A REMARKABLE INVENTION
VOICE ON BEAMS OF LIGHT. The British Adimiraitiy has approved of an iniyention by Dr. A. Rankine, of University College, X»on.don, of electrical instruments Ihich transmit and receive the natural voice along beams of light, as for example, (the searchlight and the heliograph ray. . The instrumerLts have 'been successfully .'tested over a distance of over a mile and a half. Dr. Rankine says it is easy to greatly enlarge the range. He considers that 'the inve<nltioii will 'be specially useful to vessels, enabling them to communicate with the shore. Person^ on land' or sea can. speak to persons in aircraft high in the air. The invention, Dr. Rankine says, should prove of great service in gunny countries. It has the advantage of secrecy, as sound waves cannot be "tapped."
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Thames Star, Volume LII, Issue 13936, 15 July 1919, Page 4
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132A REMARKABLE INVENTION Thames Star, Volume LII, Issue 13936, 15 July 1919, Page 4
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