A variable inductor used to measure variations in terrestrial magnetism.
Any of various devices designed to measure or record small variations in some quantity, as air pressure.
A geophysical instrument for measuring magnetic forces or determining variations of magnetic force, esp. at different places on the planet earth.
(electronics) A continuously variable inductor consisting of a coil mounted within and in series with a fixed coil, with the inner coil capable of rotation so as to vary the total inductance.
A rate-of-climb indicator.
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