Warner & Swasey Co.

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 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

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

Photograph of the 40" Yerkes telescope

Photograph of the 36" Lick telescope

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

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

Summer view of Lick Observatory, 1915

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