Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 218
ry large and fine instruments have been constructedupon this plan. That in the Naval Observatory at Wash-ington, with an aperture of twenty-six inches is one of thefinest. 720. The Terestial Telescope, Fig. 243, has two additional lenses.* ♦Sometimes three are used, two doing the work of one 208… … Fig. 243. those proceeding from the lower part at a point H, midway betweenthis lens and the next, Q. The second lens brings the rays oflight from each part to a focus once more at a b, thus placing thisimage in the same position as the object. This image is then mag-nified by the eye piece E, as…
Physics
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