H. Grindell-Matthews, inventor of a method of controlling motorboats at sea by wireless, for which the British Government awarded him $125,000, has perfected a principle by which airplane or other engines can be stopped in full operation through an invisible ray. He has demonstrated its efficacy with but a quarter kilowatt of power on engines in the laboratory, and needs only to strengthen its current for operation at a greater distance to bring airplanes in flight to a full stop and send them crashing to earth. No insulation is proof against this weapon,...
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