Furnaces for making bras at Ochran in the Tyrol, 1734.

Engraving from 'Regnum Subterraneum sive Minerale de Cupro et Orichalco' (The Subterranean or Mineral Kingdom in respect to Copper and Bras) 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.