Wednesday, June 22nd, 2011
Barbara Ellmerer
Archive for the 'Deviation' Category
Gilbert: Dealing with Obliquity and Anomaly
Tuesday, June 21st, 2011
[ZB Magnet 2] William Gilbert, De Magnete (London: Petrus Short, 1600), Zentralbibliothek Zürich, Alte Drucke und Rara, p. 238-39 (Translation, p. 356-57) *
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A magnetized pointer in a round piece of cork dips and deviates in a water bowl
Friday, May 27th, 2011
[ZB Magnet 2] William Gilbert, De Magnete (London: Petrus Short, 1600), Zentralbibliothek Zürich, Alte Drucke und Rara, p. 203.
William Gilbert: Deviation
Monday, May 2nd, 2011
Long loadstone with versoria. Versoria deviate according to the distance from the middle or equator of the loadstone (CD). The deviations are greater the greater the distance of the versoria is from the equator. [ZB Magnet 2] William Gilbert, De Magnete (London: Petrus Short, 1600), Zentralbibliothek Zürich, Alte Drucke und Rara, XVI.28, p. 164.
William Gilbert: Terrella with a weak part which is marked with cross-lines.
Thursday, April 28th, 2011
[ZB Magnet 2] William Gilbert, De Magnete (London: Petrus Short, 1600), Zentralbibliothek Zürich, Alte Drucke und Rara, XVI.28, p. 155.
AB is a terrella imperfect in parts and of unequal power on the circumference. The needles H and L vary, because they are placed in a decayed part and incline towards the sound parts (where the needles C, D, E, F are placed). Needle O does not deviate because it is placed in the middle of the decayed part.
