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Production and employment in the portlandcement
PRODUCTION EMPLOYMENT AND PRODUCTIVITY 191938
Indexes of manhours required per unit of output
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100 barrels air separators approximately average Babcock and Wilcox ball and tube barrel of cement capacity utilization CD CD CD CM cement industry cement mill CEMENT PLANTS cement-making changes clinker CM CM CM CM CO CM H CO CO CO Company compartment mills Concrete mill sec construction conveyors costs crushers crushing drilling Dry process dust collectors economies electric factor finished cement H CM H rH Harry Jerome heat horsepower improvements increased installed kiln capacity labor productivity machinery man-hour ratio Man-hours per 100 manufacture National Research Project NRP-NBER cement-plant survey number of plants percent percentage period Portland Cement power shovels pulverizing quarry rate of operation raw materials recuperators reduced rH H rH rH rH rotary kiln sample shovels and locomotives slurry filters steam tube mills U. S. Dept unit labor requirements unit of output value of sales waste-heat boilers wet-process plants