Cathode Ray Tubes
https://moores-glass.co.uk/wp-content/uploads/2018/06/Hollow-Cathode.jpg 300 300 mattd mattd https://secure.gravatar.com/avatar/be75d89bfb8491ae87288e61f506a979e28e1c4e964aa107258a5af3f2ce2087?s=96&d=mm&r=gWe have to credit the discovery of glass for giving us many useful things. Our ability to manipulate raw materials to suit our needs started in ancient history with the fashioning of rocks to make spears and arrowheads. Later we used bronze and then iron tools, eventually evolving to transform iron into steel and seeing…