Acoustic Radar. Horn and Wooden Wine Rack Construction.
How was sound used before radar to warn of enemy aircraft approaching Britain? - Quora
Acoustic mirror - Wikipedia
Ron Piovesan on Twitter: "@PikeGrey1418 @wherrypilgrim Excellent history of these devices and how WW1 accelerated innovation in military listening technology is found in Stereophonica by @gasciaouzounian - https://t.co/i0gI2rbSxv" / Twitter
Before the invention of radar technology in World War II, enemy aircraft were spotted using sound locators that looked like musical instruments. 1927. Source: Gallica BnF : r/MilitaryHistory
Radar in operation in the second World War / Signal Corps photo. | Library of Congress
Chain Home - Wikipedia
Aircraft Detection Before Radar | Radar, Forest sounds, Creative writing ideas
Aircraft detection before radar, 1917-1940 - Rare Historical Photos
Aircraft detection before radar, 1917-1940 - Rare Historical Photos
Before Radar, These Giant Concrete “Sound Mirrors” Were Used To Detect Incoming Enemy Aircraft | History Daily
World War I in Photos: Technology - The Atlantic
Aircraft detection before radar, 1917-1940 - Rare Historical Photos
Aircraft detection before radar, 1917-1940 - Rare Historical Photos
Aircraft detection before radar, 1917-1940 - Rare Historical Photos
Aircraft Detection Before Radar - Aviation Humor
Anti-Aircraft Sound Locator from World War I (Pre Radar) British/Canadian - YouTube
Heroes of World War II, 1, The Men Who Invented Radar | Alexander Street, part of Clarivate
The 'war tubas' we used to spot warplanes before radar - CNN Style
Radar and Sonar
Before Radar, they used these giant concrete "Sound Mirrors" to detect incoming enemy aircraft
Wireless Direction Finding - Early SIGINT - Making It Up
Acoustic Radar. Horn and Wooden Wine Rack Construction.
RADAR - The Battle Winner? | History of the Battle of Britain | Exhibitions & Displays | Research | RAF Museum
Aircraft detection before radar, 1917-1940 - Rare Historical Photos
