. Appleton's dictionary of machines, mechanics, engine-work, and engineering. ojecting slips of iron e e, bolted to thefront of the upright throughout its entire length. The lower end of the pile-case is open, to admit thehead of the pile, and is furnished with cast-iron jaws or resting-pieces//, (see Figs. 3042 and 3044,)bolted to its interior surfaces; these are so formed as to rest upon the shoulders of the pile H, which,if we suppose the great chain-barrel to be left free to revolve, thus becomes the sole support for theweight of the whole mass of the driving apparatus. By these arrangemen
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. ojecting slips of iron e e, bolted to thefront of the upright throughout its entire length. The lower end of the pile-case is open, to admit thehead of the pile, and is furnished with cast-iron jaws or resting-pieces//, (see Figs. 3042 and 3044,)bolted to its interior surfaces; these are so formed as to rest upon the shoulders of the pile H, which,if we suppose the great chain-barrel to be left free to revolve, thus becomes the sole support for theweight of the whole mass of the driving apparatus. By these arrangements it will be seen that as thepile is, by successive steps, forced into the ground by the action of the hammer, (the chain-barrel beingthrown out of geer with its driving apparatus during the process,) the pile-case with all its appendages,weighing about three tons, is left at perfect liberty to bear upon the shoulders of the pile, and followdown along with it, while at the same time, and by the same means, the pile itself is guided into astrictly vertical and true I I The driving apparatus consists simply of a modification of his steam-hammer, the action of the vari-ous parts being in all respects identical, though the whole is movable, as above described, instead ofbeing fixed. The steam necessary for its supply is generated in a boiler I, the construction of which isvery similar to that of the ordinary locomotive engine boiler. The steam-chest J surmounts the firebox, and is made of sufficient height to prevent the influx of water into the steam-pipes, and the em ireboiler and steam-chest are covered externally with a coating of felt, and with strips of wood to preventthe radiation of heat, and to give greater symmetry of appearance. On the cover of (lie steam chest(the internal construction of which is fully shown in Fig. 303.)) is east a small square box <j. containingsuitable bearings for the safety-valve, which is loaded by a weight and combination of levers
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
