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 ?
Teaching about drawbridges allows students to apply skills they have learned in math and science, while also being creative with design and the use of available materials.
I personally welcome you to "Building Drawbridges for Tomorrow," 76th Anniversary of the Virginia Association for Health, Physical Education, Recreation, and Dance Convention.
The keys gave access to the Tower's drawbridges as well as conference rooms and a restaurant, according to the Historic Royal Palaces, which runs the site.
To do that, you will have to raise or lower drawbridges and, if necessary, shoot arrows at the attackers.
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. We see them in Lord of the Rings movies, but I never knew how they worked," said one of Allen's students.
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.
Richard Sanders Allen's Covered Bridges Of The Northeast (0486436624, $9.95) republishes the second revised edition of a 1983 classic survey of foot bridges, latticework and drawbridges alike.
The idea may conjure images of medieval drawbridges, but these high-tech gates won't protect citizens from foreign invaders.
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." Michael Ashkin's idea of a picturesque road trip may be a little closer to Tony Soprano's than most people's, but at least you could say, based on this extract from a 2001.
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.