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HISTORICAL DEVELOPMENT OF THE TELEPHONE
MICROPHONES MOVING CONDUCTOR IN A MAGNETIC FIELD
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acoustic acoustic impedance air chamber amplifier amplitude angle applied axis baffle barium titanate cardioid compliance condenser microphone cone constant coupling coefficient crystal curve cycles damping developed diameter diaphragm directional characteristics driving efficiency electret electrical electrical impedance electroacoustic electromechanical electrostatic equation equivalent circuit force frequency range given high frequencies high-frequency increase inductance length loud speaker loudspeaker low frequencies magnetic field magnetostrictive mass loads material measured mechanical impedance mechanical system motional impedance moving coil obtained ohms oscillator output paper Patent phase phragm Phys piezoelectric plate pressure element quency radiation radiation resistance ratio reactance reproduced resistance resonant frequency result ribbon microphone Rochelle salt sensitivity shown in Fig sound pressure sound wave stiffness submarine thickness throat tion transducer transformer transmitter tube underwater unit vacuum tube values velocity vibration voice coil voltage