organ [4]

Wind instrument with several keyboards; it produces sound by means of pipes that are fed by a blower.

mechanism of the organ

All the parts between the manual keys and the pipes; in combination, they cause the organ to function.

rackboard

Board with holes into which the pipes fit to hold them in an upright position.

upperboard

Board with holes that correspond to those of the sliders and the wind chest table; the feet of the pipes sit in these holes.

rackboard support

Base on which the rackboard rests.

slider

Movable wooden board with holes matching those of the upperboard, making it possible to sound a specific row of pipes.

bearer

Each of the fixed boards between which the sliders move; their function is to guide the sliders.

bottomboard

Pressurized air chamber located in the lower part of the wind chest.

wind supply

Passage of air from the bellow to the pipe.

wind trunk

Conduit that air from the bellow passes through on its way to the bottomboard.

pallet spring

Spring that brings the pallet back into the closed position.

stop rod

Part controlled by the stop knob; its function is to move a slider.

stop knob

Device attached to a stop rod that controls the slider, which allows a row of pipes to sound or remain silent.

tracker

Strip of wood that is pulled by a key to control an arm.

roller board and arms

Group of trackers and rollers connecting the keys of a manual to the corresponding pallets.

key

Lever pressed by the fingers that, through various mechanisms, lowers a pallet.

manual

Series of keys the organist plays by hand; they control a specific group of pipes.

air sealing gland

Small sac of flexible skin that makes the bottomboard airtight around the rod controlling the pallet.

pallet

Movable piece of wood controlled by a key; when the key is lowered, air enters a passage connecting all the pipes of the same note.

wind chest table

Piece of wood with holes into which the sliders slide.

pipe

Tube in which sound is produced by a vibrating shallot (reed pipe) or by air friction in an aperture (flue pipe).