Diagram of the bridge over the Conwy (previously known as Conway) near Betws-y-Coed in North Wales. The arch was constructed in the same year the Battle of Waterloo was fought (1815). Also shown are a cros-section through the centre of the bridge with details of roadway plates, ribs and buckling plates. Illustration from Thomas Telford's (1757-1834) 'Atlas to the Life of Thomas Telford, civil engineer', published in London in 1838.
© Science Museum / Science & Society Picture Library