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A commercially made lock-in amplifier and low-noise, high-gain preamplifier have been used in designing and constructing a spinner magnetometer for measuring the remanent magnetization of small rock specimens. The novel design features of the pickup coil transducer include the use of a compensated dual-coil array, aluminum eddy-current shielding, and radioactive electrostatic charge eliminators. The instrument detects specimen moments greater than 4 × 10−7 emu. This sensitivity corresponds to an intensity of magnetization of 4 × 10−8 emu/cm³ for the largest specimens accommodated (10 cm³). The error of direction and intensity measurement is less than 1° and 2%, respectively, for specimens with intensities greater than 2 × 10−7 emu/cm³.
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Phillips et al. (1967) studied this question.
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