text: In Saxon settlements such as one identified in Northumberland as Bedes Ad Gefrin  (now called Yeavering) the buildings were shown by an excavators reconstruction to have opposed entries. In barns a draught created by the use of these opposed doorways was used in winnowing.
  The technique developed by the Chinese was not adopted in Europe until the 18th century when winnowing machines used a sail fan. The rotary winnowing fan was exported to Europe, brought there by Dutch sailors between 1700 and 1720. Apparently, they had obtained them from the Dutch settlement of Batavia in Java, Dutch East Indies. The Swedes imported some from south China at about the same time and Jesuits had taken several to France from China by 1720. Until the beginning of the 18th century, no rotary winnowing fans existed in the West.