Bridges presentation
were separated by an 18ft (6m) stiffening truss. In addition, the truss was braced with radiating cable
stays inclined from the tops of the suspension towers and anchoring cables tying the deck to the
sides of the gorge, arresting any tendency to lift under gusts of wind. For the four main cables,
Roebling used parallel wires laid up in place but, instead of individual strands like the "garland"
system preferred by the French, he bunched the strands together in a single large cable and wrapped
them with wire, a technique he patented in 1841 but one that Vicat had illustrated in 1831 in his
Rapport sur les ponts en fil de fer sur le Rhône.
Few bridges in the world built since the Brooklyn Bridge in New York (USA) can stand entirely
clear of its shadow. Completed in 1883, the plan involved two distinctive stone towers, four main
cables, anchorages, diagonal stay cables, and four stiffening trusses separating the common roadway
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