. A treatise on hygiene and public health . an artificial reservoir, made by damming a smallbrook. Sometimes the collecting galleries or pipes are, as in the instance justmentioned, placed actually beneath the bed of a river or pond. The fig-ure (Fig. 13), represents the section of a collecting gallery (or filter gal-lery, as it is called), which is in actual use at a paper-mill on the Westfieldriver, in Massachusetts. The description of the gallery is as follows : The water is obtained from a gravel or sand bed which lies withinthe bed of the river when the water is high, although not covered
. A treatise on hygiene and public health . an artificial reservoir, made by damming a smallbrook. Sometimes the collecting galleries or pipes are, as in the instance justmentioned, placed actually beneath the bed of a river or pond. The fig-ure (Fig. 13), represents the section of a collecting gallery (or filter gal-lery, as it is called), which is in actual use at a paper-mill on the Westfieldriver, in Massachusetts. The description of the gallery is as follows : The water is obtained from a gravel or sand bed which lies withinthe bed of the river when the water is high, although not covered withwater for the greater part of the year. In this gravel-bed a trench of250 feet long was dug of such depth as to bring the bottom of it as lowas, or lower than, the bottom of the river at its deepest part, and of 6feet or more in width. The trench was then filled to the depth of a footwith stones of various sizes, from small cobble to coarsest gravel stones,making the surface as even as possible, though \dth a slight grade Fig. 13. For a fuller description, see the Third Annual Eeport of the Water Commissionersof the City of Lowell, January, 1873. ON DRINKING-WATER AND PUBLIC WATER-SUPPLIES. 247 On this foundation a line of timbers 6 by 6 inches is laid on eachside of the trench, 4 feet apart. Across these are placed and firmlynailed on, 3 feet apart, square frames 4 feet wide by 3 feet high, made oftimber 6 by 6 inches, each frame strengthened in the centre by a standard3-|- by 6 inches from the top to the bottom. The top and two sides of thisrow of frames are covered with hemlock plank 2^ inches thick, and thusa filtering-gallery 250 feet long, 3 feet high, and 4 feet wide, is made. C^rrvf^ S»oe^
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Keywords: ., bookcentury1800, bookdecade1870, booksubjecthygiene, bookyear1879
