James Hargreaves invented the spinning jenny in 1764, a multi-spindle spinning frame that was one of the key developments in the industrialization of textile manufacturing. Before the jenny, a spinner could only work one spindle at a time; Hargreaves' machine allowed a single worker to spin eight or more threads at once. This drastically increased the productivity of the textile industry. However, the invention also sparked fear among traditional hand-spinners, who worried the machine would steal their jobs. In a precursor to the Luddite movement, a mob of angry workers broke into Hargreaves' house and destroyed his machines. Despite the resistance, the spinning jenny laid the groundwork for the transition from 'cottage industries' (working from home) to the large-scale factory system.