Closeup of the Drac bridge, showing stabilizing cables. Preparations for swinging the bridge today take 30 minutes, and a full revolution of the bridge takes around six minutes. Gate-swing bridge - see Puente de la Mujer. When a water vessel needs to pass the bridge, road traffic is stopped usually by traffic signals and barriersand then motors rotate the bridge horizontally about its pivot point. A simple suspension footbridge in the Zillertal Alps. The Mathematical Papers of Isaac Newton:
Since that occasion it is estimated that the bridge has swung nearlytimes to allow vessels to pass through.
Simple suspension bridge
Simple suspension bridges, for use by pedestrians and livestock, are still constructed, based on the ancient Inca rope bridge but using wire rope and sometimes steel or aluminum grid decking, rather than wood. The mechanism used to swing the bridge is kept in working order by its custodians the Port of Tyne and is still the same machinery originally installed by Sir W G Armstrong. Archived from the original on 16 January Disadvantages connected with simple suspension bridges are very great. Northumbria Police Knife-wielding burglar threatened couple in their home before making off with cigarettes and alcohol. News all Most Read Most Recent Newcastle Crown Court Pervert caught by paedophile hunters months after he walked free for having sex with a child Mathew Huckle got a suspended prison sentence last March but within months he was engaging in illicit online chat with what he thought were schoolgirls. A view of hanging bridge from ThenmalaKollam.