Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 265
Mural Circle. The combination of the circle ^Yith the transit, form-ing the transit- or meridian-ciicle, is of comparativelyrecent date, and the earlier method was to use a circle R 242 STARGAZING : PAST AND PRESENT. [book iv. with a telescope attaclied, fixed to a pivot moving onbearings in a… … Fig. 117.—Transit Circle, showing the addition of circles to the transitinstruinent. ■ , Fig. 117 shows in what respect the Transit Circle isan advance upon the transit instrument and the muralcircle, for in addition to the transit instrument we havethe circle. This is a perspective view of the…
Astronomy · Telescopes
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
