Terrestrial Telescope

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“The spy-glass or terrestrial telescope avoids the inversion of the image by the interposition of two double-convex lenses, m and n, between the objective and eyepiece. The rays diverging from the inverted image at I cross between m and n, and form an erect magnified, virtual image at ab.” — Avery, 1895


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


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