Water powered forge. Water wheel (at right) powering a hammer (at lower centre) and bellows (at centre left) in a forge. The wheel is connected to the hammer and bellows by a crank system. This mechanism lifts the hammer and allows it to fall under its own weight onto a sheet of metal which a worker has placed on an anvil. Image taken from Kunstliche Abriss allerhand Wasser- Wind- Ross- und Handt Mullen (1617) by J. de Strada.