Canadian engineer . lly designed, its stress conditionsare certainly indefinite, owing to the combination ofcurved arch slab and vertical ribs, fastened rigidlytogether. June 27, 1912. THE CANADIAN ENGINEER 849 (5) Surface Treatment.—The surface treatment of thenew bridge at Rome, with a fine flat face on the centre por-tion, resembling cut stone, and moulded blocks on the abut-ments, is excellent, being similar to that of the Sandy Hillbridge over the Hudson River, the Connecticut Avenuebridge at Washington, and the Chatellerault bridge over theVienne (Fig. 8) built by M. Hennebique, 1899. In
Canadian engineer . lly designed, its stress conditionsare certainly indefinite, owing to the combination ofcurved arch slab and vertical ribs, fastened rigidlytogether. June 27, 1912. THE CANADIAN ENGINEER 849 (5) Surface Treatment.—The surface treatment of thenew bridge at Rome, with a fine flat face on the centre por-tion, resembling cut stone, and moulded blocks on the abut-ments, is excellent, being similar to that of the Sandy Hillbridge over the Hudson River, the Connecticut Avenuebridge at Washington, and the Chatellerault bridge over theVienne (Fig. 8) built by M. Hennebique, 1899. In con-nection with surface treatment, it is interesting to note theefforts made in this direction since concrete bridges werefirst introduced. The Romans made extensive use of con-crete in the body of their piers and arches, the surface beingfaced with travertine, their constructive methods being veryplainly visible on the portion of old Ponte Rotto (Fig. 9)which still remains. The system of construction was. Fig. 5.—Meadow Street Bridge, Pittsburg. extensively used on public works during the latter half ofthe eighteenth and the first part of the nineteenth centuries,but it was not until 1840 that a bridge was made almostwholly of concrete at Grisoles in France. It was the workof the eminent French engineer, M. Le Brun, who erecteda span of 39 feet 4 inches over a branch canal of the only place where material other than concrete was usedvvas in the exposed end of the arch ring, which was facedwith brick, and the four vertical abutment edges below thesprings, which were faced with stone. All other exposedsurfaces, including the soffit and spandrels, were of con-crete. Ten years after the completion of this little bridge.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishertoron, bookyear1893
