They allow a person who is hearing impaired to amplify the incoming conversation. A braille computer terminal is one that can be interfaced with existing on-site or remote information processing systems. When connected to computers or data banks, they can deliver brailled pages of information at a rate of up to 100 words per minute. Students can request information on a standard keyboard and obtain a brailled response in a matter of seconds. Most of the legally blind population does not read braille.
Braille is extremely bulky and requires a great deal of storage space.
The Perkins Brailler is an all-purpose braille writer enclosed in a baked grey enamel aluminum case. It is operated by six keys. There are spacing, line advancing, and back spacing keys. Extention keys are available which allow the user to emboss the full braille cell by one stroke of either hand leaving the other hand free to read brailled material which is being copied. Theatrical, short subject, documentary, training and educational films for adults are available.