A drawbridge is a form of bridge normally made from hefty timber or some other type of wood. Typically, the is built over a moat or a ditch. The can conveniently be raised or lower in order to let civilization pass through. In years past, a drawbridge was increased in bespeak to store the foe away. In this case, they were usually provided to protect castle gates.
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In the beforehand years, there were three types to pick from. The classic drawbridge contained a sliding platform that could pull earlier and forth. This additionally featured a increased bridge, which was operated by chains and also attached to the corners. It additionally included a bridge with articles that pointed upwards and also had hanging chains.
A bascule drawbridge and a lift drawbridge are two various other options. The bascule kind utilizes a counterweight and enables boats to happen through. It to be officially developed in the 1850s after engineers tweaked the original drawbridge design. The an initial was created in Saint Petersburg, Neva.
The most renowned drawbridge in the world is the Tower Bridge, which runs throughout the river Thames in London. In ~ first, the Tower bridge was activate by heavy steam powered from coal-burning boilers. Today, oil and electricity strength the Tower Bridge.
A elevator drawbridge is commonly called a vertical background drawbridge. It it s okay this name due to the fact that it rises vertically, though still remaining in a parallel place with the deck. It rises with the help of counterweights, which must weigh an ext than what is to it is in lifted. This kind is built from steel and is generally used come lift automobiles and also trucks. The is likewise used because that light and also heavy rail work.
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The vertical lift is much less expensive to construct then the bascule type. The just disadvantage of a elevator drawbridge is height restriction. Because the height is restricted, the passageway hoist used with the bridge is typically far over the platform base.
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anon239031 January 6, 2012
Who developed the drawbridge? What is the background of a drawbridge? What simple machines are in the drawbridge? anon69984 march 11, 2010 how to do a basic drawbridge for a institution project? anon54863 December 2, 2009 who created the attract bridge and also where? anon8771 February 20, 2008 why is drawbridge used? for whom go it provided for? write-up your comments
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