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HOW ORGANS WORK

SCHEMATIC DRAWINGS OF MECHANICAL ACTION ORGANS

 

SUSPENDED ACTION

 

1 Bellows
2 Valve
3 Wind trunk
4 Spring
5 Pallet
6 Pallet box
7 Key
8 Tracker
9 Groove
10 Slider
11 Toe board
12 Grooved board
how does an organ work
13 Pipe
14 Weight
15 Case
16 Trundle
17 Roller
18 Roller board
19 Stop knob
20 Pivot
21 Stop action backfall
22 Air enters bellows
23 Air enters organ
 

To print a quality version of this schematic, download suspended_action.pdf (1.1MB)

 

SUSPENDED ACTION (ENLARGEMENT)


1 Bellows
2 Valve
3 Wind trunk
4 Spring
5 Pallet
6 Pallet box
7 Key
8 Tracker
9 Groove
10 Slider
11 Toe board
 
how does an organ work
12 Grooved board
14 Weight
16 Trundle
17 Roller
18 Roller board
19 Stop knob
20 Pivot
21 Stop action backfall
22 Air enters bellows
23 Air enters organ
 

 

 

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.

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

 

 

DIRECT ACTION

1 Bellows
2 Valve
3 Wind trunk
4 Spring
5 Pallet
6 Pallet box
7 Key
8 Tracker
9 Groove
how does an organ work
10 Slider
11 Toe board
12 Grooved board
13 Pipe
14 Weight
15 Case
16 Table
17 Air enters bellows
18 Air enters organ

To print a quality version of this schematic, download direct_action.pdf (744 KB)

 


DIRECT ACTION (ENLARGEMENT)

1 Bellows
2 Valve
3 Wind trunk
4 Spring
5 Pallet
6 Pallet box
7 Key
8 Tracker
how does an organ work
9 Groove
10 Slider
11 Toe board
12 Grooved board
14 Weight
16 Table
17 Air enters bellows
18 Air enters organ

 

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.

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