At the beginning of the 1950's cartridge-making developed and automatic, remote-controlled machinery was introduced, meaning that the actual presence of personnel was no longer necessary. The cartridge-making machinery was loaded manually, after which the operators left the area and controlled operations from a distance. Operations were followed using a system of three mirrors which reflected the image of the machine so the operator could see it. The operator approached the machine only when the load was finished, to set up a new cycle.
You are looking through the first (a bit broken) mirror, to the roof; if you look carefully, you can distinguish the other two mirrors... the red alignment marks surrounded the machine.
During the Forties the whole perimeter of the factory had been electrically illuminated for security and surveillance purposes... big news, for those times.
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