electric drive to replace the original gravity-driven one, the telescope has 

 not been altered since it was made by the Clarks in 1880. 



In 1872 Columbia College, in New York City, built a small astro- 

 nomical observatory for educational and scientific work. It was furnished 

 with a 6-inch aperture equatorial refractor, moved by clockwork, and 

 an astronomical spectroscope, both made by the Clarks. The spectro- 

 scope held 7 heavy flint glass prisms through which light passed twice. 40 

 Columbia has been credited with several other 19th-century Clark in- 

 struments as well. J. K. Rees, then director of the Columbia observatory, 

 viewed the 1882 Transit of Venus through a Clark 5-inch equatorial 

 refractor moved by clockwork and "similar in all respects to the instru- 

 ments made for the Transit of Venus expeditions of 1874" (q.v. ) . 41 And, 

 according to an inventory of large telescopes, published by the Sidereal 

 Messenger in 1884, there was then an 11 -inch Clark refractor at 

 Columbia. 42 



The national Argentinian observatory at Cordoba, founded by Ben- 

 jamin A. Gould in 1870, had two pieces of Clark apparatus. One was an 

 equatorial mount for the 1 i-inch photographic lens made by Lewis Mor- 

 ris Rutherfurd — and not by Henry Fitz as has been often stated — in 

 1864; 43 this mount was clock driven and provided with a position circle 

 micrometer. The other Clark instrument at Cordoba was a 5-inch 

 equatorial refractor equipped with finely divided circles, but without 

 clockwork. 44 



Cornell University built a temporary astronomical observatory in 

 1888. Among the original, and now misplaced, instruments was a 

 4 5/2 -inch Clark equatorial refractor. 45 



Charles A. Young at Dartmouth College relied on the Clarks to 

 make the apparatus for his studies of the solar spectrum. He apparently 



40 Catalogue of the Officers and Students of Columbia College, for the Tear i8y 2- 1873 

 (New York, 1872), pp. 107-108. See also, "Size of the Principal Telescopes in the 

 World," Popular Science Monthly, vol. 10 (1876-1877), p. 576. 



41 J. K. Rees, "Observations of the Transit of Venus, December 6, 1882," Annals, 

 New York Academy of Sciences, vol. 2 (1880-1883), pp. 384-390. 



42 [William W. Payne], "Large Telescopes of the World," Sidereal Messenger, vol. 3 

 1884), p. 194. 



43 Lewis M. Rutherfurd, "Astronomical Photography," American Journal of 

 Science, vol. 39 (1865), pp. 304-309. 



44 Resultados del Observatorio Nacional Argentino in Cordoba, vol. 2 ( 1 88 1 ), pp. xiii, lxiii. 



45 The [Cornell] Register (1888-1889), P- 35- 



48 



