21 cells, 9 lines. 10 cms. x 17 cms. A thick paper sheet of the same size as the slate should be inserted between the two leaves of the slate. Braille text in any language should then be embossed on the paper sheet, one letter in each cell of the slate using the stylus. It must be remembered that the embossing of text has to be from right to left starting from the right edge of the sheet, with the individual letter codes being embossed laterally inversed. This is necessary as the paper has to be turned over for the embossd matter to be read by touch.