A dead key is a special kind of modifier key on a mechanical typewriter, or computer keyboard, that is typically used to attach a specific diacritic to a base letter. The dead key does not generate a (complete) character by itself, but modifies the character generated by the key struck immediately after. Thus, a dedicated key is not needed for each possible combination of a diacritic and a letter, but rather only one dead key for each diacritic is needed, in addition to the normal base letter keys.
Spanish typewriter (QWERTY keyboard) with dead keys for acute, circumflex, diaeresis and grave accents.
A typewriter is a mechanical or electromechanical machine for typing characters. Typically, a typewriter has an array of keys, and each one causes a different single character to be produced on paper by striking an inked ribbon selectively against the paper with a type element. At the end of the nineteenth century, the term 'typewriter' was also applied to a person who used such a device.
Mechanical desktop typewriters, such as this Underwood Typewriter, were long-time standards in government agencies, newsrooms, and offices.
Peter Mitterhofer's typewriter prototype (1864)
The 1969 Olivetti Valentine typewriter, featured in the permanent collections of the Metropolitan Museum of Art, Museum of Modern Art, and Cooper Hewitt, Smithsonian Design Museum in New York; London's Design Museum and Victoria and Albert Museum.
An Elliott-Fisher book typewriter on display at the Historic Archive and Museum of Mining in Pachuca, Mexico