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A simple technique of determining the superconducting transitions of small and irregularly shaped samples of superconducting material is applied to the determination of the transitions and critical magnetic field curves of tin and vanadium. The zero-field transitions and critical field curve for tin agree well with previous determinations. The vanadium was found to have broad transitions in zero magnetic field and critical field slopes of over 4000 gauss per degree. The critical field curve of the vanadium was verified by measurements with a susceptibility balance.
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Webber et al. (1949) studied this question.
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