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CURVE CHARTS

A. Cost of Rubber Per Pound in New York From 1838 to 1937.

When data over a long period of time is plotted in curve form, it is usually necessary to allow a great deal of space horizontally, or to condense the years so that a trend only is indicated. This method of breaking a series of years into four parts solves both these difficulties.

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U- S. Department of Commerce. Bureau of Foreign and Domestic Commerce, "Domestic Commerce." July 20. 1938. SCALE .8

Science Service Inc. Washington. D C. "Science News Letter." February 20 1Q32. SCALE .7

B. The Deviation From Normal Temperature in Iowa From 1873 to 1931.

In this chart a normal was first decided upon and marked as zero. The departures from this normal, or average, were then plotted above and below the zero line. The deviations below normal are distinguished from those above normal by color.

2^2 GRAPHIC PRESENTATION

Abstracts from Time Series Charts. 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.