Speed-Correcting Phonautograms Without Pilot Tones
I always find it hard to put into words what’s uniquely special about the phonautogram of “Au Clair de la Lune” recorded by Édouard-Léon Scott de Martinville on April 9, 1860. On one hand, it stands out for the central role it’s played in the recent history of the playback of the world’s oldest recorded…