Part 10

FLUES of iron, lap-welded, with copper ferrules on fire-box ends; or of seamless drawn copper or brass.

FIRE-BOX of best homogeneous cast-steel; side- and back-sheets five-sixteenths inch thick; crown-sheet three-eighths inch thick; flue-sheet one-half inch thick. Water space three inches sides and back, four inches front. Stay bolts seven-eighths inch diameter, screwed and riveted to sheets, and not over four and one-half inches from centre to centre. Crown bars made of two pieces of wrought-iron four and one-half inches by five-eighths inch, set one and one-half inches above crown, bearing on side-sheets, placed not over four and one-half inches from centre to centre, and secured by bolts fitted to taper hole in crown-sheet, with head on under side of bolt, and nut on top bearing on crown bars. Crown stayed by braces to dome and outside shell of boiler. Fire-door opening formed by flanging and riveting together the inner and outer sheets. Blow-off cock in back or side of furnace operated from the footboard.

GRATES of cast-iron, plain or rocking, for wood and soft coal; and of water tubes, for hard coal.

ASH-PAN, with double dampers, operated from the footboard, for wood and soft coal; and with hopper with slide in bottom, for hard coal.

SMOKE-STACK of approved pattern suitable for the fuel.

CYLINDERS.

Placed horizontally; each cylinder cast in one piece with half-saddle; right and left hand cylinders reversible and interchangeable; accurately planed, fitted and bolted together in the most approved manner. Oil valves to cylinders placed in cab and connected to steam-chests by pipes running under jacket. Pipes proved to two hundred pounds pressure.

PISTONS.

Heads and followers of cast-iron, fitted with two brass rings babbited. Piston-rods of cold-rolled iron, fitted and keyed to pistons and crossheads.

GUIDES.

Of steel, or iron case-hardened, fitted to guide-yoke extending across, or secured to boiler and frames.

VALVE MOTION.

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.

All principal parts of engine accurately fitted to gauges and thoroughly interchangeable. All movable bolts and nuts and all wearing surfaces made of steel or iron case-hardened. All wearing brasses made of ingot copper and tin, alloyed in the proportion of seven parts of the former to one of the latter. All bolts and threads to U. S. standard.

TENDER.

On two four-wheeled trucks. Wheels of best plate pattern, thirty inches in diameter. Truck frames of square wrought-iron with equalizers between springs, or of bar-iron with wooden bolsters. Axles of best hammered iron. Oil-tight boxes with brass bearings. Tank put together with angle iron corners and strongly braced. Top and bottom plates of No. 6 iron; side plates of No. 8 iron. Tender frame of wood or iron.

PAINTING.

Engine and tender to be well painted and varnished.

[Transcriber's notes: Obvious printer's errors have been corrected, all other inconsistencies are as in the original. The author's spelling has been maintained.

V[] is used to mark square roots; e.g.: V[6 + 1] means the square root of 6 + 1.]