Eight years later, the same engineers discovered their radio technology, later called radar, could detect enemy planes from miles away. They submitted a proposal to develop the idea. When a ship sailing down the Potomac disrupted their signal, they quickly realized their system could be used to detect enemy ships through fog or darkness. They were testing new ways for ships to communicate at sea. set up a radio transmitter and receiver on opposite sides of the Potomac. Navy’s research lab just outside Washington, D.C.
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