astatic galvanometer

astatic galvanometer

noun Electricity.
a galvanometer that is unaffected by the earth's magnetic field and is used for measuring small currents.

Origin:
1865–70

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
astatic galvanometer

noun
has a moving magnet and astatic coils arranged to cancel the effect of the Earth's magnetic field 
WordNet® 3.0, © 2006 by Princeton University.
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