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When the World's first long tubular bridge structure was built by Stephenson, the sections were floated into place and then lifted using hydraulic rams (http://menaibridges.co.uk/history/britannia-bridge/britannia-bridge-questions/). One failed and this section of the failed ram is still sitting near the bridge on its plinth although nothing explains what it is. To give an idea of the forces involved, the metal must be about 10 inches thick where it failed. It must have been a spectacular explosion. M9 c/w 35mm pre-aspheric Summilux.

 

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Thank you for the info.  This was the forerunner of an over-highway bridge that was put in place by much newer means recently in the US, and which failed not long after its installation

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