【英语时差8,16】如何得知地球在24小时之类自转一周的呢？-下
时间：2019-02-15 作者：英语课 分类：英语时差8，16
If you drop the ball, gravity will pull it toward the center of the earth, but will not diminish that extra eastward 1 speed. So as the ball falls it’ll outrun the ground and land slightly east of the straight-down point. Edwin H. Hall, a Harvard University physicist 2, looked for this effect in 1902. Working in an enclosed tower, he dropped one-inch bronze balls from a height of 75 feet into a pan of tallow. Hall was careful. He built a mechanism 3 to release the ball without jiggle or spin, and a cloth tube to protect the path of fall from breezes. He used high-precision surveying telescopes to measure the position of a plumb 4 line before each drop, and the position of the ball afterward 5. He made a total of 948 drops. The Result? The average eastward deflection was just as predicted by Newton’s laws for a 75-foot tower at the latitude 6 of Cambridge, Massachusetts: about one-seventeenth of an inch.
- The river here tends eastward.这条河从这里向东流。
- The crowd is heading eastward,believing that they can find gold there.人群正在向东移去，他们认为在那里可以找到黄金。
- He is a physicist of the first rank.他是一流的物理学家。
- The successful physicist never puts on airs.这位卓有成就的物理学家从不摆架子。
- The bones and muscles are parts of the mechanism of the body.骨骼和肌肉是人体的组成部件。
- The mechanism of the machine is very complicated.这台机器的结构是非常复杂的。
- No one could plumb the mystery.没人能看破这秘密。
- It was unprofitable to plumb that sort of thing.这种事弄个水落石出没有什么好处。
- Let's go to the theatre first and eat afterward. 让我们先去看戏，然后吃饭。
- Afterward,the boy became a very famous artist.后来，这男孩成为一个很有名的艺术家。