. Report on the engineering and operating features of the Chicago transportation problem . 5 o 5 o Q o zO i o. o S g o R g s o o O c o ^ Q. IC KK a; ^ SJ the 7 i)er cent increase basis, and ^|;(0,()(t<).000 (ni tlic .1 jtcr centincrease basis. iliese two curves rei)reseiit, therefore, the two extremesbetween wiiich the average gross receipts of all the (omi)inedsurface and elevated lines of Chicago will vary during the i)eriodl)etween lit02 and 1952, and llie probability is that an averagecurve figured accoiding to the law on a 5 jter cent base, as shownon cune K on plate 14, wil
. Report on the engineering and operating features of the Chicago transportation problem . 5 o 5 o Q o zO i o. o S g o R g s o o O c o ^ Q. IC KK a; ^ SJ the 7 i)er cent increase basis, and ^|;(0,()(t<).000 (ni tlic .1 jtcr centincrease basis. iliese two curves rei)reseiit, therefore, the two extremesbetween wiiich the average gross receipts of all the (omi)inedsurface and elevated lines of Chicago will vary during the i)eriodl)etween lit02 and 1952, and llie probability is that an averagecurve figured accoiding to the law on a 5 jter cent base, as shownon cune K on plate 14, will be IouikI to approximate the actualgrowth of tile future, and cuixc L oii tlie same plate representsthe i)robable gross receipts Tor lliis iat( of iiiciease for corre-sponding periods. 98 THE CHICAGO TRANSFORTATION PROBLEM On Plate 15 arc i)lotted curves M to S inclusive, showing oper-^ating expenses per year corresponding to each of the curves, Cto L inclusive, of population increase shown on plate 14, on theassumption that the operating expenses will remain (30 per cent ofthe gross
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