linguistic:translation
Industry

At Sheffield the trade of cutler became divided, with allied trades such as razormaker, awl bladesmith, shearsmith and forkmaker emerging and becoming distinct trades by the 18th century.

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.