Braille
Significant progress in the education of the blind came when in 1826 Louis Braille (1809-1852), blind teacher, organist, and former pupil at the Paris institution, invented the system that now bears his name. Utilizing the "night writing" principle of Charles Barber, a captain in the French cavalry, who used a combination of 12 embossed dots, Braille developed his own system, in which letters of the alphabet were represented by various combinations of embossed dots in cells not more than two dots wide by three dots high. The letters are formed by the use of all possible combinations of six dots.
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