The author builds up a mechanical model, in which the motion is portrayed when electric charges get into even strength of electric fields and magnetic fields which are perpendicular to each other.

• 摘要研究以不同初速度进人互相垂直的匀强磁场和均强电场中的带电粒子束的运动情形，幷同相似的力学运动相比拟，建立了直观的力学模型。