1849 Illustration, showing The Britannia tubular bridge

1849 Illustration, showing The Britannia tubular bridge: launching the main tube. The tube was floated to the base of the masonry piers, and then lifted into place. Begun by Robert Stephenson in 1846, the bridge was opened on 18 March 1850

1846 Begun Caernarvon Floated Launching Lifted Masonry Menai Piers Stephenson Straits Tubular

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