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 289
r, although the telescopebe raised to any altitude—the elevation being en-tirely at the object end, although it may be changedfrom the horizon to the zenith. The frame-workis composed of bars of mahogany, and rests onthree castors, two of which are made fast to theirrespective legs in the usual… … it becomes very inconvenient to stoop to the eyeend of a telescope, when the altitude of anobject is considerable, and the centre of motion atthe middle of the tube, this construction of astand serves to remedy such inconvenience, NOTICES OF ACHROMATIC TELESCOPES. 265 Proportions of curvature of…
Astronomy · Astronomical instruments · Telescopes
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