Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . er or farther apart. Pxle-drawer. (Ilifdrau/ic Engineering.) AVhennot too tinnly imbedded, piles may be drawn bymeans of a simple lever. A screw set in a strongframing and turned by a windlass or crab mav alsobe employed. Still greater power may be attainedby the employment of the hydrostatic press. In tide-waters, a barge or scow can be made fast to the headof
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . er or farther apart. Pxle-drawer. (Ilifdrau/ic Engineering.) AVhennot too tinnly imbedded, piles may be drawn bymeans of a simple lever. A screw set in a strongframing and turned by a windlass or crab mav alsobe employed. Still greater power may be attainedby the employment of the hydrostatic press. In tide-waters, a barge or scow can be made fast to the headof the pile at low water ; this is a very effectual modeif the boat have sufficient elevating capacity. Ineither case, the attachment must be very is sometimes effected by boring a hole throughthe head of the pile and inserting an iron pin, project-ing oil either side ; over the ends of this are i)assediron rings or loops made fast to the lifting rope orchain. When the whole of the pile is below water,so that it is not accessible for this purpose, an ellip-ti.:al iron collar is slipped over the head of the pile,and is caused to bind by hauling on the rope, theangles of its upper and lower edges bearing againstthe Pile-driver. (Hydraulic Engineering.) A ma-chine having a rising and falling weight to drive apile into its bed. It is suggested that the^siwra whereby Csesar drove the pileeof his bridge over the Rhine must have been something similarto our machine, in which a weight is alternately lift- Fig. 3717- edand dropped on the headof the pile. Fig 3717 is a view of aBtenm piie-driver, in whichthe monkfy is raifed by asteam-hoist and automati-cally detached on reachingits hight. A priir of nip-pers, as seen at B, engagesthe hook on the top of theweight, and is kept in aclosed i)osition by the handles of the nip-pers reach the slot in thebar above, they are pressedtogether, releasing the jawsfrom the hook of the weightand allowing it to drop outhe hea
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