Gear Technology Magazine
www.geartechnology.com/articles/20290-chicago-s-movable-bridges

Chicago's Movable Bridges

September 1, 2007
Chicago has been known as many things over the years—“Hog Butcher to the World,” “The City That Works,” “The Windy City” and “The City of Big Shoulders” among them. Although perhaps lesser known, add “City of Bridges” to the list.