fying from ioo to 800 diameters. The mount was provided by the Rev. 

 H. G. Sedgewick of Davenport, Iowa. 102 



Phoebe Haas, of Philadelphia, received a 4-inch Clark refractor from 

 William Tyler Olcott (q.v.), and then passed it on to the American As- 

 sociation of Variable Star Observers (q.v. ) . 



The first of George Ellery Hale^s great telescopes was a 4-inch 

 Clark refractor given to him by his father in time for observations of the 

 1882 Transit of Venus. When the Kenwood Physical Observatory was 

 furnished, nine years later, the new Warner & Swasey equatorial mount 

 was made strong enough to carry the small Clark telescope as well as the 

 12-inch Brashear refractor. 103 



The Hartford Public High School in Connecticut has had an excel- 

 lent g /o -inch Clark objective, equatorially mounted by Warner & Swasey, 

 since 1884. 104 A Hartmann test applied to the objective in 1930 gave a 

 T-value of only 0.18. An accompanying diagram shows, in the author's 

 words, the astigmatism, "or rather, the lack of astigmatism" of the lens, 

 in thousandths of an inch. 105 



Harvard College Observatory, within a few miles of the Cam- 

 bridgeport factory, was advantageously located, and there is ample evi- 

 dence that the Harvard astronomers relied on the Clarks for many of 

 their astronomical instruments. The observatory's annual reports, for in- 

 stance, refer to work done by the Clarks: a new comet seeker, a new 

 solar eyepiece, cleaning lenses, devising new modes of illumination for 

 micrometer wires, etc. The report for 1 892 went so far as to note the death 

 of George Bassett Clark and to pay tribute to his "genius for mechanical 

 devices, indomitable perseverance, and devotion to the interests of the 

 observatory." 106 



102 Proceedings on the Reception of the Jacob Haish Telescope, June ig, 1888 (Grinnell, 

 Iowa, 1888), p. 1. 



103 George Ellery Hale, "The Kenwood Physical Observatory," Sidereal Messenger, 

 vol. 10 (1891), pp. 321-323. 



1,14 "The Hartford High School Telescope," Sidereal Messenger, vol. 3 (1884), pp. 

 147-149. 



105 E. Harold Coburn, Quality of H.P.H.S. Telescope Objective, Hartmann Test 

 (manuscript copy at Hartford Public High School). 



106 Annual Report, Harvard College Observatory, vol. 47 (1892), p. 3. 



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