situated that only a tremor of the earth itself ————_—_——_+ 0 can affect it, but although its utility for recording the the United States by which the time and duration of Superstition of a Well-Known Writer. earthquakes can be recorded. time and duration of seismic shocks has been fully There are… … 900 revolutions per minute and gear directly with asin- time, held the belief that the number 17 had a malign THE MARVIN SEISMOGRAPH. gle reduction to the internal gears on the 36 inch driving influence upon him, and that aggravated the case. wheels. As the motors are independent, the differen- Dr.…
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