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Introduction Historical Context
Electromechanical Coupling General
Reciprocity and Symmetry Considerations in Electromechanical
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acoustic admittance air gap algebraic analysis appear application April armature behavior Bell Bell's blocked impedance Cady capacitance carbon microphone components condenser condition cone configuration crystal curve described diameter diaphragm direction effect elec electric impedance electric mesh electric networks electroacoustical electrode electromagnetic electromechanical coupling electrostatic loudspeaker equations equivalent circuit ESLU example experimental expressed filed flux follows force factor function G. W. Pierce harmonic hysteresis inductance invention issued January July Langevin linear load locus loop magnetic circuit magnetic field magnetostriction magnitude maximum efficiency measurements mechanical impedance mechanical mesh mechanical resonance mechanical system Meter microphone motional impedance moving-armature moving-coil newton meter October operation patent phase angle phonograph physical piezoelectric polarizing push-pull radio ratio reactance represents resistance resonance frequency shown in Fig signal single-sided sound radiation stiffness telegraph terminals tion trans transducer transduction coefficient transformer transmitter variables variation vector velocity vibration voice coil voltage