ScientificAmerican1917-08-18.jpg Scientific American 1893-05-13ThumbnailsScientific American 1921-06-25Scientific American 1893-05-13ThumbnailsScientific American 1921-06-25Scientific American 1893-05-13ThumbnailsScientific American 1921-06-25Scientific American 1893-05-13ThumbnailsScientific American 1921-06-25Scientific American 1893-05-13ThumbnailsScientific American 1921-06-25
Using a car pusher in place of a switching engine in an industrial plant.