Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 259
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 … we must see that the line of sight is exactly at rightangles to the axis on which the telescope turns, and when CHAP. XVI.] THE TRANSIT CIRCLE. 237 we have satisfied ourselves of that, we must, in thesecond place, take care, not only that the pivots on whichthe telescope rests are perfectly equal…
Astronomy · Telescopes
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