
When we build that wooden storage shed in the backyard we use nails and screws. The projects we build in the shed will probably incorporate nails and screws somewhere and we most likely could not build without them. One of the first metal objects forged by man is nails. They were generally a square shape and forged individually from iron. The head of the earliest nails was just a bent over "L" shape or moulded into a four sided pyramid shape. Nails made in this fashion were extremely expensive to produce and were used very sparingly. In the 16th century the invention of the first wa...








