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GMEG - Geophysics Unit of Menlo Park, CA- (GUMP)


Geophysics Unit of Menlo Park, CA (GUMP)

U.S. Geological Survey - Western Region - Geology and Geophysics

USGS Rock- and Paleo-magnetics Laboratory

Thermal Demagnetizer

Thermal Demagnetizer

This instrument was designed and constructed in the late 1970’s. It was designed to partially demagnetize standard-sized paleomagnetic samples by heating them. The furnace is enclosed in a mu-metal shield that has an internal magnetic field less than 5 nannoTesla (nT). Four samples can be placed on each of ten shelves in the furnace, and temperatures are constantly monitored by ten individual thermocouples. Heatings are performed in air up to a maximum temperature of 700 degrees Celsius.

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