"tsarskoye" - 1 õppematerjal

Bridges presentation

arch, however, merits mention, as it is the oldest iron bridge in America. Dunlaps Creek Bridge (1839), designed by Captain Richard Delafield of the Army Corps of Engineers for the National Road in Brownsville, Pennsylvania, survives to this day, still carrying traffic (Figure 7). Because the material could be moulded into elaborate shapes, extravagantly decorative iron arches were used for pedestrian bridges on the grounds of estates and imperial palaces, such as Catherine the Great's Tsarskoye Selo in St Petersburg (Russia), or urban pleasure grounds, such as Central Park in New York City (USA). Both places have remarkable collections of cast-iron arch bridges. Figure 8 Royal Albert Bridge, Saltash, Cornwall (UK), was the last great enterprise of Isambard Kingdom Brunel, England's foremost Victorian engineer. This photograph served as the frontispiece to William Humber's A Complete Treatise on Cast and Wrought Iron Bridge Construction, published in 1864, and