. Electric railway journal . ernment the city of Chicago and theBoard of Supervising Engineers it was agreed that thenecessary first cost for the initial investment required ofthe companies to comply with the 1912 ordinance would be$4,984,424, provided the ordinance was interpreted uponan average maximum load for a fifteen-minute period. , the city electrician, however, said that the net costwould be about $3,000,000, taking into consideration onlythe cost of apparatus not useful to the companies otherwisethan for correction of electrolysis. The Board of Supervising Engineers was then
. Electric railway journal . ernment the city of Chicago and theBoard of Supervising Engineers it was agreed that thenecessary first cost for the initial investment required ofthe companies to comply with the 1912 ordinance would be$4,984,424, provided the ordinance was interpreted uponan average maximum load for a fifteen-minute period. , the city electrician, however, said that the net costwould be about $3,000,000, taking into consideration onlythe cost of apparatus not useful to the companies otherwisethan for correction of electrolysis. The Board of Supervising Engineers was then asked bythe Council to recommend a modification of the 1912 ordi-nance and suggested a compromise plan which has beenapproved by a sub-committee of the local transportationcommittee of the Council. This plan, drawn up by Bion , chairman of the board, is substantially as follows: PROPOSED ORDINANCE The city is to be divided into three zones. The first or in-ner zone is to comprise the most congested district, bounded. November i, ELECTRIC RAILWAY JOURNAL 967 by Chicago Avenue on the north, Lake Michigan on theeast, Twelfth Street on the south and Halsted Street on thewest. The second or- middle zone comprises the more con-gested portion of the territory in the city lying outsideof the first zone, while the third zone takes in that portionof the city not included in the other two zones. All unin-sulated electric return circuits are to be so arranged thatthe sustained maximum difference of potential between anytwo points on any uninsulated portion of the circuit shallnot exceed 10 volts in the inner zone, 15 volts in the middlezone and 20 volts in the outer zone. The Board of Super-vising Engineers is to have the power, however, to pre-scribe limits from time to time, notwithstanding the exactfigures mentioned in the plan. This is to provide for thepotential gradient. It also has the power to increase theallowable drop in the outer zone to 25 volts at such pointsas
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