Lehman Seismometer in Classroom

seismometer in rear of classroom

The 18-second period Lehman horizontal seismometer is located in rear of the Earth Science classroom.  The home-made Plexiglas case keeps air currents from affecting the seismometer boom.

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This seismometer is located on a metal table because experience with a prior wooden table indicated that the wood varied too much with the changes in relative humidity as the building cycled between the cooling and heating seasons.