“巴黎的音叉”a(小提琴和中提琴的A弦)在一秒钟内双的振动是435次,单的振动是870次。双的振动是按来回双侧振动计算的,在法国是按着单侧振动计算的。如:用眼睛看一下指板,当弓在弦上运行时,D和G比A和E的振动要慢。但这不是规律,这个规律可以用一种叫做“谢列耐”的圆板(材料随便)更清楚地看出。圆板可以通过轴心旋转,圆板内画有一些在圈圈上距离相同的洞。按照这样的次序,最内部的圈有40个孔洞,第二圈50个,第三圈60个,最外面圈80个孔洞。当圆盘转动起来,有气流通过,我们可 “Paris tuning fork” a (violin and viola A string) double vibration in a second is 435 times, a single vibration is 870 times. The double vibration is calculated as bilateral vibration back and forth, calculated in France as unilateral vibration. Take a look at the fingerboard with your eyes. When the bow is running on a chord, D and G vibrate more slowly than A and E. But this is not a law, and the law can be seen more clearly by a circular plate called Serenex (random material). The circular plate can rotate through the axis, the circular plate painted with some holes in the circle at the same distance. In this order, the innermost ring has 40 holes, the second ring 50, the third ring 60, and the outermost ring 80 holes. When the disc turns, there is a flow of air, we can