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adjustment alternating current ammeter ampere-hour amperes antenna antenna ammeter antenna circuit apparatus arc transmitter armature audio automatic starter battery broadcast capacitance cause cell charge choke coils chopper class of license commutator connected in series coupling crystal crystal detector current flows cycles d-c line detector diaphragm direct current discharge distress electrolyte electron field rheostat filament frequency grid leak hand key headphones high-frequency indicated inductance installation kilocycles magnetic meters microphone modulator Morse Code motor armature motor-generator negative normal obtained operation oscillations oscillatory circuit output overload plate circuit plate current plunger bar position potential primary Protective condenser radiated radio radio-frequency radiotelegram receiver relay resistance resistor resonance secondary sending ship short-circuit shown in Figure signal solenoid spark transmitter station supply switch tank circuit terminals transformer transmission transmitting tubes tube transmitter tuning vacuum tube voltage voltmeter volts wave wavelength wavemeter wire words