GEORGE BERNARD / SCIENCE PHOTO LIBRARY GEORGE BERNARD / SCIENCE PHOTO LIBRARY
Assayer at work. Assaying is the analysis of metal ores to determine the proportions of their components. Pieces of the equipment are labelled. Engraving taken from The Laws of Art and Nature, in Knowing, Judging, Assaying, Fining, Refining and Inlarging the Bodies of Confin'd Metals (1683) John Pettus, a translation of the work of Lazarus Erckern.
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