Draper, Henry, 1837-1882.
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.
Reflecting telescopes.
Astronomical photography.
Mirrors.
Ritchey, G. W. (George Willis), b. 1864.
Smithsonian Institution. Publication 1459.