Six-Inch Rifled Gun No. 9

Baker Beach, San Francisco, California. County/parish: San Francisco.

Added to the National Register of Historic Places February 07, 1979. NRIS 79000255.

2 contributing structures. 1 contributing object.

Also known as:

Six-Inch Disappearing Rifle

From Wikipedia:

Battery Chamberlin is an artillery battery in the Presidio of San Francisco, San Francisco, California, United States. The battery is named in honor of Captain Lowell A. Chamberlin, who had served with distinction in the Civil War. It was added to the National Register of Historic Places on November 7, 1976.

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National Park Service documentation: https://catalog.archives.gov/id/123861307