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A reed pipe comprises a metal tongue (the reed) which rests against a shallot, in which is carved a tunnel. The reed and shallot are held in place by a wooden wedge. This assembly protrudes from the underside of the block and hangs down into the boot. A tuning wire is inserted through the boot and is bent to hold the reed against the shallot.
In a rank of stopped pipes, the lowest pipe is 4 feet in length but sounds at unison pitch—that is, at the same pitch as an 8 ′ open pipe—so it is known as an 8 ′ stop. Reed pipes are also labeled the same as that of an open pipe with the same pitch, regardless of the actual length of the pipe.
The sound of an organ pipe is made up of a set of harmonics formed by acoustic resonance, with wavelengths that are fractions of the length of the pipe.There are nodes of stationary air, and antinodes of moving air, two of which will be the two ends of an open-ended organ-pipe (the mouth, and the open end at the top). [1]
Reed A reed stop at 8 ft pitch on the manuals with a tone similar to that of a bassoon. Dulciana Dulziana String An 8 ft pitch metal string stop. Usually the softest stop on an organ. Fagotto (Italian) Fagot (Dutch) Fagott (German) Bassoon (English) Basson (French) Reed: A 16 ft or 8 ft pitch chorus reed.
Ophicleide (/ ˈ ɒ f ɪ k l aɪ d / OFF-ih-klyde) and Contra Ophicleide are powerful pipe organ reed pipes used as organ stops. The name comes from the early brass instrument, the ophicleide, forerunner of the euphonium. The Ophicleide is generally at 16 ft pitch, and the Contra Ophicleide at 32 ft.
On a slotted metal pipe, some or all of the metal cut out to make the slot is rolled up so the slot can effectively be shortened or lengthened, thus changing the pitch of the pipe. On a slotted wooden pipe, a wooden slider is provided to shorten or lengthen the slot. A stopped pipe (wood or metal) is usually tuned by moving its stopper up or down.
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A reed rank inside an accordion is a single full set of the reeds that are the means to achieve the instrument's sound range. These reed ranks are located in the reed chamber. Most accordions to this date typically have between two and four reed ranks on the treble side and between three and five reed ranks on the bass side.