The encyclopdia britannica; a dictionary of arts, sciences, literature and general information . Fig. 3.—Ponte Salario. being 62 ft.* _ Dio Cagliusi mentions a bridge, possibly 3000 to4000 ft, in,length, built by Trajan over the Danube in 104,Some piers are said stUl to exist. A bas-rehef on shows/.this bridge with masonry piersfand ttnjbej/ arches,but the representation is probably, conventional (fig. 1). Trajanalso GQiistructed the bridge of Alcantara in Spain;:(fig. 2), of atotal r length, of ft., at 210 ft. above-thestreairL This hadsix atches and was built of i
The encyclopdia britannica; a dictionary of arts, sciences, literature and general information . Fig. 3.—Ponte Salario. being 62 ft.* _ Dio Cagliusi mentions a bridge, possibly 3000 to4000 ft, in,length, built by Trajan over the Danube in 104,Some piers are said stUl to exist. A bas-rehef on shows/.this bridge with masonry piersfand ttnjbej/ arches,but the representation is probably, conventional (fig. 1). Trajanalso GQiistructed the bridge of Alcantara in Spain;:(fig. 2), of atotal r length, of ft., at 210 ft. above-thestreairL This hadsix atches and was built of i stone blocks without cement. Thebridge of Narses, buHt in the 6tli century (fig. 3), carried the ViaSalaria over the Anio. It was destroyed in 1867, during theapproach of Garibaldi to Rome. It had a fortifieation such asbecame usual in later .bridges,for defence or for the enforcernentof toUs.: . The great hues of aqueducts biiUt by Roman engineers,and dating from 300 onwards, where they are carried above. Fig. 4.—First Spaii of Schaifhausen Bridge. ground,: are arched bridge structures of remarkable imagnitude(see Aqueducts, § Roman).. They are generally of brick, andconcrete. - ,5; Medieval and other Early Bridges.— stonepiers and timber superstructures were no doubt: constructedfrom Roman times onward, but they have perished. Fig. 4shows a timber bridge erected by the brothers Grubenmann atSchafihausen about ;the middle of the i8th century. It hadspans of 172 and 193 ft,,, and may be a representative
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectencyclo, bookyear1910
