CIT. VI 



EFFICIENCY 



141 



VARIATION OF EFFICIENCY WITH SPEED 

 25 H.P. STREET RAILWAY MOTOR 



FIG. 35 



VARIATION OF EFFICIENCY WITH POWER 

 is H.P. STREET RAILWAY MOTOR. 



5 10 



20 Z5 50 35 



E M P AT MOTOK T t I 



50 55 6Q 



FIG. 30 



