Tibia Clausa

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Tibia Clausa

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A Tibia Clausa is a large-scale, stopped wood flute pipe, usually with a leathered lip. Tibia Clausas provides the basic foundation tone of the organ with few overtones or harmonics. The Tibia Clausa is arguably the most important rank of pipes in a theatre pipe organ, with some organs having as many as 5. The stop shares similarities with the Bourdon and the Gedackt
Gedackt

Gedackt is the name of a family of stops in pipe organ building. They are one of the most common types of organ flue pipe. The name is a German word, meaning "capped" or "covered"....
found in some church pipe organs. In the 18th and 19th centuries, Tibia Clausa was sometimes used as an alternate name for Doppelflüte. Most tibias are made from wood, although a few examples of metal tibias may be found.

The Tibia Clausa, or Tibia, is generally found at 16′, 8′, 4′ and 2′ pitches as a unified rank. The mutation ranks Tibia Quint 5 1/3′, Nazard 2 2/3′ and Tierce 1 3/5′ are also drawn from this unified rank of 97 pipes. In some larger organs, a second Tibia rank may be present, extended to 1′ instead of 16′, allowing a 1 1/3′ Nineteenth mutation and a 1′ Piccolo to be drawn from this rank. A few of the largest theatre organs, and some church organs, may have a separate 32′ Tibia Clausa rank of 12 pipes. In smaller organs, a Bourdon or Stopped Diapason
Flue pipe

A flue pipe is an organ pipe that produces sound through the vibration of air molecules, in the same manner as a recorder or a whistle. Air under pressure is driven down a Flue and against a sharp lip called a Labium, which causes the column of air in the pipe to resonate at a frequency determined by the pipe length....
may be substituted for a Tibia Clausa at 16′ pitch.

The Tibia may be voiced on wind pressures from 10″ to 25″ WP (water pressure). The Tibia is generally used as a chorus stop, with or without tremulant; it is not normally used as a solo stop due to its relatively dull tone.

Other variants of the Tibia Clausa include: Tibia Bass, Tibia Flute, Tibia Major, Tibia Plena (open tibia) and Tibia Rex.