Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 258
it is simply used for determining the transit ofstars over the meridian. It consists essentially of a tele-scope mounted on trunnions, like a cannon, having inthe eyepiece, not simple cross wires, but a system ofwires, to which reference has already been made, so thatthe mean of as many… … Fig. 112.—Tycho Bialies Mural Quadrant. a circle on the instrument called the transit circle, ofwhich for the present we defer consideration. 230 STxVRGAZlNG : PAST AND PRESENT. [liOOK IV Now there are three tilings to be done in order toadjust this instrument for observation. In the first place
Astronomy · Telescopes
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