其方法代替了传统的手工测量，而且易于机器自动反馈控制玻璃棒的直径变化。
The method not only can substitute traditional manual measurement, but also can control the change of the diameter by machine conveniently.
反馈是系统实现其自动控制的一种方式和手段。
Feedback is a method that a system realizes its self control.
介绍了一种落球式粘度计，具有结构简单、实用的优点，可以应用于需要对粘度进行反馈控制的自动化装置。
A simple and practical falling-ball viscometer, which can be applied into the automatic instrument with the need of viscosity control are introduced.
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