Technical drawing showing the driving clock of the Hooker reflecting telescope, worm wheel, south spherical bearing, mercury trough and steel float, also quick motion drive in right ascension, Mount Wilson Observatory. The legend in the lower right-hand corner reads: "100 in. reflecting telescope, sectional assembly, south end of telescope, Mount Wilson Solar Observatory, Pasadena, California". Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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