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 256
till theyarrive at its focus, about A, where an image of theobject is formed; they then proceed diverging tothe eye-glass, where they are rendered parallel,and enter the eye in that direction. Fig. 50 re-presents the rays as they converge and diverge inpassing through the four glasses of the… … diverge towards the first eye-glass where they arerendered parallel; and passing through the secondeye-glass, they again converge and form a secondimage at C; from which point they again diverge,and passing through the first eye-glass enter theeye in a parallel direction. If the glasses of…
Astronomy · Astronomical instruments · Telescopes
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