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Animation showing the operation of a drawbridge. A drawbridge or draw-bridge is a type of moveable bridge typically at the entrance to a castle or tower surrounded by a moat.In some forms of English, including American English, the word drawbridge commonly refers to all types of moveable bridges, such as bascule bridges, vertical-lift bridges and swing bridges, but this article concerns the ...
Drawbridges listed on the U.S. National Register of Historic Places. In American English, the term drawbridge refers to any type of movable/moveable bridge. This category includes both functioning drawbridges and ones whose draw span is no longer able to open.
The Sparkill Creek Drawbridge is a historic Pratt Pony Truss drawbridge located at Piermont in Rockland County, New York. It was built in 1880 by the King Iron Bridge Company of Cleveland, Ohio, and is a single-leaf movable metal bridge. Chains can lift the bridge when an operator turns a crank, helped by counterweights.
In American English, the term is synonymous with drawbridge, and the latter is the common term, but drawbridge can be limited to the narrower, historical definition used in some other forms of English, in which drawbridge refers to only a specific type of moveable bridge often found in castles.
A bascule bridge (also referred to as a drawbridge or a lifting bridge) is a moveable bridge with a counterweight that continuously balances a span, or leaf, throughout its upward swing to provide clearance for boat traffic. It may be single- or double-leafed.
The following movable bridges (drawbridges and swing bridges) exist in the U.S. state of Florida. ... This page was last edited on 2 March 2024, at 02:48 (UTC).
A double-beam drawbridge, seesaw or folding bridge is a movable bridge . It opens by rotation about a horizontal axis parallel to the water. Historically, the double-beam drawbridge has emerged from the drawbridge. A (double-beam) drawbridge has counterweights, so that operating requires less energy compared with such a bridge without ...
The Cortland Street Drawbridge (originally known as the Clybourn Place drawbridge) [4] over the Chicago River is the original Chicago-style fixed-trunnion bascule bridge, designed by John Ericson and Edward Wilmann. [3] When it opened in 1902, on Chicago's north side, it was the first such bridge built in the United States.