FIG. 93.—Steam Shovel at Work on Sewer Trench for North Shore Intercepting Sewer, Evanston, Illinois. ]
Steam shovels are rated according to their tonnage and the capacity of the dipper in cubic yards. Both are necessary as the size of the dipper is varied for the same weight of machine, dependent on the character of the material being excavated. For rock the dipper is made smaller than for sand. Gillette in his Hand Book of Cost Data gives the coal and water consumption of steam shovels as shown in Table 52. The performance of steam shovels is recorded in Table 53. The conditions of the work have a marked effect on the output of the shovel. A shovel in a thorough cut, i.e., in a trench just wide enough for the shovel to turn 180 degrees but too narrow to run cars or wagons along side of it, will perform less than one-half of the work that it can perform in a side cut, i.e., where the cars can be run along side the shovel which turns less than 90 degrees.
COAL AND WATER CONSUMPTION BY STEAM SHOVELS
(From Handbook of Cost Data, by H. P. Gillette) ───────────────────────────────────┬─────┬─────┬─────┬─────┬─────┬───── Weight in tons │ 35 │ 45 │ 55 │ 65 │ 75 │ 90 Dipper, cubic yards │ 1¼ │ 1½ │ 1¾ │ 2 │ 2½ │ 3 Coal, tons per 10 hour day │ ¾ │ 1 │ 1¼ │ 1½ │ 2 │ 2¼ Water, gallons per 10 hour day │1500 │2000 │2500 │3000 │4000 │4500 ───────────────────────────────────┴─────┴─────┴─────┴─────┴─────┴─────
──────┬──────┬──────┬───────┬───────────┬──────┬──────────────┬──────── Weight│Dipper│Depth │ Width │ 10–Hour │ Cost │ Authority │Remarks in │Cubic │ of │of Cut │Performance│ in │ │ Tons │Yards │ Cut, │ │ │Cents,│ │ │ │ Feet │ │ │ per │ │ │ │ │ │ │Cubic │ │ │ │ │ │ │ Yard │ │ ──────┼──────┼──────┼───────┼───────────┼──────┼──────────────┼──────── 25 │ 1 │ 9 │36 in. │ 85 │ 22.6 │R. T. Dana │ 1 │ │ │ │ │ │ Eng. Rec., │ │ │ │ │ │ │ 69:581 │ 25 │ 1 │ 8 │35 in. │ 96 │ 23.5 │ do. │ 2 70 │ 2 │ 26 │16 ft. │ 569 │ 6.7 │ do. │ 3 30 │ 1 │15–18 │60 in. │ 300 │ │A. B. McDaniel│ 4 │ │ │ │ │ │ Excavating │ │ │ │ │ │ │ Machinery │ 15 │ ⅝ │ 14 │134 ft.│ 400 │ │Eng. Cont’r, │ 5 │ │ │ │ │ │ 8–25–09 │ │ 8 │ 36 │ Very │16 yd. cars│ │Marion Steam │ 6 │ │ │ wide │ │ │ Shovel Co. │ 55 │ │ │ │ 296 │ │H. P. │ 7 │ │ │ │ │ │ Gillette’s │ │ │ │ │ │ │ Cost Data │ 65 │ 2¼ │ │ │ 280 │ │ do. │ │ │ │Greater│ 700 │ 30.6 │G. C. D. │ 8 │ │ │than 78│ │ │ Lenth, Eng. │ │ │ │ in. │ │ │ News-Record,│ │ │ │ │ │ │ 85:22 │ ──────┴──────┴──────┴───────┴───────────┴──────┴──────────────┴────────
