The Coordirectograph—A Mechanical Device for Rapid Quantitative Comparison of Curves Dissimilar in Ordinate and/or Abscissal Values

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Abstract
A mechanical labor‐saving device is described for converting two curves with differing ordinate and/or abscissal values to identical scales in the two axes, and for quantitatively subtracting such curves. Since the various uses of the appliance depend upon its ability to convert different ordinate values to the same scale, it is called a coordirectograph.

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