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Cantilevered Drawbridge



A simple, but unusual and elegant design: a bridge in the city of Leeuwarden in the Netherlands uses two arms to swing a section of road in and out of place. It's called the "Slauerhoffbrug" and was built in 2000.

Image Gallery and Aerial View via The Presurfer | Photo: Frozenly

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Larfin - oh, it's nothing particularly clever, particularly when you know how to do it.

Early arches were semicircular. Later arches introduced pointed arches made from two circle segments leant against each other to give long tall windows. Finally, for bridges, someone realised that you don't have to have a semicircular arch - which makes the bridge too high for people to easily cross without expensive ramps leading up to it, but that you can flatten the arch to leap a far wider span without the height penalty.
Most stonework river bridges are elliptical arches.
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