The roads and railroads, vehicles, and modes of travelling, of ancient and modern countries; with accounts of bridges, tunnels, and canals, in various parts of the world .. (1839)
London : J.W. Parker · leaf 315
the fol-lowing figure represent a crank with its rod in differentparts of its revolution. AVhen the crank is at B, suppos-ing it to revolve in the direction indicated by the arrow,the rod is exerting its full force to pull it round; andwhen it is at the opposite point the rod will be acting on 302… … points c and d. called the dead points, at which, whenthe crank has arrived, it is carried past them simply byits momentum, for the rod has as much tendency to pullin one way as the other. When two cranks, therefore, areplaced on the same axle, they are set at right angles toeach other, so that the…
Roads · Railroads · Bridges · Vehicles
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