type of telescope has of late years come into ing theories of a critical nature, and the names of means of which so many brilliant astronomical discov- Gauss, Littrow and others must always be associated prominence as an " astronomical weapon," i. e., the ries have been made. This instrument, as… … with the ordinary telescopic method, even now living, Mr. Alvan G. Clark, who has ASTRONOMICAL PHOTOGRAPHIC CAMERA, WITH DOUBLE OBJECTIVE, though the path of the stars should cross recently finished the great objective of the FOR WIDE FIELD PHOTOGRAPHY. the field of vision at any angle, the…
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