Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 140
e most important scientificdiscoveries ever made. Construction of the Telescope.—Long before the time ofGalileo glass lenses had been used for spectacles. TheEmperor Nero (died a.d. 68) is said to have employedsuch a lens. It was found that a double-convex lens madeout of glass not only collected… … Fig. 66.The reading-glass C magnifies an object AB to the size ab. magnifies. AMB is an object viewed by a reading-glassC. From every point of the object AB rays of light issue,and they go in every direction. (The proof of this fact isthat no matter where you stand you can still see AB; andif you…
Astronomy
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