Bain's Chemical Telegraph: Writing by Electricity Alexander Bain's 1843 telegraph wrote its own messages: signal current darkening chemical paper as it passed. This guide covers the clockmaker's recording telegraph and his years in the Morse patent wars. Quick facts Inventor Alexander Bain Patented 1843 Paper chemical, ferrocyanide Mark electrochemical stain Later idea facsimile scanner Bain spent his genius in courtrooms, but his recording principle quietly outlived the quarrels. The autographic telegraphs of the railway age - and the fax machine after them - are Bain's chemical paper, mechanised. Start now: https://morsecodeworks.com/ Morse Code Works - free Morse code tools and guides. Reference chart