Perpendicular Canal Lift. Cranes hoisted a tub boat, the weight of which was counterbalanced by tub of water in shaft parallel to path of boat. Semaphore signal indicated status of boat. Not found practicable. From A Treatise on the Improvement of Canal Navigation by Robert Fulton (London, 1796). Robert Fulton (1765-1815) American engineer. Engraving.
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