HOW ORGANS WORK

SCHEMATIC DRAWINGS OF MECHANICAL ACTION ORGANS

DIRECT ACTION

When the bellows (1) are raised manually, air (wind) enters them through the feeder valve (2). The bellows slowly deflate, pushed down by their weights (14), which sends air through the wind trunk (3) towards the pallet box (6) at a predetermined pressure.

When depressed, each key (7) pulls down its corresponding pallet or valve (5), allowing the air stored under pressure to be directed through channels in the wind chest to the corresponding pipes (13).

Grooves (9), sliders (10) and toeboards (11) together make up the wind chest.

The pipes sound because of the combination of the wind system (bellows, wind trunk, wind chest), key action (key, tracker, pallets) and stop action (slider tabs, sliders). 

Each register or row of pipes is controlled by pushing or pulling the slider tabs which protrude from the sides of the organ (10). These move the interior sliders sideways and allow the air to pass from the wind chest to a particular rank of the pipes, if sound is desired, or to close off the air passage if those pipes are not meant to sound.

FEATURED ORGANS WITH DIRECT ACTION

San Andrés Zautla
Sta. Ma. de la Natividad Tamazulapan
San Andrés Huayapam

San Pedro Mártir Yucuxaco

San Pedro Quiatoni

San Dionisio Ocotepec

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SUSPENDED ACTION

When the bellows (1) are raised manually, air enters them through the feeder valve (2). The bellows are then slowly pushed down by their weights (14), sending air through the wind trunk (3) towards the pallet box (6) at a predetermined pressure.

When depressed, each key (7) pulls down its corresponding pallet or valve (5), allowing the air stored under pressure to be directed through channels in the wind chest to the corresponding pipes (13).

Grooves (9), sliders (10) and toeboards (11) together make up the wind chest.

The pipes sound because of the combination of the wind system (bellows, wind trunk, wind chest), key action (key, tracker, rollerboard, pallets) and stop action (stop knobs, sliders). 

Each register or row of pipes is controlled by pushing or pulling stop knobs on the front of the organ (10). These move the interior sliders sideways and allow the air to pass from the wind chest to a particular rank of pipes, if sound is desired, or to close off the air passage if those pipes are not meant to sound.

 FEATURED ORGANS WITH SUSPENDED ACTION

San Jerónimo Tlacochahuaya
La Basílica de la Soledad
La Catedral de Oaxaca
San Matías Jalatlaco
Santo Domingo Yanhuitlán

La Asuncion de María Tlacolula

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