ery two rows of piers, are laid perforated terra- the bed is being cleaned. Each filter bed has to be tioned that the insulated wire connections of the drill cleaned once a month, which requires a day’s work cotta pipes 8 inches in diameter. These pipes, run- are much more easily handled and much… … the water. If the mouth is raised above the sur- rigidity being obtained by various hog braces face, as it can be of course, no water flows out; and truss rods. The main mast is 3-inch light steel tubing, properly braced and reinforced, forming the lower it is sunk below the surface the faster the…
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