临换极和新极相比，电阻约下降一半，在电流相等的条件下，阳极压降下降一半。
Becoming changed anode was contrasted with new one, anodic resistance fell around by half, if electric current was equal, anodic voltage-drop fell by half.
L1照射到两个光敏电阻上的光强度应该相等，有一个简便的方法可以实现这个要求，将两个光敏电阻固定在同一个铝块上的两个小孔内，灯泡则固定在两个光敏电阻的中间。
The photoconductive cells should receive equal illumination from L1, a convenient method is to mount the cells in holes in an aluminum block and to mount the lamp midway between them.
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