Biography.

Georgius Agricola authored what is considered the first book on physical geology, the first textbook on mineralogy, and one of the most comprehensive treatises on every aspect of metallurgy and mining ever published.

Henry Bessemer invented embossed stamps, a method of embossing velvet with elaborate patterns, a machine for pressing sugar cane, a mortar shell, and more. But he is best known for inventing a better method of converting iron to steel, a method that has now been in use for over 150 years.