Graphic Methods for Presenting Facts
Percentage op Each Race in the Population of the World
Yellow 45
White 41
Black 11
Brown 2
Red 1
It requires mental concentration in interpreting even these simple figures to get the correct impression of the very large percentage of the two chief races and the numerical insignificance of the one last named. If these data were shown in a simple horizontal bar, somewhat like that seen in Fig. 1, the relative proportions of the different races
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Scale l«=»Cent.
-- 5 Cents
Fig. I. Disposition of a s-cent Fare Paid to the Boston Elevated Railroad in the Year
Ending September 30, 1909
The horizontal bar gives an especially good method for showing component parts
COMPONENT PARTS
would instantly be seen without any mental effort on the part of the reader.
Fig. 1 is a very satisfactory form of chart to bring out the component parts of any group total. The horizontal bar need be made only wide enough to show the various kinds of shading necessary to give a good contrast. Engineering dimension lines above each block in the bar are of great advantage 50%
for convenient reading. The dimension
lines permit of group- y<^rVh--''- ^'^<>';"--^-i'>'v-^;v /-^i^'^VivSo:^'^
ing in such a manner /'*^^•••X^";^^^'^;:i•>^i^^f^•^
that several of the detail blocks could be included in various sets of dimension lines to show such items as total fixed charges, total operating expenses, etc.