Investigations representing the departments. Astronomy and astrophysics .. (1903)
University of Chicago · Chicago : The University of Chicago Press · leaf 428
y. The faintest stars shown on the originalnegative are about two magnitudes fainter than those which are at the visual limit of the forty-inchrefractor. I am indebted to Mr. F. G. Pease for able assistance in securing the reflector photographs, andin preparing all of the pliotogi-aphic… … Laroe DouBLf:-SLiDE Plate-Cariuek Attached to Forty-Inch Refractor
Astronomy
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