A collection of photographs and audiovisual materials chiefly related to Mount Wilson Observatory, Los Angeles County, California, and 20th-century astronomical research.

Mount Wilson Observatory was founded in 1904 by George Ellery Hale under the auspices of the Carnegie Institution of Washington. Built on the summit of Mount Wilson, above Pasadena in Los Angeles County, California, it was called the Mount Wilson Solar Observatory until 1919, when "Solar" was dropped from the name.

35.55 Linear Feet (87 boxes, 5 volumes)

The Huntington Library does not require that researchers request permission to quote from or publish images of this material, nor does it charge fees for such activities. The Huntington Library owns the copyright for these materials; copyright was transferred by the Observatories of the Carnegie Institution of Washington.

Open for use by qualified researchers and by appointment. Please contact Reader Services at the Huntington Library for more information.