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Scientific American, Vol. 42, No. 24 (1880) (1880)
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on as its focal length is short in comparison with the width of its ob- greater than that length they could not be adjusted so as to see a single star, and that jective or object glass. In such telescopes an BINOCULAR COMET SEEKER. when directed to a single star such an object would be visible… … brilliancy of image, in the case of the bino- structed. Both eye pieces may be used toge- enlar, is increased to twice the original quan. BINOCULAR TELESCOPE, WITH MICROSCOPIC OBJECTIVES. ther by a single observer, or by their proper © 1880 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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