{"version":"1.0","provider_name":"OS Maps Discover","provider_url":"https:\/\/osmaps.com\/discover","title":"What is a trig pillar? | OS GetOutside","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"Jyiy8jEwkF\"><a href=\"https:\/\/osmaps.com\/discover\/guides\/what-is-a-trig-pillar\/\">What is a Trig Pillar or Trig Point ?<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/osmaps.com\/discover\/guides\/what-is-a-trig-pillar\/embed\/#?secret=Jyiy8jEwkF\" width=\"600\" height=\"338\" title=\"&#8220;What is a Trig Pillar or Trig Point ?&#8221; &#8212; OS Maps Discover\" data-secret=\"Jyiy8jEwkF\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script>\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\/\/# sourceURL=https:\/\/osmaps.com\/discover\/wp-includes\/js\/wp-embed.min.js\n<\/script>\n","thumbnail_url":"https:\/\/getoutside39507958bf.blob.core.windows.net\/blobgetoutside39507958bf\/discover\/wp-content\/uploads\/2024\/03\/trig-point-pillar-project-hero2.2459c66550e35ba20830f8037c980982.jpg","thumbnail_width":1920,"thumbnail_height":485,"description":"The trig pillar was first used in the retriangulation of Great Britain on 18 April 1936. With over 6500 built, they were vital in map making. Here's everything you need to know about trig pillars including 10 great trig point walks."}