Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 323
escope is represented parallel tothe polar axis, which is inclosed in the casing supported bythe central pillar, and carries one large right ascensioncircle above and another smaller one below, the formerbeing read by microscopes attached to the casing. The socket or tube carrying the declination… … Fig. 138—Cookes form for Rc^fractors, The clock is seen to the north of the pillar. Whilethis is driving the telescope, rods coming down to the CHAP. XX.] METHODS OF MOUNTING LARGE TELESCOPES. 801 eyeiAecQ enable the observer to make any small altera-
Astronomy · Telescopes
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