1280
THEORY AND PRACTICE OF ENGINEERING.
Book II.
36 inches, and length 89 ; in this were 64 tubes, 2 inches in diameter. The length of the fire-box 21$ inches, width 41, and height above the bars 38.$ inches. The area of the fire-boxexposed to radiant heat 37 square feet, and the area of the fire-grate G feet 1 inch, and thatof the tubes 262 feet 6 inches. The weight of this engine without water in the boiler was 145cwt., and when filled 170 cwt.; the length of steam-way to cylinder 6 inches, and width1$ inch.
A 12-inch cylinder, with an 18-inch stroke, made for the Paris and Versailles Railroad, hada boiler 39 inches in diameter, and a length of 8 feet, with 121 tubes, 1| inches in diameter.Hie length of the fire-box 30 inches, width 41$, and height above the bars 40;j inches ; thearea of the fire-box exposed to the heat 46 superficial feet, and that of the fire-grate 8 feet7 inches. The area of the tubes in contact with the heated air was 428 feet 3 inches ; itsweight, without water, 172 cwt. and with, 200 cwt.
A 13-inch cylinder, made for the Grand Junction , with an 18-inch stroke, had the boiler39 inches in diameter, and 8 feet in length : there were 130 tubes, 1| inches in diameter :the length of the fire-box 32 inches, width 41$, height above the bars 421; the area of thefire-box 49$ superficial feet?and that of the fire-grate 9 feet 2 inches; the area of the sur-face of the tubes 460$ feet. The weight of this engine without water, 175 cwt., and 203cwt. when filled.
A 14-inch cylinder, and 18-inch stroke, on the Newcastle and Carlisle line, had itsboiler 42 inches in diameter, and 8 feet 6 inches in length, which contained 115 tubes 2inches in diameter. The length of the fire-box 36, the width 41$, and the height abovethe bars 44 inches ; the area of the fire-box 54 feet, and that of the fire-grate 10 feet 4inches. The area of the tubes 532 feet, and the weight of the entire engine, without waterin the boiler, 205 cwt., and with, 235.
A 16-inch cylinder, on the Great Western, with a length of stroke of 20 inches, hasits boiler 44 inches in diameter, and 8 feet 8$ inches in length : there are 135 tubes, 1|inches in diameter. The length of the fire-box 44$ inches, width 60, and height 47 ; thearea of the fire-box 108$ feet, and that of the fire-grate 17 feet 2 inches; the area ofthe tubes exposed 516 feet.
The locomotives constructed for the Southampton! Railway by the Messrs, Rennie, ofHolland Street, London , combined all the improvements that had been made up to thatperiod. The diameters of the cylinders were 13 inches, the length of the stroke 18 inches,and the area of each of the cylinders was 132^ inches; there were 118 brass tubes, andthe heating surface 493 feet: the area of the fire-grate 9 feet 4 inches, containing 14 cubefeet of fuel: the water in the boilers was a little more than 36$ cube feet, and the spacefor the steam was 32$ cube feet. The water evaporated in an hour, with steam equalto 50 pounds pressure on the safety-valve, was 63$ cube feet,show the other proportions : —
Water supplied by each pump, per strokeDiameter of the driving wheels -of the small -
Cubic content of water in tender tank -Weight of ditto when full -
Time which the water in tender will supply engineCoke fuel necessary to evaporate all the water in the tankNumber of revolutions of driving-wheel per minute, at 30miles per hour - - -
Velocity of each piston in feet per minute, at the averagespeed of 3 miles per hour -
Area of steam pipe -
of steam ports -
of eduction pipes -
of blast pipe mouth - - -
of chimney -
of radiating surface -
of communicating surface -
of total heating surfaee -
Total resistance to the motion of the pistons per square inchon its surface -
Volume which the whole steam produced per hour will occupyat the reduced pressure of the preceding resistanceRatio of the preceding volume to that expended in effecting asingle stroke of one piston, number of strokes per hourCorresponding number of revolutions of driving-wheel,
Weight of the engine without water -Ditto of tender
The following table will
56*5 cube inches.5 feet 6 inches.
3 feet 6 inches.
118*8 cube feet.
3*3 tons.
1*87 hours.
9$ cwt.
152*76
458-28
9*62 square inches.9*56 —
14*87 —
7*06 —
159* —
6696* —
70960* —
77650* —
38*4 pounds.46695 cube feet.32427
8106*75 per hour.26;\ miles.
11$ tons.
5i —