Nikola Tesla one of the world's foremost scientists, who celebrated his 78th birthday by telling of his wall of force 'all invisible screen male of death rays, through which nothing can pass.' The wall 'which is to be a seam of terrifically concentrated energy, will annihilate airplanes, armies, navies, or anything that comes into its path.' He is reserving technical details for the peace conference in Geneva. He believes it is a powerful factor for peace in as much as it is a purely defensive mechanism. Dr. Tesla is listed in the world of science as the discoverer of wireless transmission of the induction motor and the cosmic ray.