Archive for the 'Instrument/Pointer' Category
Gilbert: An instrument*
Friday, May 13th, 2011
[ZB Magnet 2] William Gilbert, De Magnete (London: Petrus Short, 1600), Zentralbibliothek Zürich, Alte Drucke und Rara, XVI.28, p. 192.
Gilbert: Direction is not produced by attraction
Tuesday, May 10th, 2011
* [ZB Magnet 2] William Gilbert, De Magnete (London: Petrus Short, 1600), Zentralbibliothek Zürich, Alte Drucke und Rara, XVI.28, p.162.
Gilbert: Acquiring no property
Monday, May 9th, 2011
* [ZB Magnet 2] William Gilbert, De Magnete (London: Petrus Short, 1600), Zentralbibliothek Zürich, Alte Drucke und Rara, XVI.28, p.150.
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William Gilbert: Dip or Inclination
Wednesday, May 4th, 2011
Magnetic needles, pointers, rods or wire have a tendency toward the earth’ s centre, the so called magnetic dip or inclination. Inclination variers. Here a magnetic wire in a cork shows its dip in a bowl filled with water. [ZB Magnet 2] William Gilbert, De Magnete (London: Petrus Short, 1600), Zentralbibliothek Zürich, Alte Drucke und Rara, XVI.28, p. 203.
SPEEDI*
Tuesday, May 3rd, 2011
Barbara Ellmerer
*System for Prediction of Environmental Emergency Dose
SPEEDI, designed to predict the dispersal of radioactive materials based on forecasts by ERSS, is likely to have delayed the effective evacuation of residents in Fukushima Prefecture. The systems’ failure casts doubt on the government’s disaster-prevention policy, which said that the systems should be used to analyze and predict the amount and spread of radioactive material into the environment during a nuclear crisis.
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.
