INSTRUMENTS designed for measuring movements of the earth's crust belong to two classes. The first consists of seismographs which register the amplitude and period of the rapid vibrations of ...
SOME interesting readings of the bifilar pendulum, designed by Mr. Horace Darwin for measuring movements in the earth's surface, were made here at noon on the 9th inst. This instrument, which ...
Francis Anthony Tondorf, S.J., director of the newly established seismological laboratory at Georgetown University, ordered several new seismographs in 1911. This one, which was advertised as “Dr.
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