Word: groundward
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Dates: during 1930-1939
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What did these tricks was a "terrain clearance indicator,"'first practical development of a radio-run absolute altimeter. From a transmitting antenna on one wing, radio waves are bounced groundward, caught on the rebound by a receiving antenna on the other wing. The elapsed time interval is measured in millionths of a second at radio's speed of 186,300 miles per second, is translated into feet on the altimeter...
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