Illustration depicting diving operations after the Tay Bridge Disaster. Designed by the engineer Thomas Bouch (1822-1890) and completed in 1878, the Tay Bridge was just under two miles in length and was considered the longest bridge in the world. However, it proved to be unstable against wind loadings. On 28 December 1879, as the Edinburgh to Dundee train was crosing the bridge during a strong gale, the structure collapsed, killing all 75 pasengers on board.
© Science Museum / Science & Society Picture Library