Before Einstien came along an disproved the theory, the 'Law of Conservation of Matter and Energy' held true in the world of physics. E=mc2 defined the concept that radiant energy can become matter and vise versa. thus our atomic age was born. In 'Occult Ether Physics', William Lyne states that "rotating tubes of force" were spoken about by Faraday and Maxwell and known to Tesla, and that they had been discussed in 1881, by J.J. Thomson in England also. "Tesla realized that the rotatory force of magnetic fields could be used to synthesize the rotating "tubes of force", the naturally occuring phenomena in all solid bodies. Lyne further explains how "low frequency electromagentic waves can pass through solid bodies and tend to "hug the earth" while high frequency waves don't penetrate solid bodies, causing a "skin effect" on them and don't "hug the earth", but tend rather to travel outward away from the earth in straight lines".- Per Teslas investigation of the Schumann Cavity at Colorado Springs.