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Three different circuits for use with a single vacuum tube in order to balance out effects of fluctuations of the e.m.f. of the plate battery are described. The theory of the circuits is worked out and the expressions for the galvanometer current given. The circuit in which the stability of balance depends upon the constancy of the amplification factor, μ, is found to be the most stable. A modified two tube circuit operating on this principle is suggested.
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Louis A. Turner (1933) studied this question.
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