SPEECH BY INFRA-RED LIGHT
Jress Assn.
By Telegraph
-Copyrlght
Received Wednesday 7.0 p.m. * NEjW YORK, May 7. The office of Scientific Resedrch and u Development has released a report disclosing that the Germans and Japanese developed a system of short range felephonic cdmmiinication enahling comhat troops to converse hy means of the invisible rays of infrared light, The instruments resemhled small searchlights mounted on tripods and provided the maximum of secrecy hecause the signals were difficult to detect and also free from static and skip distance phenomena. The instrument changed voice frequencies into light pulses which were heamed to a photo«sensitive receiver where a telephone headset reconverted 'the pulses to sound. The German field set had a range of ten miles and the Japanese set two miles, hut hoth required good weather and considerahle skill.
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https://paperspast.natlib.govt.nz/newspapers/CHRONL19460509.2.33
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Chronicle (Levin), 9 May 1946, Page 5
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135SPEECH BY INFRA-RED LIGHT Chronicle (Levin), 9 May 1946, Page 5
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