General Plan and Dimensions.
Outside connections; four five feet driving wheels with best Ames’s tire, all tires being flanged; level cylinders 15 inches diameter of bore and 20 inch stroke. Centre-bearing truck, with inside and outside bearings, and Lightener boxes. Square wrought iron frame well braced, 4–30 inch Whitney and Sons’ cast-iron truck wheels, spread 60 inches centre to centre. Lifting link motion working through rockers, valves described hereafter. Truck supplied with fore and aft safety chains, and safety beams beneath axles. Weight on drivers 30,000 lbs., on truck 10,000 lbs. Tender to be mounted on two trucks, each of 4–30 inch Whitney and Sons’ wheels, spread 54 inches from centre to centre. To have square iron frames well braced with outside Lightener boxes; tank to hold 1,600 gallons.
Detailed Specifications.
Boiler.—Grate 38 inches wide, 54 inches long, surface 20″ above rail, grate bars cast solid for 6 inches of the front end, to be 4 inches deep, and ¾ inch thick, placed ¾ inch apart in the clear; lower edges chamfered on each side by a chamfer of ½ inch deep and ¼ inch wide; centre of grate bars to be supported by a wrought iron bar 1 inch thick and 4 inches deep, attached as in drawing. Fire-box.—Outer sides of furnace shell 51 inches wide by 62 inches long; crown 8 feet above rail, to be made of ⅜ inch iron plates with a 16 inch necking of angle iron to carry the rear dome; corners to be joined by flanges rounded to a 4 inch radius. The crown of the shell to be raised 9 inches above the barrel crown, the connection being made by a sloping offset 20 inches long on top. End plates lap jointed to sides and top; the seams joining the fire-box to the waist, to be double riveted. Furnace to be made of ½ inch copper plates, ¾ inch at tubes, lap jointed, 42¼ inches wide, and 51½ inches long inside; side water spaces to be 3 inches clear at the bottom, widening (by sloping inwards the sides of the furnace) to 4 inches at the top of inner box; front spaces 4 inches, rear spaces 4 inches at bottom and 5 inches at top. Doorway made with a wrought iron ring fastened with ⅝ inch rivets, door of ⅜ inch plate with ¼ inch shield. Furnace joined to shell with ⅞ inch copper stay bolts, screwed and riveted at both ends, placed 44 inches from centre to centre. Eight roof-ribs laid widthwise of the crown of the furnace, being each 6 inches deep and ¾ inch thick, double welded at the ends and riveted at the centre, held down by T head bolts 5 inches between centres, bars to be raised above the crown sheet by ⅜ inch thimbles. Dome opening, neckling to be made of angle iron which shall be connected with the roof-ribs by 4–1⅛ inch stays, connected and placed as in the drawing. The back and tube sheets of the furnace are flanged over on top; the crown is flanged downwards on the sides, but not on the back and front. One dome is placed on the crown of fire-box shell 26 inches diameter and 24 inches high; opening of dome into boiler 16 inches diameter. Lower part of dome of wrought, top of cast-iron, put on with a ground joint. Furnace and shell to be connected at bottom by a wrought iron bar 3 inches wide, 2½ inches deep. The whole boiler to be thoroughly caulked inside and out. Barrel of ¼ inch best Philadelphia stamped charcoal iron, 44 inches diameter outside of main crown next the fire-box, and 43 inches next the smoke box end, 10 feet long with 3 inch angle irons at ends. Front dome of ½ inch plate worked in one piece, 23 inches diameter. End plates of boiler stayed with six 1 inch rods, cottered into blocks, riveted to plates; barrel plates riveted with ¾ inch rivets, and 1¾ inch pitch. Smoke box, 2′ 4″ long, same diameter as barrel, of 3
16 inch plates well riveted, bolted to the angle iron so as to be easily removed for inside repairs; front tube sheet 6
8 inch. Tubes, 140 two inch (outside) diameter No. 9 thickness at fire end, No. 14 at smoke end 10 feet long, placed ½ inch apart. The smoke box end of tubes to be closed at pleasure by a venetian blind damper. Chimney of ¼ inch iron outside, diameter 16 inches, top 6′ 6″ above crown of barrel, fitted with proper stack, cone, and sparker. Ash pan of ¼ inch plate made with 1½ inch angle iron, and band on upper edge, fitted with doors both before and behind, 7 inches deep and riding 6 inches clear of the rail. Steam pipes, 6 inch pipes of No. 10 copper running the whole length of the boiler, connected at the domes with 5 inch cast-iron stand pipes. Cast-iron branch pipes in smoke box leading to valve chests, 5 inches diameter. Throttle to be in a cast-iron chest in smoke box, as shown in drawing, having an area at least as large as the steam port. Changes of direction in pipes to be made by curves and not by angles. Exhaust pipe of No. 10 copper, 5 inches diameter at lower end, fitted with a variable blast orifice, ranging from eight to four square inches area, to be inclosed in a petticoat pipe.
Cylinders, 15 inches bore, and long enough for a 20 inch stroke, or 28¾ inches from outside to outside of ground faces, casting ⅞ inch thick, covers 1⅛ inch thick, placed level and firmly bolted to main frame and to horizontal truss brace, as shown in drawing; heads to go on with ground joint. Valve seat to have steam ports 14 × 1⅜ inches; exhaust port 14 × 2½ inches; outside lap of valve ⅝ inch, inside nothing; 1
16 inch lead on 4¾ inch throw of valve, gradually increasing as the throw is reduced, to scant 5
16. Steam chests bolted to a level face, ground joint with ¾ inch bolts pitched 4 inches.
Valve motion.—Shifting link with lifting shaft, sector, lever, rocker, etc., of the most approved form; four solid eccentrics of 5¼ inches throw, fastened to axle by four square ended set screws pressing hardened steel dies, cut with sharp grooves on their ends, against the axle; the friction of the dies against the axle holding the eccentric in place. Eccentric straps of cast-iron, with oil caps cast on, and grooved out inside so as to shut over the eccentric and exclude dust. Link forged solid and case hardened, 17 inches by 2¼ inches inside the slot; thickness of iron all around the slot 1½ inches, whole lateral thickness 2 inches. Eccentric rods of ⅞ iron 3 inches deep, 5½ feet between centres, fastened to link and to eccentric, as shown in the drawing. Link curved to a radius 6 inches less than the distance between the centre of driving axle and centre of link at mid gear. The links, boxes, stack, etc., to be of wrought iron, case hardened. Pistons with one outside composition ring and two circumferential grooves filled with Babbitt metal, and one inside ring of wrought iron; outside ring cut obliquely at one place with a small wrought iron flap on each edge to prevent leakage of steam at the point of division. Glands of piston and valve rod stuff boxes of cast-iron with tight brass or composition bushings.
Frame forged from good scrap 4×2 inches, the main bar being straight from end to end with pedestals welded on; the rear end piece to be a heavy forged foot plate, the front end an oak beam 7×14 inches placed on the flat side. All the pedestals on one side having adjustable keys. Flat boiler braces averaging 4½ × ⅞ inches with broad palms riveted to the boiler; the attachment at the furnace to be made by the Rogers expansion brace, details of the frame as in the drawing; frame to be placed true wherever needed to receive the working parts of the engine.
Wheels, axles, and springs.—Four cast-iron driving wheels tired with best flanged Ames’s tires 2 inches thick, diameter with tire five feet, tires to be turned to a true cone of .072 inches per wheel, wheels to be truly balanced. Rest scrap or bloom axles, front 7 and rear 6 inches in diameter, bearings 8 inches long, collars of cast-iron held by set screws, axles to be cylindrical and not smaller at the centre than at the end. Four springs of seventeen steel plates, each 4 × ⅜ × 40 inches; equalizing lever between springs. Inside bearing springs of truck hung from equalizer, which latter bears upon the axle boxes.
Slides, pumps, connecting rods, etc., etc.—Slides, flat wrought iron bars 3 × 1¼ inches, case hardened. Cross head bearing of cast-iron 16 inches long and 2 inches thick. Pumps, full stroke brass pumps 5
16 inch thick with 1⅞ inch plungers, ram of wrought iron with an eye fixed on cross head and worked by it. Waterways in body 2 inches, in valves 1¾ inches. Three ball valves with 2¼ inch hollow balls, one for suction and two for delivery; pipes ⅛ inch thick, 2 inches diameter, suction of iron, delivery of copper, cock of brass on delivery pipe worked by rod at cab. Air chamber on forcing side of pump equal to capacity of barrel; on suction side half the same. Flat connecting rods forged from solid piles without welds. Babbett lined boxes upon all stub ends. Straps held on each by two bolts, one key to each bearing. Safety-valves, one to be 3½ inches diameter, placed on the rear dome, and one forward, 4 inches diameter, both to be well fitted and supplied with the proper beams and spring balances. Barrel to be covered with hair felting ½ inch thick, to be furnished with a Russia iron jacket. Cylinders to be protected by an ½ inch felt coat and cased in brass.
The engine to have all the usual fixtures, bell, whistle, gauges, heater, pet, blow-off, and other cocks, name plates, oil cups, sandbox, tools, oil cans, etc., etc. Pilot to be 5 feet long, of flat horizontal wooden bars 2½ × 4 inches with a heavy centre piece, the whole to be well hung and firmly braced. Cab to be neatly built, with a projecting cornice, and windows, doors, etc., to be furnished in the best manner. The whole engine to be well painted and varnished. The draw bar to be strongly attached to the frame of the engine at 30 inches above the rail, and connected by a double elliptical spring to the centre beam of the tender.