When the rail bridge over the River Forth in Scotland was opened in 1890, it was a landmark in civil engineering history. Today a highway bridge is being built adjacent to the old one, to replace present ferry facilities. The new suspension bridge promises to be a monument to just how far the material saving economies of prestressing can be carried. The anchorages for the bridge were tunneled 24- feet into bedrock, with steel tubes 4 and one-half inches in diameter inserted to act as ducts for the prestressing strands. In all 456 ducts were needed. Assemblies of four 1 and one-fourth inch diameter strands were threaded through each tube. Dead-end anchorage of the strands, above ground, is by means of massive zinc blocks enclosed within steel cylinders. The ends of the strands were enclosed within the zinc blocks at the plant before shipment. Below ground, live-end anchorage is provided by standard-type wedges. The total weight of prestressing strand used reached 630 tons. A similar method has been used to anchor the concrete foundations for the 505 foot high towers of the bridge. Each foundation was cast with holes for 48 single prestressing strands and the rock was drilled at each point to a depth of at least 35 feet. Strands 1 and one-fourth inches in diameter were then threaded down into the rock and pressure grouted. Each strand was tensioned at the surface, using wedge grips, and the duct within the foundation was grouted. A total load of 9,600 tons was applied to the base of each tower in this way.