This significantly improved writing speed with the slate and stylus, which wrote one dot at a time, but lost its advantage with the braille typewriters that became practical after 1950.
12.
The factory in an industrial complex outside Cape Town produces 90 braille typewriters a week for use in Africa and other parts of the developing world, and forms part of a wider campaign to advance literacy among the blind.
13.
Certain unusual forms of keyboarding require multiple keys to be pressed or held down simultaneously; for example, Braille2000 keying requires as many as six keys to be pressed at once analogous to the six dot keys of a Braille typewriter.
14.
The "'Perkins Brailler "'is a " braille typewriter " with a key corresponding to each of the six dots of the braille code, a space key, a backspace key, and a line space key.
