Reed

“A pipe of this nature fitted with a piece of glass so as to exhibit the reed (which is a “free reed") is shown in [the illustration]. Q is the wind-chest of the bellows, into which P is fitted. In the right-hand figure the upper part of the pope is removed, so as to show the reed more clearly. A plate of metal c c, has a slit but in it, in which the tongue I may just past. By means of a curved wire, r, projecting above the top of the pipe, and the play of the tongue may be controlled and the pipe tuned. The conical pipe, H, placed at the top, serves to increase the power of the sound". -Benson, 1891

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