. Electric railway journal . ric llo Journal Fig. 1 — Wiring When But One Breaker Is Used at a Time the tripping arrangement will release the main con-tacts, but the dirt will prevent these from parting suf-ficiently to break the circuit, causing them to hold aheavy arc and to set fire to whatever may be around first thought the answer to this is very simple,namely, clean the apparatus thoroughly on regular in-spection. However, on some lines running throughdusty territory, a few days suffice for the breaker togather enough dust to change the blowing point, if notto prevent its blowing e
. Electric railway journal . ric llo Journal Fig. 1 — Wiring When But One Breaker Is Used at a Time the tripping arrangement will release the main con-tacts, but the dirt will prevent these from parting suf-ficiently to break the circuit, causing them to hold aheavy arc and to set fire to whatever may be around first thought the answer to this is very simple,namely, clean the apparatus thoroughly on regular in-spection. However, on some lines running throughdusty territory, a few days suffice for the breaker togather enough dust to change the blowing point, if notto prevent its blowing entirely. Many cars are wired with the trolley and circuitbreaker connected as shown in Fig. 1. The main trol-ley is connected between the two circuit breakers atopposite ends of the car, and only one breaker is usedat a time according to the direction of running. Ifthe cars are wired in this manner, the circuit breakerat the rear should always be thrown off by the motor-man when he stops operating from that end of the Electric Ry Journal Cross-Section of Concrete Track Construction Taken UpAfter Service of Eighteen Years Because ofWornout Rails cuit-BreakefiJ To Controller hums. Circuit-Breaker To Controller JChokeCoilElectric lly Journal Fig. 2—When Both Breakers Are in Series engineer, it was opposed as unnecessarily practice, however, the many advantages asserted forit by Mr. Johnston have been realized, namely, longlife, minimum maintenance of track and cars, no looserail bonds and no bad effect on the alignment of thetrack after heavy spring thaws. The track is nowbeing rebuilt after very heavy service for eighteenyears. The cross-ties, though not treated, are still ina very good state of preservation. Repairs are beingmade on account of the wornout rails. It is interesting to note that the first 90-lb., rails manufactured were first used in Richmondby Mr. Johnston, who also built, in Richmond in 1888,the first commercial electric street
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