Like many of the most important creations of history, the radar was an invention developed in a war context to provide some military advantage. Specifically, it was in the Second World War when one of its main founders, physical Robert Watson-Watt , allowed the Royal Air Force of the British Armed Forces had technological superiority to be able to measure and detect the distances using radio.
However, the enemy planes were a threat even when yet radar existed. On that occasion, were born a few gadgets whose purpose was to detect any possible hostile air force used as a way to attack.
aerial locators Japanese army in 1930
The “Ringtrichterrichtungshoerer” used by the Germans.
So, the main picture is taken at the American air base at Bolling Field in 1921. It is a system based on acoustic mirrors designed to listen engines aircraft located a long distance.
Just as a mirror is capable of bouncing light rays, acoustic mirrors can collect sound waves and concentrate on its core focus so amplify the sounds received . Before the advent of radar, experimented with multiple models and designs of these acoustic mirrors, a technology that today even we can look up comic
Credit . National Photo Co. .
October 15, 2015
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