Radar May Assist The Blind
A small box, weighing about nine pounds, may prove to be the first of the many and even better aids to blind people now being developed. One now manufactured which can be carried in a small case, is connected to an earphone. By turning the case the blind man receives signals through the earphones which are reflected light beams changed into sound by a photo-electric cell. With practice it is possible to sort out signals. Two dashes give notice of an object at eight feet; at nine feet the signal received is a dash and two dots. In this way objects up to twenty feet can be “seen.”
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https://paperspast.natlib.govt.nz/newspapers/BPB19490207.2.40
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Bay of Plenty Beacon, Volume 13, Issue 50, 7 February 1949, Page 7
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113Radar May Assist The Blind Bay of Plenty Beacon, Volume 13, Issue 50, 7 February 1949, Page 7
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