Engineering and Contracting . to the bouldersmaking loading difficult, and partly to thesmall loads carried to the dump. But it is thehigh transportation cost which attracts atten-tion. This vNas due to the road to the dumpbeing exceedingly rough and muddy after re-cent rains, the scrapers sinking at times al-most to the hubs. The loads were conse-quently small, wasting away, and the rate ofmoving (.9 and ) materially reduced. Ob-servations were taken in the afternoon of thesame day when a new and less difhcult pathwas used, and the effect was shown increasing to 101 ft. per minu
Engineering and Contracting . to the bouldersmaking loading difficult, and partly to thesmall loads carried to the dump. But it is thehigh transportation cost which attracts atten-tion. This vNas due to the road to the dumpbeing exceedingly rough and muddy after re-cent rains, the scrapers sinking at times al-most to the hubs. The loads were conse-quently small, wasting away, and the rate ofmoving (.9 and ) materially reduced. Ob-servations were taken in the afternoon of thesame day when a new and less difhcult pathwas used, and the effect was shown increasing to 101 ft. per minute and KSto 23l ft. per minute, and the transportationcost being reduced cts. per cubic yard. The observations of Table VIII were madewhere the material handled was a coarse sandwith a sprinkling of loam. In this instance the reverse of the last casecited is true. Here the transportation cost isnormal, but the static cost (which sliows(luctuaticns in cost due to all operations ex-cept actual transportation), is very Fig. 5. Typical Arrangement of Teams inWheel Scraper Work. scraperb are not actually engaged in thehandling of material, that in consequence thestatic cost was excessive. It will be noticedin the time study that two or three of thescrapers turned about shortly without waste TABLE 11.—WHEEL SCRAPERS IN LOAMAND CLAYEY LOAM. Total Total No of Load, cost per cost per scrapers. D. cu. yds. cii. \d. \W haul. 4 :i05 II.;;?. v4 4 130 5 180 . 300 : 235 5 160 4 .... 225 4 200 225 5 :... 180 4 550 4 290 5 290 4 300 5 300 5 250 4 & 5 262 4 ....... ISO 4 ... 260 4 325 4 350 4 250 Mln. 4 130 Av 4 4 261 90 Max 5.::::::: SbJ
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