European Post Mill

Timeline

1. c. 1180–1220England and Normandy · NormandyThe origin of the European windmill remains disputed: mainstream scholarship holds that it developed natively, independent of the Persian windmill (vertical-axis type), with the 12th-century Crusades possibly bringing back ideas for improvement, but the horizontal-axis blade design of the European post mill is fundamentally different from the vertical-axis windmills of the Islamic world. In 1185, documents from Wheldrake in Yorkshire, England recorded the definite existence of a post mill. Contemporary records from Normandy (1180) and Flanders also exist, showing that this technology appeared almost simultaneously in northwestern Europe and was quickly used for grinding grain.
2. c. 1220–1500Low Countries, Northern Germany, Baltic coast · Northern EuropeBetween the 13th and 15th centuries, post mills spread rapidly along the North Sea and Baltic coasts. Craftsmen improved the post foundation (from a single post to a four-legged trestle with braces) and installed manually adjustable sail blades on the mill house. Craftsmen in the Low Countries also used them to pump water from low-lying coastal areas, combining them with sluice gates to form early polder systems. By the late 14th century, more stable tower mills began to appear along the Dutch coast, but the post mill, easy to build and cheap, remained the main choice for inland grinding.
3. 1511–1520Low Countries, England, northern France and northern Germany · Low CountriesBetween 1511 and 1520, an estimated several thousand windmills were operating in the Low Countries alone. Along the northern Dutch coast, post mills and tower mills coexisted, jointly handling drainage, grinding, and sawing, becoming the power backbone of the regional economy. Manor lords across the English counties commonly held mill-rights, and windmill taxes were an important source of feudal income. Blade design had by then undergone multiple improvements, with wooden square canvas sails gradually replaced by lattice sails to suit different wind speeds. Millers became an indispensable technical profession in the countryside.
4. c. 1550–1850Netherlands (land of windmills) · NetherlandsIn the second half of the 16th century, tower and smock mills, which rotate only their caps, gradually gained the upper hand in large-scale industrial applications since they did not need to turn entirely, but the post mill continued in rural mills for centuries due to its low cost and ease of repair. The Dutch Golden Age (17th century) brought windmill technology to its peak: about 10,000 windmills were used for sawing, papermaking, drainage, and oil pressing, supporting the shipbuilding of the Dutch maritime empire. After the Industrial Revolution, steam engines gradually replaced wind power; by the mid-19th century the number of post mills dropped sharply, and by the 20th century they survived only as cultural heritage.