Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 381
SENT. [book v. not only able to determine the various measurements ofthe diameter of the outer ring by one edge of the ringfalling on one of the fine wires, and the other edge onthe other wire, but, by the position circle outside themicrometer we can determine exactly how fur we havemoved that… … Fig. 160.—The Deternihuition of the Angle of Po.sitioii of the axis of Satuvus Ring. ascertain the position of spots on the surface,, andthe rate of their motion and change. The lunar cratersrequire mapping, and their distances and bearing fromcertain fixed points measuring, for this then the…
Astronomy · Telescopes
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