. The book of the farm : detailing the labors of the farmer, steward, plowman, hedger, cattle-man, shepherd, field-worker, and dairymaid. Agriculture. THE DUCT. THE COUPLED STOMK DtTCT. consisting of a sole lying on the gi'ound, supporting 2 stones meeting at the top, forming an equilateral triangle of 6 inches a side. This form en- courages a deposition of sediment to a greater degree than the fonner, but it prevents, to any dangerous extent, the descent of the water under the sole. Having a flat bottom, the drain can easily be cast out with a width at top of only 15 inches
. The book of the farm : detailing the labors of the farmer, steward, plowman, hedger, cattle-man, shepherd, field-worker, and dairymaid. Agriculture. THE DUCT. THE COUPLED STOMK DtTCT. consisting of a sole lying on the gi'ound, supporting 2 stones meeting at the top, forming an equilateral triangle of 6 inches a side. This form en- courages a deposition of sediment to a greater degree than the fonner, but it prevents, to any dangerous extent, the descent of the water under the sole. Having a flat bottom, the drain can easily be cast out with a width at top of only 15 inches to a dejith of 3 feet. The slanting stones of the duct are held in their position by selected stones being placed on each side, which act as wedges between them and the eaith; and the whole structure is retained in its place by 18 inches of small stones above them b, covered with turf c, and the earth d returned above them. (749.) A more perfect duct than either of is made by a tile and sole. In all main drains, formed of whatever materials, capable of con- veying a considerable body of water, a sole is absolutely requisite to pro- tect the ground from being washed away by the water, and a more effect- ual protection cannot be given to it than by tile and sole. A main-tile, which the tiles in main drains are called, of 4 inches wide and 5 inches high, will contain a large body of water ; but should 1 such tile be consid- ered insufficient for the pui-pose, 2 may be placed side by side, as repre- sented by a and h in fig. IGO. Should a still larger space be required, 1 or 2 soles may be placed above these tiles, and other tiles set on them, as a and b are. Or should a still dcejier and heavier body of water be re- quired to pass through a main drain, 1 or 2 tiles can be inverted on the ground on their circular top, as a, fig. 161, bearing each a sole c upon its open side, and this again surmounted by another tile b in its proper posi- tion. In such an an'angement, there
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectagriculture, bookyear
