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Each keyboard uses pipes spread over one
or more windchest. An organ with three manuals and pedals therefore generally
contains at least four windchests.
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  Windchests contain the distribution system for air, or wind as
it known in organbuilding. On the upper side of a windchest stand the different
ranks of pipes (stops). Underneath each pipe there are two windseals. One is
operated by a note on the keyboard (a pallet valve), the other by the
corresponding stop action (the slider). Whenever these valves are opened, air
flows from the windchest into the pipe, causing a note to sound. |
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