工匠们对玻璃进行试验，为了找到更好地折射光线的方法，在摆弄工艺的过程中发明出了显微镜和望远镜。
Microscopes and telescopes were invented by way of artistic tinkering, as craftsmen experimented with glass to better bend light.
介绍了离心铸造磨球的工艺，以及转速、内浇口断面积计算方法和影响工艺过程的因素。
The technology of grinding ball by centrifugal casting, the rotational speed, the method for calculation of ingate area and factors influencing technological process were introduced.
这种制造方法的特点是，制造工艺过程简单，投产快，生产周期短，成本低，经济效果好。
The features of this manufacturing method are simple machining process, fast commissioning, short productive cycle, low cast and good economical benefit.
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