Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 99
i. the smaller ones consist of a brass tube, the object-glass held in a brass ring screwed in at one end of thetube and a smaller tube carrying the eyepiece slidingin and out of the large tube and sometimes movedby a rack and pinion motion, at the other. The largerones as mounted for special uses… … Fig. 39.—Diagi-am Explaining the Magnifying Power of Object-glabs. moon to look at, and a powerful lens to see that image. Bystudying Fig. 39 the fundamental condition of producinga large image by a lens will be seen. Suppose we wishto look at an object in the heavens, the diameter of whichis one…
Astronomy · Telescopes
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