1、The process is very simple. First, a photographic plate is coated with a light sensitive material.
這個過程非常簡單，首先，把照相底片用感光材料包裹起來。

2、a photographic plate measuring 3-1/4 by 4-1/4 inches
一種常用的大小為×英寸的感光板。

3、Some distance above the lead block a photographic plate is placed.
在鉛塊上方某一距離處放一照相底板。

4、A photographic plate or a piece of film so exposed.
感光膠片或底片的曝光的行為。

5、First, a photographic plate is coated with a light-sensitive material.
首先，把一個照相底片覆蓋上感光材料。

photographic plate翻譯