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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.

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Washington, Smithsonian Institution, 1904.

1904

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