Engineering and Contracting . drum,2-cylinder hoist, of 25 to 30 HP. Thisoutfit handles on an average 250 cu. loose material in 24 hours at an aver-age cost of 49 cts. per, cubic yard. In exi)lanation of this high cost it may bestated that the wages of laborers $5 per day with board, or $8 with-out board; that bituminous coal atNome costs $17 per short ton, and thatspruce wood for fuel costs about $12per cord. The scrapers drag the ma-terial from the pit to ttte dump, a hori-zontal distance of from 100 to 300 a vertical distance of 20 to SC gang employed usually
Engineering and Contracting . drum,2-cylinder hoist, of 25 to 30 HP. Thisoutfit handles on an average 250 cu. loose material in 24 hours at an aver-age cost of 49 cts. per, cubic yard. In exi)lanation of this high cost it may bestated that the wages of laborers $5 per day with board, or $8 with-out board; that bituminous coal atNome costs $17 per short ton, and thatspruce wood for fuel costs about $12per cord. The scrapers drag the ma-terial from the pit to ttte dump, a hori-zontal distance of from 100 to 300 a vertical distance of 20 to SC gang employed usually consists ofthree to four men—a fireman, a hoist-man and either one or two men to fill,guide and dump the scraper. The formand rigging up of the scrapers and thesystem of sheaves and drawback usuallyemployed are shown in the accompany-ing figure. Toothed scrapers, like theone shown in the cut, are not alwaysused, but are preferred. An adaptationcif one of these plants was used in strip-ping loam in excavating for a reservoir. Enq-Contr Sketch Showing Arrangement in SteamScraper Work. at Portland, Ore. In this case a bottom-less scraper was used. The scraper hada theoretical capacity of 6 yds., but actu-ally handled about 3 yds. In the workin seven 10-hour days, stripping to 4 depth, 400 cu. yds. per shift werehandled by the outfit. Furrows 300 were made by the scraper. A60 HP. boiler was used but only onecord of wood at $2 was burned per double drum hoist, provided with 10 x12-in cylinders and geared 6 to 1, wasused. The gang consisted of a winch-man, a fireman, and two scraper men, at$ per day. Under these considera-tions the operations were said to costabout 5 cts. per cubic yard. Building permits totaling $580,492,196 invalue were granted in the larger cities ofthe United States in 1907. February 26, 1908. ENGINEERING-CONTRACTING 129 LETTERS TO THE EDITORS. Some Additional Data on the Methodand Cost of Constructing Rein-forced Concrete Poles. Sirs.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
