12" discs of Paris Compagnie Générale d'Electricité recorded using hill-and-dale (aka Edison) method. The nominal speed is 90 RPM, playing starts from the center of the disc.
9" discs of Paris Compagnie Générale d'Electricité recorded using hill-and-dale (aka Edison) method. The nominal speed is 80 ? RPM, playing starts from the center of the disc.