the companion of 95 Ceti was discovered. Upon reporting this to Mr. 

 Dawes, he expressed a wish to possess the glass, but to test its qualities 

 further -sent me a list of Struve's difficult double stars, wishing me to ex- 

 amine them which I did and furnished him with such a description of 

 them as satisfied him that they were well seen." 53 Clark reluctantly sold 

 this telescope to Dawes in March 1854 for $950. 54 Dawes used it for two 

 years, mainly for observations of Saturn, and publicly declared it decid- 

 edly superior in illuminating and separating power to his old favorite, a 

 Munich 6/3-inch refractor. 55 William Lassell was "astonished" by the 

 quality of this telescope. 56 This lens was later used by Frederick Brodie 

 (q.v.) and Wentworth Erck (q.v.). 



The tube Clark made for this telescope was novel and successful enough 

 to merit a description in the pages of the Monthly Notices. It was con- 

 structed of a sheet of zinc covered with brown paper; and although only 

 %o-inch thick, the tube was "remarkably solid and hard to the touch." 57 

 When he sold the 7/2 -inch lens to Brodie, Dawes kept the tube and 

 used it to carry another Clark lens. 



In October 1855 Clark sent Dawes a second telescope — of 8 inches 

 aperture and 10 feet focal length — which Dawes found as praiseworthy 

 as the first. 58 Dawes used it for a few years but found it inconveniently 

 long for his dome. It did its finest work in the hands of William Huggins 

 (q.v.) , to whom it was sold in 1858 for £200, the same price it had cost 

 Dawes originally. 



Dawes asked Clark to replace this lens with one of the same aperture, 

 but shorter focus, and make a complete equatorial mount with clock 

 drive. The new lens was almost completed when, during testing, Clark 

 dropped and broke it. Nothing daunted, Clark immediately ordered 

 another pair of discs from England ; before they arrived, however, he had 



53 Autobiography of Alvan Clark published, among other places, in Sidereal 

 Messenger, vol. 8 (1889), p. 114. 



54 Elias Loomis, Recent Progress of Astronomy (New York, 1856), pp. 390-391. 



55 William R. Dawes, "On the Telescopic Appearances of Saturn With a 7%-inch 

 Object-Glass," Monthly Notices, Royal Astronomical Society, vol. 15 (1854- 1855), PP- 

 79-80. 



56 Elias Loomis, Recent Progress of Astronomy, p. 391. 



57 Frederick Brodie, "Notes on the Manufacture of Tubes for Refracting Tele- 

 scopes," Monthly Notices, Royal Astronomical Society, vol. 17 (1 856-1 857), p. 35. 



68 William R. Dawes, "Telescopic Appearances of the Planet Saturn," Memoirs, 

 Royal Astronomical Society, vol. 26 (1858), pp. 9-18. 



52 



