This lamp was so constructed so as to place a piece of matter such as carbon, or a diamond or a ruby, in the center, and bombard this “button” with electrical energy that would bounce off the button onto the inside of the globe and bounce back onto the button. If this were a ruby, and Tesla specifically worked with rubies, then is exactly how a ruby laser is created. Tesla refers in INVENTIONS to a “pencil-thin” line of light that was created with this device. It is my belief that Tesla not only invented the ruby laser in 1893, but he also demonstrated it and published it’s results. The problem with the device was that it was set up so as to “vaporize,” or destroy, the button, so that the laser effects were probably short-lived.