Irrigation farm in Italy. A man and two children are standing next to a mule or donkey that is tied to the circular wheel. Nubian wheel. It is a vertical wheel bearing a number of pottery vessels. When the wheel spins in the water, the pottery vessels are filled with water and then poured into the basin to be irrigated (Fig. 5). This wheel is connected to another wheel parallel to it and has wooden gears clipped in the wheels of another horizontal wheel. Connect the animal in a connected arm, and when the animal revolves around the last axis of the wheel, the stem rotates accordingly. See also photo: SS-282. Italy.