From World War II Radar to Microwave Popcorn, the Cavity Magnetron Was There

This compact cavity magnetron gave the Allies a way of producing high-power microwaves for radar Photo: Ingenium

By the summer of 1940, World War II had been raging in Western Europe for nearly a year. During the Battle of Britain, German aircraft bombed London and industrial centers and blockaded seaports. The United States, meanwhile, was still actively trying to stay out of the war.

Against this backdrop, the physicist EdwardTaffy” Bowen traveled with a group of other...

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