Explainer: Locating a gun with sound waves
In WWI, scientists used sound waves to find big guns
![german gun](https://www.snexplores.org/wp-content/uploads/2019/11/860-header-explainer-1-destroyed-german-gun-in-China-1919.jpg)
Scientists used microphones to locate and destroy killing machines like this, the remains of a German gun.
Great War Primary Document Archive: Photos of the Great War - www.gwpda.org/photos