Radar, one of the most heavily curtained of war secrets, was bared for a quick peek by the Army and Navy. The word stands for "radio detecting and ranging." Basis of operation, a high-frequency radio ray, scanning air or sea, bounces back from objects it strikes: e.g., ships or planes. Radar measures the infinitesimal fraction of a second this takes (at 186,000 miles an hour), thus calculates distance as well as direction. Both Britain and Germany have similar devices.
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