Nos.^— 
5 4 3 6 10 
No. of 
Eclipse 
Plate. 
Measured Values of Ty for Stars Nos.— 
5 4 3 6 10 
r r r r r 
r r r r r 
1 
—0-051 +0-175 +0-169 +0-201 +0-235 
9 
-0-059 +0-121 +0-109 +0-205 +0-180 
2 
+0-558 +0-656 +0-724 +0-668 +0-702 
10 
+0-033 +0-270 +0-188 +0-258 +0-280 
3 
+0-124 +0-285 +0-286 +0-274 +0-355 
11 
+0-025 +0-215 +0-210 +0-233 +0-274 
4 
+0-111 +0-222 +0-247 +0-231 +0-167 
12 
—0-068 +0-144 +0-124 +0-160 +0-167 
5 
+0-034 +0-228 +0-232 +0-218 +0-308 
15 
—0-038 +0-138 +0-107 +0-172 — 
6 
+0-164 +0-488 +0-478 +0-557 +0-637 
16 
-0-050 +0-076 +0-046 +0-127 +0-073 
7 
—0-051 +0-156 +0-162 +0-250 +0-279 
17 
—0-071 +0-104 +0-081 +0-186 +0-164 
8 
+0-108 +0-330+0-314 +0-376 +0-397 
18 
+0-016 +0-092 +0-109 +0-099 +0-084 
The equations given by these stars are 
— 
0-160d 
— 1 
•107e 
- 0 
•789a 
+ / = 
(1) 
+ 
0-334d 
+ 0' 
•472e 
+ 1' 
• 336a 
+ / = 
(2) 
+ 
0-348d 
+ 0' 
•360e 
+ 1 
•574a 
+ / = 
= ^yz 
(3) 
+ 
0-587d 
+ 1' 
•099e 
+ 0' 
• 726a 
+ / = 
= 
(4) 
+ 
0'860d 
+ !■ 
•321e 
+ 0- 
•589a 
+ 1 = 
- 
(5) 
The mean of (4) and (5) added to (1) gives 
+ 0 • 564d +. 0 • 103e - 0 • 131a + 2/ Dys + i + Dyio). 
While the sum of (2) and (3) gives 
+ 0*682d + 0-832e + 2-910a + 2/= %, + 
Subtracting these we get 
3-041a + 0-729e + 0-118d == Dy, + - %5 - i + Dy,o). 
This equation has a small coefficient for e and a very small one for d. 
Calculating the quantities on the right-hand side, assuming e to be the same for 
all the plates, and substituting the values of d from the previous table, we find :— 
r . r 
a + 0-240e = 
+ 0-056 
1 
a “h 0•240e = 
+ 0-035 
9 
a +- 0 • 240e = 
+ 0-049 
2 
a -{- 0 • 240e = 
+ 0-048 
10 
a + 0 • 240e = 
+ 0-047 
3 
a + 0 • 240e = 
+ 0-045 
11 
a -f 0•240e = 
+ 0-059 
4 
a -f 0•240e = 
+ 0-059 
12 
a -f- 0-240e = 
+ 0-050 
5 
a 0'283e ^ 
+ 0-026 
15 
a -i- 0 • 240e = 
+ 0-059 
6 
a -f 0•240e = 
+ 0-024 
16 
a +- 0 • 240e = 
+ 0-036 
7 
a -h 0•240e = 
+ 0-028 
17 
a -f 0■2406 
+ 0-046 
8 
a -|- 0 • 240e = 
+ 0-029 
18 
