A development of the vibrating-capacitor method is described. It is used for the measurement of contact potential-differences between a standard electrode and an area of about 1 square millimetre of a metal surface immersed in an insulating liquid. Discrimination against circuit noise is achieved by homodyne rectification. A novel form of drive for the vibrating-capacitor is used. Contact potential differences may be measured to an accuracy of 0.1 mV.
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Macfadyen et al. (1957) studied this question.
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