Installation of the ring onto the 100-inch telescope mirror, Mount Wilson Observatory. An unidentified man in a suit stands next to the mirror at the far right of the photograph. The ring is suspended from ropes attached to an unseen crane. The interior balcony and walls of the observatory building are seen in the background. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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