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Home Snow telescope and the 60-inch tower telescope(?) at Mount Wilson Observatory, ca.1930

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Snow telescope and the 60-inch tower telescope(?) at Mount Wilson Observatory, ca.1930

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Title	Snow telescope and the 60-inch tower telescope(?) at Mount Wilson Observatory, ca.1930
Description	Photograph of the snow telescope and the 60-inch tower telescope(?) at Mount Wilson Observatory, ca.1930. The snow telescope is the long horizontal building behind the tower telescope. Wires provide additional support for the tower telescope. Trees surround the facilities.; "The Snow Telescope, the oldest telescope on the mountain, is named after its benefactor, Helen Snow. She donated money for its construction at Yerkes Observatory in Williams Bay, Wisconsin. George Ellery Hale moved the telescope to Mount Wilson in 1904 to make observations of the Sun. Dr. Hale took the telescope on loan from Yerkes, although it has been here ever since. Unlike the two tower solar telescopes (which were built later), the light path for the Snow Telescope is horizontal. The building is long and originally was covered in canvas. This was a great fire hazard, and the crude building was replaced with an aluminum shell in 1911. Light from the Sun is reflected off the coelostat mirror (on the right partially in shadow) to another 30-inch mirror (at center) and reflected nearly horizontally 100 feet to the back of the building. There, it falls on a 24-inch concave mirror with a 60-foot focal length and is then brought to a focus at the entrance slit of the spectrograph as an image 6 1/2 inches across. The spectrograph is located in a 15-foot pit. Despite its simple construction, the horizontal light path of the Snow Telescope made observations difficult because heat from the sunlit ground affected the observational seeing. Therefore, shortly after being put into operation in 1904, plans were made to build the 60-foot Solar Tower." -- unknown author.
Subject	Mount Wilson Observatory
Subject (adlf)	research facilities
Subject (file heading)	Observatories -- Mount Wilson Observatory
Subject (lcsh)	Observatories Telescopes Astronomical instruments
Geographic subject (county)	Los Angeles
Geographic subject (state)	California
Geographic subject (country)	USA
Coverage date	circa 1930
Photographer	Pierce, C.C. (Charles C.), 1861-1946
Publisher (of the digital version)	University of Southern California. Libraries
Date created	circa 1930
Type	images
Format	glass plate negatives
Format (aacr2)	2 photographs : glass photonegative, photoprint, b&w ; 21 x 26 cm.
Format (aat)	photographic prints photographs
Accession number	5672
Call number	CHS-5672
Microfiche number	1-100-12
Legacy record ID	chs-m10581; USC-1-1-1-10730
Part of collection	California Historical Society Collection, 1860-1960
Part of subcollection	Title Insurance and Trust, and C.C. Pierce Photography Collection, 1860-1960
Project	USC
Rights	California Historical Society
Access conditions	Send requests to address or e-mail given. Phone (213) 821-2366; fax (213) 740-2343.
Repository name	USC Libraries Special Collections
Repository address	Doheny Memorial Library, Los Angeles, CA 90089-0189
Repository email	specol@usc.edu
Filename	CHS-5672
Archival file	chs_Volume91/CHS-5672.tiff

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Home Snow telescope and the 60-inch tower telescope(?) at Mount Wilson Observatory, ca.1930

Snow telescope and the 60-inch tower telescope(?) at Mount Wilson Observatory, ca.1930

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