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acoustic energy acoustic impedance acoustic wave alternating current aluminum amplifier amplitude amyl acetate applied audio bration caesium cali calibration capacitance cathode caused cellophane characteristic resonance frequency condenser microphone conductor construction Cornell University crimp the ribbon decrease denominator diaphragm direct current directional characteristic directly proportional displacement electric microphone equation expression frequency response Grenada higher frequencies housing inch wide independent of frequency investigation lens system low frequency magnetic field mass reactance maximum mechanical impedance metallic ribbons method moving element noise output particle velocity photo-electric current photo-electric microphone piston phone plates pressure acting pressure gradient microphone pressure gradient operated pressure microphone pressure ribbon microphone quency ratio Rayleigh disc resistance resistor response characteristic response frequency characteristic shutter sides slit of light sound pressure sound wave standard microphones stiffness reactance theory thereby thickness transducers type microphone type of microphone vacuum tube velocity microphone vibrating element voltage is induced wave length