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§ 1. The apparatus for the measurement of remanence (Jrn, Jrs, Jrc) of magnetization JK and of susceptibility K of rocks [see sections “ Literature,” Part I and Part II] are of two kinds: (a) Magnetometers, chiefly astatic [I, 1926c and 1927a, b, etc.], some showing a weak field at the position where the sample is placed, with compensation of the deflection, which requires a regular shape of specimen in measuring remanence or susceptibility [I, 1930c]; the sample may be put in a coil with a known magnetic field to measure JK for different values of H [I, 1930a, p. 273].
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J. G. Koenigsberger (1938) studied this question.
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