Telephone Apparatus: An Introduction to the Development and Theory |
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air-gap alternating currents Amer amperes Appendix armature battery bell capacity carbon centimeter central energy components condenser conductor connected cord circuit counter-electromotive force cuits curve diaphragm dielectric difference of potential direct current distance disturbances effect Elec electric circuit electromagnetic electromotive force electrostatic equal equation exchange footnote frequency gong hysteresis impedance increase induction coil Inst insulation iron core Jour Kennelly less magnetic circuit magnetic field magnetic flux magnetomotive force maximum MCMEEN and MILLER microphone netic number of turns ohms operator OSCILLOGRAMS path permanent magnet permeability Phil pitch polarized ringer pole pole-changers Proc proportional pull pulsating reactance relay reluctance rent repeating coil resistance resonance retardation coils ringing secondary currents self-induction shunted signaling sinusoidal sound strength tele telegraph telephone receiver Telephonology tion Trans transmitter U. S. Patent VANDEVENTER variation varies voice currents voltage windings wire Аввотт