Figure 19. — Spectroscope with 6/2 prisms twice-tra- 

 versed, made by Alvan Clark & Sons for Charles A. 

 Young at Dartmouth College. Courtesy Dartmouth 

 College Archives. 



Captain Charles Goodall of San Francisco, a donor of the observa- 

 tory and apparatus for the University of the Pacific (q.v. ), had an excel- 

 lent 5-inch Clark achromat of his own by 1 888. 100 



Grand Rapids High School in Grand Rapids, Michigan, loaned its 

 3%-inch Clark achromat to James Craig Watson for observations of 

 the 1870 solar eclipse. Watson, who used the telescope under a variety of 

 circumstances, was convinced its optical properties could not be excelled 

 by any other instrument of that size. 101 



Robert Green, of Mexico, Missouri, owned a 4-inch aperture re- 

 fracting telescope inscribed "Alvan Clark & Sons, Cambridgeport, Mass., 

 1885." His widow gave this instrument to the Central Missouri Amateur 

 Astronomers (q.v.). 101a 



Grinnell College acquired an equatorial refractor in 1888. The 

 Clarks made the 8-inch objective and a battery of four eyepieces magni- 



100 Edward S. Holden, Handbook oj the Lick Observatory (San Francisco, 1888), p. 125. 



101 U.S. Coast Guard Survey Report (1870), p. 130. 



101a Information from W. C. Shewmon of Central Missouri Amateur Astronomers. 



64 



