Electrical news and engineering . Pneumatic tools are made extensive use of by the Toronto TransportationCommissions construction forces. Pneumatic drills break up oldconcrete and pavement, while pneumatic tamping tools are employedto bring up the new tracks to grade. *> rails are thoroug^lily bonded by being welded together solidly. Theillustration shows the welding operation in progress, the plate beingbonded to the rail alons its full length at both (ap and bottdm. 44 THE ELECTRICAL NEWS lb. A. R. A. T sections have been employed. These railsarc carried on oak or jack pine ties, 8 ft. lo
Electrical news and engineering . Pneumatic tools are made extensive use of by the Toronto TransportationCommissions construction forces. Pneumatic drills break up oldconcrete and pavement, while pneumatic tamping tools are employedto bring up the new tracks to grade. *> rails are thoroug^lily bonded by being welded together solidly. Theillustration shows the welding operation in progress, the plate beingbonded to the rail alons its full length at both (ap and bottdm. 44 THE ELECTRICAL NEWS lb. A. R. A. T sections have been employed. These railsarc carried on oak or jack pine ties, 8 ft. long, 6 in. thick and8 in. wide, and spaced at 2 ft. centres, standard tie platesbeing used if the ties are of soft wood. The whole track isthen carried on a concrete or crushed stone foundation. The gauge of street railway tracks in Toronto is 4 7/8 in. and on double track construction the commissionis laying the tracks to 10 ft. 2 7/8 in. centres, giving a 5 in. devil strip. The rails are laid with joints 1 ?, 1 1 -,- ^ t Yf r :iq ally welded to whether single or double track. They are tight-butted andthe joint plates are welded to the rails along the top and bot-tom. Tie rods are inserted every six feet. Electric Welding the BondsThe bond plates used were 24 in. long by H in. thick,with four holes; see plan herewith. By means of bolts theplates were drawn tightly into position, as the first essentialis a good mechanical joint. Both the plates were welded topand bottom by the Lincoln process method, which consists oflaying a 9/32 special low carbon rod at the joint between theplate and rail. A dynaniotor, taking current from the trolley,furnishes 400 amperes at 35 volts at the arc; a 5/16 carbonpencil is used. The arc penetrates half into the rail and halfinto the plate, driving in the filler rod, making a mechanicaland electrical joint at the same time. This process, which isfaster than the metallic welding, is made possible by the useof a copper defining
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