Identifier: canadianengineer22toro (find matches)
Title: Canadian engineer
Year: 1893 (1890s)
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Subjects:
Publisher: Toronto, Monetary Times Print. Co. (etc.)
Contributing Library: Engineering - University of Toronto
Digitizing Sponsor: University of Toronto

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dings and other works. It is, indeed, known that concrete was much usedmany years before the Christian era, not only in Rome, butin Greece, Etruria, Assyria, India, and China, and it is alsofound in the Pyramids, the Walls of Babylon, as well as inthe Great Wall of China. Occasional evidences of the useof concrete in bridge construction after the fall of Romestill remain, as in the bridge at Amalfi, Italy, built by theMoors in the sixth century. The Risorgimento bridge (Fig. 2) over the liber atRome, with its clear span of 328 feet (100 meters) is inmany ways a striking contrast to those adjoining it, and itis probable that if the old Roman engineer, Lucius Fabricius,who built bridges over the Tiber in the early part of thefirst century, could examine the latest one, he would likelyview it with suspicion and disapproval. The new bridge has a deck 65 J^ feet wide at a height of47 feet above low water, and it crosses the Tiber with asingle span. Compared with other concrete bridges, the
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Fig. 1.—Pons Aemilius. next longest one Fig. 3) is at Auckland, New Zealand, with aspan of 320 feet, and its deck 147 feet above water. In Americathe longest concrete spans are those at Larimer AvenuePittsburg; Monroe Street, Spokane, and Detroit Avenue,Cleveland, with spans of 312 feet, 281 feet and 280 feet re-spectively. In Continental Europe the next longest con-crete arch is that at Stein, Switzerland, over the SitterRiver, with a length of 259 feet, (Fig. 4) though the stonearch at Plauen, Germany, has a span of 296 feet. In GreatBritain, the longest concrete spans are those over the NoreRiver at Kilkenny, with a single opening of 140 feet, and a very fiat rise, completed inNovember, 1910; and theslender foot bridge at MizenHead, crossing the narrowchannel to an island at thesouthwest extremity of Ire-land, the length of span being172 feet, and the deck 150feet above water. The most interesting fea-tures of the Risorgimentobridge are: (i) foundations,(2) flat rise, (3) hollows

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