Refracting Telescope
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“The most simple refracting telescope consists of a tube, containing two convex lenses, the one having a long, and the other a short, focal distance.” -Comstock 1850
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Telescopes and BinocularsSource
J. L. Comstock A System of Natural Philosophy: Principles of Mechanics (: Pratt, Woodford, and Company, 1850) 253
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