First betatron 1940

Autor:

NieznanyUnknown author

Credit:

Retrieved January 2, 2015 from Electronics magazine, McGraw-Hill Publishing Co., New York, Vol. 15, No. 2, February 1942, p. 22 on http://www.americanradiohistory.com

Krótki link:

https://plwiki.pl/b/c1858

źródło:

Wikimedia Commons

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701 x 832 Pixel (176426 Bytes)

Opis:

The first betatron, a particle accelerator that accelerates electrons, built at University of Illinois in 1940 by Donald W. Kerst, seen at right working on the pole pieces. It consisted of a 4 ton electromagnet with a donut-shaped vacuum chamber circling the pole piece and produced 24 Mev electrons.

Licencja:

Public domain

Komentarz do licencji:

This 1942 issue of Electronics magazine would have the copyright renewed in 1970. 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 1969, 1970, and 1971 show no renewal entries for Electronics. Therefore the magazine's copyright was not renewed and it is in the public domain.