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a.c. supply acoustic adjusted amplitude modulation bias British Patent capacitance capacitor characteristic circuit arrangement coil complex tone connected control tube corresponding Coupleux and Givelet decay disc effect electric piano electromagnetic tone Electronic Engineering electronic instruments electronic musical instruments electronic organ electrostatic elements energy Equal Temperament formant fundamental grid guitar Hammond organ Hanert harmonics intervals key is depressed keyboard lamp Langer loudspeaker magnetic mechanical ment method Midgley Miessner mounted neon-tube Novachord obtained octave operation output pedal clavier photocell photoelectric pick-up electrodes pipe organ pitch playing keys polarising potential polarising voltage potentiometer principle produced Radio radio-frequency oscillators range ratios reason reed resistor reverberation ring rotary system rotating scale semitones shown in Fig sinusoidal sound soundboard speed string suitable switches Theremin thyratron tone colour tone frequency tone quality tone wheels tone-generator transformer Trautonium tremolo tuned circuit U.S. Patent variation varying vibration Vierling voltage watt wave-form wave-patterns