The third in a series of reports to study the information transfer problems of the partially sighted. This report contains a detailed description of a double X-Y Platform, which can be used in conjunction with a closed circuit TV system for the partially sighted and substituted for the single X-Y Platform that has proved so useful in such systems. The double X-Y Platform permits the partially sighted to read printed and handwritten material and to comfortably copy from or take notes on what has been read. The platform's two rectangular working surfaces are designed to allow the user to change from reading to writing (or writing to reading) without having to search for the line where he left off. Other techniques were explored, and a series of experiments were performed with the cooperation of four partially sighted people using the different techniques. (See also R-1402, R-1537.)
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