Home /

Scientific American 1920-08-21

ScientificAmerican1920-08-21.jpg Scientific American 1920-08-14ThumbnailsScientific American 1920-08-28Scientific American 1920-08-14ThumbnailsScientific American 1920-08-28Scientific American 1920-08-14ThumbnailsScientific American 1920-08-28Scientific American 1920-08-14ThumbnailsScientific American 1920-08-28

The largest of its kind, 350-ton crane at Philadelphia Navy Yard.