These will do nicely. Now I must make a scale beam and a post.

“这些很不错。现在我要做一个砣。

Herbert worked away until he had made the beam and the post.

赫伯特一直在弄，直到把刻度做好。

We must put four threads to each cup; then we will tie the threads to the ends of the beam.

我们必须在每个杯子上穿四根线，然后把线系到的尾端。”

Next, he put the beam into a little groove at the top of the post, so that it would balance nicely.

再把插到顶端的一个小槽里。这样就能让它保持很好的平衡。