## Alternating Current Measurements at Audio and Radio Frequencies |

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### Contents

ALTERNATING CURRENT THEORY | 1 |

THE MEASUREMENT OF SELF INDUCTANCE AT | 22 |

THE MEASUREMENT OF MUTUAL INDUCTANCE | 39 |

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### Common terms and phrases

a.c. potentiometer accuracy alternate adjustments ammeter amplitude angle applied voltage balance was found calibration Carey Foster co-ordinate type coil under test conditions of balance connected crystal denote detector determination direct current e0 sin cot eddy currents effect of residual effective resistance equal equation Ex.—The formula harmonic heterodyne wave-meter high frequencies independent of frequency indicated induced e.m.f. inductive coil instrument magnitude meter mica condenser microhenries mutual capacitance mutual inductance mutual inductometer non-inductive resistance null method obtained ohms phase points potential divider power factor primary quadrature quartz oscillator quartz resonator quencies radio frequencies range reactance reading residual inductance resistance box resistance in series rotating vector shown in Fig shunt skin effect slide wires standard condenser steady current stray capacitance switch tance telephone terminals valve voltmeter variable air-condenser varying vector diagram vector impedance vibration galvanometer voltage volts Wagner earth Wheatstone bridge whence zero