Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 361
Fm. 151.-Dome. Fig. 152.—Drum. groove resting on them. A small roof, if carefully made,may be pulled round by a rope attached to any part of )li,ima.flfl. … Fig. 153.—New Cincinnati Observatory—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…
Astronomy · Telescopes
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