Early_radar_antenna_-_US_Naval_Research_Laboratory_Anacostia.jpg
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Summary
Description Early radar antenna - US Naval Research Laboratory Anacostia.jpg |
English:
Antenna
of one of the first experimental US
radars
being developed during the late 1930s on the roof of the US Naval Research Laboratory, Anacostia, Washington DC. Operating at 200 MHz, it was the first rotating radar antenna. Research in radiolocation was started as early as 1922 by Naval radio engineers Albert Hoyt Taylor and Leo Clifford Young. In 1930 at the newly opened NRL, with another engineer Lawrence Hyland they began a research program. In 1934 they patented a radar system. This picture shows a "bedspring" antenna made of multiple
dipole antennas
which was needed to create a beam narrow enough to locate ships or planes. The antenna is mounted on a mast so it can rotate and also tilt to point up into the sky. The rotating mast extends through the roof to a large manual wheel in the room below which contains the radar equipment, so it can be rotated by hand.
Caption: Closeup of the antenna of the first complete radar, installed "topside" of a building at the Naval Research Laboratory, Anacostia, D. C. in the late 1930s. It is a "dirigible" antenna, meaning that it is so mounted that it can be turned to allow for around the compass search |
Date | |
Source | Retrieved September 30, 2014 from "Radar: The Silent Weapon of World War 2" in Radio News magazine, Ziff-Davis Publishing Co., New York, Vol. 34, No. 4, October 1945, p. 30 on American Radio History site |
Author | Unknown author Unknown author |
Permission
( Reusing this file ) |
This 1945 issue of Radio News magazine would have the copyright renewed in 1973. 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 1978 and later show no renewal entries for Radio News . Therefore the magazine's copyright was not renewed and it is in the public domain. |
Licensing
Public domain Public domain false false |
This work is in the
public domain
because it was published in the United States between 1929 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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