Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 321
s a discof metal, c; again on this disc lies another disc, A, b,which can revolve round on c, being held to it by acentral stud, so that when a b is in the plane of theearths equator its axis points to the pole and is parallelto the axis of the earth. On the upper disc thereare two supports for the… … Fig. 137.—Simjile Eijuatoiial Mounting. In the equatorial mounting, clockwork is introduced,and after the instrument has been pointed to Siuy par-ticular star or celestial body, the clock is clamped tothe circle moving round the polar axis, and so madeto drive it round in exactly the time the earth…
Astronomy · Telescopes
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