The Boston school compendium of natural and experimental philosophy .. (1837)
Parker, Richard Green, 1798-1869 · Boston : Marsh, Capen & Lyon · leaf 158
es. It will be seen by the figure that the im-age is inverted; for the ray M A, after refraction, will be seen inthe direction C O, and the ray N B, in the direction D P. Fig. 114 represents a day glass or terrestrial telescope, common-ly called a spy glass. This, likewise, consists of a tube,… … shape, and placed at equal distances from each other, in such a man-ner that the focus of the one meets that of the next lens. Thesetwo eye glasses, E F and C D, are introduced for the purpose of col-lecting the rays proceeding from the inverted image M N into anew upright image, between G H and E…
Physics
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