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 Library for the Blind (United States) returned to the library to be proof read, corrected, shellacked, eyeleted, and bound by the blind employees, under the oversight of the director. The library sent out catalogues, both in printed ink and embossed type, the latter enabling the blind themselves to select books they wished to read. A book of instructions and a slate and stylus were sent to those desiring to learn to transcribe in English Braille. National Library for the Blind (United States) The National Library for the Blind was an American philanthropic and educational institution. The National Library for the Blind was incorporated December 26, 1911,