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How does a castle drawbridge work?
Classical, medieval drawbridges worked via the simple principle of counterweight, with large wood and metal bridges pivoted via a series of balancing weights in a castle’s gatehouse. By employing counterweights, incredibly heavy bridges could be operated by just a few people – useful when under attack.
How does a draw bridge work?
A drawbridge is a structure across a body of water with moveable parts that can be lifted, rotated, or swung to allow traffic to pass through the waterway on which it sits. Drawbridges are built so that a section of the bridge deck, the surface on which vehicles drive across, can move.
How was a drawbridge used to defend a castle?
Drawbridge. A drawbridge was a bridge which could be pulled up to stop enemies getting in. Drawbridges usually went over a ditch or a moat. The drawbridge at Threave Castle near Castle Douglas (above) went over a moat flooded with water from the River Dee.
Who opens a drawbridge?
A tall mast sailboat approaches the drawbridge. The captain of the boat will do one of two things to request the opening of a drawbridge: A. Radio call-up via marine VHF Channel 9.
Why did castles have a drawbridge?
The Drawbridge was needed so that inhabitants of a medieval castle could easily get in and out of the castle, however the main purpose of the Drawbridge was that it provided a way to stop enemies attacking the castle and prevented siege weapons being pushed towards the castles walls and gates.
What is the advantage of a draw bridge?
Advantages: You can have free passage of any height when the drawbridge is up regardless of the level the road is on. You can always close a drawbridge (by cutting the chains used to draw the bridge up)
How does a retractable bridge work?
Retractable bridges are made so the movable span slides back underneath an adjacent section of the bridge. Swing bridges are supported on vertical pivots, and the movable span rotates horizontally to open the bridge.
Did Stone keep castles have a drawbridge?
The entire castle might be surrounded by a ditch or moat and entrance to the castle was by drawbridge. Foremost for the castle’s defense was its keep, a fortified tower built within the castles, used as a refuge of last resort if the castle fell to an enemy.
How would you defend a Motte and Bailey castle?
Fire was the best way to attack the early Motte and Bailey castles since they were made entirely of wood. The fire might be started by building a bonfire against the outer wooden fence (palisade) or, more usually, by archers shooting fire-arrows into the castle.
How did medieval drawbridges work?
Classical, medieval drawbridges worked via the simple principle of counterweight, with large wood and metal bridges pivoted via a series of balancing weights in a castle’s gatehouse.
What materials are used to make a draw bridge?
Raw Materials Draw bridges are made primarily from concrete and steel. Seventy-five hundred short tons (6,804 metric tons) of structural steel and 150,000 short tons (13,6080 metric tons) of concrete were used in the Casco Bay Bridge A typical draw bridge.
How do bascule bridges raise and lower?
In double-leaf or four-leaf (a double-leaf bridge with separate leaves for each direction of vehicular traffic) bascule bridges, each leaf can be raised and lowered independently.
How did ancient bridges lift heavy objects?
The weights, which were attached to the bridge’s lifting chains, enabled the platform to be raised via a windlass, which in turn rotated a pair of lifting drums that gathered in the chains. By employing counterweights, incredibly heavy bridges could be operated by just a few people – useful when under attack.