来自《耶鲁大学开放课程：新生有机化学 第4集 第4集》

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  and the Diameter of the sphere
  这个双凸物镜球体的
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  on which the double convex Object-glass was ground was about 102 Feet;
  直径约为102英尺
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  hence I gathered the thickness of the Air
  因此我得到这个玻璃环的
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  or Aereal Interval of the Glasses in that Ring."
  空气间隙或间隔厚度
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  So in other words, here's the air gap he's trying to measure,
  换句话说 这就是他所尝试测量的
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  which is the sixth ring out. He knows the diameter of that ring.
  第六环的空气间隙 他知道环的直径
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  He knows that they touch in the middle, the two glasses,
  知道这两片玻璃中心相叠
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  and he knows that it's a sphere
  他也知道这是一半径为
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  and it has a radius of fifty-one feet.
  五十一英寸的球体
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  So he can just use trigonometry to figure out that the air gap,
  因此他可以使用三角学计算出间隙厚度
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  if he knows that angle there,
  如果他知道那里的角度
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  the air gap is 1.8 microns, right?
  空气间隙是1.8微米 对吗