Word: barograph
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Dates: during 1960-1969
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...bomb exploded at 8:33 a.m. British time. By 11:44 a.m., the first air wave reached England, having taken 3 hr. 11 min. to travel from Novaya Zemlya at the speed of sound-about 700 m.p.h. At 4:40 p.m. on the next day, the barograph pen jiggled again, recording the air waves that had taken the long path and circled the earth in the opposite direction and approached England from the southwest. At ten minutes past midnight on Nov. 1, the first wave swept over England again, making almost as strong a record as on its first trip...
...explosion of the Indonesian volcano Krakatoa sent out air waves that registered easily on the crude barographs of the period. Big as the Soviet bomb was, its waves were far weaker than the volcano's, but the time they took to circle the earth was almost exactly the same: 36 hr. 27 min. Small variations in their speed were due to varying winds and temperatures. Carpenter is now putting the Soviet bomb test to unexpected and peaceful use: he is asking the world's scientists to send him copies of their barograph records so that he can study...