Graphic Methods for Presenting Facts
The comparison of the losses in the different power systems is very clearly shown in this illustration, which was taken from a paper by George VVestinghouse
Broad bars can be used either vertically or horizontally. The horizontal arrangement is usually the more convenient, as it lends itself more readilj' to the use of type and horizontal lettering for the titles, data, etc., of each bar, without forcing the reader to turn the book at right angles. In Fig. 32, however, the lettering can perhaps be more conveniently grasped by the reader with the bars placed vertically instead of horizontally.
Note the lines connecting different bars to show how the components compare in size therein. These lines assist greatly in giving a clear and rapid interpretation of the chart.
Fig. 33 is an admirable example of what the graphic method can do to boil down complex facts for quick interpretation by the reader. In this case the schools of each of the forty-eight United States were
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