The earliest type of capital in Lombardy and Germany is known as the cushion-cap, in which the lower portion of the cube block has been cut away to meet the circular shaft . These types were generally painted at first with geometrical designs, afterwards carved.
12.
In Roman North Africa, several installations from around 300 AD were found where vertical-axle water wheels fitted with angled blades were installed at the bottom of a water-filled, circular shaft . The water from the mill-race which entered the pit tangentially created a swirling water column that made the fully submerged wheel act like true water turbines, the earliest known to date.
13.
In the east wall of the transept is a niche leaf with beautiful moulding of foliate design In the south-east angle of the transept is a beautiful Early English double " piscina " under two trefoil arches one in each wall supported on three circular shafts the central shaft being in the angle of the walls In the chancel are two ancient benches with well carved poppy heads.
14.
Two helix-turbine mill sites of almost identical design were found at Chemtou and Testour, modern-day Tunisia, dating to the late 3rd or early 4th century AD . The horizontal water wheel with angled blades was installed at the bottom of a water-filled, circular shaft . The water from the mill-race entered the pit tangentially, creating a swirling water column which made the fully submerged wheel act like a true turbine.
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