. Public works . INTERIOR , adjacent channels 2 inches, thus keeping all bricks prop-erly spaced. This form of floor construction gives about40 per cent of air space and is expected to increase theefficiency of the filter. Over these bricks is laid a layerof 2-inch cobblestones about 3 inches deep and on top ofthese is placed the broken stone, which is laid 10 feetdeep. Both local granite and trap rock have been used,in sizes from one to two inches. Through the center of the filter, covering a length of405 feet, is built a flushing gallery with a port hole toeach channel
. Public works . INTERIOR , adjacent channels 2 inches, thus keeping all bricks prop-erly spaced. This form of floor construction gives about40 per cent of air space and is expected to increase theefficiency of the filter. Over these bricks is laid a layerof 2-inch cobblestones about 3 inches deep and on top ofthese is placed the broken stone, which is laid 10 feetdeep. Both local granite and trap rock have been used,in sizes from one to two inches. Through the center of the filter, covering a length of405 feet, is built a flushing gallery with a port hole toeach channel to allow for such inspection and flushingas may be necessary. The channels have a slope of 6. PLACING .^TONE IN SPRINKLING FILTER. 382 MUNICIPAL JOURNAL Vol. XXXVI L No. 12.
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Keywords: ., bookcentury1800, bookdecade1890, bookidpublicworks3, bookyear1896
