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English equatorial refractor. Refractor mounted on a typical 'English' stand of early 19th century. The observer is using a micrometer and controlling the telescope in declination by means of the slow motion.
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Architectural drawing of the Mount Wilson Observatory dome for the Hooker 100-inch telescope — Calisphere
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Structural drawing of the upper end of the 150-foot tower telescope and dome, Mount Wilson Observatory. - Photographs - Huntington Digital Library
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