Tom Nelson standing beside a car in front of the 100-inch telescope dome, Mount Wilson Observatory. Nelson began as a driver for the Observatory in 1915, and became the chief night assistant in the Observatory until his retirement in 1949. A flatbed trailer is attached to the back of the car; the corrugated sheet metal exterior walls of the observatory building are seen behind Nelson and the car. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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