page_title: Astatic needles
hierarchical_section_title: Astatic needles
caption_attribution_description: English: ArtistT. GourjonAuthorLeopoldo NobiliDescription English: Astatic galvanometer, Nobili pattern. Italiano: Galvanometro astatico di tipo Nobili. Date1840Mediumbrass, glass, steelDimensionsheight 235 mm, diameter 160 mmCurrent location (Inventory)Museo Galileo&#160;&#160;Native nameMuseo GalileoLocationFlorenceCoordinates43°&#160;46′&#160;04″&#160;N, 11°&#160;15′&#160;21″&#160;E&#160; &#160;Established1930Websitewww.museogalileo.itAuthority control VIAF: 139974525 LCCN: no2010157919 WorldCat Room XVIAccession number1417Place of creationParisSource/PhotographerOwn work This file was provided to Wikimedia Commons by Museo Galileo as part of a GLAM-WIKI project with Wikimedia Italia. This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing for more information. italiano&#160;| English&#160;| +/− English: Astatic galvanometer, Nobili pattern. Italiano: Galvanometro astatico di tipo Nobili.
context_page_description: An astatic system comprises two equal and parallel magnetic needles, but with their polarities reversed. This arrangement protects the system from the influence of the terrestrial magnetic field, as the magnetisms of the two needles cancel each other out. Because of this phenomenon, astatic needles were often used in galvanometers.
context_section_description: An astatic system comprises two equal and parallel magnetic needles, but with their polarities reversed. This arrangement protects the system from the influence of the terrestrial magnetic field, as the magnetisms of the two needles cancel each other out. Because of this phenomenon, astatic needles were often used in galvanometers.
caption: Astatic galvanometer, Nobili pattern at the Museo Galileo, Florence.
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