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Fig. 75. Advertising Illustration used in a Technical Magazine, with a Heavy-type Statement Proclaiming that "3000 Central Stations in the United States need a High Grade Gasoline-Electric Generating Set"

The black areas indicate the portion of the ^-t-hour power-house load for which the gasoline engine would be used

The curve looks smooth in this illustration simply because the gauge readings were taken so frequently that the nearness of the many points made the lines joining them appear curvilinear rather than angular. Such a smooth curve would not have resulted if gauge readings had been taken only every six hours and the chart made by connecting with straight lines the points plotted for the data obtained at these longer intervals.