River and Canal Engineering, the characteristics of open flowing streams, and the principles and methods to be followed in dealing with them. — 7. Adjustable Weirs.—Drum weirs, invented by Desfontaines, have been used in France and Germany. Two paddles (fig. 47) a

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River and Canal Engineering, the characteristics of open flowing streams, and the principles and methods to be followed in dealing with them. 7. Adjustable Weirs.—Drum weirs, invented by Desfontaines, have been used in France and Germany. Two paddles (fig. 47) a · ch 52/78

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