Word: microbarograph
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Dates: during 1960-1969
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When the Soviet 50-megaton test-bomb exploded on Novaya Zemlya last October, it set the earth's whole atmosphere vibrating. Last week in London, Seismologists Eric Carpenter, George Harwood and Thomas Whiteside reported how the bomb waves looked when they were recorded on the microbarograph at Britain's Atomic Weapons Research Establishment...
...Microbarographs (sensitive recording barometers) got the word slightly later. An explosion in the lower atmosphere puts almost half of its energy into shock waves that travel through the air, turning first into audible sound waves with a thunderlike bang, then into fluctuations of pressure. Microbarographs can detect this pressure wave more than 1,000 miles away. The U.S. has a ring of microbarographs waiting for interesting waves to wash down from the Soviet border. A clear reading from a microbarograph gives a good estimate of an explosion's punch...
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