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aeroplane apparatus ball binaural bird-call black keys blue bow is drawn bull-roarer C. V. Boys cavitations cavity centre cochlea column comes deep notes definite pitch direction disc double spring drop easily edge effect electric experiment explosion fact fall feet finger fish fundamental note geophone give glass goes happens hear heard holes human voice hydrophones illustration inches instrument light listening Lord Rayleigh ment mercury metal microphone miles mirror monochord motion mounted move movement musical box musical scale node noise observer octave overtones pass pendulum piece pipe pitch plate pluck position pressure pulses quivers reed reflected ripple tank ripples round rubber sensitive flame shows side sound travels sound-waves string vibrate submarine surface swing tank thing touch tube tuning-fork turn velocity violin wall waves wheels whirls whistle wind note wire