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A variable inductor used to measure variations in terrestrial magnetism.
1. (General Physics) an instrument for measuring variations in a magnetic field, used esp for studying the magnetic field of the earth
2. (Electrical Engineering) electronics a variable inductor consisting of a movable coil mounted inside and connected in series with a fixed coil
3. (Aeronautics) a sensitive rate-of-climb indicator, used mainly in gliders
var•i•om•e•ter(ˌvɛər iˈɒm ɪ tər)
1. a two-coil inductor in which electrical inductance is varied by rotating one coil within the other.
2. an adaptation of this used for detecting changes in the earth's magnetic field.