The Moon alphabet is easier to learn than Braille, particularly for people who lose their sight in later life. The letters of the Moon alphabet can represent individual sounds, parts of words, whole words or numbers.

He conceived the basic idea of an electromagnetic telegraph in 1832, and produced the first working telegraph set in 1836. This made transmission possible over any distance.

can easily converse at 20 to 30 words per minute

Morse Code can be transmitted using sound or light

It was invented by Louis Braille (1809-1852), a French teacher of the blind. It consists of patterns of raised dots arranged in cells of up to six dots in a 3 x 2 configuration.

Each cell represents a letter, numeral or punctuation mark.

Grade 3, which is used only in personal letters, diaries, and notes. It is a kind of shorthand, with entire words shortened to a few letters.

these contractions can be used medially but never at the beginning of a word

B for but P for people C for canQ for quite D for doR for rather E for everyS for some F for fromT for that G for goU for under H for haveV for very J for justW for was K for knowX for it L for likeY for you M for moreWh for which N for notCh for child

AB for about LL for little AF for afterLR for letter AG for againSD for said CD for couldSHD for should GD for goodWD for would NEC for necessaryYR for your

Born on January 4, 1809, Coupvray, France, Braille was accidentally blinded in one eye at the age of three. Within two years, a disease in his other eye left him completely blind.

Captain Charles Barbier invented sonography, or nightwriting, a system of embossed symbols used by soldiers to communicate silently at night on the battlefield. Inspired by a lecture Barbier gave at the Institute a few years later, the fifteen-year-old Braille adapted Barbier's system to replace Haüy's awkward embossed type, which he and his classmates had been obliged to learn.

In his initial study, Braille had experimented with geometric shapes cut from leather as well as with nails and tacks hammered into boards. He finally settled on a fingertip-sized six-dot code, based on the twenty-five letters of the alphabet, which could be recognized with a single contact of one digit. By varying the number and placement of dots, he coded letters, punctuation, numbers, diphthongs, familiar words, scientific symbols, mathematical and musical notation, and capitalization. With the right hand, the reader touched individual dots and, with the left, moved on toward the next line, comprehending as smoothly and rapidly as sighted readers. Using the Braille system, students were also able to take notes and write themes by punching dots into paper with a pointed stylus which was aligned with a metal guide.

Teachers at the Royal Institute taught French Sign Language (FSL). In 1816, an American educator of the deaf, Thomas Gallaudet (1787-1851), returned to the United States after studying the French techniques at the Royal Institute.

ASL is not the only form of sign language. Fingerspelling is one method in which hand-shapes (representing letters) are used to spell out each word of the English language while speaking. It is an unpopular method of communication and is tiring to use and interpret.

short mark, dot or 'dit' (·) — one unit long longer mark, dash or 'dah' (–) — three units long intra-character gap (between the dots and dashes within a character) — one unit long short gap (between letters) — three units long medium gap (between words) — seven units long[10]