Astronomical Photography with the Forty-Inch Refractor and the Two-Foot Reflector of the Yerkes Observatory (Classic Reprint)

IN the original design of the forty-inch refractor of the Yerkes Observatory no provision of any kind was made for direct photography. The objective is a visual one; there is no photographic cor rector such as was provided for the great Lick refractor; and there is no powerful auxiliary telescope for guiding, such as are used in the cases of the standard photographic telescopes and of the very large photographic refractors at Potsdam and Meudon.

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