EDI178887 A Woman listening to an opera performance in her own home by means of the Ader-Bell telephone and Ader\'s arrangement for music transmission, from \'Les Nouvelles Conquetes de la Science\' by Louis Figuier, 1883 (engraving) by French School, (19th century); Ann Ronan Picture Library; (add.info.: microphones placed on either side of prompt box on stage and a different signal was received through each earpiece giving a stereophonic effect;); French, out of copyright.