The stirrup arrives in Europe from China in the early 8th century. The heavy plow is in use in the Rhineland in the early 8th century. The horse collar first appears in Europe. The use of soap , a Gaulish invention, spreads through Europe. Iron becomes common in western Europe.
Paper is introduced into the Arab world.
The first description of a rotary grindstone occurs in 834. The whippletree for the tandem hitching of horses to a wagon comes into general use in the 11th century. The use of hops in brewing beer spread between the 10th Century and the 14th. The horizontal loom appears in Europe in the 11th century, and in mechanized form in the 12th century. Percussion drilling was first used in 1126 by the Carthusian monks.