Word: sonar
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...supersophisticated sonar that bounces pings off thermal layers in the water, can reach out 35 miles, nearly three times as far as existing sonars; it is standard equipment on all ASW surface ships under construction...
Harnwell helped invent sonar while a professor of physics at Pennsylvania...
...enjoy his Army service in Korea. He also does not enjoy the company of his father, memories of school, sex, lack of sex, working in a bank, or much else. Other characters, some of whom might have been interesting, are perceived only by a kind of melancholic sonar: Wilkinson sends out waves of gloom that bounce off the other people in the book and return to him as angst amplified...
...with Dr. Dunning's help, Roeder has discovered much more advanced moths that send out their own sonic signals; they can make clicking sounds that are not very different from the search-sonar pulses of bats...
...hundredth of a knot? What about an unsinkable, watertight canvas bag, roomy enough to stow cameras, film, wallets, watches and jewelry? He certainly needs the new $200 German binoculars that weigh less than a pound, float, and-reflect flashlight rays in the dark. Not to mention the latest sonar-system depth finder, which costs a mere $299.95 and reads up - or down - to 100 fathoms...