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earthwork

construction

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Downs

  • Folkestone
    In Downs

    …burial mounds or barrows; defensive earthworks; and ring encampments, such as Maiden Castle in Dorset.

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moats

  • castle
    In moat

    …early methods of fortification by earthworks, for the ditch produced by the removal of earth to form a rampart made a valuable part of the defense system. When, in the Middle Ages, earthworks gave way to masonry walls, the moat was retained and became even more valuable than before, as…

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cable structure, Form of long-span structure that is subject to tension and uses suspension cables for support. Highly efficient, cable structures include the suspension bridge, the cable-stayed roof, and the bicycle-wheel roof. The graceful curve of the huge main cables of a suspension bridge is almost a catenary, the shape assumed by any string or cable suspended freely between two points. The cable-stayed roof is supported from above by steel cables radiating downward from masts that rise above roof level. The bicycle-wheel roof involves two layers of tension cables radiating from an inner tension ring and an outer compression ring, which in turn is supported by columns.

This article was most recently revised and updated by J.E. Luebering.