为使学生更为直观而有效地学习机械波知识 ,笔者经不断摸索、改进 ,自制了横波和纵波演示仪 .实践证明 ,该演示仪制作、操作简单 ,效果明显 .现将该演示仪介绍如下 :一、设计思想演示机械横波 ,可以用一曲面模具的移动来带动一些活动的杆 ,这些杆的依次振动就表现为波的移动 , In order to enable students to learn mechanical wave knowledge more intuitively and effectively, the author has continuously explored and improved the self-produced shear wave and P-wave demonstrator. Practice has proved that the demonstrator is simple to produce, simple to operate, and effective. The present demonstrator is introduced as follows: First, the design idea demonstrates the mechanical shear wave, which can be used to drive some moving rods with the movement of a curved mold. The sequential vibration of these rods shows the wave motion.