Galvanometer

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<div class="fotopedia_widget_dark_unframed" id="fotopedia_widget" style="width: 400px"><script src="http://www.fotopedia.com/wiki/Galvanometer/widget?widget_skin=dark_unframed&widget_width=400" type="text/javascript"> </script><p><a href="http://www.fotopedia.com/wiki/Galvanometer">Galvanometer</a> on <a href="http://www.fotopedia.com">Fotopedia</a></p></div>