Warner & Swasey Co.

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

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

Summer view of Lick Observatory, 1915

Winter views of Lick Observatory, 1915

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

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

Photograph of the 40" Yerkes telescope

Photograph of the 36" Lick telescope

4 photographs of 40-inch Yerkes refracting telescope, at Williams Bay

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