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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Kinsbergen, Ton |
Bildgröße: | 5549 px × 3637 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |