The devining rods used in mines during the 16th century. Georg Agricola, 'De Re Metallia' 1571.

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Photo credit: © Charles Walker Collection / Alamy / Afripics
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Keywords: 1571., 16th, agricola, archival, archive, art, artistic, artwork, book, century., de, devining, earth, esoterica, forces, georg, historic, historical, history, illustration, image, metallia, mines, mono, paranormal, rods