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THREE-DIMENSIONAL MOTION PICTURES In the year 1865, Clerke Maxwell expressed the electro magnetic theory of light, based upon the relation he discovered to exist between the specific induction capacity of the dielectrics (non-conductors of electricity) and the influence that these substances have on the velocity of light traveling through them. Clerke Maxwell tended to prove that the medium in which luminous and electrical actions are transmitted, is the same, and that there is an impulsive power, or motion as well as energy in the light waves. The velocity of light in air was calculated by him by purely electrical means and he gave the result as 299,300 kilometers per second as compared with the mean of 299,800 kilometers obtained by direct observation. This remarkable result led Maxwell to state that light is an electromagnetic wave and, although he succeeded in calculat ing the pressure exerted by the momentum of the light waves, he could not prove the existence of the electromagnetic waves. His reasoning was purely mathematical and as no phenomena could be explained by the electromagnetic theory that could not be explained by the undulatory theory the former was little considered until Hertz, from 1888 to 1892, proved that mag netic intensities are propagated at a measurable and thus finite velocity and succeeded in producing and giving proof of the existence of electromagnetic waves. Since Hertz disclosures, the electromagnetic theory obtained great favor in the scientific world, but as the undulatory theory can still be used in treating of the phenomena of light that are of interest to the readers of this work and in a more intelligible way, as it avoids the mathematical calculations involved in the Maxwell theory, we will not depart from it. LIGHT WAVES The acceptance of the undulatory theory involves the exist ence of waves, propagating the energy emitted by the luminous body.