ScientificAmerican1920-02-28.jpg Scientific American 1920-02-21ThumbnailsScientific American 1920-03-13Scientific American 1920-02-21ThumbnailsScientific American 1920-03-13Scientific American 1920-02-21ThumbnailsScientific American 1920-03-13Scientific American 1920-02-21ThumbnailsScientific American 1920-03-13

"A machine that eats its way through the heaviest snows" for snow removal on city streets and roads.