Illustrations
Experimental traces of the electrical "calcination" of an alloy, Martinus van Marum. Eerste vervolg der proefneemingen... Haarlem, 1787.
The Antikythera Mechanism. Schematic of the artefact's known mechanism. By Lead Holder [Public domain].
Georg Dionysius Ehret, 1708-1770, Salvia pratensis (1760s), watercolor on vellum. From Morgan Library & Museum, Drawings Online.
![Lead Holder [Public domain]](https://commons.wikimedia.org/wiki/File:Antikythera_mechanism.svg){kind=link}