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NEW SEISMOGRAPH NOT DISTURBED BY TRUCKS

Instrument is Moved From Geological Museum to Solid Rock in Portland, Maine

NO WRITER ATTRIBUTED

If the State of Maine trembles, the Department of Geology will know it, for a seismograph station is being established in the Portland home of Roger L. Arringdale at 211 Ocean Avenue. Directed by Arringdale, the new staton will be in operation within a month.

To keep accurate check on Mother Earth, three instruments will be installed, one to record north-south tremors, one for east-west motion, and a third for up-and-diwn movements. In 1928 the Department set up a seismograph in the basement of the Geological Museum. However, the instrument was so delicate that an earthquake was recorded whenever a class was dismissed or a truck rumbled by. Even the movements of the night watchman could be traced on its record.

Consequently the equipment was transferred to a special concrete room at the Oak Ridge Observatory, based on solid rock. Continual observations are made here, and the station cooperates with others in locating quakes, using radio communication.

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