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Double Oscillating Steam Engine
Photograph - Photograph
An illustration of a double oscillating steam engine, created by Elisha Graves Otis (1811-1861) as a "power plant" exclusively for elevators. Otis, an American, invented a safety device that prevented elevators from falling if the hoisting cable broke.
March 6th, 2013
Viewed 36 Times - Last Visitor from San Francisco, CA on 10/05/2014 at 6:14 PM
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