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| View Original: | Astatic Galvanometer brass and ivory.jpg (709x831) | |||
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| Keywords: Astatic Galvanometer brass and ivory.jpg en wikipedia 2011 January 21 astatic galvanometer showing the coils and the magnetic needle the lower needle is inside the coils An 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 2010-12-20 Own <br />Transferred from http //en wikipedia org en wikipedia Williamgelbart at http //en wikipedia org en wikipedia cc-zero Williamgelbart at http //en wikipedia org en wikipedia Original upload log page en wikipedia Astatic_Galvanometer_brass_and_ivory jpg 2010-12-20 02 00 Williamgelbart 709×831 201682 bytes <nowiki>Astatic galvanometer showing the coils and the magnetic needle the lower needle is inside the coils </nowiki> Astatic galvanometers | ||||
