Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 377
ment which re-cords the motion of the earths crust when itis made to vibrate under the action of anearthquake. Even the minute vibrations dueto the motion of passing railway trains, etc.,can be recorded, but the real earthquake vi-brations are, as a rule, much greater and canbe recorded at \ery… … A SEISMOGRAPH.Printed through the courtesy of the Weather Bureau. vibration, and these vibrations have beenmeasured throughout the civihzed world byseismographs similar to the one shown in theillustration. The large mass, C, of the seismograph, weigh-ing about thirty or forty pounds, is suspendedin…
Children's literature
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