Graphic Methods for Presenting Facts
THE RISE OF THE LOW-PRICED CAR SHOWING HOW THE AVERAGE VALUE OF EXPORTED AMERICAN AUTOMOBILES HAS DROPPED IN FIVE YEARS
World's Wort
Fig. 45. The Illustration and the Titles are Shown Above Exactly as Originally Printed
The reader is misled if he does not notice that the earliest year has been shown at the bottom instead of at the top. The wording of the two titles, when taken in conjunction with the chart, really adds to the general confusion
AVERAGE VALUE OF AMERICAN AUTO EXPORTS The arrangement of dimension
marks with an arrow-head at each end is a convenient scheme worthy of wide use. Note that the percentage figures in the illustration clearly refer to the value of the cotton rather than to the number of bales. The figures representing time, in this case years, read downward as they should do in every case in which horizontal bars are used to represent facts at different periods of time. If the horizontal bars are arranged with the earliest date at the top, any reader who wishes to do so may read the chart as a curve from the left-hand edge of the page and the dates will then appear in correct order from left to right.
In Fig. 45 the latest date has been placed at the top of the chart. This causes an impression absolutely the reverse of what it was intended to bring out by the drawing. Any one glancing at this chart is likely to suppose that the earlier year is indicated at the top and probably would not notice that the draftsman in this case, for some unjustifiable reason, has reversed the correct arrangement.