ꯐꯥꯏꯜ:Armstrong FM radio station W2XMN Alpine NJ 1940.jpg
Error creating thumbnail: File missing
Other resolution: ৬৫৪ × ৯৬১ pixels.
Original file (৬৫৪ × ৯৬১ pixels, file size: ২১৫ KB, MIME type: image/jpeg)
Summary
| DescriptionArmstrong FM radio station W2XMN Alpine NJ 1940.jpg |
English: 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. |
| Date | |
| Source | 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 (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 domainPublic domainfalsefalse |
|
This work is in the public domain because it was published in the United States between 1931 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.
|
 |
| Camera location |   | View this and other nearby images on: OpenStreetMap |  40.958833; -73.923167 |
|---|
Captions
Add a one-line explanation of what this file represents
Edwin Armstrong's experimental FM station in 1938
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 23:32, 3 October 2015 | Error creating thumbnail: File missing | ৬৫৪ × ৯৬১ (২১৫ KB) | smartcommons>Chetvorno | User created page with UploadWizard |
File usage
There are no pages that use this file.
