304 SIR F. W. DYSOX, PROF. A. S, EDDINGTON AND MR. C. DAVIDSON ON A 
19. The values of Da: and T>y were equated to expressions of the form 
ax hy c aE_^ (= Dx) 
and 
dx ey + / + aE^ (= D^), 
where x, y are the co-ordinates of the stars given in Table L, and E^, E^ are coefficients 
of the gravitational displacement. 
The quantities c and / are corrections to zero, depending on the setting of the scale 
plate on the plate measured, a. and e are differences of scale value, wliile 6 and d depend 
mainly on the orientation of the two plates. The quantity a denotes the deflection at 
unit distance {i.e., 50' from the sun’s centre), so that aE_j and aE^ are the deflection in 
Id.A. and Decl. respectively of a star whose co-ordinates are x and y. 
The left-hand sides of the equation for the. seven stars shown are :— 
No. 
Right Ascension. 
Declination. 
11 
c-0 • 160&—1 • 261O-0 • 587a 
/-I - 26ffi-0 - 160e+0 - 036a 
5 
c-1-1076-0-160a-0-557a 
/-O - UOd—1 - 107e—0 - 789a 
4 
c+0 • 4726+0 • 334a-0 • 186a 
/+0-334£Z+0-472e+l-336a 
3 
c+0-3606+0-348a—0-222a 
/+0 - 348(?+0 - 360e+l - 574a 
6 
c+1 -0996+0 •587a+0-080a 
/+0 - 587(^+l - 099e+0 - 726a 
10 
c+1 - 3216+0 ■ 880a+0 - 158a 
/+0 - 860£Z+ 1 - 321e+0 - 589a 
2 
c-0 - 3286+1 - 079a+1 - 540a 
/+1 - 079c^-0 - 328e-0 - 156a 
20. Normal equations formed from these equations of condition are as follows :— 
Table III.—Eclipse Plates—Eight Ascension. 
I. 
II. 
III. 
IV. 
V. 
VII. 
VIII. 
+ 7-000c +1-6576 
+ l-787a 
+0-226a 
= 
+2-159 
+2-986 
+3-250 
+2-461 
+2-185 
+3-263 
+2-648 
+4-664 
+2-089 
+0-335 
= 
-0-063 
+0-986 
+ 1-320 
+ 0-866 
+ 1-051 
+ 1-464 
+ 1-130 
+4-094 
+2-534 
= 
+ 1-034 
+ 1-689 
+ 1-866 
+ 1-469 
+ 1-480 
+ 1-972 
+1-723 
+3-142 
= 
+0-712 
+0-919 
+0-924 
+0-860 
+ 0-844 
+0-930 
+0-973 
+4-2716 
+ l- 666 a 
+0-281a 
= 
-0-575 
+0-278 
+0-550 
+0-283 
+0-533 
+0-691 
+0-502 
+3-683 
+ 2-476 
= 
+0-483 
+0-928 
+ 1-037 
+0-841 
+0-923 
+ 1-140 
+1-048 
+3-135 
= 
+0-643 
+0-823 
+0-820 
+0-781 
+0-774 
+0-826 
+ 0-888 
+2-988a 
+2 - 366a 
— 
+0-707 
+0-820 
+0-822 
+0-731 
+0-715 
+0-871 
+0-852 
+ 3-116 
= 
+0-681 
+0-805 
+0-784 
+0-762 
+0-739 
+0-780 
+0-855 
+ l-242a 
= 
+ 0-121 
+0-156 
+0-133 
+0-183 
+0-173 
+0-090 
+0-180 
a 
= 
+0-098 
+0-126 
+ -107 
+0-148 
+0-140 
+0-073 
+0-145 
a 
= 
+0-158 
+0-174 
+0-189 
+0-127 
+0-128 
+0-233 
+0-169 
6 
= 
-0-203 
- 0-011 
+0-048 
+0-007 
+0-042 
+0-066 
+0-042 
