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Dave Thomas | all galleries >> Out and About in Southeastern PA >> Philadelphia Scenes >> Wanamaker Organ > Regulator
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A large box with one movable surface fastened by a leather bellows-like
section. Weight is placed on the movable part to create a reservoir that
regulates the wind pressure in the line to which it is attached.

Canon PowerShot A80
(A7501) 1/10s f/2.8 at 7.8mm full exif

other sizes: small medium original