The Talking Machine Patent Archive

Patents you could hear

Tension regulator

Patent drawing of a player-piano mechanism showing a paper music roll, tracker board, divided wind-chest with valve casings, and two pivoted hand levers positioned near an indicating scale for controlling bass and treble tension independently.MEANS FOR CONTROLLING THE TENSION IN WIND WAYS OF MECHANICAL-MUSICAL-INSTRUMENT PLAYERSJoseph H. Dickinson · January 17, 1905