Canadian engineer . rs were called for the work on July loth, 1910,and the contract awarded to Messrs. Seaman and Penniman,of Fort William, on August 2nd. Owing to delays in secur-ing materials the work was slow in progressing, so that itwas late in the fall before the concrete work for both bridgeswas completed. All the forms were left on the bridgethrough the winter, and early in the spring of igii the woodblocks were laid, railing set up, and the bridges properlyfinished. The contractors are deserving of great praise forthe work they did, their methods of working, and the dili-gent manner i
Canadian engineer . rs were called for the work on July loth, 1910,and the contract awarded to Messrs. Seaman and Penniman,of Fort William, on August 2nd. Owing to delays in secur-ing materials the work was slow in progressing, so that itwas late in the fall before the concrete work for both bridgeswas completed. All the forms were left on the bridgethrough the winter, and early in the spring of igii the woodblocks were laid, railing set up, and the bridges properlyfinished. The contractors are deserving of great praise forthe work they did, their methods of working, and the dili-gent manner in which they attendied to all the details of theform work, etc., had a good deal to do with the successfulcarrying out of the designs. Construction.—The reinforcing steel used in the con-struction of the bridges was the Kahn Svstem of Reinforc-ing, and was furnished by the Trussed Concrete Steel Co.,of Walkerville, Ontario. In order that contractors, couldtender on the same basis, as regards the reinforcing steel,. [^3^iMi_|^^ Reinforced Concrete Cirder Bridge over Current River, Port Arthur. Section at Centre Span, Showing Balcony. Allowable working stress for concrete :— (i). The extreme fibre, 750 pounds per square inch. (2). Direct compression, 600 pounds per square inch. (3). Shear, 50 pounds per square inch. Concrete.—The cement used in the concrete was Lehighbrand, Portland cement, which, when tested, had to meet therequirements of the cement specifications of the Canadian the city purchased it direct and delivered it the siteof works. After the footings were set in place, the form work wascommenced on the columns, girders, and abutments. Thesteel in the columns was then set in place, and the abut-ments and columns were poured to the level of the underside of girders. The forming was then constructed for the 288 THE CANADIAN ENGINEER Volume 22. entire work on both bridges, according- to the details shownin the plans presented herewith. Great care was exe
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