According to Mark Elvin, 14th-century Chinese technical manuals describe an automatic water-powered spinning wheel. Comparable devices were not developed in Europe until the 18th century. However, it fell into disuse when fibre production shifted from hemp to cotton. It was forgotten by the 17th century. The decline of the automatic spinning wheel in China is an important part of Elvin's high level equilibrium trap theory to explain why there was no indigenous industrial Revolution in China despite its high levels of wealth and scientific knowledge.