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“Sextant. An important instrument of navigation and surveying, for measuring the angular distance of two stars or other objects, or the altitude of a star above the horizon...” a, handle; b, c, mirrors; d, ring; e, telescope; f, arm; g, reading-lens; h, arc; i, screw; j, tangent screw. -Whitney, 1911


William Dwight Whitney The Century Dictionary: An Encyclopedic Lexicon of the English Language (New York, NY: The Century Co., 1911)


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