Image: Grindell-Matthews death ray

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Description: Picture of a purported "death ray" invented by British engineer Harry Grindell Matthews
Title: Grindell-Matthews death ray
Credit: Retrieved March 7, 2014 from Popular Radio magazine, Popular Radio, Inc., New York, Vol. 7, No. 1, January 1925, frontispiece, p. 2 on American Radio History website
Author: Credited to Underwood and Underwood
Permission: This 1925 issue of Popular Radio magazine would have the copyright renewed in 1953. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. [1] Search of the Renewals for Periodicals for 1952, 1953 and 1954 show no renewal entries for Radio World. Therefore the magazine's copyright was not renewed and it is in the public domain.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

Image usage

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