ersion would render a portion of the surface ofeach paddle-board mechanically useless. In the position a, the wholeforce of the paddle-board is efficient for propelling the vessel; but as thepaddle enters the water in the position h, its action upon the water notbeing horizontal, is only partially… … by its re-action producing a certain propelling effect. The tendency, how -•ever, of the paddle entering the water at h is to form a hollow or trough,which the water, by its ordinary property, has a continual tendency to fillup. After passing the lowest point A, as the paddle approaches the…
Steam-engines · Steam-navigation · Locomotives
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