Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 136
er at pleasure. It is done in this way : The sizeof the image a V depends upon the relation of thedistances a b and e a, which can be varied by alteringthe distance of the combination of the lenses B and e,from the image a b, and so making a V larger and ata focus further from E; the tube carrying… … Fio. 63.—Erecting or day eyepiece. Huyghenian eyepiece in place of the single lens, aremarked divisions, showing the power of the eyepiece whendrawn out to certain lengths, so that if we want theeyepiece to magnify say 100 times, the tube carryingthe eye-lens is drawn out to the point marked 100,…
Astronomy · Telescopes
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