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Automatische Übersetzung:
Fontaine's safety cage for mine shafts. If the rope or chain suspending the cage broke a spring was released and levers were thrust into the guide rods, so stopping the cage from plunging to the bottom of the shaft. From "Underground Life; or, Mines and Miners" by Louis Simonin (London, 1869). Wood engraving. (Photo by: Universal History Archive/UIG via Getty Images)