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चित्र:Armstrong FM radio station W2XMN Alpine NJ 1940.jpg

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सारांश

बिबरणArmstrong 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.
तारीख
स्रोत 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
लेखक E. W. Murtfeldt
परमीशन
(एह फाइल के दुबारा इस्तेमाल)		 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.

लाइसेंसिंग

Public domainPublic domainfalsefalse
Public domain
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.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.

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Camera location४०° ५७′ ३१.८″ N, ७३° ५५′ २३.४″ W  Heading=0° Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo 40.958833; -73.923167

Captions

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Edwin Armstrong's experimental FM station in 1938

Items portrayed in this file

depicts अंगरेजी

copyright status अंगरेजी

public domain अंगरेजी

determination method or standard अंगरेजी: copyright not renewed अंगरेजी

inception अंगरेजी

नवंबर 1940

coordinates of the point of view अंगरेजी

40°57'31.799"N, 73°55'23.401"W

heading अंगरेजी: ० डिग्री

media type अंगरेजी

image/jpeg

checksum अंगरेजी

3343c938ff8ff8df2a2a7916cb440ba0ebd4a289

determination method or standard अंगरेजी: SHA-1

data size अंगरेजी

२२०,४४९ byte

height अंगरेजी

९६१ पिक्सेल

width अंगरेजी

६५४ पिक्सेल

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