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The application of an automatic circuit for the periodical compensation of drift in dc amplifiers is described. The circuit consists principally of a relay and memory condenser and is analogous to that described by Offner Rev. Sci. Instr. 25, 579 (1954). The difference is mainly in the application. Whereas Offner used the circuit to restore the balance in differential amplifiers, here it is applied to the drift compensation of an unbalanced straightforward or feedback dc amplifier.
Cederbaum et al. (1955) studied this question.