STELLAR PHOTOMETRY. 
+ I m + 3C S 
N 
OS 
PLATE 12 . 
- HOS 
-h IO' 
' + . 
o 
— 5 ' 
■i— io 
Scale, i mm= 7". 2. 
1902 January 13. 
8518 Z Cassiopeia. 
R. A. 23I1 39m 39S.9. Dec. + 56° i' 33", 190c. 
