| 摘要 |
PURPOSE: A playing device having various sounds is provided to teach children sound property and a course that the sound is delivered to an ear. CONSTITUTION: A lower part of a resonance body(10) is picked up by a thumb and an index finger and covered with a palm. Using a middle finger, a ring finger and the thumb, a space is formed between a trembling plate(20) and fingers and then the fingers are closed. When an operating string(40) is pulled downward, a tightening piece(30) and the trembling plate are vibrated at high speed with friction caused by the contact of fingers and the operating string. The trembling plate generates vibration having various periods and sound wave is generated according to the period change caused by interference between the vibrations.
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