Revolving Bell Engine

   This was a popular piece of apparatus! I have seen three examples by Davis and one by another maker (the Wittenberg example at the left) in the fifty odd collections I have examined. The instrument is an inverted revolving electromagnet, with a gearing system added to strike the bell every hundred revolutions. The gearing also acted to keep down the rotation speed of the engine.
           Wittenberg University                   Washington and Lee University          Smithsonian Institution                      Middlebury College

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