The practical astronomer : comprising illustrations of light and colours, practical descriptions of all kinds of telescopes, the use of the equatorial-transit, circular, and other astronomical instruments, a particular account of the Earl of Rosse's large telescopes, and other topics connected with astronomy (1845)
Dick, Thomas, 1774-1857 · London : Seeley, Burnside, and Seeley · leaf 381
ON THE EYE-PIECES OF TELESCOPES. 357 most part crossed glasses, that is ground on toolsof a long focus on the one side, and to a shortfocus on the other. The construction of the eye-piece of the Dutch telescope above described, isone which might be adopted with a good effect inmost of our…
Astronomy · Astronomical instruments · Telescopes
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