{"version":"1.0","provider_name":"Universe of Instrumentation","provider_url":"http:\/\/www.edisontc.org\/ui","author_name":"admin","author_url":"http:\/\/www.edisontc.org\/ui\/author\/admin\/","title":"Electrostatic Voltmeters and Field Meters - Universe of Instrumentation","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"2VYZEaObvz\"><a href=\"http:\/\/www.edisontc.org\/ui\/home\/course\/unit-i\/electrostatic-voltmeters-and-field-meters\/\">Electrostatic Voltmeters and Field Meters<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"http:\/\/www.edisontc.org\/ui\/home\/course\/unit-i\/electrostatic-voltmeters-and-field-meters\/embed\/#?secret=2VYZEaObvz\" width=\"600\" height=\"338\" title=\"&#8220;Electrostatic Voltmeters and Field Meters&#8221; &#8212; Universe of Instrumentation\" data-secret=\"2VYZEaObvz\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script type=\"text\/javascript\">\n\/* <![CDATA[ *\/\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/* ]]> *\/\n<\/script>\n","thumbnail_url":"http:\/\/www.edisontc.org\/ui\/files\/2016\/02\/Unit1Banner900-1a.jpg","thumbnail_width":800,"thumbnail_height":254,"description":"This type of meter was developed in the 1880s and was an alternative to magnetic coil meters. The idea is that we can charge two plates which become attracted to one another when in proximity or direct contact to high voltage. If we place a spring or weight to keep the plates apart by default &hellip; Continue reading"}