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Image: Armstrong FM radio station W2XMN Alpine NJ 1940
Size of this preview: 408 × 600 pixels. Other resolutions: 163 × 240 pixels | 654 × 961 pixels.
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Description: First broadcast FM radio station W2XMN built by Edwin Armstrong in 1938 in Alpine, New Jersey, USA. The insets show a portion of the transmitter, and a map of Armstrong's network of FM stations in 1940.
Title: Armstrong FM radio station W2XMN Alpine NJ 1940
Credit: Retrieved October 3, 2015 from E. W. Murtfeldt, "What are the facts about FM?" in Popular Science magazine, Popular Science Publishing Co., New York, Vol. 137, No. 5, November 1940, p. 73 on Google Books
Author: E. W. Murtfeldt
Permission: 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.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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