Using table tennis or plastic bottle as the armature, a device that can demonstrate the phenomenon of point discharge is deigned. This paper details making and demonstration procedure.

• 摘要把用乒乓球、塑料瓶等做成的电枢放在放电尖端附近，电枢在“电风”的驱动下可快速转动。介绍了该实验装置的制作过程与演示方法。