The Maritime History of the Great Lakes
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The First Generation of Marine Engines in Central Canadian Steamers, 1809-1837 
Web site/pageNewspapersText  Apr 1997  ... of the problems with the massive low pressure cylinders stemmed from the common assumption that they needed to be kept vertical. Lay the apparatus on its side, founders reasoned, and the heavy piston would steadily wear away the lower wall of the cylinder until a vacuum could not be produced--no vacuum, no motion...
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