<P> An early successful teleprinter was invented by Frederick G. Creed . In Glasgow he created his first keyboard perforator, which used compressed air to punch the holes . He also created a reperforator (receiving perforator) and a printer . The reperforator punched incoming Morse signals on to paper tape and the printer decoded this tape to produce alphanumeric characters on plain paper . This was the origin of the Creed High Speed Automatic Printing System, which could run at an unprecedented 200 words per minute . His system was adopted by the Daily Mail for daily transmission of the newspaper contents . </P> <P> By the 1930s teleprinters were being produced by Teletype in the US, Creed in Britain and Siemens in Germany . </P> <P> With the invention of the teletypewriter, telegraphic encoding became fully automated . Early teletypewriters used the ITA - 1 Baudot code, a five - bit code . This yielded only thirty - two codes, so it was over-defined into two "shifts", "letters" and "figures". An explicit, unshared shift code prefaced each set of letters and figures . </P> <P> By 1935, message routing was the last great barrier to full automation . Large telegraphy providers began to develop systems that used telephone - like rotary dialling to connect teletypewriters . These machines were called "Telex" (TELegraph EXchange). Telex machines first performed rotary - telephone - style pulse dialling for circuit switching, and then sent data by ITA2 . This "type A" Telex routing functionally automated message routing . </P>

Who developed a machine that allowed sound waves to travel across a wire as an electrical current