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| Keywords: Cours de physique de l ecole Polytechnique - ed 2 vol 2 1868 p629 - phonautogram.png en Several phonautograms resulting from the superposition of two sine waves from different tuning forks fr Plusieurs phonautogrammes résultant de la superposition de deux ondes sinusoïdales provenant de différents diapasons Jules Jamin Edmond Bouty http //books google com/books id XvEGAAAAcAAJ pg PA629 Cours de physique de l'École Polytechnique ed 2 vol 2 p 629 fig 515 Book Jules Jamin Edmond Bouty “ Phonautogram unknown ca 1868 PD-old Phonautographs | ||||
