In designing a seismograph to measure strong motion it is important not to confine attention merely to the maximum acceleration or displacement of the earth motion; these are not sufficient to determine how much a building will be damaged. The fundamental problem is to measure the amount of motion associated with the periods to which the buildings respond. These periods are in the range from three-tenths of a second to three seconds. For this purpose a seismograph with a natural period of one second would be better than an instrument of either the accelerometer or displacement-meter type.

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