. The street railway review . (V.) (VI.) Eg z + f (I + D) Making the same substitutions in Eq. V. and VI, as weic made in II , placing (I + D) =.io, and remembering that | varies accordingto the method and distance under discussion, we get $E = 155Z + _ (VII) E = (139 + 36 M) 2 + « (VIII). i 0 6 10 12 14 16 18 20 22 56 28 30 DISTANCE FROM STATION IN MILES. DIAGRAM II. Operating Expenses of Plant Delivering 200 Amperes at 500 Volts, Including Coal, Oil, Waste, Water, Labor; and Interest and Depreciation on the Investment. Diagram II. represents these equations plotted for varying valu
. The street railway review . (V.) (VI.) Eg z + f (I + D) Making the same substitutions in Eq. V. and VI, as weic made in II , placing (I + D) =.io, and remembering that | varies accordingto the method and distance under discussion, we get $E = 155Z + _ (VII) E = (139 + 36 M) 2 + « (VIII). i 0 6 10 12 14 16 18 20 22 56 28 30 DISTANCE FROM STATION IN MILES. DIAGRAM II. Operating Expenses of Plant Delivering 200 Amperes at 500 Volts, Including Coal, Oil, Waste, Water, Labor; and Interest and Depreciation on the Investment. Diagram II. represents these equations plotted for varying values ofM, being taken at 40. The intersection of the upper curve with the upper straight line is thepoint at which the booster system costs as much to operateas does thedirect system, This distance we find 10 be twelve and one-half shorter distances, direct feeding is more economical, while forlonger distances the booster system has an absolute advantage. Now,the assumption upon which Eq. V and VI were solved, is a feeder con-stantly loaded to its maximum capacity. The absurdity of this assump-tion is apparent when one considers the actual conditions which obtainin railway work; the average load on the feeder during the entire vearwill be more nearly one-third or one quarter of t
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
