Brooklyn Bridge

Arguably the most influential bridge in American history, the Brooklyn Bridge remains one of New York City’s most celebrated architectural wonders. Designed by the brilliant engineer John Augustus Roebling (1806-1869) and completed by his equally ingenious son Washington Roebling (1837-1926), this elegant structure was, at the time of its completion in 1883, the longest suspension bridge in the world.

At the time the bridge was built, the aerodynamics of bridge building had not been worked out. Bridges were not tested in wind tunnels until the 1950s - well after the collapse of the Tacoma Narrows Bridge in the 1940s. It is therefore fortunate that the open truss structure supporting the deck is by its nature less subject to aerodynamic problems. Roebling designed a bridge and truss system that was six times as strong as he thought it needed to be. Because of this, the Brooklyn Bridge is still standing when many of the bridges built around the same time have vanished into history and have been replaced. This is also in spite of the nefarious substitution of inferior quality wire in the cabling supplied by the contractor J. Lloyd Haigh - by the time it was discovered, it was too late to replace the cabling that had already been constructed. Roebling determined that the poorer wire would leave the bridge four rather than six times as strong as necessary, so it was eventually allowed to stand.