168 
ANNUAL REPOET SMITHSONIAN INSTITUTION, 1919. 
(2) CoirvpaHson with Oxford plate H^. — The reductions are simi- 
lar and are given in a rather more condensed form below. The 
theoretical plate constants are 
a= +3.8, &, (?= +8.3, e= +38.6. 
star. 
Ax. 
All. 
A21. 
+ 10y. 
AaX. 
All. 
Resid. 
11 
7,290 
6,761 
7,126 
7,320 
7,429 
7,182 
6,680 
6,905 
7,108 
7,147 
7,258 
6,759 
6,959 
7,177 
7,144 
124 
29 
187 
176 
250 
7,134 
6,730 
6,772 
7,001 
6,894 
7,159 
6,756 
6,790 
7,024 
6,893 
+235 
5 
-168 
4 
-134 
3 
+100 
6 
- 31 
Star. 
Ay. 
Aiy. 
-lOr. 
Aay. 
Ej,. 
Aiy. 
Resid. 
11 
1,686 
858 
1,881 
1,785 
1,909 
1,095 
642 
1,015 
961 
779 
- 14 
-124 
-173 
-175 
-199 
1,109 
766 
1,188 
1,136 
978 
+ 6 
-127 
+234 
+272 
+ 136 
1,103 
893 
954 
864 
842 
+172 
5 
- 38 
4 
+ 23 
3 
- 67 
6 
- 89 
The normal equations are 
55/+2.83S% — +1 
2.835/+4.838>ti=-105 
whence 
3.23S)t = —105, 
8%= —33. . 
The corresponding deflection at the limb is 
1.75"_0.31"=:1.44." 
Plate W. 
Although the exposure was only 10 seconds the images have jumped 
in right ascension, 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 right ascension. 
(1) C omparlson loith Oxford plate D^. — Theoretical plate con- 
stants 
a= +4.9, 5, d=z +6.5, e^ +39.7. 
star. 
I. 
Ai. 
All. 
i&z. 
A2I. 
+91y. 
Asi. 
A4X. 
Resid. 
5 
12.40 
17.34 
17.48 
19.87 
22.60 
2,450 
3,948 
3,834 
4,525 
5,199 
2,370 
3,741 
3,634 
4,266 
4,911 
-79 
-54 
-69 
+ 3 
+ 17 
2,449 
3,795 
3,703 
4,263 
4,894 
267 
1,704 
1,602 
2,275 
2,476 
2,182 
2,091 
2,101 
1,988 
2,418 
2,208 
2,109 
2,124 
1,987 
2,412 
+ 40 
4 
— 59 
3 
— 44 
6 
— ISl 
10 
+244 
