Reflecting Telescope

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“The reflecting telescope has an objective a concave mirror, tecnically called a speculum. The images formed by the speculum are brought to the eyepiece in several different ways. Sometimes the eyepiece consists of a series of convex lenses placed in a horizontal tube.” — Avery, 1895


Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 408


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