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 536
rected toany point of the celestial canopy, except a smallportion near the northern horizon, which ispartly intercepted by a small hill. In the follow-ing ground-plan, fig. 91. AAA, is the parapetsurrounding the observatory-room; BBB, a walkaround it nearly 3 feet broad, covered with lead.O is the… … South 512 THE PRACTICAL ASTRONOMER. is obtained to the open area on the outside. GHIis an area on the outside towards the south,covered with lead, 15 feet long from Gr to H, and6^ feet from E to I, from which a commandingview of the southern, eastern and western por-tions of the heavens may be…
Astronomy · Astronomical instruments · Telescopes
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