3217

Acoustic locators during the First World War





During World War I invented acoustic locators to detect aircraft.
After some time, locators have become ineffective because there radars.

Acoustic locators during the First World War



Acoustic locators during the First World War

Acoustic locators during the First World War

Acoustic locators during the First World War

Acoustic locators during the First World War

Acoustic locators during the First World War

Acoustic locators during the First World War

Acoustic locators during the First World War

Acoustic locators during the First World War

Acoustic locators during the First World War

Acoustic locators during the First World War

Acoustic locators during the First World War

Acoustic locators during the First World War

Acoustic locators during the First World War

Acoustic locators during the First World War

Acoustic locators during the First World War

Acoustic locators during the First World War

Acoustic locators during the First World War

Acoustic locators during the First World War

Acoustic locators during the First World War

Acoustic locators during the First World War

Joke
 Why Climate Change Conference ended in a stalemate?  Meeting lovers summer tires