Chorded keyboard (a writing system for the blind) uses either 6 or 8 tactile 'points' from which all letters and numbers are formed. When Louis Braille invented it, it was produced with a needle holing successively all needed points in a cardboard sheet. In 1892, Frank Haven Hall, superintendent of the Illinois Institute for the Education of the Blind, created the Hall Braille Writer, which was like a typewriter with 6 keys, one for each dot in a braille cell. The Perkins Brailler, first manufactured in 1951, uses a 6-key chord keyboard (plus a spacebar) to produce braille output, and has been
History of the Cherokee language sorcery. After completing the lessons, Sequoyah wrote a dictated letter to each student, and read a dictated response. This test convinced the western Cherokee that he had created a practical writing system. When Sequoyah returned east, he brought a sealed envelope containing a written speech from one of the Arkansas Cherokee leaders. By reading this speech, he convinced the eastern Cherokee also to learn the system, after which it spread rapidly. In 1825 the Cherokee Nation officially adopted the writing system. From 1828 to 1834, American missionaries assisted the Cherokee in using Sequoyah's syllabary to develop type characters and print