588

MODERN STEAM PRACTICE.

suspended from the bottom with two side rods. Instead of thevalve rod being guided with a V or square piece in a line with therod, the sliding block is fitted to a rod, oscillating on a pin closeup to the gland, and suspended with the vertical oscillating links,liung from brackets attached to the body of the boiler.

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Fig. 444.—Eccentric and Rods.

A, Eccentric. b b, Pins and cotters. c, Set screw. d, Strap. e e, Smigs and bolts.f, Oil cup. c, Rod

In some arrangements (Fig. 445) the Straps and rods are forged inone piece, working on cast-iron eccentrics in this example; the pumpis worked from a pin on the back-going eccentric rod, having a bentrod for Clearing the axle of the driving wheels, an arrangement notat all to be desired, although by this means a longer rod is obtained,which tends to lessen the thrust on the plunger gland. The link isarranged with lugs forged on for taking the eccentric rods, and thelink is suspended between the two, with side links oscillating on pinsforged on a piece bolted to the link. All the joints are providedwith oil cups forged on as shown. The sliding block for the linkis fitted as in the previous example to a rod, oscillating on a pinpassing through a crosshead, fitted to the valve rod; the rod beingsupported by a jointed link hung from a plate bolted between themain frames.

In all the preceding arrangements the links are of the lifting