The Earth inductor compass (or simply induction compass) is a compass that determines directions using the principle of electromagnetic induction, with the Earth's magnetic field acting as the induction field for an electric generator. The electrical output of the generator will vary depending on its orientation with respect to the Earth's magnetic field. This variation in the generated voltage is measured, allowing the Earth inductor compass to determine direction.
1912-12-17, assigned to Henschel, Charles J US granted 2434324, Lehde, Henry, "Earth inductor compass", issued 1948-01-13, assigned to Control ...
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