TON KINSBERGEN / SCIENCE PHOTO LIBRARY TON KINSBERGEN / SCIENCE PHOTO LIBRARY
Braille typewriter. Braille keyboard for an old typewriter. The sliding pointer (lower centre) is adjusted to select the desired letter, number, or punctuation mark. The raised braille dots enable a blind person to identify the character selected. Here, the letter 'l' has been selected, shown by a vertical line of three dots. Elsewhere on the typewriter is a key that is struck to print the letter selected. Braille was invented by Louis Braille (1809-1852). The first typewriters were built in the 1870s.
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