Reed (organ)

Article

November 28, 2021

The reed is the element that produces the sound of the organ called "a reed", a musical instrument usually used in churches; the principle for which the classic sound is produced is based on the vibration of the air produced in the barrel itself. In ancient times, the pipes were grouped in orderly rows generally behind the keyboards but, with the advancement of pneumatic / electric / electronic technology, the pipes can be placed in any place and therefore placed where they are best for acoustics and spaces. of the environment. The portion of canes that are visible from the outside is called a facade or elevation.

Materials of construction

In the past, the most diverse and disparate materials such as silver, paper and cardboard, parchment with glue, bone, glass, gold, alabaster, copper, etc. have been used for the construction of the rods. Tradition generally tells us about the most used types: metal and wood as regards the labial canes (also called "soul"). With these two different materials it was possible to recreate, according to the given form, the instruments that one wanted to interpret. Generally the metal (lead and tin organ alloy) is used for the pipes of the Principale which recreate the classic sound of the organ, but also to recreate the sound of trumpets and horns. Wood, on the other hand, for the sound of flutes, drones and others.

Physical principle

Reeds are distinguished by the way in which sound is produced. The so-called core pipes, also called labial, work on the same principle as the recorder: the air, by cutting transversely on a labium, vibrates the air column, a physical principle of the dynamics of fluids completely similar to others aerophonic instruments such as flutes, whistles, ocarinas, etc. The so-called reed reeds, on the other hand, have a plate which, vibrating when the air passes, sets in motion the air contained in the reeds, thus producing sound. The length of the reed (resonator) denotes only the color of the sound, while the shape modifies its timbre.

Core barrel parts

The labial tubes of the organ consist of three parts: the "body", that is the upper part of the reed, also known as the resonator; the "foot", the lower cone of the reed, whose length and size do not modify the sound produced in any way; the "mouth", lateral opening to the barrel which is made between the upper part of the foot and the lower part of the body; it is visible in the reeds on the facade often embellished in the upper part with a decoration, the mouth of the reed can be a shield or a miter depending on the shape. Inside takes place a diaphragm called soul.

Parts of the reed barrel

Compared to the core rod, it differs in the reed which takes place inside the foot of the rod. A reed reed consists of these parts: the "resonator", the upper part of the pipe that denotes the color and timbre of the sound produced; walnut, a cast of tin (usually cylindrical in shape) with a longitudinal hole which is welded to the lower end of the resonator. the canaletto, which is the support of the reed inserted and welded inside the walnut, its dimensions, equal to those of the reed, determine the pitch of the sound, or the note produced; the brass reed, which is blocked on the canal by a wooden wedge, its curvature affects the readiness of the reed, the thickness on the color and the dimensions on the note to be produced. This, beating on the channel in the presence of air, causes the sound; the tuner, a metal hanger that crosses the walnut and locks the reed on a variable length. This allows you to vibrate larger or smaller portions of the reed, thus changing its tonality. The hanger comes out to allow the organ builder to tune the pipe without taking it apart; the foot, similar to the foot of a core rod but more resistant, which locks e

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