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Using Giant Arrows to Guide Airmail Flights - Geography Realm Source: National Archives, 6857715, public domain The emergence of radio navigation and radar in the 1930s eventually removed the need for night time lighted airways for navigation The beacons were decommissioned by the Department of Commerce starting in the 1940s
Free to Use and Reuse Sets - Library of Congress The Library believes that this content is either in the public domain, has no known copyright, or has been cleared by the copyright owner for public use Each set of content is based on a theme and is first featured on the Library's home page
The Evolution of Airway Lights and Electronic Navigation Aids In 1919, U S Army Air Service Lieutenant Donald L Bruner began using bonfires and the first artificial beacons to help with night navigation In February 1921, an airmail pilot named Jack Knight put this to the test with his all-night flight to Chicago from North Platte, Nebraska
A Brief History of Air Traffic Data Communications – Air Traffic . . . The early Air Mail Radio Stations (AMRS) of the 1920s used radio telegraphy to communicate with each other The information was written by the radio operator as they translated the dots and dashes back into English
Concrete arrows in American desert – airmail beacons - Fact Source Funded in 1923 by U S Congress, they connected the Atlantic and Pacific coasts in 1924, and in 1933 the system reached a total 1500 beacons, and 18,000 miles of routes This helped to decrease mail delivery time from coast to coast to only 3 days
Air Mail Mystery : Old Time Radio Researchers Group : Free Download . . . OTRR Maintained Set -- This set contains all known episodes in the best available audio condition with the most accurate dates and titles known to be in general circulation and based on current research at the time of release Replaces OTRR Certified Accurate and OTRR Certified Complete
Radio | National Postal Museum The need for Air Mail Service pilots to be in contact with landing fields was considered important, but after trials through 1922, radio tests were set aside for lack of funding until 1925
Are amateur radio transmissions in the public domain? But even if you have a license, transmitting does not put the materials into the public domain: it is a fixed expression (replayed on amateur band) and thus copyrighted