materials for a rapidly developing modern world.
It is a fascinating reminder that some of the most important pieces of industrial history were never famous. They simply did their jobs, day after day, until their usefulness came to an end.
A Steel Ball Built for Heavy Work
Large steel grinding balls were used in ball mills, enormous rotating machines designed to crush and grind material.
Inside these mills, the heavy balls would tumble together with the material being processed. As the mill rotated, the balls repeatedly collided with the raw
