KIRCHER, ATHANASIUS. Magnes, sive de arte magnetica. Cologne: Jodocum Kalcoven, 1643. Engraved additional title and 28 engraved plates (2 with volvelles), and numerous woodcut diagrams and illustrations in text. Small 4to, contemporary calf, spine gilt, each cover with initials "TW" gilt-stamped in center, joints and spine cracked; some browning and light staining. Second edition. NLM/Krivatsy 6399; see Norman 1215 ("The second edition of this work [Cologne, 1643] had a great influence on Otto von Guericke"). Rare.