Word: seismograph
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Seismologists had been quite bewildered over the inexplicable jittering of the seismograph located until recently in the University Museum. Adopting a procedure long in vogue in scientific circles, one of the more imaginative of the bewildered postulated at random a cause for the instrument's super-oscillations, and then proceeded to prove his guess...
Next day his theory was completely verified. Because of the loose suspension of the horizontal beams of the building, the seismograph record of the night before indicated cataclysmic upheavals at every step he had taken. Apparently the instrument had been particularly disturbed in the course of his descent from the top floor...
Minor earthquakes made by students coming to classes caused the removal of the Seismograph Station from the University Museum says Dr. L. Don Leet, instructor in Geology and director of the present station...
...years ago. With no knowledge of how deep this layer was, it was thought that it thinned out eastward, exposing at or near the edge of the Shelf the basic granite foundation of the North American continent, some 1,000,000,000 years old. Dr. Ewing's twitchy seismograph needles now told him how thick the sedimentary layer was. Near the shore the thickness was 500 ft. But as he moved eastward, the layer, instead of dwindling as he expected, got thicker & thicker. At the brink of the Shelf the sedimentation was two miles deep. Thus it appeared that...
...contour to oceanographers. Dr. Field wanted to know what lay beneath that bottom. I occurred to him to use the "artificial" earthquake method by which oil prospectors map subterranean rock structures. This involves setting off charges of dynamite, measuring the time required for the earth ripples to reach a seismograph planted some distance away, studying the wavy lines on the seismograph record (TIME. Nov. 4). This set-up is called a geophone. Transplanting it to the sea floor and making it work there was like doing a chemical experiment at the bottom of a swimming pool. Nevertheless the geologist...