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(Left to right): Roscoe Sanford (in electric suit) and Tom Nelson at the coude focus of the 100-inch telescope, Mount Wilson Observatory. Sanford stands to the right and just behind the seated Nelson. Sanford is wearing an electric suit, and Nelson is wearing a heavy coat and hat. Numerous instruments are seen in the surrounding area. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.