Dr. Tesla Tells About Force Ray

New York, July 11 (AP) — The discovery of a force ray that would destroy an army 100 miles away, that would make a nation's defense impregnable, has been announced by the inventor, Dr. Nikola Tesla. In the interests of peace, Dr. Tesla said he plans to place the ray at the disposal of the Geneva Disarmament Conference. He announced the invention yesterday, on the occasion of his 78th birthday. The force ray, Dr. Tesla said, would consist of particles, driven electrically and projected in vast curtains, miles high and 100 miles long. The speed of the particles — traveling velocities of 50,000,000 volts — was described by him as giving the ray its destructive powers. He said projecting plants, set up every 200 miles along a border, each shooting rays 100 miles on each side, would make the border impenetrable. A fleet of 10,000 airplanes, flying into such a curtain, he said, would be destroyed. Dr. Tesla gave only a general description of the apparatus, asserting that the force ray involved scientific advances hitherto scarcely conceived. Dr. Tesla has been a pioneer in high frequency transmission and a noted inventor, with 100 patents to his credit.