| 摘要 |
FIELD: physics. ^ SUBSTANCE: drum includes a hollow crimp cylindrical resonator case fixed on a stand, with one of the supporting shell rings is movable. The shell ring has orifices for air circulation, is spring-loaded and connected by a cable to a pedal. One end of the spring is attached to the upper part of the stand, and another end is attached to a ring. The ring moves freely along the stand and is connected to the movable shell ring. ^ EFFECT: extended functional capabilities of the article. ^ 2 dwg |
