Three unidentified men lowering the lifting device onto the 100-inch mirror prior to returning it to the telescope, Mount Wilson Observatory. Two of the three men, wearing work clothes and hats, are seen at the far left, with their hands on a portion of the lifting device. The third unidentified man stands opposite, at the far right. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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