. An elementary book on electricity and magnetism and their applications. Fig. 353. —- Street-car motor withtop of case lifted up. 504 ELECTRICITY AND MAGNETISM in figure 354 show in a graphic way the relation between thecurrent used and the tractive effort, speed, and efficiency ofa modern railway motor. s a > . s s^ 1 l«B- S .w J3 / & S U / V / O / / / / tt \ / \ \ / / V \ / \ / with G ?u L&p fr •4ft .-•i Vj 10 <i -00 0 0 0 - GE-208 p\i 0 10 20 30 40 50 60 70 80 90 100 110 120 130Amperes Fig. 354. — Characteristic curves of a ventilated railway motor with commu- tating poles. 346. Spee
. An elementary book on electricity and magnetism and their applications. Fig. 353. —- Street-car motor withtop of case lifted up. 504 ELECTRICITY AND MAGNETISM in figure 354 show in a graphic way the relation between thecurrent used and the tractive effort, speed, and efficiency ofa modern railway motor. s a > . s s^ 1 l«B- S .w J3 / & S U / V / O / / / / tt \ / \ \ / / V \ / \ / with G ?u L&p fr •4ft .-•i Vj 10 <i -00 0 0 0 - GE-208 p\i 0 10 20 30 40 50 60 70 80 90 100 110 120 130Amperes Fig. 354. — Characteristic curves of a ventilated railway motor with commu- tating poles. 346. Speed control. In the old days of small cars equippedwith a single motor the speed was controlled by a rheostat and the old-fashioned handbrakes which had beenused on horse cars. Butmodern cars are providedwith two or four motors^ ot,c, „, . .. , ±. mounted on trucks, as riG. 355. — klectnc-railway truck supporting . a motor on each axle. shown in figure ELECTRIC TRACTION 505 Trolley Trolley
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmagnetism, bookyear19
