Keywords: Otto von Guericke portrait 1672.jpg de Porträt des Otto von Guericke Kupferstich Experimenta Nova ut vocantur Magdeburgica de Vacuo Spatio Amsterdam 1672 “ http //digital slub-dresden de/id276647807 SLUB Dresden ca 1672 author PD-art-100 PD-1923 Otto von Guericke 1670s engravings 17th-century engraved oval portraits of men at bust length |