Handbook of mechanical and electrical cost data, giving shipping weights, capacities, outputs, and net prices of machines and apparatus, and detailed costs of installation, maintenance, depreciation and operation, together with many principles and data relating to engineering economics (1918)
Gillette, Halbert Powers, 1869-, Dana, Richard Turner, 1876-1928, joint author · New York, McGraw-Hill · leaf 433
.9. Table II — JEfficiency of conversion ranges from 49 to 81%. Table IV — Same ranges from 50 to 81%. Table II — Cost of coal per million B.t.u. ranges from 11.1 to13.6 cts. Table IV — Same ranges from 8.1 to 15.3 cts. Note.— In all the above comparisons, except efficiency of con-version, the… … Human Drive 54 Helpers 2 Skilled Laborers Chain Grate & Conveyer20 Helpers4 Skilled Laborers Fig. 29. Reduction of steam cost in boiler house by elimination ofhuman labor. Reduction of Steam Cost in Boiler House by Elimination ofHuman Labor. Fig. 29 shows graphically the economic results ofthe…
