The First Fax Machine: Alexander Bain's Chemical Telegraph. Pendulums, Electrochemistry, and the 1843 Quest to Transmit Images Over Telegraph Wires

Three decades before Alexander Graham Bell patented the telephone, and over a century before the modern office fax machine beeped into existence, a Scottish clockmaker named Alexander Bain was already transmitting rudimentary images over electrical wires. His 1843 patent for the "Chemical Telegraph" is one of the most astonishing, premature technological breakthroughs of the Victorian era. Bain's invention relied on perfect mechanical synchronization.
He used two heavy clock pendulums, one at the sending station and one at the receiving end, swinging in exact unison. At the receiving end, an electrical stylus swept across a piece of paper soaked in ammonium nitrate and potassium ferrocyanide. When an electrical pulse was transmitted, it triggered a chemical reaction, leaving a blue mark on the paper. By scanning line by line, Bain could successfully reproduce crude drawings and handwriting miles away. This deep dive into early telecommunications explores the genius of analog engineering.
It documents the intense rivalry between Bain and Samuel Morse, the struggle to maintain perfect pendulum synchronization over long distances, and the electrochemistry that allowed engineers to literally "burn" images into paper using electricity. The fax machine is older than the phone. The First Fax Machine reclaims the legacy of the brilliant clockmaker who realized that images, not just clicks, could be sent across a wire.