Graphic Methods for Presenting Facts
Chart to Show the Dependence of Com Yield upon the Quantity of Rainfall during the Month of July. The Yield of Corn is Given in Bushels per Acre
This chart is misleading. The close similarity of the two curves has been obtained by plotting one curve on a larger scale than that used for the other curve. The rainfall curve has been plotted with the bottom of the chart as zero. The corn-yield curve is, however, drawn with the scale starting at twelve.
COMPARISON OF CURVES
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Max. Load
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A -Hotel
B - Apartment House
C- Department Store
D- Combined Load Curve
B-Loft Buildine
F- Office Building
Note; Combined Load Curve shown in true size
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Fig. IIS. Typical Curves Showing the Twenty-Four Hour Demand for Electricity during the Summer Months in Various Types of Buildings in New York City
Curve D shows the fluctuations in the load on a power house supplying all of the buildings represented by curves A, B, C, E and F. By combining loads of different types, the power plant can be kept more continuously busy than otherwise possible. After the other curves are all plotted, curve D can easily be located by stepping ofl^ with draftsmen's dividers on each vertical line the heights of all the different curves at that particular line