GENERAL VIEW OF MAINKA SEISMOGRAPH 



Presented to the New York Academy of Sciences by Emerson McMillin, president of the Acad- 

 emy, and deposited in the American Maseum of Natural History. It Is the largest seismograph in this 

 country and was made at the order of Mr. McMillin by J. and A. Bosch of Strassburg. It is installed 

 in the corridor off the North Pacific hall where freedom of motion uninfluenced by surroundings was 

 obtained by means of a concrete pier firmly cemented to the solid rock beneath the building. The first 

 record of the new seismograph was made by an earthquake in Alaska (3100 miles away) on the morning 

 of November 7. This record is on exhibition. Like all seismographs, the instrument is sensitive 

 to barometric changes, heavy wind, and wave beats on the sea beach, all of which cause pressure on 

 the surface of the earth 

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