Most approved shifting link motion, graduated to cut off equally at all points of the stroke. Links made of the best hammered iron well case-hardened. Sliding block four and one-half inches long, with flanges seven inches long. Rock shafts of wrought-iron. Reverse shaft of wrought-iron, made with arms forged on. THROTTLE-VALVE. Balanced poppet throttle-valve of cast-iron, with double seats in vertical arm of dry-pipe. DRIVING-WHEELS. CENTRES of cast-iron, with hollow spokes and rims. TIRES of cast-steel, shrunk on wheel-centres. Flanged tires five and one-half inches wide and two and three-eighths inches thick when finished. Plain tires six inches wide and two and three-eighths inches thick when finished. AXLES of hammered iron. WRIST-PINS of cast-steel, or iron case-hardened. SPRINGS of best quality of cast-steel. CONNECTING-RODS of best hammered iron, furnished with all necessary straps, keys, and brasses, well fitted and finished. EQUALIZING BEAMS of most approved arrangement, with steel bearings. Driving-boxes of cast-iron with brass bearings babbited. FRAMES. Of hammered iron, forged solid, or with pedestals separate and bolted and keyed to place. Pedestals cased with cast-iron gibs and wedges to prevent wear by boxes. Braces bolted between pedestals, or welded in. FEED WATER. Supplied by one injector and one pump, or two brass pumps, with valves and cages of best hard metal accurately fitted. Plunger of hollow iron. Cock in feed-pipe regulated from footboard. ENGINE TRUCK. SQUARE wrought-iron frame, with centre-bearing swing bolster. WHEELS of best spoke or plate pattern. AXLES of best hammered iron, with inside journals. SPRINGS of cast-steel, connected by equalizing beams. HOUSE. Of good pattern, substantially built of hard wood, fitted together with joint-bolts. Roof finished to carlines in strips of ash and walnut. Backboards with windows to raise and lower. PILOT. Of wood or iron. FURNITURE. Engine furnished with sand-box, alarm and signal bells, whistle, two safety-valves, steam and water gauges, heater and gauge cocks, oil-cans, etc. Also a complete set of tools, consisting of two jack-screws, pinch-bar, monkey, packing, and flat wrenches, hammer, chisels, etc. FINISH. Cylinders lagged with wood and cased with brass, or iron painted. Heads of cast-iron polished, or of cast-brass. Steam-chests with cast-iron tops; bodies cased with brass, or iron painted. Domes lagged with wood, with brass or iron casing on bodies, and cast-iron top and bottom rings. Boiler lagged with wood and jacketed with Russia iron secured by brass bands polished. GENERAL FEATURES OF CONSTRUCTION.