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 deep and about in diameter. The horizontal and vertical spacing between dots within a cell is approximately, while the distance between adjacent cells is about. 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
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.
History
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 Braille has such great advantages over the Moon system for regular usage that it quickly eclipsed the Moon system. Braille with its slate and stylus was unique in that it was the first and, until computers with screen readers, the only method a blind person could write and read themselves what had been written. 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 embossedroman 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" 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 blind nearly from birth, devised an Arithmetical slate. Braille evolved from the night writing of Charles Barbier. "Ecriture Nocturne" was invented in response to Napoleon's demand for a code that soldiers could use to communicate silently and without light at night. Because it used a cell with 2 columns of six dots each a total of 12 dots could be required for a single symbol, the cell was too large for a single touch and was hard to read and learn, it was not successful.
