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George Ticknor, Life, letters and journals of George Ticknor (ed. George Hillard) 10 0 Browse Search
Harper's Encyclopedia of United States History (ed. Benson Lossing) 5 3 Browse Search
Knight's Mechanical Encyclopedia (ed. Knight) 2 0 Browse Search
Lydia Maria Child, Letters of Lydia Maria Child (ed. John Greenleaf Whittier, Wendell Phillips, Harriet Winslow Sewall) 2 0 Browse Search
George Ticknor, Life, letters and journals of George Ticknor (ed. George Hillard) 2 0 Browse Search
Jula Ward Howe, Reminiscences: 1819-1899 2 0 Browse Search
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Browsing named entities in Knight's Mechanical Encyclopedia (ed. Knight). You can also browse the collection for Loretto, Pa. (Pennsylvania, United States) or search for Loretto, Pa. (Pennsylvania, United States) in all documents.

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Knight's Mechanical Encyclopedia (ed. Knight), B. (search)
from the specification extant. It was founded upon piles driven into the bed of the river. The piles were united by a beam, on which were laid joists in the direction of the length of the bridge. Upon the joists were laid hurdles supporting the road-bed. An inclined fender protected the piers up stream, and each pier was stayed below by a cluster of piles. It was built in ten days. A magnificent bridge with four stone arches was built by Augustus near Narni, on the road from Rome to Loretto. The arches were respectively 75, 135, 114, and 142 feet span. One arch remains. The bridge of Trajan (b, Fig. 924), which crossed the Danube, was one of the greatest engineering works of antiquity. It was constructed of timber resting upon stone piers. Each span consisted of three rows of concentric arches, united by bindingpieces formed upon each division; these abutted upon timbers radiating with the curve, which were framed into heads and sills, again strengthened by braces and s