电磁打点计时器打点过程是：纸带上方置圆形复写纸和圆形蜡纸，打点针打击蜡纸，经复写纸把针点痕迹留在纸带上。纸条平动时，通过它与复写纸间的摩擦拖动复写纸与蜡纸转动，圆形蜡纸与复写纸边线处轮流被打击。实验的结果常常出现复写纸与蜡纸不转动，打出的点不清晰，甚至无 The magnetic dot counter is used for dot punching: round paper and circular wax paper are placed on the tape, and the hitting needle strikes the wax paper, and the trace of the needle is left on the paper tape by the carbon paper. When the paper strip moves, it drags the carbon paper and the wax paper through the friction between it and the copy paper, and the circular wax paper and the copy paper edge are alternately blown. The result of the experiment often appears that carbon paper and wax paper do not rotate and the dots are not clear or even