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An apparatus is described with which the susceptibilities of small paramagnetic specimens can be determined at temperatures between 77 and 1.8° K. The measurements are made in terms of the change of mutual inductance produced by moving a specimen inside a coil system, using a Hartshorn bridge operating at 175 c/s to measure the inductance. The chief advantage of this type of apparatus is its simplicity of operation, since it involves no delicate moving parts. The sensitivity and reproducibility of the apparatus were investigated using a specimen of manganous ammonium sulphate and it was found that susceptibilities of the order of 3 × 10-6 c.g.s. units could be measured to an accuracy of 1%. Sources of error are discussed.
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McKim et al. (1957) studied this question.
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