VESSELS PASSING THROUGH A SLUICE.
The imperial, or grand canal of China, extends, with little interruption from Canton, in lat. about 23° 15', to Pekin in 39° 50'.
From this main trunk issue many branches, which pass through innumerable cities, towns, and villages, as roads through European countries; and by this means a communication is kept up with the utmost limits of the Empire; some lesser canals are also cut to counteract the overwhelming effects of inundation; these at the same time serve to convey superflous water over the low lands for the nutriment of rice, which requires immersion in water till it approaches maturity.
Locks and sluices of various kinds are therefore very numerous: the Print exhibits one chiefly designed as a bridge for the accommodation of foot passengers; the building on the right hand serves to shelter those who are employed in raising the bridge, as well as to preserve the stone under it, which records the name, Sec. of the individual who was at the expense of its erection.
Some sluices are so constructed as to retain a considerable body of water for the use of vessels of greater draught; these have grooves cut in the masonry at the opposite piers, into which strong and heavy boards are dropped, similar to a portcullis, and when a sufficient quantity of water is collected, the planks are drawn up and the vessels pass through with considerable velocity, having previously paid a small toll for their admission throuorh the sluice.
The vessel having the yellow or royal flag, is one inhabited by a part of the Embassy; some others occupied by the English have already passed through.
