Early Style Belt and Pulley Speed Reduction System in the
Wurlitzer Style 33 Mandolin PianOrchestra
Philipps Pianella Model Silvana-Xylophon
(Krughoff collection; Tim Westman restoration)
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The belt driven crankshaft operated feeder bellows (or pump) in the Style 33 PianOrchestra produces both wind-pressure (to blow the pipework) and a vacuum (to operate the valve chests and other pneumatically motivated mechanical devices).
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