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

The three -l-by-e-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

CURVES FOR THE EXECUTIVE

for the last month of the preceding fiscal year instead of using a dot as shown in Fig. 204.

The separate cards for different years, which in Fig. 207 are arranged vertically one above the other, may be laid horizontally as in Fig. 208. Here the cards are superposed on a black background, the left-hand and middle cards each overlying the card to the right, so that the curve appears continuous. The vertical arrangement allows of a very accurate analysis of changes which have occurred from month to month of each year.