1935: The feasibility of radar is demonstrated for the British Air Ministry. It would prove to be a just-in-the-nick-of-time invention that helped save Great Britain from defeat in World War II.
Radar (for RAdio Detection And Ranging) was developed by Robert Watson-Watt, a Scottish physicist looking for a reliable method to help airmen locate and avoid approaching thunderstorms. Watson-Watt realized, as he perfected his device, that radio waves could be used to detect more than storms.
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