In the early nineteenth century, weaving complex patterns into silk was a slow and expensive process. Each thread had to be raised or lowered by hand, and a single mistake could ruin weeks of work. Only the wealthiest clients could afford fabrics with elaborate figures of flowers, birds or historical scenes. This situation changed in 1804, when a French weaver named Joseph-Marie Jacquard unveiled a loom that could reproduce almost any pattern automatically.
Jacquard's key innovation was a chain of stiff cards, each pierced with a different arrangement of holes. As the cards passed through the loom, metal rods either slipped through a hole or were blocked by the card, and in this way the machine decided which threads to raise for every row of the pattern. A weaver who once needed an assistant and days of preparation could now switch designs simply by replacing the chain of cards.
The reaction from Lyon's silk workers was hostile. Many feared that the new loom would destroy their livelihoods, and there were riots in which several machines were smashed. Yet the economic advantages proved impossible to ignore. Within two decades, thousands of Jacquard looms were in operation across Europe, and the price of patterned fabric fell sharply.
The deeper legacy of the loom, however, lay outside the textile industry. The idea that holes punched in a card could instruct a machine inspired Charles Babbage, and later the designers of early computers, who used punched cards to store programs and data well into the twentieth century. A device built to weave silk had quietly become the ancestor of modern computing.