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75

June 23, 1896

Measurements of 8 inch Draper plates taken with Iceland spar prisms, to determine correction to be applied to photographic scale held in measuring 8 inch Bache an 8 inch Draper plates.

Plate I 15250
1  a 5.4^[[= 5.7]]5.7
   b 5.9^[[=6.2]]6.3
   c 6.5^[[=6.8]]6.8
   d - 7.6
   e - 7.8

2  a - 7.7
   b - 7.5
   c - 8.1
   d - 8.5
   e - 8.5

3  a 5.5^[[=5.8]]5.7
   b 5.9^[[=6.2]]6.3
   c 6.5^[[=6.8]]6.9
   d 7.3^[[=7.6]]7.7
   e - 7.8

4  a - 7.6
   b - 7.5
   c - 7.9
   d - 8.4
   e - 8.3

John G. Wolbach Library, Harvard-Smithsonian Center for Astrophysics · Provided by the NASA Astrophysics Data System