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Dave Thomas | all galleries >> Out and About in Southeastern PA >> Philadelphia Scenes >> Wanamaker Organ > Wiring Header
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25-JUN-2011

Wiring Header

Turn of the 20th century pipe organs, especially large ones, used electro-pneumatic action
where electrical signals were amplified by having a small solenoid valve energize air operated
bellows, or sometimes direct electric action where large solenoid valves admitted air to the
pipes on signal. Either used low voltage direct current and involved lots of wire and connections.

Canon PowerShot A80
(A7493) 1/10s f/2.8 at 7.8mm full exif

other sizes: small medium original auto