Some distance above the lead block a photographic plate is placed.

在铅块上方某一距离处放一照相底板。

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First, a photographic plate is coated with a light-sensitive material.

首先，把一个照相底片覆盖上感光材料。

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And we record here. And this is the blowup of what is on that photographic plate.

我们在这里记录，这是感光片所拥有的东西的放大形式。

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And then further you put some recording device, which in those days was a photographic plate, far across a room. So you take a tiny, tiny angle and you go far enough across the room.

接着放一些记录设备，那时用的是一个摄影用的感光片，取一个极小极小的角度,然后去到房间中足够远的地方。

麻省理工公开课 - 固态化学导论课程节选

And this was painstaking work. What you have here is the photographic plate demonstrating a spread.

这是门,细致的工作。

麻省理工公开课 - 固态化学导论课程节选

And we record here. And this is the blowup of what is on that photographic plate.

我们在这里记录,这是感光片所拥有的东西的放大形式。

麻省理工公开课 - 固态化学导论课程节选

Use a photographic plate to record an image from a zenith-pointing telescope, and you will end up with a streaky image, as a result of the earth's rotation.

ECONOMIST: Mirror, mirror