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Buy the "Great Projects" videos and companion book at ShopPBS. |
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Seemingly Lighter than Air When the time came to construct the deck, Ammann did without the stiffening trusses that made other bridges unsightly. Instead he used plate girders built into the underside of the roadway, a kind of horizontal truss that added little to the deck's thickness. Thus, the deck that emerged over the Hudson River was only twelve-feet deep. From any distance it appeared to float. |
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  How engineers contained and controlled the Colorado and Mississippi rivers. Thomas Edison lights up New York City; Sam Insull brings power to Chicago; and TVA electrifies rural America Constructing the George Washington Bridge Putting a major highway under Boston  |
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