Each dowel rotated each way when its corresponding pneumatic pair pushed or pulled it. The pneumatics are connected to a row of dowels. There is a corresponding set of pneumatics on the other side of the machine that returned the swell pedals to "closed" position. The pneumatics shown operated the swell pedal linkages that caused the console's swell pedals to depress when the organist manipulated the swell indicator "bobbers" manually thereby allowing the organist to control the organ's swell pedals by hand. As an example, it shows the rear of the Wurlitzer/Hope Jones "Balanced Swell" system machine at lower left. The photo to the left is of the rear of the four-manual console that controlled the Wurlitzer organ in the Denver Municipal Auditorium. Updated through online information from Eric Schmiedeberg.
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