drawbridge

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drawbridge:

see bridgebridge,
structure built over water or any obstacle or depression to allow the passage of pedestrians or vehicles. See also viaduct. Early Bridges

In ancient times and among primitive peoples a log was thrown across a stream, or two vines or woven fibrous ropes (the
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.

drawbridge

At the entrance to fortifications, a bridge over the moat or ditch, hinged and provided with a raising and lowering mechanism so as to hinder or permit passage.
See also: Bridge

Drawbridge

 

a bridge with a movable span to permit the passage of ships. Drawbridges are usually built across rivers traveled by large ships when conditions make it technically and economically inadvisable to construct a bridge on high piers and with long approaches. The movable span of a drawbridge can be of the vertical-lift, swing, bascule, balance-beam, or rolling-lift type; the choice of type depends on local conditions. Construction of a drawbridge span requires either massive piers or towers to house the mechanisms and engines required for moving the span. Electric and hydraulic drives are the most common, and drawbridges are often equipped with backup drives from internal-combustion engines. The movable span generally has light-duty structural members, with trusses or beams of steel or lightweight alloys.

REFERENCE

Kryzhanovskii, V. I. Razvodnye mosty. Moscow, 1967.

drawbridge

[′drȯ‚brij]
(civil engineering)
Any bridge that can be raised, lowered, or drawn aside to provide clear passage for ships.

drawbridge

drawbridge
At the entrance of fortifications, a bridge over the moat or ditch, hinged and provided with a raising and lowering mechanism so as to hinder or permit passage.

drawbridge

a bridge that may be raised to prevent access or to enable vessels to pass
References in periodicals archive ?
This is definitely "Building Drawbridges for Tomorrow.
two bridge mode, more challenging task to handle two drawbridges at same time.
Kobke paints gatehouses and drawbridges of the Citadel a vast fortress built to defend Copenhagen's harbour with a hypnotic sense of time slowed to a snail's pace.
Crumbling cloisters and gargoyles Towers from whence poured blazing oils Battlements and parapets Ramparts and torture pits Monuments to medieval toils; Murky moats and drawbridges Solid iron portcullises The keep a sturdy stronghold A bastion of knights of old Monuments to Monarchs' avidities; Tumbling turrets and buttresses Powdering falling fortresses Echoes of the past Dynasties destined never to last Monuments to voracious vanities; Your walls tell tales of travesties Of torture and of anarchies Shrouded in mystery Days consigned to history Monuments to avarice.
It was fun to learn about catapults and drawbridges.
Over the last five years, private investors have spearheaded Harburg's renaissance among post-industrial archaeological remains, drawbridges, canals, warehouses and older half-timbered houses.
95) republishes the second revised edition of a 1983 classic survey of foot bridges, latticework and drawbridges alike.
This last leg takes you over two rusted drawbridges into Jersey City, taking a turn past my favorite carpet store where several mutilated statues of loggers stand outside.
That's getting close to the 25-nm limit at which the laws of quantum physics will allow electrons to leap across transistor drawbridges even when they're open.
Drawbridge (named for the railroad drawbridges over sloughs at both ends of the marshy island) got its start around 1880, when the South Pacific Coast Railroad stationed a bridge tender here.
They feature a continuum of universal images usually associated with protection--safe doors, drawbridges, rain hats, windbreakers, and even the peel of an orange and the lid of an eye.
We are planning the final stages of becoming a nonprofit entity, but at the same time we move forward in building drawbridges for tomorrow.