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现行高中物理课本中所叙述的演示简谐振动图象的“沙摆”装置,需要配有支架和底板,所用的沙子需是过筛干燥后的细沙,否则它会造成堵塞流口或流出不畅的现象而影响图象的质量。
The “sand pendulum” device used to demonstrate the harmonic vibration image in the current high school physics textbook needs to be equipped with a support and a floor. The sand used must be sieved and dried fine sand, otherwise it will cause the flow mouth to be blocked or flow out. Bad phenomena affect the quality of the image.