因为没有大炮，他们只得在城堡上装设假炮。
Being destitute of cannon, they mounted Quaker guns in the fort.
假炮的概念最终被放弃，但指挥仪仍然存在。
The dummy gun idea was eventually given up, but the director remains.
假炮的动作被传递到炮位上，各炮位跟随假炮动作的读数转动仰角及方向，在后来的装备上更交给自动控制设备去完成。
The movements which positioned the dummy gun were transmitted to the mounts, to be followed in elevation and train by matching Pointers or, in later installations, by automatic control equipments.
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