. 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 .. . In each figure let a represent the induction-pipe, orthat by which the steam enters from the boiler; b theeduction-pipe, or that which conducts to the chimney; andc and d the passages to the bottom and top of the cylinderrespectively. During the upward stroke of the piston,the cock, which is a round plug having two passagesbored through it, is in the position of fig. 1, where a com-municates with c; and d with b ; as we
. 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 .. . In each figure let a represent the induction-pipe, orthat by which the steam enters from the boiler; b theeduction-pipe, or that which conducts to the chimney; andc and d the passages to the bottom and top of the cylinderrespectively. During the upward stroke of the piston,the cock, which is a round plug having two passagesbored through it, is in the position of fig. 1, where a com-municates with c; and d with b ; as we have just de-scribed ; but, during the down stroke, the cock is placed LOW-PRESSURE STEAM-ENGINE. 285 in the position shown in fig. 2, and a reverse actionensues. It will readily be seen, by an inspection of thefigures, that the cock or plug has only to be moved roundone quarter, that is through an arc of 90° , to effect thisgreat change ; and this motion can easily be imparted toit by means of a bent lever connected with the piston-rod, or with the working-beam of the engine. III. In the engine just described high-pressure steamonly can be employed; because it has to
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Keywords: ., bookcentury1800, bookdecade18, booksubjectrailroads, bookyear1839
