ScientificAmerican1887-12-24.jpg Scientific American 1887-12-17ThumbnailsScientific American 1887-12-31Scientific American 1887-12-17ThumbnailsScientific American 1887-12-31Scientific American 1887-12-17ThumbnailsScientific American 1887-12-31Scientific American 1887-12-17ThumbnailsScientific American 1887-12-31Scientific American 1887-12-17ThumbnailsScientific American 1887-12-31

The United States Testing Machine at the Watertown Arsenal.