Well, it could be useful for this too:
https://en.wikipedia.org/wiki/Conqueror_(tank) :
Quote:
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One feature of particular note was the rotating commander's cupola, which was at the heart of the Conqueror's fire control system and was advanced for its time. The commander could align the cupola on a target independently of the turret, measure the range with a coincidence rangefinder, and then direct the gunner on to the new lay mechanically indicated to him by the cupola. In theory, when the gunner traversed to the new lay, he would find the target already under his sights, ready to be engaged. Meanwhile, the commander was free to search for the next target.
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By the way, I've added a download link, so you can study the thing in details and watch a cool animation inside S3D...