Construction of the foundation floor for large water reservoir, Mount Wilson. Four unidentified men are working within the reservoir site, one is wheeling a wheelbarrow, and another is smoothing freshly poured concrete with a tool. The wire mesh lining the foundation floor can be seen. two unidentified children sit at the edge of the reservoir's perimeter. A bucket is in the foreground, in the area where concrete has not yet been poured. Trees 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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