The result was a congealed mass which he allowed to cool, then shattered with a hammer. And there were several small pellets of pure aluminum.

It was a remarkable discovery. But to carry it forward, Hall would need money. He found his financial backers in nearby Pittsburgh—a group of six industrialists led by Alfred E. Hunt.

These venturers formed the Pittsburgh Reduction Company and built a small plant in what is now Pittsburgh’s Strip District. On Thanksgiving Day, 1888, Hall and his first employee, Arthur Vining Davis, produced the first commercial aluminum using Hall’s technology.

Installed in 1884, the aluminum cap on the Washington Monument is still in service.