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Charcoal burning, 1540. Building a pyramid of wood (right) to be covered with bracken and earth, then slowly burned (left) to produce charcoal
Using bellows to increase the draught in a furnace, 1540. Woodcut showing a workman using bellows to increase the draught in a furnace for refining copper
Blast furnaces, 1540. Woodcut showing different forms of blast furnace, with bellows supplying draught powered by an overshot water wheel
