Creative Cutlery

Before the mid 19th century when cheap mild steel became available due to new methods of steelmaking, knives (and other edged tools) were made by welding a strip of steel on to the piece of iron that was to be formed into a knife, or sandwiching a strip of steel between two pieces of iron. This was done because steel was then a much more expensive commodity than iron. Modern blades are sometimes laminated, but for a different reason. Since the hardest steel is brittle, a layer of hard steel may be laid between two layers of a milder, less brittle steel, for a blade that keeps a sharp edge well, and is less likely to break in service.
After fabrication, the knife had to be sharpened, originally on a grindstone, but from the late medieval period in a blade mill or (as they were known in the Sheffield region) a cutlers wheel.