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Computer graphics for the blind

Recent experience at Vitro Laboratories points to automated Braille graphics as an effective analytical tool for blind persons. The writer has developed a generalized system in which plot commands are captured on a "Macro tape". The plot thus defined can be placed on a pen plotter, electrostatic printer, CRT or line-printer without reprogramming. An option to the line-printer module allows lines to be displayed with dots and symbols to be displayed in Braille. An elastic strap, which fits on any printer, causes the dots to be raised. With automatic rescaling and scissoring the plots can be blown up to any size. This system is being regularly used to make plots of engineering data for a blind engineer at Vitro, with extensive savings in analysis time. Maps, mathematical curves, block diagrams, and perspective plots have also been generated which show great potential for educational purposes.