How was the detection of enemy aircraft before the invention of radar? Detailed answer

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How was the detection of enemy aircraft before the invention of radar? Detailed answer

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How was the detection of enemy aircraft before the invention of radar?

Before the invention of radar, special "hearers" were engaged in detecting approaching enemy aircraft. Their equipment varied in different armies, but the principle was the same: large microphones, whose position in space could be adjusted, transmitted sound to the ears of the operator. In other words, the determination of the position of air objects was carried out with the help of huge stethoscopes.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

What object meant to be destroyed turned into 100 indestructible?

In 1923, the American artist Man Ray created the work "Object Destined for Destruction". It was an ordinary metronome, on the pendulum of which was attached a piece of a photograph of a woman's eye. In 1957, a group of Parisian students broke into the building where this object was exhibited, seized it, and already on the street one of the thieves shot him with a pistol. Man Ray received insurance for this destruction and created 100 replicas, each of which was named "Indestructible Object". They can be seen in various museums and private collections.

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