The 'war tubas' we used to spot warplanes before radar - CNN Style
Chain Home - Wikipedia
Before the invention of radar, the "sound finder" in the First World War relied on listening to find airplanes! : r/interestingasfuck
Aircraft detection before radar
Acoustic mirror - Wikipedia
Aircraft detection before radar, 1917-1940 - Rare Historical Photos
World War I in Photos: Technology - The Atlantic
Before Radar, they used these giant concrete "Sound Mirrors" to detect incoming enemy aircraft
Aircraft detection before radar, 1917-1940 - Rare Historical Photos
Listening device war hi-res stock photography and images - Alamy
CameraLab on Twitter: "Long before the invention of radar, german officers wearing portable sound locating apparatus to detect enemy aircraft on Western Front of WWI, 1917 https://t.co/pVcGlrt64b" / Twitter
Aircraft detection before radar, 1917-1940 - Rare Historical Photos
History of radar - Wikipedia
Sound Mirrors: Before Radar, Hearing Was Believing | Urbanist
Aircraft detection before radar, 1917-1940 - Rare Historical Photos
RCM vs Wurzburg
Aircraft detection before radar, 1917-1940 - Rare Historical Photos
Radar and Sonar
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
Acoustic Radar.
Radar during World War II - Engineering and Technology History Wiki
Suspension of Disbelief: Before Radar, there was Sonar.
Radar world war ii hi-res stock photography and images - Alamy
How was sound used before radar to warn of enemy aircraft approaching Britain? - Quora
The 'war tubas' we used to spot warplanes before radar - CNN Style
