Gilbert: Magnetic Disagreements
Thursday, May 5th, 2011
But here we notice another curious fact … * [ZB Magnet 2] William Gilbert, De Magnete (London: Petrus Short, 1600), Zentralbibliothek Zürich, Alte Drucke und Rara, XVI.28, p. 133.
Archive for the 'Stone' Category
Magnetic Globe with Pointers
Tuesday, March 15th, 2011
A magnetic globe with pointers (versoria). Versoria are needles that give evidence to the lines of magnetic force of that globe. [ZB Magnet 2] William Gilbert, De Magnete (London: Petrus Short, 1600), Zentralbibliothek Zürich, Alte Drucke und Rara, XVI.28, p. 13.
Dividing a Magnetic Stone
Saturday, March 12th, 2011
1591. Giambattista Porta, Magiae Naturalis Libri Viginti (Here: Johannis Berthelin: 1650), Zentralbibliothek Zürich, Alte Drucke und Rara, ZB Z 153, p. 288.
A Stone Swimming on Water
Monday, March 7th, 2011
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.
