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Rh through the water, and to empty after reaching the highest level into a receptacle provided with a conduit which leads the water to the field. In Szechwan province some of these current wheels are so large and gracefully constructed as to strongly suggest Ferris wheels. A view of one of these we are permitted to present in Fig. 175, through the kindness of Rollin T. Chamberlin who took the photograph from which the engraving was prepared. This wheel which was some forty feet in diameter, was working when the snap shot was taken, raising the water and pouring it into the horizontal trough seen near the top of the wheel, carried at the summit of a pair of heavy poles standing on the far side of the wheel. From this trough, leading away to the left above the sky line, is the long pipe, consisting of bamboo stems joined together, for conveying the water to the fields.

Fig. 172.—Fields recently flooded with the Chinese foot-power chain pump preparatory to plowing for rice.