The World of Sound

aeroplane apparatus ball bird-call black keys blows bull-roarer C. V. Boys cavity centre cochlea column deep notes definite difficulty direction disc drop easily edge effect electric experiment explosion fact fall feet figure shows filled finally find fine finger first fish five fixed flame flare flat flow fundamental note geophone give goes happens hear heard holes human voice hydrophones inches instrument light listening Lord Rayleigh ment mercury metal microphone 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 reflector ripple tank ripples round sensitive side sound travels sound-waves string vibrate submarine sufficient surface swing tank thing touch tube tuning-fork turn velocity Vhen wall waves wheels whirls whistle wind wire