Public works . SAND-WASHIXG PLANT AND LOADING COMMANDS SAND PIT - s DIAGRAM OF SAND-WASHING PLANT 46 PUBLIC WORKS Vol. 52, No. 3 tracts 3 and 4, covx-ring most of the south end ofthe turnpike. The pit was located near Colchesterat about the middle of the 16 miles of road that wasserved by it. ihe san-l was excavated by a i-yardclamshell bucket, operated by the 70-foot boom of aguyed derrick. As soon as the sides of the excava-tion receded from the reach of the boom, the sandwas washed down a natural slope by a hydraulic jetprovided with water pumpe-d from a creek about2,000 feet aw
Public works . SAND-WASHIXG PLANT AND LOADING COMMANDS SAND PIT - s DIAGRAM OF SAND-WASHING PLANT 46 PUBLIC WORKS Vol. 52, No. 3 tracts 3 and 4, covx-ring most of the south end ofthe turnpike. The pit was located near Colchesterat about the middle of the 16 miles of road that wasserved by it. ihe san-l was excavated by a i-yardclamshell bucket, operated by the 70-foot boom of aguyed derrick. As soon as the sides of the excava-tion receded from the reach of the boom, the sandwas washed down a natural slope by a hydraulic jetprovided with water pumpe-d from a creek about2,000 feet away and delivered under 125 poundspressure through a 2-inch nozzle, the pumping beingdone by a duplex pump furnished with steam froma boiler. The clamshell bucket trumped the sand on a grizzly,elevated about 40 feet above the surface of theground, where it was washed with four streams ofwater at about 50 pounds pressure through nozzlesmade by flattening 2-inch pipes. The rejects passeddown the inclined s
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
