Word: sounding
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Dates: during 1940-1949
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...blue-and-white sound truck, trailing behind it the jumble of static and jazz music, rolled along the narrow roads of western Pennsylvania last week into the town the maps call Brush Valley, and the 500 residents call Mechanicsburg. As it stopped before the general store, a dozen children gawked at its placarded sides: "Mrs. Robert L. Coffey Sr. for Congress. Brave Mother of a Brave...
...Texas Cancer Bulletin was started early in 1948 by Dr. Randolph Lee Clark Jr., director of Texas University's M.D. Anderson Hospital for Cancer Research, in Houston. He had a sound idea: most cancer patients are seen first by general practitioners who cannot cull all the journals for specialized articles; therefore they should be taught, through short, snappy, easy-to-read articles, how to spot the disease quickly...
Every veteran of submarine war patrols has stories of false "enemy contacts" reported by underwater detecting devices. If the signals were only reflections of the high-frequency sound waves sent out by the sub itself, false alarms could easily be caused by whales or schools of fish. But far more baffling were the cases in which a different sound impulse was recorded. This, it seemed, might be the enemy's own detection device at work. Many a crew was called to battle stations ready for deep-sea combat, only to learn that the signals had been lost...
...possible conclusion: whales and their kin were the real inventors of sonar.* What they used it for, men can only guess. Mrs. Fish found apparent confirmation of the theory in the pig-boats' logs: when a sub jammed the "enemy's signal by sending out its own sound waves, the transmission stopped. Evidently the whales were confused...
...method of undersea detection, highly developed in World War II, employing easily focused high-frequency sound waves near the upper edge of the audible range. A large object in the water sends back an echo; its distance from the submarine is computed by timing the echo...