. Electric railway journal . When the results of their observations are averaged, acurve is plotted which resembles the characteristiccurve for the route except that it shows diagonal linesextending between points of observation instead of thebroken line of the exact records of the characteristiccurve. The difference between the two is that thecheck curve applies to every car on the route and isexact only in so far as it applies to the points of obser-vation. The characteristic curve is exact with re-gard to the particular cars upon which observations aretaken, but the curves naturally apply t
. Electric railway journal . When the results of their observations are averaged, acurve is plotted which resembles the characteristiccurve for the route except that it shows diagonal linesextending between points of observation instead of thebroken line of the exact records of the characteristiccurve. The difference between the two is that thecheck curve applies to every car on the route and isexact only in so far as it applies to the points of obser-vation. The characteristic curve is exact with re-gard to the particular cars upon which observations aretaken, but the curves naturally apply to every car on theroute only upon the assumption that the records of thecars that are observed are typical of all. As mentionedbefore, this is a close approximation only. Observations by men stationed at fixed points arealso taken to determine whether the service on anyline is ample. Such observers are placed at the point ofmaximum load indicated by the characteristic curvefor the route. The observers record the total number. Pittsburgh Traffic—Combined Characteristic Curve, Showing Percentage of Traffic Off at Various Points on a Main Line ELECTRIC RAILWAY JOURNAL [Vol. XLIII, No. 17.
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