File:Electric railway review (1906) (14780844243).jpg

Identifier: electricrailwayr19amer (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

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
icoat, leaving themessenger wire in the top still well insulated. The messenger wire insulators are cemented on malleableiron pins, the pins being adjustable on bracket arms com-prising 10-foot 6-inch lengths of T-bar and %-inch supportingrods, as illustrated in detail. Where the line is double-tracked from Washington to ground wire of A-inch galvanized steel strand is strung alongthe tops of the poles, which line is grounded at every fifthpole. On each bracket at the back of the pole casting, and inelectrical contact with the latter, is mounted a ground plate,which is connected by a wire with the ground line extendingalong the tops of the poles. By this arrangement eachbracket is thoroughly grounded. On curves as conditions demand the messenger and trol-ley are guyed by wires extending from porcelain strain in-sulators mounted on the poles, out to the suspension- rodson each side of the bracket. On tangent track steady bracesare installed on every tenth pole. At sidings the main line
Text Appearing After Image:
Washington Baltimore & Annapolis—Section Insulators Where Change of Current is Made. Baltimore a pole line is erected on each side of the right ofway, carrying the side brackets for suspending the trolleywires. The poles, which are painted with carbolineum, arespaced 150 feet apart. This pole spacing is not reduced ex-cept on curves sharper than 6 degrees. Each pole carries abracket of the type illustrated. At the outer end of each and switch track trolley wires are parallel, but no switch panis used. Where the line passes under bridges the structureoverhead is protected by a galvanized iron trolley troughgrounded to the rails. In Baltimore the cars are operated over the city tracksby direct current at 500 volts potential taken from span sup-

Note About Images