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The Forth Bridge - 141 story backlabel

In the late 1800s, a railway bridge across Scotland's Firth of Tay swayed and collapsed in the wind. Seventy-five passengers and crew on a passing night train died in the crash. It was the worst bridge disaster in history. So when engineers proposed bridging the even wider Firth of Forth, the Scottish public demanded a structure that looked like it could never fall down. They got it.

Click photo for larger image. Chief engineers Sir John Fowler and Benjamin Baker came up with the perfect structural solution: a cantilever bridge. The Firth of Forth Bridge is made of a pair of cantilever arms, or beams "sticking out" from two main towers. The beams are supported by diagonal steel tubes projecting from the top and bottom of the towers. These well-secured spans actually support the central span. This design makes the Firth of Forth Bridge one of the strongest -- and most expensive -- ever built.

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