Magnetic amplitude

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the angular distance of a heavenly body, when on the horizon, from the magnetic east or west point as indicated by the compass. The difference between the magnetic and the true or astronomical amplitude (see 3 above) is the "variation of the compass."
etc. See under Amplitude, Attraction, etc.

See also: Amplitude, Magnetic

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Firstly, all measurements were actual deviations in magnetic amplitude from a zero point.
At Bundaroo the 25km-long target is interpreted to be a substantial open folded iron formation with similar magnetic amplitudes to the existing Wubin DSO and magnetite targets.