Graphic Methods for Presenting Facts
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W. J. Cunningham in Proceedings of New England Railroad Club
Fig. 124. Book Value of Material on Hand for a Large Eastern Railroad
The logarithmic scale is particularly valuable for an operating chart such as this when there is a great difference in the size of the figures which must be compared. The lower curve here averages about $60,000 while the upper curve averages about $1,100,000. The logarithmic scale permits accurate comparison of various curves to determine whether any curves are out of harmony with the other curves