Electric railway review (1906) (14572266349)

Identifier: electricrailwayr17amer (find matches)

Title: Electric railway review

Year: 1906 (1900s)

Authors: American Street and Interurban Railway Association

Subjects: Street-railroads Electric railroads

Publisher: Chicago : Wilson Co

Contributing Library: Carnegie Library of Pittsburgh

Digitizing Sponsor: Lyrasis Members and Sloan Foundation

Text Appearing Before Image:

ction 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 trolley,energizing the relay coils, raising the armature, and closing theconnection to the permanent ground. The second (or outer one) ofthe final contacts, bridged immediately afterward, de-energizes thesecond relay just as the first wTas de-energized, letting the armaturedrop and breaking the connection to permanent ground without anyarcing at the relay contacts. The trolley contact-maker has proved reliable and efficient,being strongly constructed, durable, placing no obstruction in the

Text Appearing After Image:

National Crossing Signal—Switching Device Attached to Trolley Wire Without Cutting. begins ringing, and continues to ring until car passes the highwaycrossing. This is accomplished as follows (see diagram, tracingdiagram from left to right): First—The trolley wheel throws the contact switch, whichbridges an insulated contact at entrance to the block, completinga circuit through the bank of lamps and bell to the trolley. Second—The wheel immediately throws another contact, com-pleting a circuit through relay coils, resistance, lights and bell to path of the trolley wheel, and giving sure, positive contact athigh speeds. The rail contact-maker, which is used for third-raillines, is strong and durable, being supported on heavy springswhich are clamped to the base of the running rail. The bell, a con-tinuous-current vibrator, is non-arcing and weather-proof. It re-quires no delicate adjustment, and is of a type that proves efficienton circuits of voltage as high as 500 or 600. The r

electric railway review 1907 book illustrations transportation industrial history history of technology electric power railroad industry railroads electric railways electric railroads images from internet archive

1906

Carnegie Library of Pittsburgh

http://commons.wikimedia.org/

public domain