Natural philosophy. being a hand-book of chemical physics, or, The physics of heat, light and electricity (1869)
Sangster, John Herbert, 1831-1904 · Montreal : J. Lovell · leaf 134
number ofthe rays emitted by a distant object, and transmits them to the eye in thecondition required for distinct vision. 311. The Terrestrial Telescope differs from the Astronomicalmerely in having two additional lenses for the purpose ofrefracting the image to the eye in an erect position. The… … image, but it, at the same time, renders the rays convergent; the secondlens, G H, throws these rays into a state of parallelism, and they reach theeye in the condition requisite for distinct vision. 312. Reflecting Telescopes are of various forms, and arenamed after their inventors. They are used…
Physics
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