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One of two photographs on separate mounts of the U.S. Naval Observatory, Washington in 1915 at its new site.

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, Washington in 1915 at its new site.

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

Photograph of Yerkes Observatory at Williams Bay, Wisconsin taken in 1915.

Photograph of Yerkes Observatory at Williams Bay

1915
One of four photographs mounted in glazed museum frame showing two views of the filar micrometer for the 40-inch Yerkes refracting telescope, at Williams Bay; Wisconsin; USA.

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

1915
One of four photographs mounted in glazed museum frame showing a sectioned drawing of the 90-foot Dome and 75-foot elevating floor for the 40-inch Yerkes refracting telescope, at Williams Bay; Wisconsin; USA.

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

1915
Photograph (2' 5" x 2' 11") of the 40" Yerkes telescope

Photograph of the 40" Yerkes telescope

1915
Photograph (2' 5" x 2' 11") of the 36" Lick telescope

Photograph of the 36" Lick telescope

1915
Selection of four photographs mounted in glazed museum frame showing various details of the 40-inch Yerkes refracting telescope, at Williams Bay; Wisconsin; USA.

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

1915
Two photographs mounted in a passe-partout frame showing the Lick Observatory at Mount Hamilton, California during Summer and Winter.

Summer and winter views of Lick Observatory, 1915

1915
Two photos on one mount of the U.S. Naval Observatory at Washington

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

1915
One of four photographs mounted in glazed museum frame showing the equatorial mounting for the 40-inch Yerkes refracting telescope, at Williams Bay; Wisconsin; USA.

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

1915
One of four photographs mounted in glazed museum frame showing tailpiece and controls for the 40-inch Yerkes refracting telescope, at Williams Bay; Wisconsin; USA.

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

1915
One of two photographs mounted in a passe-partout frame showing the Lick Observatory at Mount Hamilton, California during Summer.

Summer view of Lick Observatory, 1915

1915
One of two photographs mounted in a passe-partout frame showing the Lick Observatory at Mount Hamilton, California during winter.

Winter views of Lick Observatory, 1915

1915