LANGUAGE FOR BLIND

BRAILLE...

Braille method of printing books for the blind based on a system of raised dots on paper engraved by hand or machine to be read by touch. Each letter, number or punctuation is defined by the number and location of the six possible points of each group (a group having two points three points wide and high). The Braille alphabet also can write and read music. The dots are recorded by the back of the paper in reverse, to be read by the front of the same in the normal reading direction. Blind Braille can be written on a blackboard with a style or using a Perkins (similar to a typewriter) machine.

It is based on a symbol consisting of 6 points: those that are embossed represent a letter or sign the writing on visual characters. Importantly, it is not a language but a code. Therefore, properties and syntax are the same as for visual characters. 

The size and distribution of the 6 points that make the call sign generator, is not a fad but the fruit of the experience of Louis Braille. The nerve endings in the fingertip are trained to capture this particular size. 

  But this sign allows only 64 combinations of points, being insufficient for the whole range of letters, symbols and numbers in each language. This limitation will require the invention of so-called "double symbols", to be discussed later. Attempt to use a braille symbol 8 points (which would significantly increase the number of possible combinations), but was uncomfortable for reading and forced to march finger each symbol to understand what they meant.