ScientificAmerican1919-02-15.jpg Scientific American 1919-02-08 interior photoThumbnailsScientific American 1919-03-15Scientific American 1919-02-08 interior photoThumbnailsScientific American 1919-03-15Scientific American 1919-02-08 interior photoThumbnailsScientific American 1919-03-15Scientific American 1919-02-08 interior photoThumbnailsScientific American 1919-03-15

A lift bridge equipped with numerous novel safety devices.