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The first practical windmills were panemone windmills, using sails that rotated in a horizontal plane, around a vertical axis. Hooper's Mill, Margate, Kent, an eighteenth-century European horizontal windmill It was first built to pump water, and subsequently modified to grind grain as well. This design was the panemone, with vertical lightweight wooden sails attached by horizontal struts to a central vertical shaft. One of the earliest recorded working windmill design found was invented sometime around 700–900 AD in Persia. 400, the 7th century, or after the 9th century. Another early example of a wind-driven wheel was the prayer wheel, which is believed to have been first used in Tibet and China, though there is uncertainty over the date of its first appearance, which could have been either c. His description of a wind-powered organ is not a practical windmill, but was either an early wind-powered toy, or a design concept for a wind-powered machine that may or may not have been a working device, as there is ambiguity in the text and issues with the design. Hero of Alexandria (Heron) in first-century Roman Egypt described what appears to be a wind-driven wheel to power a machine. Wind-powered machines may have been known earlier, but there is no clear evidence of windmills prior to the 9th century. A 19th-century reconstruction of Heron's wind-powered organ
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