. Giornale ferroviario elettrico . eved oneri onerosi e tasse eccessive. Osservatore. 684 GIORNALE FERROVIARIO ELETTRICO [VOL XVIII, N. 14 alcuni recenti progressi NELLE ATTREZZATURE E NELLA MANUTENZIONE del controller portatile per la movimentazione di autocarri nei negozi - TrolleySplice rinforzato per costruzioni catenarie - Polie raddrizzatrici con PivotedJack - nuovi segnali del contattore - bracci a staffa lunga utilizzati DuringConstruction - Dispositivo di regolazione automatica del gioco per i bracci a staffa lunga insolitamente inclinati dei freni per autocarri singoli DI G. H. MCKELWAY Line Engineer Brooklyn Rapid Transit System per evitare interferenze tra i cavi costruiti
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. Electric railway journal . eved ofonerous burdens and excessive taxation. Observer. 684 ELECTRIC RAILWAY JOURNAL [Vol. XLVIII, No. 14 Some Recent Advances in EQUIPMENT AND ITS MAINTENANCE Portable Controller for Moving Trucks in the Shops—Reinforced TrolleySplice for Catenary Construction—Straightening Poles with PivotedJack—New Contactor Signals—Long Bracket Arms Used DuringConstruction—Automatic Slack Adjuster for Single-Truck Brake Rigging Unusually Long Bracket Arms BY G. H. MCKELWAY Line Engineer Brooklyn Rapid Transit System In order to avoid interference between a cablewayconstructed by a contractor for digging a sewer in animportant street and the span construction in use forsupporting the trolley wire, it was necessary to removethe spans from the poles on the side of the street wherethe contractor was working and to support the trolleywire from mastarms attached to the poles on the op-posite side of the street. Such practice on double-tracklines is not common unless the tracks are at one side. LONG BRACKET ARM USED DURING CONSTRUCTION WORK of the street where they can be spanned with ease by acomparatively short bracket. In the work in question the tracks were in the centerof a comparatively wide street, the width being 80 ft.between house lines and 44 ft. between curb lines. In order properly to support the trolley wire over thefar track it was necessary to make the arms 31 ft. 6 in.long, or of a length greater than the supporting poles, which were of steel and 30 ft. long. Not only were thearms actually longer than the poles but their apparentlength was increased by the fact that the poles wereset 6 ft. in the ground, so that the arms appeared tobe almost 75 per cent longer than the poles. The arms were made of 3-in. pipe, each supported bytwo guy rods leading up to the pole. As the poles werenot long enough to take these rods at their proper anglethe poles were lengthened by the insertion of woodenextensions set into the tubing after the caps
