Yerkes Observatory under construction, looking northeast. The brick work for the first and second floors is complete, and the first of the steel girders are in place for the great dome. A construction worker is visible on the base of the great dome. The base for the great dome is on the left, and the base of the south dome is on the right. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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