National Geographic : 1933 Apr
Photograph byA.W. Cutler THE "BROOKLYN BRIDGE" OF THE SEVERN Built in 1779, this span was the first iron bridge of any size. As the manipulation of cast iron was then in itsinfancy, abridge of such dimensions was a bold undertaking. It gave its name to the modern town of Iron Bridge. The span of the arch is 100 feet;the width, 20feet (see text, page 432).