Sunday, March 13th, 2011
Archive for 2011
Sticks Help to Find the Poles of a Magnetic Stone that’s Round Like a Globe
Sunday, March 13th, 2011
After 1558? Drawing in the translation of Peregrinus’ letter made by Filippo Pigafetta (1533-1604), manuscript: Vienna, Österreichische Nationalbibliothek, published by Sturlese*, p. 94.
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.
Measuring the World – Preparing for a shot
Thursday, March 10th, 2011
Instruments for shaping the view and preparing for target setting. Sebastian Münster, Rudimenta mathematica (Basel: Henricus Petri, 1551), Zentralbibliothek Zürich, Alte Drucke und Rara, T 131, Title.
Measuring – Stars, Buildings, Cannonballs III
Wednesday, March 9th, 2011
How to relate the angle of a cannon to the height of the destination of the cannonball. Sebastian Münster, Rudimenta mathematica (Basel: Henricus Petri, 1551), Zentralbibliothek Zürich, Alte Drucke und Rara, T 131, p. 29.
Measuring – Stars, Buildings, Cannonballs II
Wednesday, March 9th, 2011
Measuring the height of a tower with a quadrant. Sebastian Münster, Rudimenta mathematica (Basel: Henricus Petri, 1551), Zentralbibliothek Zürich, Alte Drucke und Rara, T 131, p. 6.