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 219
white table at T, around whichseveral spectators may stand, and view the pic-ture, as delineated on a horizontal plane. Thereflector, along with its case, is capable of beingturned round, by means of a simple apparatusconnected with it, so as to take in, in succession,all the objects which compose… … representation of the object, near the sides, willbe somewhat distorted; to remedy which, the imageshould be received on a concave surface, as ah orPS. This is the general plan of those CameraObscuras, fitted up in large wooden tents, whichare frequently exhibited in our large cities, andremoved…
Astronomy · Astronomical instruments · Telescopes
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