A magnet placed in a vessel moves the vessel towards north. This movement can be changed by another magnet. Drawing in the translation of Peregrinus’ letter made by Filippo Pigafetta (1533-1604), manuscript: Vienna, Österreichische Nationalbibliothek, published by Sturlese*, p. 50.

* Petrus Peregrinus Epistula de magnete (a cura di Loris Sturlese). In: Opera/Petrus Peregrinus de Maricourt. Pisa: Scuola Normale Superiore, 1995.

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