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Mica condensers as standards of capacity (eBook)

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Various methods for measuring capacity, with alternating and direct current, and the advantages and disadvantages of each, are discussed. For this particular investiation the series inductance method was preferred, and was used almot exclusively. There is a wide variation in the temperature-coefficient of mica condensers, and in seeking the cause of this it was observed that of 2 condensers of similar capacity the one with the larger temperature-coefficient was the thicker. In a particular case where the coefficient was 32 parts in 100,000 per 1 degrees the condenser was placed in molten paraffin, compressed in a vice, and left until cold. The result was an increase in the capacity

Various methods for measuring capacity, with alternating and direct current, and the advantages and disadvantages of each, are discussed. For this particular investiation the series inductance method was preferred, and was used almot exclusively. There is a wide variation in the temperature-coefficient of mica condensers, and in seeking the cause of this it was observed that of 2 condensers of similar capacity the one with the larger temperature-coefficient was the thicker. In a particular case where the coefficient was 32 parts in 100,000 per 1 degrees the condenser was placed in molten paraffin, compressed in a vice, and left until cold. The result was an increase in the capacity


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