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Joseph Hunter Dickinson
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2378. Dickinson, J. H. Feb. 1. Tracker-bars.-In an automatic musical instrument, the tracker-bar is provided with two series of ducts for tune-sheets of different compasses, and sets of pipes, such as 11, 12, connect these ducts to two series of chambers 13, one series of which may be put into communication with ducts 16 leading to the action. If the valve 32 is in the position shown, the chamber 17 is open to the atmosphere so that the diaphragm 14 is pressed against its seating. The chamber 17, on the other hand, is connected to exhaust through the pipe 30<1> owing to the position of the valve 32<1>, so that if air is admitted through one of the pipes 12, it passes behind the diaphragm 14<1> and through the pipes 15, 16 to operate the primary pneumatic. If the positions of the valves 32, 32<1> are reversed, the other set of pipes is connected to the action. The apertures in the tracker connected to the pipes 11 are larger than the apertures connected to pipes 12, and the bleed-holes 18 are made correspondingly larger than the bleed-holes 19.
GB190902378D1909-02-011909-02-01Improvements in Adjustable Tracker Boards for Automatic Musical Instruments.
ExpiredGB190902378A
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