A Manual of Design and Construction, 1938, prepared by Committee on Standards for Graphic Presentation, under procedure of American Standards Association, with The American Society of Mechanical Engineers as sponsor body.

CURVES. The plotting on rate-of-change charts requires considerable care because of the peculiar character of the logarithmic spacing. Where special grids are prepared without intermediate rulings, it is desirable to use a logarithmic plotting scale which may easily be made from printed commercial paper of the proper dimensions.

In general, rate-of-change charts call for simple lines connecting the points of value. Columns or surfaces, of course, should not be used to indicate values on a rate-of-change chart. Columns and surfaces may be used on an arithmetic chart to indicate changes in ratios, however.

GRAPHIC PRESENTATION

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Annual Review Number of -Iron Age." January 6. 1938 An Arithmetic Chart Showing Prices of Non-ferrous Metals in the United States from 1917 to 1937.

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