| 摘要 |
Wind instrument of the type with mouthpiece, single reed, double reed, lip, etc. . . , comprising a device for laterally perturbing the column of air, adapted to modify the volume of a given section of the column of air, and constituted by a piston slidable inside a body disposed laterally with respect to the column of air and issuing therein, the end of the piston which faces the column of air being displaceable due to a threaded assembly inside the body and being able to project out of said body by encroaching on the said column of air. |
