Astronomical Society went to Cambridgeport to buy the lens. The as- 

 tronomers at Harvard College Observatory, also eager to obtain this 

 lens, had already begun a campaign for the necessary funds; they accel- 

 erated their efforts when they learned of the Chicagoans' intent. The 

 Chicagoans arrived just after Alvan Clark had set out to close the deal 

 with George P. Bond; they ran after him, so the story goes, money in 

 hand. It is related that Clark, desirous of keeping the lens in Cambridge, 

 suggested they purchase the Harvard 15-inch instead. The Chicagoans' 

 ready money won out. They bought the lens for $11,187, slightly less 

 than the Harvard 15-inch Munich object-glass had cost. 68 



The Clarks made a German style equatorial mount for the 18^-inch 

 lens, which brought the total cost of the instrument to $18,187. They 

 erected it in a tower of the old University of Chicago (q.v. ) in the spring 

 of 1866. That June Alvan Clark received an honorary M.A. from Chi- 

 cago. 69 After twenty years of fires and financial panics, and the demise of 

 the University, the telescope was moved to Northwestern University 

 (q.v.). In 191 1 the lens was remounted by Warner & Swasey. The 

 original mount and wooden tube are now on exhibit at the Adler Plane- 

 tarium in Chicago. 



F. J. del Corral, astronomer at the Hathorn Observatory at Saratoga 

 Springs, New York, observed the planets with a 6-inch Clark refracting 

 telescope of 1883. 70 



In the Chamberlin Observatory at the University of Denver there 

 is a 20-inch lens figured by Alvan Graham Clark and mounted by Fauth 

 & Co. by 1894. Patterned after the experimental 13-inch Boyden telescope 

 of the Harvard College Observatory (q.v.), the Denver instrument can 

 be used for either visual or photographic work. For the latter, the crown 

 lens of the objective is reversed from its visual position and separated from 

 the flint lens by several inches. 71 



The McKim Observatory of De Pauw University in Greencastle, 

 Indiana, was opened in 1885. The equatorial telescope, mounted by 



68 Annals, Dearborn Observatory of Northwestern University, vol. 1 (1915), introduction. 



69 University of Chicago Catalogue (1866). 



70 William H. Knight, "Some Telescopes in the United States," Sidereal Messenger, 

 vol. 10 (1891), pp. 398-399. See also Sidereal Messenger, vol. 10 (1891), p. 152. 



71 H. A. Howe, "The 20-inch Equatorial of the Chamberlin Observatory," 

 Astronomy and Astrophysics, vol. 13 (1894), pp. 709-714. 



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