More Inventions (II)

Typewriter 

The typewriter is an instrument for the production of printed letters by manual operation. Sholes invented the first practical commercial typewriter in the U.S. in ,1873, and it was manufactured by the gunsmith Philo Remington in 1874. It only worked with capital letters; a shift-key model appeared in 1878 and it was widely used in 1935. The electric typewriter came into operation in the 1960s. The type levers were replaced with type-surfaced metal ball that moves rapidly across a stationary paper holder; the metal ball was later replaced by a daisy wheel. Data was stored and reproduced automatically by Computerised typewriters .They can also function as a personal computer printer. Nowadays typewriters have been replaced by word processors or by computers using word processing programs.