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Manual Telephone Systems
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alternating current alternating voltage alternating-current ampere amplifier antiresonance armature attenuation battery cable Calculate called line calling party capacitance carbon granules cause central office characteristic impedance circuit of Fig common-battery components condenser connected connector contacts cord circuit crosstalk current flow cutoff decibels device diaphragm direct current direct-current distant end distortion electric electromotive force electrons energy equipment explained farads filter grid impressed voltage impulses indicated input impedance insulation line switch line wires lines of force load loading coils loss magnetic field measured milliamperes noise ohms open-wire line operator output pair parallel circuit permanent magnet phantom circuit plate positive previously produced relay repeating coil resistor ringers ringing selector series circuit shown in Fig shunt side band sidetone signal sound waves speech switchboard telephone circuits telephone line telephone receiver telephone set telephone systems telephone transmitter terminals toll transmission trunk vacuum tube vector voice-frequency voltage drop voltmeter volts