The SLATE AND STYLUS are tools used by blind persons to write text
that they can read without assistance. Invented by Charles Barbier
as the tool for writing night writing , the slate and stylus allow
for a quick, easy, convenient and constant method of making embossed
* 1 Design * 2 Writing * 3 History * 4 Gallery * 5 Notes * 6 References * 7 External links
The basic design of the slate consists of two pieces of metal, plastic or wood fastened together with a hinge at one side.
The back part of the slate is solid with slight depressions spaced in braille cells of six dots each. The depressions are approximately .75 mm (0.030 in) deep and about 1.5 mm (0.059 in) in diameter. The horizontal and vertical spacing between dots within a cell is approximately 2.5 mm (0.098 in), while the distance between adjacent cells is about 4 mm (0.16 in).
The front of the slate consists of rectangular windows that fit over the braille cells in the back. The inner rim of each window is provided with six indentations, which assist the user to position the stylus properly and press to form a dot.
There are pins or posts in the back of the slate positioned in non-cell areas to hold the paper in place and keep the top properly positioned over the back. The pins align with matching depressions on the opposite side of the slate. A slate as designed for a normal 8.5 inch piece of paper has 28 cells in each row. The rows can be any number, usually at least four.
The stylus is a short blunted awl with a handle to fit comfortably the hand of the user.
Writing is accomplished by placing a piece of heavy paper in the slate, aligning it correctly and closing the slate. The pins in the back of the slate puncture or pinch the paper securely between the two halves of the slate.
The person writing begins in the upper right, each combination of dots in the cell has to be completed backward. The awl is positioned and pressed to form a depression in the paper. The writer moves to one of the other dots in the cell or to the next cell as appropriate.
The slate is repositioned as needed to continue writing on the paper. When completed the writer removes the slate and turns the paper over to read the braille by feeling the dots that were pushed up from the back.
Prior to the system devised by Louis Braille, a number of other
methods for blind people to read and/or write on paper were used. One
of the most popular was the English system of Dr. William Moon
invented in 1845. The English/Moon system or
Moon type is easy to
learn for the newly blind as it has a strong resemblance to the
familiar written alphabet, but
The earliest systematic attempt to provide a method to "teach the blind to read and to write, and give them books printed by themselves" was by Valentin Haüy who used a system of embossed roman characters . In June 1784, Haüy sought his first pupil at the church of Saint-Germain-des-Prés . On 5 December 1786, Haüy's pupils had embossed from movable letterpress type his "Essai sur l\'éducation des aveugles " (Essay on the Education of Blind Children) the first book ever published for the blind. Prior to 1786 tools for the blind to read or write were the results of individuals personal approaches to solutions. One of the more notable approach was that of Nicholas Saunderson ( Lucasian Professor of Mathematics at Cambridge ) blind nearly from birth, devised an Arithmetical slate.
* ^ _A_ _B_ _C_ Alpha Chi Omega (1908)
* ^ Shrady, et al.(1902)
* ^ Note: Different references assign invention of the slate and
stylus to either Barbier or Braille. However,
* Alpha Chi Omega (1908). _The Lyre of Alpha Chi Omega; Teaching the blind_. Original from the New York Public Library: Alpha Chi Omega. p. 285. * Dodge, Mary Mapes Dodge (1920). _St. Nicholas; Chapter XI, the nine gifts_. Original from the University of Michigan: Scribner & Co. p. 910. * Perkins School for the Blind (1907). _Report_. Original from Harvard University: Perkins School for the Blind. p. 69. * Shrady; George Frederick Shrady; Thomas Lathrop Stedman; Joseph Meredith Toner; et al. (1902). _Medical Record_. Original from Harvard University: W. Wood. p. 621. * Harry Houdini Collection (1888). _The Popular Science Monthly; Writing machines for the blind_. Original from the New York Public Library: D. Appleton. p. 645. * Oregon Education Department (1897). _Biennial Report_. Original from the New York Public Librar