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File:U of Pennsylvania accelerator beam tube 1940.jpg

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Summary

Description
English: Inside the beamtube of a electrostatic particle accelerator at the University of Pennsylvania in 1940. During operation, subatomic particles travel through the evacuated pipe at center, accelerated by a million volt electrostatic potential. The metal rings along the tube are called grading rings and serve to even out the potential along the tube, to prevent arcing.
Date
Source Retrieved April 12, 2015 from "Giant atom gun gets final check-up" in Popular Science" magazine, Popular Science Publishing Co., New York, Vol. 137, No. 6, December 1940, p. 103 on Google Books
Author Unknown authorUnknown author
Permission
(Reusing this file)
This 1940 issue of Popular Science magazine would have the copyright renewed in 1968. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. Search of the Renewals for Periodicals for 1967, 1968, and 1969 show no renewal entries for Popular Science. Therefore the copyright was not renewed and it is in the public domain.

Licensing

Public domain
This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs.

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December 1940

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current14:13, 30 April 2015Thumbnail for version as of 14:13, 30 April 2015682 × 874 (143 KB)ChetvornoUser created page with UploadWizard

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