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In Roman North Africa, several installations from around 300 AD were found where vertical-axle waterwheels fitted with angled blades were installed at the bottom of a water-filled, circular shaft. The water from the mill-race which entered tangentially the pit created a swirling water column that made the fully submerged wheel act like true ...
The Poncelet wheel is a type of waterwheel invented by Jean-Victor Poncelet while working at the École d'Application in Metz. It roughly doubled the efficiency of existing undershot waterwheels through a series of detail improvements. The first Poncelet wheel was constructed in 1838, and the design quickly became common in France.
They are notable for their medieval origins, for their large number and for the enormous size of two of them - for nearly 500 years the tallest waterwheels in the world. In the 21st century Hama's norias no longer provide a water supply but are celebrated as an example of advanced water supply technology in medieval Muslim societies and for the ...
A few historical norias were hybrids, consisting of waterwheels assisted secondarily by animal power. ... was invented by ibn Bassal (fl. 1038–1075) ...
Traditional breastshot waterwheels consist of a series of flat blades fixed to the rim of a wheel. The blades were typically mounted so they faced straight out along the radius of the wheel. Water from the millstock flowed into the wheel at a point on the side of the rotation, hitting the blades and imparting momentum on the blades. The weight ...
The Greeks invented the two main components of watermills, the waterwheel and toothed gearing, and used, along with the Romans, undershot, overshot and breastshot waterwheel mills. [ 2 ] The earliest evidence of a water-driven wheel appears in the technical treatises Pneumatica and Parasceuastica of the Greek engineer Philo of Byzantium (ca ...
Although the year of his birth is uncertain, it is known that Du Shi was born in Henei, Henan province. [2] Du Shi became an Officer of Merit in his local commandery before receiving an appointment in 23 as a government clerk under Gengshi Emperor (r. 23–25), following the revolt against the Xin dynasty usurper Wang Mang (r. 9–23). [2]
Fragments of such machines have been found in mines which were re-opened in the Victorian era in Spain, especially at Rio Tinto, where one example used no less than 16 such wheels working in pairs, each pair of wheels lifting water about 3.5 metres (11 ft), so giving a total lift of 30 metres (98 ft). The system was carefully engineered, and ...