before his death Alvan Graham accompanied Lowell and his daughter 

 to Amherst to visit mutual friends. 163 



The Mare Island Naval Observatory, in a shipyard in San Fran- 

 cisco, was established by the U.S. Navy for the purpose of rating chronom- 

 eters and supplying standard time to the West Coast. By 1 899 it housed 

 a Clark 5-inch equatorial refractor (#861) mounted on a substantial 

 pier. 164 After the demise of the observatory in 1930 the telescope was 

 probably sent — or returned — to the U.S. Naval Observatory in Wash- 

 ington (q.v. ). 



In September 1891 E. S. Martin, at Wilmington, North Carolina, 

 observed a transit of Jupiter's third satellite with a 5-inch refractor he 

 had just received from Messrs. Alvan Clark & Sons. 165 



Tasker H. Marvin, of Palisades, New York, had a 5-inch Clark 

 refractor by 1868. His friend and neighbor, Winthrop Gilman (q.v.), 

 was able to see the 1 6th magnitude companion of 1 1 o Herculis with 

 this splendid glass. 166 



The Massachusetts Institute of Technology, located in Cam- 

 bridgeport, was within a few blocks of the Clark workshop. By 1878 

 the M.I.T. department of physics had at least one instrument made by 

 the Clarks — a spectrometer. Like the instruments at Dartmouth and 

 Harvard (qq.v. ), this one held five 6o° prisms and one 30 prism 

 silvered on its rear surface; and it used the same telescope for both the 

 collimator and viewing telescope. 167 



Robert White McFarland, a mathematician at Columbus, Ohio, 

 had a 5-inch Clark equatorial by 1880. 168 



163 "Alvan Graham Clark," The Cambridge Chronicle 12, June 1897. 



164 Everett Hayden, "Brief Account of the [Mare Island] Observatory," Publica- 

 tions, Astronomical Society of the Pacific, vol. 11 (1899), p. 112. 



165 Sidereal Messenger, vol. 10 (1891), p. 431. 



166 Winthrop S. Gilman to Joseph Winlock, 18 July 1868 (letter in Observatory 

 Papers, Harvard University Archives). 



167 "List of Apparatus Relating to Heat, Light, Electricity, Magnetism, and 

 Sound, Available for Scientific Researches Involving Accurate Measurement," 

 Annual Report . . . Smithsonian Institution . . . 1878, p. 437. See also Wolcott Gibbs, 

 Report on Physical Apparatus and Chemical Materials Suitable for Scientific Research (Wash- 

 ington, D.G., 1876), p. 8. 



168 Edward S. Holden, ed., "Reports of Astronomical Observatories," Annual 

 Report . . . Smithsonian Institution . . . 1880, p. 636. 



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