Figure. 14. — William Rutter Dawes (1 799-1868), 

 correspondent, client, and friend of Alvan Clark. 

 Courtesy Wellesley College Observatory. 



a trained engineer, Mr. Dawes found in him one who was ready to adopt 

 and incorporate in an instrument any feature he might desire, and who 

 would follow his multiplicity of minute directions with the most scrupu- 

 lous accuracy." r ' 2 All in all Dawes purchased and used five different 

 Clark instruments. 



The first is well described in Alvan Clark's own words: "In 1853 I 

 had finished a glass of seven and one half inches aperture, with which 



52 Simon Newcomb, "The Story of a Telescope," Scribner's Monthly, vol. 7 (1873- 

 1874), p. 46. 



51 



