Concrete mixer and several unidentified construction workers, building a water reservoir on Mount Wilson. One construction worker is seen standing on top of the concrete mixer itself. A wheelbarrow sits on the ground to the right of the mixer; an observatory tower can be seen in the background. Trees are also in the background, behind the construction area. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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