ScientificAmerican1917-03-17.jpg Scientific American 1917-03-10ThumbnailsScientific American 1917-03-24Scientific American 1917-03-10ThumbnailsScientific American 1917-03-24Scientific American 1917-03-10ThumbnailsScientific American 1917-03-24Scientific American 1917-03-10ThumbnailsScientific American 1917-03-24Scientific American 1917-03-10ThumbnailsScientific American 1917-03-24

Industrial Number. Cleaning out the small-casting furnace. In lower front are what look like four molds for metal casting.