. Rudimentary treatise on agricultural engineering . a manner precisely the same, only the framing has to bebraced and secured in a stronger manner. A series of small hand-gates, called shuttles or flashes, aresometimes placed on the top of the larger gates. The prin-cipal conditions to be observed in the construction of theseworks are, that they shall be an effectual guarantee againstfloods, or any sudden rise of the water in the should be as permanently constructed as possible, andbe made to work easily, which they very seldom do, and agreat deal of hammering and heaving with c
. Rudimentary treatise on agricultural engineering . a manner precisely the same, only the framing has to bebraced and secured in a stronger manner. A series of small hand-gates, called shuttles or flashes, aresometimes placed on the top of the larger gates. The prin-cipal conditions to be observed in the construction of theseworks are, that they shall be an effectual guarantee againstfloods, or any sudden rise of the water in the should be as permanently constructed as possible, andbe made to work easily, which they very seldom do, and agreat deal of hammering and heaving with crowbars takesplace when they are required to be opened; this is moreespecially the case when the gates are made too wide, whichthey often are; great care shoidd also be taken in making asound junction with the banks and the wings of the sluice-frames above, so that no water may find its way throughfrom the back. As much water as will, having flowed throughthe sluices, the next operation is to lift the remainder up tothat level, that it also may berudimentarytreat03andr
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