Tremulant
A tremulant (from
The tremulant should not be confused with the celeste, which consists of two distinct ranks of pipes, one tuned slightly sharp or flat from the other, producing an undulating effect when they are used together.
Construction
The simplest kind of tremulant is a weighted electric motor affixed to the top of the reservoir for the division. When activated, the spinning of the motor causes the reservoir to shake, altering the wind pressure. This type of tremolo appeared first in the twentieth century, when the electric motor became available.
The tremblant fort (French: "strong tremulant") allows an escape route for some of the wind in the wind trunk. The loss of wind creates the tremulant effect.
The tremblant doux (French: "sweet tremulant") was illustrated by Dom Bédos de Celles in his monumental L'art du facteur d'orgues. It consists of a spring-loaded flap that is mounted inside the wind trunk of a division. When the tremulant is engaged, the flap drops into the wind trunk and bounces as the wind passes by it. The spring allows the flap to rebound repeatedly back into the wind supply, which creates the undulation. Both the tremblant fort and the tremblant doux were commonly seen on German organs of the 17th and 18th centuries.
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Tremulant mechanism (Salomon de Caus, 1615)
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Wippfeder-tremulant (rocking spring-tremulant), built during 1848-60 by Arnold Rohlfs organ. (St. Magnus Church in Esens)
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The interior of an 1895 Mason & Hamlinstop mechanism, swell case and Vox humanatremulant.
References
- Pykett, Colin (18 August 2009), Tremulant Simulation in Digital Organs
- ISBN 978-1-56159-239-5.
- ^ Pykett 2009
- ISBN 0-521-57584-2.
External links
- Multi media
- The tremulant of the Taylor and Boody organ for The First Presbyterian Church in Pittsford, New York
- Taylor and Boody's Latest Tremulant (video). [Sound] "Very quiet and effective."
- Organ Tremulant (video). [Mechanism] "The tremulant copied from memory from the one in the Paul Fritts organ at Notre Dame University. This tremulant gets its wind directly from a valve on the main bifurcation windline, through a 1" copper tube about 6" long. It is almost identical to the one in the organ in Marquand Chapel, Yale University."