Spinning wheel in China,
Song Dynasty (the date is unknown)
For more than three thousand years everybody used a drop spindle to spin fibers into cloth. But in the Middle Ages the people of the Islamic Empire were making a lot of money growing cotton and selling cotton cloth, and the people of China were making a lot of money selling silk. It was hard for the slave spinning women to keep up - they couldn't make cloth fast enough. You could buy more women to spin, but then the cloth became too expensive. Scientists went to work on the problem, and by 1237 AD (or maybe a little earlier) they had invented a machine that could spin four times as fast as a drop spindle - a spinning wheel. Nobody knows whether Chinese or Islamic scientists got there first.
Thanks to the travelling traders of the Silk Road, it didn't take long to spread the word about the new invention. Soon women all over Europe and Asia were making their lives easier - and clothing cheaper - with the spinning wheel.