Image: Tees (Newport) Bridge, Middlesbrough (geograph 7379398)
Description: The Tees (Newport) Bridge was designed by Mott, Hay and Anderson and built by local company Dorman Long, who have also been responsible for such structures as the Tyne Bridge and Sydney Harbour Bridge, it was the first large vertical-lift bridge in Britain. Constructed around twin 180 ft lifting towers, the 269 ft bridge span, weighing 2,700 tonnes, could be lifted by the use of two 325 H.P. electric motors at (52 ft) per minute to a maximum height of 121 ft. In the event of motor failure a standby 450 H.P. petrol engine could be employed to move the bridge, but should both systems fail it was possible to raise or lower the span manually using a winch mechanism. It was estimated in 1963 by Mr R. Batty, long time Bridge Master at Newport Bridge, that "it would take 12 men eight hours" to complete the movement by hand.
Author: Colin Park
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC-BY-SA-3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0/
Attribution Required?: Yes
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