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In due time they reach, say the Isle of Wight, where they set the pencil of the seismometer at work. But there are different ways round the earth from Japan to the Isle of Wight, the most direct route being across Asia and Europe; the other route across the Pacific, America, and the Atlantic. The vibrations will travel by both routes, and the former is the shorter of the two."
First is the seismoscope, which will merely detect and record the fact that there has been such a tremor. Some of these are so equipped as to indicate the time of the disturbance. Second, is the seismometer, the function of which is to measure the maximum force of the shock, either with or without an indication of its direction.
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