. Il giornale ferroviario di strada. Età in-crease in Totallbs., vede. 20 1.46 81,100 95,220 14,120 77,400 172,020 Stand 30 .974 84,600 100,350 21,750 70,000 170,950 4.32 2.51 40 .730 89,400 110,540 30,140 63,150 182,690 10 24 5.84 SO .584 95,600 130,140 49,540 55,200 191,340 17.87 10.86 60 .487 104,600 158,870 54,210 42,050 201,460 29.0 16.7 70 .417 120,800 204,300 77,500 16,070 220,370 56.4 27.65 tempo specificato, il risultato è piedi-libbra-secondi. Tuttavia, per gli scopi attuali è più conveniente parlare di libbra-distor dell'area racchiusa dalla curva di forza di trazione. Quando il trattore
1752 x 1426 px | 29,7 x 24,1 cm | 11,7 x 9,5 inches | 150dpi
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. The Street railway journal . age In-crease in Totallbs., Sees. 20 1.46 81, 100 95, 220 14, 120 77, 400 172, 020 Slandd Standd 30 .974 84, 600 100, 350 21, 750 70, 000 170, 950 4.32 2.51 40 .730 89, 400 110, 540 30, 140 63, 150 182, 690 10 24 5.84 SO .584 95, 600 130, 140 49, 540 55, 200 191, 340 17.87 10.86 60 .487 104, 600 158, 870 54, 210 42, 050 201, 460 29.0 16.7 70 .417 120, 800 204, 300 77, 500 16, 070 220, 370 56.4 27.65 specified time, the result is foot-pound-seconds. It is, however, more convenient for present purposes to speak of pound-secondsor the area enclosed by the tractive force curve. When the tractiveresistance is added to the above, the pound-seconds for the start-ing period are 95, 220, and the running period requires 77, 400 may be reduced to an average of 5839 lbs. over the starting period. Fig 10 and the table of results show the way in which to applythe tractive force to obtain economical working. Since the completion of the portion of the paper given above, some two and one-half years ago, three new locomotives have been. UtPHAHT as T5 100 ias BORIS.iso 175 zoo aas aso a?s too City. Time in seconds. FIG. 13.—TEST OF LOCOMOTIVE NO. 19, STOCKWELL TO CITY pound-seconds, making a total of 172, 620 pound-seconds for therun. The table in the next column gives the results of the six sets, and is self-explanatory. This table shows the enormous advantage to be gained by adopt-ing the highest acceleration compatible with the practical detailsof motor design. It fortunately happens, however, that we have added to the rolling stock of the City & South London Railway, and twelve more are now in course of construction. DESCRIPTION AND TESTS OF LOCOMOTIVES Locomotives 19 and 20.—In view of the heavier trains, etc., itwas decided to build more powerful locomotives. The size ofthe locomotive cab was practically limited to the same over all 396 STREET RAILWAY JOURNAL. [Vol. XV. No. 6. dimensions as the old locomotives on account of local conditions, and it was therefore necessary to get la
