What workshop machine did Leonardo da Vinci design to make uniform threads for textiles?

Leonardo da Vinci designed a spinning machine intended to make textile threads more uniform.

Spinning turns loose fibres such as wool or flax into yarn by drawing them out and twisting them. Leonardo studied and sketched mechanical devices that could automate parts of this process. His designs used rotating components to improve consistency and reduce the physical effort required from workers.

The machines belonged to Leonardo's wider interest in manufacturing technology. He observed existing workshops closely and tried to translate skilled hand operations into repeatable mechanical movements. This approach connected art, engineering, and the expanding textile economy of Renaissance Italy.

Leonardo's spinning designs were proposals rather than mass-produced industrial machines. They also should not be confused with the spinning jenny, which was patented by James Hargreaves in eighteenth-century Britain. Leonardo's contribution was an early mechanical attempt to automate yarn production, not the invention of modern factory spinning.