File:Galvanomètre de Nobili.jpg
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editDescriptionGalvanomètre de Nobili.jpg |
Français : Illustration d'un galvanomètre de Nobili
English: Woodcut of an astatic galvanometer from a 1904 physics book. The astatic galvanometer, invented by Leopoldo Nobili in 1825, is a historical instrument that measures electric current. It consists of two magnetized needles, suspended from their centers by a long thin fiber which can turn freely. One needle is inside a coil of wire. When electric current passes through the coil, its magnetic field causes the needle to turn from its equilibrium position perpendicular to the coil to be parallel to the coil's axis. The second needle (visible), located above the coil and magnetized in the opposite direction, serves to cancel out the effect of the Earth's magnetic field (that's what the "astatic" means), and also serve as a pointer to indicate tne magnitude of the current. |
Date | |
Source | Leçons de Physique ; Éditions Vuibert et Nony |
Author | Gillard |
Permission (Reusing this file) |
"avec l'aimable autorisation des Éditions Vuibert" |
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer.
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This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. |
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
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current | 05:02, 21 April 2012 | ![]() | 858 × 1,246 (322 KB) | Materialscientist (talk | contribs) | crop whitespace, tweak levels |
10:13, 9 September 2007 | ![]() | 990 × 1,267 (395 KB) | Caristo 2~commonswiki (talk | contribs) | {{Information |Description=Illustration d'un galvanomètre de Nobili |Source=Leçons de Physique ; Éditions Vuibert et Nony |Date=1904 |Author=Gillard |Permission="avec l'aimable autorisation des Éditions Vuibert" |other_versions= }} |
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