To determine the catenary curves of arches, he would tack a sketch of a foundation plan on the ceiling, hang loops of string, and attach weights along the loops in proportion to down forces.
为了确定拱顶的链状曲线，他会用大头针将基座草稿钉到天花板上，吊上几圈绳子，在绳子上加重，与向下的力相符。
Here is this rod — it doesn't have to be horizontal - as this one — and I hang on this side of the rod, I hang with a string a very massive object.
这是柱子-，不用和这个，处于同一水平线上-，我握住柱子的这端，在绳上挂很重的物体。
We put in here a tension meter, we put in here a tension meter and the bottom one, we hang on a string with a tension meter and then here we put four kilograms.
这儿放个张力计，这里也要一个，底下也有，一个张力计，挂着4kg物体。
But hang on, why have you stuck all these pieces of string onto the book?
但是等一下！你为什么把这些线粘在书里面？
But hang on, why have you stuck all these pieces of string onto the book?
但是等一下！你为什么把这些线粘在书里面？
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