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 584
a machinery within the observersreach, but which a child may work. When thetelescope is about half an hour east of the meri-dian, the galleries, hanging over the gap betweenthe walls, present to a spectator below an appear-ance somewhat dangerous 5 yet the observer, with EARL OF ROSSEs TELESCOPE.… … The above figure represents only the upperpart of the tube of the telescope, at which theobserver stands when making his observations.The telescope is at present of the Newtonian con-struction, and consequently, the observer looksinto the side of the tube at the upper end of thetelescope, but it is…
Astronomy · Astronomical instruments · Telescopes
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