Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 324
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- … Yjc,. 139.—Mr. Grubbs form applied to a Cassegvain Eoflector. tions in riglit ascension or declination; indeed m allmodern instruments everything except winding the clock 302 STARGAZING : PAST AND PRESENT. [I-uoK v. is done at the eyepiece, so that the observer when fairlyat work is not disturbed.…
Astronomy · Telescopes
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten20unit-165-60.webp)
