───────────────────────────────────────┬───────────────┬─────────────── Type of Engine │ Quantity of │Cost of Fuel in │ Fuel per H.P. │ Cents per │ Hour │ Horse-power │ │ Hour ───────────────────────────────────────┼───────────────┼─────────────── Reciprocating steam engines, simple, │ 21 to 8 lb. │ 4.2 to 1.6 non-condensing, 25 to 200 H.P. │ coal │ Triple condensing, 2000 to 10,000 │2.3 to 1.9 lb. │ 0.46 to 0.37 H.P. │ coal │ ───────────────────────────────────────┼───────────────┼─────────────── Steam turbines, high pressure, │ │ non-condensing, │ │ 200 to 500 K.W. │6.5 to 4.2 lb. │ 1.3 to 0.86 │ coal │ 500 to 3000 K.W. │2.6 to 1.9 lb. │ 0.52 to 0.37 │ coal │ Condensing 5000 to 20,000 K.W. │1.8 to 1.43 lb.│ 0.36 to 0.28 │ coal │ ───────────────────────────────────────┼───────────────┼─────────────── Gas engines │ │ Natural gas, 50 to 200 H.P. │ 19 to 11 cu. │ │ ft. │ Producer gas, 50 to 200 H.P. │ 2 to 1.5 cu. │ │ ft. │ Illuminating gas, 10 to 75 H.P. │ 26 to 19 cu. │ 2.1 to 1.5 │ ft. │ Gasoline, 10 to 75 H.P. │ 1.5 to 0.8 │ 5.6 to 3.0 │ pints │ ───────────────────────────────────────┼───────────────┼─────────────── Oil engines, 100 to 500 H.P. │1.1 to 0.75 lb.│ │ oil │ ───────────────────────────────────────┴───────────────┴─────────────── NOTE.—Coal assumed at $4.00 per ton, illuminating gas at 80 cents per thousand cubic feet, and gasoline at 30 cents per gallon. [Illustration: FIG. 69.—Bessemer Oil Engine. Twin Cylinder, Valve Side. ]