Pipe Chest physically supports the pipes and controls the air to each
Cross-section Diagram of Pipe Chest (not to scale)
Red Arrows indicate direction of parts travel
Blue Arrows show Exhaust Air direction
words Air and Wind may be used interchangeably
this diagram, all moving
parts are in the rest position
Wind supply from Blower (via
Regulator) fills Pipe Chest, channels and bellows of Pneumatic Motors
with positive pressure air.
Organist pressing Key on keyboard,
(via electronics) turns on
which attracts (3)
(small metal disc), holding disc up.
The positive pressure air to (4)
Primary Channel is now shut off.
Air exhausts from Primary Channel, via hole in (5)
Tube Screw to outside.
The positive pressure air against (6) Primary Motor bellows, causes bellows to collapse, raising attached (7)
Valve Wire with two Valve Discs.
The positive pressure air to (8) Secondary
Channel is now shut off.
The Secondary Channel exhausts its air to outside.
The positive pressure
air against (9) Secondary Motor
bellows, causes bellows to collapse. The
Striker, moves (11)
Spoon which pulls (12)
Pallet open, against the Spring
Wind is admitted into the Organ Pipe—and sound is heard!
sequence (2) to (12)
is FAST; capable
of 20 repetitions per second!