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| tan·gent gal·va·nom·e·ter (plural tan·gent gal·va·nom·e·ters) |
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instrument for measuring Earth's magnetic field: a device with a compass needle suspended horizontally in a vertical coil through which a direct current is passed, causing deflection of the needle proportional to the size of the current. It can be used to calculate the strength of the Earth's magnetic field.
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