圖-1: 宋朝共振盆。

圖-2: 摩擦把柄引起的共振可將水掀起。

圖-1是美國 3B-Scientific 公司製造給學生實驗專用的共振盆，盆上有兩個把柄，盆內刻有四隻魚口或魚尾的紋路。

共振盆最早出現在宋朝（960-1279年），其原理如下：

兩手分別在把柄上輕快地前後摩擦移動，使把柄發出聲波。此聲波會從四個象限的方向沿著盆子的週圍擴散，最後激起水花。這家公司所製作的共振盆可以使水花濺高到30公分，圖-2所看到就是水花濺起來的實況。

共振現象和控制是許多工程師和科學家研究的主題，顯然，設計此盆的宋朝人對共振有很深的認識。

Resonance Bowl

Dating from the Song Dynasty (960-1279 AD), this bronze basin has two prominent handles and four fish in relief on the bottom, as well as lines emanating from the mouths or tails of the fish. When the handles are rubbed briskly with the palms of the hands, a harmonious sound is heard and standing waves are excited in the four quadrants along the circumference, causing water columns to come alive, spouting more than 30 cm into the air, as if squirting from the fish.

Diameter: 380 mm     Height: 150 mm