MAEIElSTJ^ELDE-ZOSSETSr ELECTEIC-RATLWAY TRIALS. 



327 



wheel with or without the ag-eney of compressed air. These equip- 

 ments have given satisfactory results with hoth carriages and proved 

 very effective, affording- full protection against the electric current. 



Transformers. — The main characteristics of the transformers used 

 in each of the cars are as follows: 



In the transformers of the Siemens & Halske car the effective iron 

 sheets are placed vertically on their small edges and distributed in 

 groups, l)etween which there is space for the passage of air. The 

 secondary coil is well insulated from the iron cores, the coils of the 

 primary winding being placed above it. In the ventilating channel 

 of the iron cores there are protective boxes prolonged as far as the 

 front plates of the casing and exuanding into the latter so as to facili- 

 tate the drawing in of the air. 



SuspfiisidU of the motor on the All,L,'emeine Elektrizitiits-Gosellsehaft cur. 



Tlu; transformers in the Allgemeine Elektrizitats-Gesellschaf t car are 

 designed, according to the patents of this company, with three parallel 

 iron cores, the axes of which rui\ longitudinalh". Each iron core is 

 provided with a longitudinal slot, through which, as well as between 

 the rectangular cores and the round coil, an air current is allowed to 

 pass. The transformers in both cars have given full satisfaction, the 

 strong air currents proving particularly effective and pre^'enting any 

 considerable heating effects. 



The motors.— T\\Q. motors of the Allgemeine Elektrizitats-Gesell- 

 schaf t car are designed for an output of 250 horsepower each, provided 

 with fork-bar coils. The exciting current has a tension of 435 volts. 

 The motor cases are fixed on an iron frame supported on l)oth sides of 

 the carriage by plate springs, each of which is lixed on tlie main ])ear- 

 ing spring of the car. The motor casings each bear a hollow axle, 

 SM 11H)3 22 



