Chorded keyboard (a writing system for the blind) uses either 6 or 8 tactile 'points' from which all letters and numbers are formed. When Louis Braille invented it, it was produced with a needle holing successively all needed points in a cardboard sheet. In 1892, Frank Haven Hall, superintendent of the Illinois Institute for the Education of the Blind, created the Hall Braille Writer, which was like a typewriter with 6 keys, one for each dot in a braille cell. The Perkins Brailler, first manufactured in 1951, uses a 6-key chord keyboard (plus a spacebar) to produce braille output, and has been
National Federation of the Blind these students can read print effectively; some are multiply impaired and cannot learn to read at all; but the NFB believes that many more than the six percent of the blind children currently learning to read Braille could be taught to read if parents and educators were committed to doing so. An even smaller percentage of adults losing vision are encouraged to learn Braille. The NFB maintains that these adults are functionally illiterate when they are no longer able to read print effectively and Braille instruction has not been made available to them. Some graduates of NFB rehabilitation programs report