176 Prof. C. Pritcharcl. On the Capacities of two [May 3, 



Subsequently to the above operation it was thought well to examine 

 a pair of stars on the same plates, which happened to fall near the 

 angles, viz., at (x) and (z), impressions of the same pair as those at y. 

 The distance of (x) and (z) from the centre of the plate was approxi- 

 mately 63', but it must be added that the impressed disks were* 

 slightly elliptical. The resulting distances between the stars of 

 these three pairs were as follows : — 



x. y. z. 



Plate I 176-53.... 17611 ../. 176 V 35 



IT 617 .... 6-10 .... 176-29 



III 6-22 .... 6-64 .... 176-15 



Examination of the Field of the j~-inch Mirror. 



The photographic plate here is nearly 3 inches square, subtending 

 an angle of 1° 56'. The pair of stars selected consisted of Atlas and 

 Pleione, and these by the motion of the telescope were made to occupy 

 successively the positions indicated in the subjoined diagram, which 

 will be understood from the description of the former. The tables 

 are arranged on the same plan. 



Fig. 2. 







N~orth 













• 











i 31' 





East 



\cl39 





\c 32' 



West 







',65/ 



./>?': 















Sot&th. 







