LETTER VIII.. Musical and Harmonic Sounds Explained--Power of Breaking

Musical and harmonic sounds explained--Power of breaking glasses with the voice--Musical sounds from the vibration of a column of air--and of solid bodies--Kaleidophone--Singular acoustic figures produced on sand laid on vibrating plates of glass--and on stretched membranes--Vibration of flat rulers and cylinders of glass--Production of silence from two sounds--Production of darkness from two lights--Explanation of these singular effects--Acoustic automaton--Droz’s bleating sheep--Maillardet’s singing-bird--Vaucanson’s flute-player--His pipe and tabor-player--Baron Kempelen’s talking-engine--Kratzenstein’s speaking-machine--Mr. Willis’s researches 179