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. Beneath the bellows are cupellation cakes of partially refined copper. From De la Pirotechnia (The Pirotechnia), by Vannoccio Biringucci, (Venice, 1540). (Photo by Ann Ronan Pictures/Print Collector/Getty Images)
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January 29th, 2021
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