1.0High Voltage Experimentshttps://www.extremeelectronics.co.uk/hvexperimentsEEadminhttps://www.extremeelectronics.co.uk/hvexperiments/author/eeadmin/rich600338<blockquote class="wp-embedded-content" data-secret="fc966YRCRz"><a href="https://www.extremeelectronics.co.uk/hvexperiments/lichtenberg-figures-wood/">Lichtenberg figures – Wood</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://www.extremeelectronics.co.uk/hvexperiments/lichtenberg-figures-wood/embed/#?secret=fc966YRCRz" width="600" height="338" title="“Lichtenberg figures – Wood” — High Voltage Experiments" data-secret="fc966YRCRz" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript"> /* <![CDATA[ */ /*! This file is auto-generated */ !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); /* ]]> */ </script> Equipment High voltage AC supply (NST) Two self tapping Screws Piece of wood (MDF is good) Cloth and a bowl of water   Diagram Method Screw in the two screws around 100mm apart. Using the water and cloth dampen the wood between the screws. Attach the HV power supply to the screws. Turn on the power a Lichtenberg figure will slowly be burnt into the wood. If the burning stops, remove the power and re-dampen the wood. Resultshttp://www.extremeelectronics.co.uk/hvexperiments/wp-content/uploads/2013/05/lichtenburg-wood-300x175.jpg