. Bulletin - United States National Museum. Science. Figure 23.—Spectroscope made by Alvan Clark & Sons in 1877 for use with the 9-inch refracting telescope at Princeton University. As shown here, the spectrum is formed by a Rutherfurd diffraction grating, but the instrument was also equipped with a glass prism for this purpose. The spectroscope is now in the collections of the Smithsonian Institution. The drawing is from Charles A. Young, The Sun (New York, 1896), fig. 18, p. 69. Willets Point, New York Harbor. In 1880 they acquired an equatorial refracting telescope made by Fauth & C
. Bulletin - United States National Museum. Science. Figure 23.—Spectroscope made by Alvan Clark & Sons in 1877 for use with the 9-inch refracting telescope at Princeton University. As shown here, the spectrum is formed by a Rutherfurd diffraction grating, but the instrument was also equipped with a glass prism for this purpose. The spectroscope is now in the collections of the Smithsonian Institution. The drawing is from Charles A. Young, The Sun (New York, 1896), fig. 18, p. 69. Willets Point, New York Harbor. In 1880 they acquired an equatorial refracting telescope made by Fauth & Co., with a 5^-inch objective lens figured by the The Military Academy at West Point, New York, acquired a Fitz equatorial refractor of 9% inches aperture in 1856; in 1875 the Clarks reworked the objective of this instrument at a cost of $ In 1883 the West Shore Railroad, which had run a tunnel directly under the old observatory, built a new observatory for the cadets. The following 2I?a J. H. Willard, Practical Astronomy at the Engineer School of Application at Willets Point, N. T. H., 1881 (Willets Point, 1882). 219 Alvan Clark to Peter S. Michie, 1 September 1875 (letter in Military Academy Library). 96. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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