Charcoal burning: Building pyramid of wood (right)

Charcoal burning: Building pyramid of wood (right) to be covered with bracken and earth, then slowly burned (left) to produce charcoal. Superior to charcoal produced in pits. From Biringuccio De la Pirotechnia Venice 1540. Woodcut

1540 Biringuccio Bracken Burned Charcoal Pirotechnia Pits Produce Pyramid Slowly Superior

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