On the Construction of a Silvered Glass Telescope, Fifteen and a Half Inches in Aperture, and Its Use in Celestial Photography, by Henry Draper. (Reprinted From Vol Xiv, "Smithsonian Contributions to Knowledge," 1864); And, on the Modern Reflecting Telescope and the Making and Testing of Optical Mirrors, by George W. Ritchey.

doi 10.5962/bhl.title.32723
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Smithsonian Institution,


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