Engraving showing metalworkers heating, hammering and shaping iron. The waterwheel powers rollers used to flatten the metal into sheets. from 'Regnum subterraneum sive minerale de ferro' (The Subterranean or Mineral Kingdom in respect to Iron) by Emanuel Swedenborg (1688-1772) published in Dresden in 1734. This book formed part of his 'Opera philosophica et mineralia' (Philosophical and Logical Works), which dealt with the creation of the world, and drew on Swedenborg's interpretations of metallurgy and metaphysics.
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