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An organ pipe is one of the tuned Resonator s that produces the main sound of a Pipe Organ . Most organ pipes are either long cylindrical metal tubes or elongated wooden boxes of rectangular cross-section.

Organ terminology varies a great deal from period to period, style to style and even from builder to builder. This article gives the most common usages only.

There are two types of organ pipes, classified by the way they are driven:

  • '' Flue Pipe s'' -- driven by whistles or Fipple s. Most organ pipes are flue pipes. Flue pipes are themselves divided into three broad classes:

  • --- '' Flute Pipe s'' have the purest tones, and are generally the widest.

  • --- '' Diapason s'' are intermediate in tone, and are the basic sound of the pipe organ.

  • --- ''String tone pipes'' have the richest harmonics, and tend to be the narrowest pipes.

  • '' Reed Pipe s'' -- driven by a beating Reed .


See also Variations In Timbre Of Organ Pipes .

There is another way of dividing pipes into two broad classes:
  • ''Open pipes'' are open-ended. An open pipe producing Middle C is about two feet in length.

  • '' Stopped Pipe s'', also known as ''closed'' or ''gedackt'' (from the German for ''covered'') are closed at the end opposite the reed or the fipple. A closed pipe is almost exactly half the length of an open pipe sounding the same note.


Stopped pipes are used for two main reasons:
  • They tend to be gentler and sweeter in tone. Some builders even go so far as to refer to any stopped flue pipe as a ''flute''.

  • Stopped pipes for deep bass notes that would otherwise be difficult to fit into the organ chamber are more easily accommodated, and also cheaper to build. In some organs, the bass notes of an otherwise open rank of pipes are stopped for this reason alone.



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