Farrow's military encyclopedia : a dictionary of military knowledge . ecessary to accommodate the width of the hammer,and afford an opportunity for connecting the flexi-ble pipe which conveys steam from the boiler to op-erate the hammer. The hammer being hoisted toa rest at a convenient height, the pile to be driven isplaced in position and the hammer lowered until thebonnet casting, which forms the bottom of the frame,receives the head in the conical aperture throughwhich the pintle-like projection on the bottom faceof the hammer strikes, when a blow is weight of the hammer bein
Farrow's military encyclopedia : a dictionary of military knowledge . ecessary to accommodate the width of the hammer,and afford an opportunity for connecting the flexi-ble pipe which conveys steam from the boiler to op-erate the hammer. The hammer being hoisted toa rest at a convenient height, the pile to be driven isplaced in position and the hammer lowered until thebonnet casting, which forms the bottom of the frame,receives the head in the conical aperture throughwhich the pintle-like projection on the bottom faceof the hammer strikes, when a blow is weight of the hammer being on the pile, theclutch on the winding drum or other device ccmtrol-ling its descent, is cast adrift and the valve thrownopen to admit the passage of steam through the flex-ible pipe and the hollow piston rod suttieieut to op-erate the hammer at any desired speed. On the admission of steam the hammer immedi-ately rises in its frame or cage, to the full ofthe stroke at which it maybe set,ordinarilj-about fourinches, and on reaching the end of its stroke the. ?when the diameters do not exceed eighteen or twentyinches. When it is desired to drive piles of a greaterdiameter the heails are roughly chamfered with achopping axe. It is an exceedingly difficult matterto compare the work done by this simple machinewith that of the ordinary drop-hammer, because thia PELETUS. 524 PILING. steam-hammer will so readily do ! work that the or-dinary drop-hammer will not do at all, for instance,after a pile has been driven with an ordinary drophammer until it has become necessary to removethe ring and cut a section off the pile to form a newand solid head,by experiment it has been found thatthe steam-hammer experiences no difficulty in forc-ing the pile imtil the point reaches hard pan or rock,and it will, perhaps, be sutlicient to state tbat in tbemachine here illustrated,the ram weighing 5,500 lbs.,when working under a pressure of 75 lbs. of steamdelivers upwards of 100 blows per minu
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Keywords: ., bookcentury1800, bookdecade188, booksubjectmilitaryartandscience
