Originally published in January 1898
“The remarkable process of crushing and magnetic separation of iron ore at Mr. Thomas Edison’s works in New Jersey shows a characteristic originality and freedom from the trammels of tradition. The rocks of iron ore are fed through 70-ton ‘giant rolls’ that can seize a 5-ton rock and crunch it with less show of effort than a dog in crunching a bone. After passing through several rollers and mesh screens, the finely crushed material falls in a thin sheet in front of a series of magnets, which deflect the magnetic particles containing iron. This is the latest and most radical development in mining and metallurgy of iron.”
—Scientific American, January 1898
More gems from Scientific American’s first 175 years can be found on our anniversary archive page.
