. Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition . ON MOTORS OCONTACTS ON CONTROLLING CYLftSDER. Q CONTACTS ON BRAKE CVLlNOtR A CONTACTS QN REVERSING CYLINDEIR Fig. 97. — Wiring Diagram of Connections, Showing Operation of /Magnetic Brake the motor terminals is regulated. As the motors are short-circuited through the brake coils, and as series motors actingas generators are susceptible to changes in speed, the importanceof this device is evident. The regulator is adjustable so that it ispossible to vary the maximum voltage, and hence the ma
. Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition . ON MOTORS OCONTACTS ON CONTROLLING CYLftSDER. Q CONTACTS ON BRAKE CVLlNOtR A CONTACTS QN REVERSING CYLINDEIR Fig. 97. — Wiring Diagram of Connections, Showing Operation of /Magnetic Brake the motor terminals is regulated. As the motors are short-circuited through the brake coils, and as series motors actingas generators are susceptible to changes in speed, the importanceof this device is evident. The regulator is adjustable so that it ispossible to vary the maximum voltage, and hence the maxi-mum current which can be drawn by the brakes, for a givenspeed. The extreme values of braking current and pressuregenerated by the motors are shown in the data following, andare considered in the discussion at the end of the chapter. General Description of the general method of conducting the tests consisted inbringing the car to a given speed, beginning braking at a fixedpoint on the track, and then operating the controller according 344 ELECTRIC RAILWAY TEST COMMISSION. •| BRAKING TESTS ON A SINGLE-TRUCK CITY CAR 345 to a given schedule, the time of passing from notch to notchof the controller being accurately determined by means of astop watch, and in accordance with a predetermined run was repeated and the average of the two tests used,in order that the data obtained might be substantially automatic regulator was adjusted by representatives of theWestinghouse Traction Brake Company before these tests wereperformed, to conform to service conditions on a level adjustment of the regulator remained unchanged through-out the braking tests. As the automatic regulator was not varied, there remainedbut two other general conditions which entered into the methodof conducting the tests. These may be classified as RunningConditions and Method of Applying Brake. Running Conditions. — All rims were made from west toeast, the start be
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