Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 362
ervatory—Front elevation, showin.r; exterior of Drum. it, but large ones generally have a toothed circle insidethe one on which the roof is built, or this circle itself is I CHAP. XXII.] THE EQUATORIAL OBSERVATORY. 339 toothed, so tliat a pinion and hand-winch can gear into itand wind it round. If… … Fig. 154.—Cambridge (U.S.) Equatorial, showing Observing Chair and raiLs. shop-window shutter, and slides in grooves on either sideof the opening. The equatorial and the building to contain it have nowbeen described, but there is another piece of apparatuswhich is required as much as any adjunct to…
Astronomy · Telescopes
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