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3-inch Microphone Diaphragm able to tune acoustic mass acoustic radiation alternating current supplied applied pressure brass chamber calculated carbon button carbon granule connected Continuous Tuning copper tube damping due diaphragm mass diaphragm of uniform diaphragm vibrating dissipated elastic hysteresis losses elastic limit elastic restoring force frequency in air frequency meter fundamental pitch gaseous pressure given pitch heavy rim high an elastic inductances insulated lbs./sq limit as possible Method of Tuning microphone button microphone contact microphone receiver numbers obtained piston diaphragm pressure or suction range of tuning ratio resonance frequency return circuit rigid centre rigid mounting sensitivity and sharp sharp tuning shown in fig soldered contacts solid central portion solid centre solid of revolution sound-receivers steel diaphragm Steel.—Young's modulus 30 stress-intensity submarine acoustic submarine sound-generators telephone head-piece theoretical frequency-range thin annulus Tunable Diaphragm tuning curve Tuning Diaphragms tuning possible type of diaphragm Variation of resonance vibrating in air Vreeland Oscillator