Studies in Equipment Changes and Industrial Techniques... |
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100 barrels air separators approximately auxiliary equipment ball and tube barrel of cement blasting capacity utilized cement industry cement mill CEMENT PLANTS cement-making clinker coal companies compartment mills construction conveyors coolers costs crushers crushing declined driers drilling Dry process dry-process plants dust collectors economic efficient plants electric employed employment Equivalent production thousands factor finished cement grinder Harry Jerome heat horsepower improvements increased individual plants installed kiln capacity labor productivity maintenance man-hour ratios Man-hours per 100 Man-hours thousands manufacture mechanization National Research Project NRP machinery-manufacturers survey NRP-NBER cement-plant survey Number of plants Percent of capacity period Portland Cement PORTLAND-CEMENT INDUSTRY power shovels pulverizing quarry rate of operation raw materials reduced rotary kiln shovels and locomotives slurry filters special cements steam Steam shovel technique technological thousands of barrels Topkis trend tube mills U. S. Dept unit labor requirements unit of output value of sales wage earner waste-heat boilers wet-process plants