The Civil engineer and architect's journal, scientific and railway gazette . be driven. Mr. Harrison, the engineer, also certifies that theAtmospheric Pile-Driver gave him entire satisfaction. This machine consists of a vacuum cylinder of wrought-iron(A), closed at the bottom and open at the top, having an air-tightpiston, and self-acting slide-gear, fixed to any convenient part ofthe frame of a common pile-engine. The piston-rod is connectedto a chain which passes over a fixed pulley (B) on the top of theengine; to the end of this chain is suspended a pulley (C) ; overthis passes a second cha
The Civil engineer and architect's journal, scientific and railway gazette . be driven. Mr. Harrison, the engineer, also certifies that theAtmospheric Pile-Driver gave him entire satisfaction. This machine consists of a vacuum cylinder of wrought-iron(A), closed at the bottom and open at the top, having an air-tightpiston, and self-acting slide-gear, fixed to any convenient part ofthe frame of a common pile-engine. The piston-rod is connectedto a chain which passes over a fixed pulley (B) on the top of theengine; to the end of this chain is suspended a pulley (C) ; overthis passes a second chain, one end of which is attached to theram, and the other, passing down under the bottom of the frame,is brought up and affixed to the head of the pile. The power isderived from a small steam-engine, fixed at any convenient spot,which works an air-pump for producing the exhaustion. Com-munication is made between the air-pump and the Pile-drivingMachine by small wrought-iron tubes, connected together by flexi-ble joints of vulcanised india-rubbw. Thus the machine possesses. Front Elevation of a Double Machine. the inciilculable advantage of being worhed at any required distancefrom the steam-engine, and moved about with as much facility as acommon crab-engine. The mode of action is as follows : the rambeing supposed down on the pile-head, and the piston consequentlyat the top of the vacuum cylinder, communication is opened bythe valve gear with the air-pump, exhaustion then takes place inthe cylinder, the piston descends by the external pressure of theatmosphere, and raises the ram; when the piston arrives at thebottom of the cylinder, the valves reverse themselves, communica-tion with the air-pump is then shut off, and the external air ad-mitted under the piston ; equilibrium being now restored, the ramfalls with the full effect of gravity on the pile; the valves areagain reversed, and the same operation is repeated. Thus a suc-cession of short heavy blows is given, rapid of^co
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Keywords: ., boo, bookcentury1800, booksubjectarchitecture, booksubjectscience
