Chap. XIV.

OX PILES AXD PILE-DRIVING.

10R5

right angles to each other, and are worked by the connecting rods II, attached to the pistonrods, which are furnished with slide parallels. The slide valves of the piston are workedby the eccentric V on the end of the shaft P.

The steam is supplied by the pipe S from the boiler T, which receives its water from thecistern M by means of the pump W worked by the eccentric rod X fixed on the spurnave at Y, by the handle at Z. The supply of steam is regulated by the handle a acting ona valve in the steam pipe S.

The drum L consists of a fixed and loose cylinder, the latter revolving by the friction ofthe former, and is brought into or out of contact by the hand lever Y, which has a fulcrumattached to the standard.

The follower/is furnished with a pair of clippers, which takes hold of a staple fixed inthe ram, and carries it to the top of the frame ; and when the top of the tongs or clippersare pressed closer together by coming between the contracted cheeks e, e, the lower partopens and allows the ram to fall.

SI BAM riLB-DRIVING MACniNB.

For drawing a pile, chain tackle is secured to the pile and passed over the top pulley tothe drum L, and is then drawn by the drum of the apparatus turning round.

The saw apparatus has a saw 4 feet in diameter, which has teeth 3 inches apart, securedto the beam c, which works on the upright shaft d for a centre, and slides laterally on theiron arc e ; when used the saw is adjusted to its proper height by the screw/, and a barhaving a hook in one end, and fitting into a staple in the beam's end, is u^ed to press thesaw against the work ; the bevel pinion g being raised into gear by the foot lever h, motion