Note 25 — Chapter IV

Note 25.—Water-wheels. The water-wheels here mentioned are machines commonly used for the purpose of irrigating fields and gardens. They are generally turned by a pair of cows or bulls. They raise the water from a river or well in a series of earthen pots attached to cords which pass over a vertical wheel, and pour it into a trough, from which it flows in narrow channels through the space of ground to be irrigated. A cogged vertical wheel is attached to the same axis as the former; and this, and consequently the other also, are turned by means of a larger, horizontal, cogged wheel. The ground is divided into hollow squares, or furrows, into each of which in succession the water is admitted.