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 370
the tube. The realsize of this eye-piece is much about the same asthat represented in the figure. When applied toan achromatic telescope of 44^ inches focal dis-tance it produces a magnifying power of 36 times,and exhibits a very beautiful view of the whole ofthe full moon. It likewise presents a… … C JB within the sliding tube which receives the eye-piece, or immediately below it. The part of thetube at AB slides into the tube of the telescope,CD is the speculum placed at half a right angleto the axis of the tube, and EF, the tube con-taining the lenses, which stands at right angles tothe…
Astronomy · Astronomical instruments · Telescopes
Internet Archive · Getty Research Institute · Public Domain Mark 1.0. Free to use for anything.
