Word: echoing
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Dates: during 1940-1949
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...Beam That Sees. An electronic supergadget which "sees" as well in the dark as in the light, radar projects a radio beam which, on striking an object near or far, returns an echo that is translated into a visual image on the radar screen. Radar can see the flight of a shell, the wake of a ship, the explosion of a target, the fall of a hit plane. At sea, it can detect buoys, reefs and other ships more than 20 miles away...
...with the best claim to discovery of radar's principle was the 19th Century German physicist Heinrich Hertz, who in 1887 bounced a hertzian (radio) wave off a zinc plate and caught its echo on a resonant circle of copper wire...
...simplest terms, a radar set shoots radio energy at a target, catches the reflected echo, times the round trip, divides by two, and. since the speed of the radio wave is known, translates all the information into a "blip" of light on a fluorescent (television) screen showing the target's distance and position...
Cried Laski: "We've placed the people in power. . . . It's part of a world revolution ... the Fourth Estate, the common people, have opened the barriers which shut them out. . . . This is a day indeed to echo the famous sentence: 'We have nothing to lose but our chains and a world...
...hours the guns roared, and their shellbursts walked through the steel plant. The Jap reply from shore batteries was only a whispered echo. The "sacred soil" of Japan, from which the Kamikaze (divine wind) was supposed to disperse all attackers, had been violated...