. Electric railway journal . opping contactor needs only to be temporary, and,although the contact is closed at the stopping contactoras the trolley wheel leaves it, there will be no com-plete circuit. The motor, therefore, will stop and themechanism will be ready to operate again. If a car approaches the starting contactor with themotor current off, there will be no action, as the trolleywheel crosses the first contact strip because only thelow-resistance relay is connected to this first strip andthis is so adjusted that the current consumed by theheaters, lights and compressor is not suffici
. Electric railway journal . opping contactor needs only to be temporary, and,although the contact is closed at the stopping contactoras the trolley wheel leaves it, there will be no com-plete circuit. The motor, therefore, will stop and themechanism will be ready to operate again. If a car approaches the starting contactor with themotor current off, there will be no action, as the trolleywheel crosses the first contact strip because only thelow-resistance relay is connected to this first strip andthis is so adjusted that the current consumed by theheaters, lights and compressor is not sufficient to liftits armature. As the trolley wheel reaches the secondcontact strip of the starting contactor, a circuit willbe completed through the high-resistance relay andthrough a resistance to ground. This will completethe stick-circuit with the high-resistance relay arma-ture above the other armature. The circuit will thenbe fed in the opposite direction through the motorfields and cause the motor to revolve in the opposite. NON-SPLASHING TRACK SWITCH—STARTING ANDSTOPPING CONTACTORS direction, throwing the switch for the straight track. The starting contactor is very simply mounted onstandard cars without taking up any slack in the trolleywire. It is only about one-third the size of any pre-vious contactor used on electric track switches. Thestopping contactor is about one-half the size of thestarting contactor, and is mounted on a standard relay and resistance box is also small. It is pro-vided with a cut-out switch for deadening all the con-nections in the box. The main street box, of course,is the most interesting part of the device. It is 2 1 ft. x 7 in. in dimensions and provided with a loose-fitting street cover to take the street traffic. There isan inner cover which has a flange running all the wayaround it and this flange sets into a ditch cast in thebox. The ditch is partially filled with mercury, so thatby setting this cover in place the box is automa
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
