German Army 21cm Morser 18 Heavy Artillery

The 21 cm Mörser 18 (21 cm Mrs 18), or 21 cm Mörser M 18/L31, was a German heavy howitzer used in the Second World War by Independent artillery battalions and batteries. A number were also used by coastal artillery units. Design A Mrs…

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Read more about the article Aircraft detection before radar, 1917-1940
Aircraft engines produced unprecedented sound, so in order to hear them at a distance, the war efforts developed listening devices. A two-horn system at Bolling Field, USA, 1921.

Aircraft detection before radar, 1917-1940

Acoustic location was used from mid-WW1 to the early years of WW2 for the passive detection of aircraft by picking up the noise of the engines. Passive acoustic location involves…

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