. Engineering and Contracting . Inth3 bottom layer, which rests on the concrete floor, the bricksare laid end to end in rows 41-2 in. apart. Beginning 3 ft. fromthe side walls, they are laid to the main drain running alongthe center of each filter, and form drains 4% in- wide and 3in. deep. In the top layer the bricks are laid across the drains (12) Engineering and Contractvnq for March SI, 1920. 351 so as to form a continuous surface, broken only by the narrowslits due to the irregularity of the bricks. It is through theseslits that the water makes its way to the under-drains. Themain drain i
. Engineering and Contracting . Inth3 bottom layer, which rests on the concrete floor, the bricksare laid end to end in rows 41-2 in. apart. Beginning 3 ft. fromthe side walls, they are laid to the main drain running alongthe center of each filter, and form drains 4% in- wide and 3in. deep. In the top layer the bricks are laid across the drains (12) Engineering and Contractvnq for March SI, 1920. 351 so as to form a continuous surface, broken only by the narrowslits due to the irregularity of the bricks. It is through theseslits that the water makes its way to the under-drains. Themain drain is semicircular, 24 in. wide, and is covered bystone slabs 2 in. thick. Filter Outlet Regulator.—The main drain leads to the rec-tangular filter outlet chamber, which contains a Glenfield-Jones automatic outlet regulator, the object of which is tomaintain a constant rate of filtration. Each of these regu-lators consists of an outlet pipe 14 in. in diameter capable ofsliding up and down inside a closely fitting cast iron pipe. si:£| Automatic Filter Outlet Regulator. fitted with a flat base, which is bolted down to the floor of the chamber. This has a right-angled branch through which the filtered water passes to the filtered water conduit. At its top the sliding pipe is fitted with two weirs, each 15in. long, attached to galvanized iron float tanks, so arrangedthat the outlet can be made to discharge a maximum of 1,100gals, per minute. This is equivalent to 152 vertical inches per24 hours. The apparatus can be set to deliver at any ratebelow the maximum. The standard rate is 96 vertical inches A- B= WOR
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
