Dryburgh Abbey Bridge
Dryburgh Abbey Bridge was a cable-stayed footbridge of significant historical interest erected near Dryburgh Abbey, in the Borders of Scotland. It connected the villages of Dryburgh and St. Boswells (part of a ribbon of settlements, including Newtown St. Boswells), across the River Tweed. A crossing had existed here for centuries, originally with a ferry service. The bridge had been commissioned by David Stewart Erskine, 11th Earl of Buchan, an eccentric Scottish aristocrat who later died in Dryburgh. It was long. At the time, the cable-stayed type of bridge was undergoing a period of rapid growth  in popularity. The Earl opened the completed bridge on 1 August 1817, but in January 1818 it collapsed. One of the designers Thomas Smith described the collapse due to "high wind increasing to perfect hurricane, it carried off chain bridge, leaving only the fastenings and supports, the work of half a year, demolished in an hour..." After a redesign, a replacement was built, but this too collapsed in 1838, by which time the Earl had been dead for several years. The 1818 collapse, together with that of a slightly shorter bridge across the Saale River in Germany in 1824, caused  the reputation of cable-stayed bridges to decline rapidly, and despite a history dating back to the 17th century, the design was almost completely abandoned for over a century, with suspended-deck suspension bridges gaining favour. Later research in the 1930s, and experience with reconstruction after the Second World War, demonstrated that with sound design, cable-stayed bridges are not without their advantages, and the first modern design, the Strömsund Bridge in Sweden, was completed in 1955. Very shortly after the 1818 collapse (between 1819 and 1820) another bridge, the Union Bridge, was built some downstream. It was an iron  suspended-deck suspension bridge, the longest in the world upon its completion. A third Dryburgh Suspension Bridge was built in 1872 to replace the 1838 loss.