Charcoal burning, 1540. A pit being filled with wood (right), covered with earth and bracken, then slowly burned to produce charcoal. Charcoal produced by this method is inferior to charcoal burned in heaps. From De la Pirotechnia by the Italian metallurgist Vannoccio Biringuccio (1480-1539). (Venice, 1540). (Photo by Ann Ronan Pictures/Print Collector/Getty Images)
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January 28th, 2021
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