CATALOGUE OF STARS WITHIN 
TABLE I. 
Thermoni. 
1 
Plate 
1895- 
Ob- 
server. 
Barom. 
Length 
of Ex- 
posure. 
E 
Ex 
nd of 
posure. 
a 
5 
Attached 
R. 
External 
R. 
mm 


VI s 
h 
m 
s 
h 
m 

/ 
Sept. 16 
D. 
757-2 
+ 8.4 
+ 7-8 
6 
22 
48 
56 
22 
24 
89 

no. 2 
3 
20 
52 
53 
50 
51 
Sept. 16 
D. 
757-2 
-t- 8.2_ 
+ 7-5 
6 
23 
32 
50 
22 
24 
91 

no. 4 
3 
20 
36 
37 
40 
46 
(10 
24) 
(89 
o)' 

Sept. 16 
Dr. 
756.85 
+ 8.2 
+ 7-4 
6 

ID 
33 
I 
24 
91 
no. 5 
3 
20 
14 
15 
13 
9 
(13 
24) 
(89 
0) 
Sept. 16 
Dr. 
756.2 
+ 8.0 
+ 6.9 
6 

43 
13 
I 
24 
89 

no. 7 
3 
20 
46 
47 
47 
53 
Sept. 18 
D. 
751-2 
+ 9.0 
+ 8.4 
6 
20 
22 
6 
19 
24 
89 

no. I 
3 
20 
25 
26 
45 
40 

vSept. 18 
D. 
751-3 
+ 8,5 
-t- 8.0 
6 
20 
57 
47 
19 
24 
91 
no. 3 
3 
20 
21 
I 
2 
19 
52 
(7 
24) 
(89 
0) 
Sept. 21 
Dr. 
764-4 
+ 2.7 
-h 2.2 
6 
3 
2 
2 
4 
24 
91 

no. 13 
3 
20 
5 
6 
34 
26 
(16 
24) 
(89 
0) 
Sept. 21 
Dr. 
764.6 
+ 2.5 
+ 2.0 
6 
3 
33 
56 
4 
24 
89 

no. 15 
3 
37 
37 
20 
38 
21 
D. Donner. 
Dr. Dreyer. 
11. 
Measurement and Reduction; Preliminary Catalogue. 
After some trial it seemed advisable to use both vertical and horizontal 
threads in measuring the rectangular coordinates of the star images. Thus 
both the X and Y coordinates were determined in the same position of the 
plate. It was also decided to set upon both corners of the reseau square at 
once, thus reducing greatly the number of micrometer readings. It was not 
possible to set upon the lines as is customary, since for the most part they 
were too indistinct. Otherwise the method of measuring and recording is the 
same as that described in Publication i, Sec. 11 and III. Six plates were 
measured by Dr. Furness and two by Miss Elise Whitney. The coordinates 
of the standard stars were measured by both observers. Corrections were 
made for errors of the screw, for the reseau and for error of runs. Table II 
which follows contains the corrected coordinates of the two sets of images 
measured on each 89° plate. It also contains the coordinates of certain 
stars on the 90° plates which have a polar distance greater than 1° and hence 
are not included in the catalogue of sixty-five stars found in Publication i. 
