The electromagnetic telegraph, its most famous product the telegram and its  successor the tele-printer - are now all, essentially, extinct but their legacy lives on in the way we send emails and text messages, the stock “ticker” that runs across television business shows and the language of the digital world such as the baud rates of modems. The telegraph was the first medium to exploit electricity and from it developed the media of recorded sound and the telephone.  Author Tom Standage memorably dubbed it “The Victorian Internet.” The transmission of text messages from point to point without the physical carriage of paper has been a human goal since the days of the message drum, the smoke signal and the beacon fire.  The telegraph system combined electromagnetism and coding to revolutionise society, industry and warfare.