. The American railway; its construction, development, management, and appliances . Fig. 32.— Forney Tank Locomotive. By the Rogers Locomotive and MaciiineWorks, Paterson, N. J. Type. Cylinders. American Passenger i8 24 Mogul Freight 19 24 Ten-wheel Freight 19 24 Consolidation 20 24 Decapod Freight 22 26 Four-wheel Tank Switchingi 15 24Six-wheel Switching, with tender , 18 24 Forney N. V. 11 16Street-car Motor Locomo-tive I 10 14 Diameter ofdriving-wheel. 62 to 68SO to 5650 to 58 SO 46 50 5042 35 Weight ofengine inworking or-der, exclus-ive of tender Weight ofengine andten
. The American railway; its construction, development, management, and appliances . Fig. 32.— Forney Tank Locomotive. By the Rogers Locomotive and MaciiineWorks, Paterson, N. J. Type. Cylinders. American Passenger i8 24 Mogul Freight 19 24 Ten-wheel Freight 19 24 Consolidation 20 24 Decapod Freight 22 26 Four-wheel Tank Switchingi 15 24Six-wheel Switching, with tender , 18 24 Forney N. V. 11 16Street-car Motor Locomo-tive I 10 14 Diameter ofdriving-wheel. 62 to 68SO to 5650 to 58 SO 46 50 5042 35 Weight ofengine inworking or-der, exclus-ive of tender Weight ofengine andtender with-out water orfuel. Pounds. Pounds. 92,00096,000 110,000116,000 100,000 118,000 120,000150,00058,000 132,000 165,000 47,000 84,000 98,000 42 00022,000 34,000 f18,000 -I 11 Approximateprice. $8,750 9,500 ,50013,250 . 8,500 4,500 $3,500 to.$4,000 according to design. Price perpound. 7-95 1323 19 44 to22 22 THE LAW OF SPEED. 127. g- 33-— Hudson Tank Locomotive. By the Baldwin Locomotive Wl The speed of locomotives, however, has not increased with theirweight and size. There is a natural law which stands in the wayof this. If we double the weight on the driving-wheels, the adhe-sion, and consequent capacity for drawing loads, is also in an analogous way, it might be said that it we doublethe circumference of the wheels the distance that they will travel inone revolution, and consequently the speed of the engine, will be inlike proportion. But, if this be done, it will require twice as muchpower to turn the large wheels as was needed for the small ones;and we then encounter the natural law that the resistance increasesas the square of the speed, and probably at even a greater ratio atvery high velocities. At 60 miles an hour the resistance of a trainis four times as great as it is at 30 miles. That is, the pull on thedraw-bar of the engine must be four times as great in the one caseas it is i
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