Sheffield is famous for making cutlery (like knives and spoons). People in Sheffield have made cutlery for a very long time (a Sheffield-made knife is referred to in Chaucer's "Canterbury Tales", a book from the Middle Ages). Sheffield is also famous for making steel. Benjamin Huntsman discovered the crucible technique for making steel in 1740. In 1856, Henry Bessemer invented the Bessemer converter steelmaking furnace. Henry moved to Sheffield to make steel. Later, in 1912, Harry Brearley invented stainless steel in Sheffield.