Measuring time of motion using photogates is a good solution when the moving object has plane surfaces or when you can put upon it a plane surface object, which acts as a beam stopper. There are however situations where other devices, and in particular micro-switches, although they are much cheaper than photogates, perform at least as well as photogates. In this frontline, I describe how we can construct an inclined plane equipped with micro-switches and how we can use it in experiments involving rolling cylinders.

中文翻译：

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一种便宜而准确的测量汽缸滚动时间的技术

当移动物体具有平面或您可以在其上放置平面物体（用作防束塞）时，使用光电门测量运动时间是一个很好的解决方案。但是，在某些情况下，其他设备，尤其是微型开关，尽管比光电门便宜得多，但其性能至少与光电门一样好。在这一前沿，我描述了如何构造一个配备有微动开关的倾斜平面，以及如何在涉及滚动油缸的实验中使用它。