Bottom portion of the restored
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![]() The feeder bellows supply both vacuum (to operate the various mechanisms) and wind-pressure (to blow the violin pipes). A round leather belt between the motor and the large pulley operates a chain and sprocket gear type of speed reduction that rotates the pump's crankshaft. The vacuum reservoir is at the left end of the pump, while the wind-pressure reservoir is on top of the pump, its two leaf-springs visible between the reservoir top and the bottom of the support shelf above it. |
At the top half of the picture is the main valve chest, which sits on the wooden shelf just above the pump bellows. The small lead/tin alloy tubes rising vertically connect individual control valve pouches to the holes in the tracker bar (which in turn reads the perforations in the music rolls). |