Word: seismograph
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Dates: during 1950-1959
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Builders from All Over. Seeing hope in these improvements, settlers are coming in, turning wasteland into farms and farms into communities. The town of Gurupi, nonexistent 18 months ago, has jus finished harvesting a 2½ million-lb. rice crop. Directed by U.S. geologists, seismograph crews are hacking their way through the brush to set off exploration blasts and measure the echoes for the government oil monopoly, Petrobras; drilling crews are battling their way through vines and tangled trees to bore into promising substratum. Results so far: traces...
...Like a seismograph recording an earthquake in trackless ocean depths, Radio Peking last week revealed a major upheaval in the government of Red China. In the greatest purge in four years, some 25 vice ministers and other senior officials were fired from their jobs. The causes of the shakeup, though not divulged by Peking, seemed clear: the humiliating failure of "the great leap forward," the enforced revision of phony production statistics (TIME, Sept. 7), popular antipathy to the vaunted rural communes, and growing strain between Red China's Communist Party and army...
...Mile Crack. In pursuit of this theory the Lamont men, soon helped by other oceanographers, followed the crack in the sinuous ridge. Sometimes they spotted it on new depth charts, sometimes on old ones. When they noticed that many shallow earthquakes came from under it, they searched seismograph records for similar earthquake centers in unsounded parts of the oceans. By last week the Lamont men could trace the cracks 40,000 miles clear around the earth (see map). As in the Atlantic, the cracks generally follow the tops of rises in the ocean bottom. They stay midway between large land...
...system is based on a type of seismograph in which a heavy weight is suspended so that it holds still while the earth waves move past it. The slight motion between the weight and electrical elements close to it creates a fluctuating electrical current. Before the current reaches the recording apparatus Pomeroy and Sutton pass it through a special galvanometer-a coil that makes a small weight move against the resistance of a delicate spring. The waves in which they are interested are long and of low frequency (40 to 50 sec.). They found that by choosing a galvanometer with...
Jumbles Made Sharp. The result was magical. Seismograph records that were hardly more than meaningless jumbles turned into clear, sharp records of distant earthquakes. When Dr. Sutton showed these records to a recent Washington meeting of seismologists, the contrast was so striking that the sophisticated audience burst into applause...