Assayer at work
Assayer at work. Assaying is the analysis of metal ores to determine the proportions of their components. Pieces of the equipment are labelled. 2 are the scales used to weigh components. 3 are the cases for holding the weights. 4 are containers of acid solutions, such as aqua fortis (nitric acid) and aqua regis (mixture of nitric and hydrochloric acids), and quicksilver (mercury). 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.
© George Bernard/Science Photo Library
Uraniborg, Tycho's observatory on the island of Hven, Denmark, centre. Bottom
Uraniborg, Tycho's observatory on the island of Hven, Denmark, centre. Bottom left is the Emperor Ferdinand I's villa at Prague whereTycho made observations during 1600 and 1601. Tycho Brahe (Tyge Ottesen Brahe - 1546-1601) Danish astronomer, astrologer and alchemist who built astronomical instruments which enabled him to make the most accurate observations of his time. Engraving from Historia Coelestis by Tycho Brahe, 1666.
© Universal History Archive/Universal Images Group
NOVA REPERTA, c1600. Frontispiece engraving by Theodor Galle (c1570-1633) from 'Nova Reperta' (New Discoveries) by Jan van der Straet, Antwerp, late 16th century
NOVA REPERTA, c1600. Frontispiece engraving by Theodor Galle (c1570-1633) from 'Nova Reperta' (New Discoveries) by Jan van der Straet, Antwerp, late 16th century.
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