Page 408 - 89 history of astronomy_opt

up in 1805, and soon produced, among oth-
ers, Struve’s Dorpat refractor of 9.9 inches
diameter and 13.5 feet focal length, and an-
other, of 12 inches diameter and 18 feet fo-
cal length, for Lamont, of Munich.
In the nineteenth century gigantic reflectors
have been made. Lassel’s 2-foot reflector,
made by himself, did much good work, and
discovered four new satellites. But Lord
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