Winter views of Lick Observatory, 1915

Summer view of Lick Observatory, 1915

One of four photographs showing tailpiece and controls for the 40-inch Yerkes refracting telescope

One of four photographs showing the equatorial mounting for the 40-inch Yerkes refracting telescope

Summer and winter views of Lick Observatory, 1915

Two photos on one mount of the U.S. Naval Observatory at Washington

Photograph of Yerkes Observatory at Williams Bay

One of two photographs on separate mounts of the U.S. Naval Observatory

One of two photographs on separate mounts of the U.S. Naval Observatory

Photograph, sectioned drawing of the 90-foot Dome and 75-foot elevating floor for the 40-inch Yerkes refracting telescope

One of four photographs showing two views of the filar micrometer for the 40-inch Yerkes refracting telescope

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