Page:Graphic methods for presenting facts (1914).djvu/284

 Fig. 207. Sales of the "X.Y.Z." Automobile Plant for Three Consecutive Years

The three 4-by-6-inch cards are arranged one above the other so that the curves for different years may be easily compared. Note that November and December were good months in 1910, but poor months in 1911 and 1912. The 1911 card above is the same as in Fig. 205, but here it is printed in one color only. Observe at the right the arrows showing that it is desired that the trend of the curve should be upward. Arrows like this save about two-thirds of the executive's time in looking over a large number of curves