. Electric railway review . National Crossing Cignal—Relay and Case as Mounted Near Contact Ma. National Crossing Signal—DiMovement, w agram ofith Trolley Circuits for Single-TrackContacts. National Crossing Signal—Spring-Supported Contact Maker asInstalled on the Aurora Elgin & Chicago Railway. silence the signal, the connection is such as to send an impulse ofsame polarity as that of grounded circuit at the relay, through aconductor of practically no resistance as compared with the relaycoils and relay resistance. This de-energizes the relay coils, break-ing the connection to ground at the r
. Electric railway review . National Crossing Cignal—Relay and Case as Mounted Near Contact Ma. National Crossing Signal—DiMovement, w agram ofith Trolley Circuits for Single-TrackContacts. National Crossing Signal—Spring-Supported Contact Maker asInstalled on the Aurora Elgin & Chicago Railway. silence the signal, the connection is such as to send an impulse ofsame polarity as that of grounded circuit at the relay, through aconductor of practically no resistance as compared with the relaycoils and relay resistance. This de-energizes the relay coils, break-ing the connection to ground at the relay while a current is passingthrough the low-resistance shunt caused by the car bridging thecrossing contact. Thus any arcing at relay contact points is ob-viated. Fourth—Leaving the highway crossing, the car makes two finalcontacts at the remote end of the block. The first (or inner) con-tact sends an impulse to the contact connected with the armatureof the second (right-hand) relay; thence through the winding ofthe coils, the resistance, the lights, and the bell, to the trolle
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectstreetr, bookyear1906
