Spanning the Centuries |
SeacoastNH.com Presents
Historic
No other photo from the archives seems more appropriate this week than this shot of the 1922
But the cutting edge technology of the 21st century bridge designed by Theodore P. Zoli III, as familiar as it may seem, is altogether different. It is the first truss bridge built without gusset plates connecting its major members and instead uses identical metal sections that are spliced together. It also introduces cold bending of steel to bridge construction, a submarine building technique pioneered by the U.S. Navy. How do I know all that? I stole the information right off the new Discover Portsmouth Web site (PortsmouthHistory.org). With uncanny timing the historical society visitor center (in the old library at the corner of Islington and Middle streets) features an exhibit entitled "Bridging the Piscataqua." Learn all about
BONUS CLOSE-UP OF TUG 1922