Teaser

 

http://www.historycooperative.org/journals/sia/32.2/guise.html a very nice page on truss bridges; the evolution of the Warren truss, showing several works by our old friend Albert Fink.
http://pghbridges.com/basics.htm simple drawings and explanations of the whole bridge thing, for those with a little bit of interest or in need of a quick refresher.
http://bridgehunter.com/ny/broome/ouaquaga/ the other lenticular bridge linked to in the extended text section.

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