Page:Graphic methods for presenting facts (1914).djvu/157

 If charts similar to Fig. 124 are used, the executive can tell instantly whether the stocks in different departments or of different kinds of material are increasing or decreasing simultaneously and proportionately.

"To summarize—with the ordinary arithmetical scale, fluctuations in large factors are very noticeable, while relatively greater fluctuations in smaller factors are barely apparent. The logarithmic scale permits the graphic representation of changes in every quantity without respect to the magnitude of the quantity itself. At the same time, the logarithmic scale shows the actual value by reference to the numbers in the vertical scale. By indicating both absolute and relative values and changes, the logarithmic scale combines the advantages of both the natural and the percentage scale without the disadvantages of either."