COMMUNICATION BY LIGHT RAYS
GERMAN AND JAPANESE SYSTEM
(Rec. 8.30 p.m.) NEW YORK, May 7. The Office of Scientific Research and Development has released a report disclosing that the Germans and the Japanese developed a system of short range telephonic communication enabling combat troops to converse by means of invisible rays of infra red light. The instruments resembled small searchlights mounted on tripods and provided maximum secrecy because the signals were difficult to detect and also were free from static and skip distance phenomena.
The instrument changed the voice frequencies into light pulses which were beamed to a phpto-sensitive receiver where a telephone head set reconverted the pulses to sound. The German field set had a range of 10 miles and the Japanese set a range of two miles, but both required good weather and Considerable skill. The report added that widespread use of the system in peace time would require far more efficient sets than could be procured in large quantities.
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Bibliographic details
Press, Volume LXXXII, Issue 24870, 9 May 1946, Page 5
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162COMMUNICATION BY LIGHT RAYS Press, Volume LXXXII, Issue 24870, 9 May 1946, Page 5
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