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National RftourcM Committee, "Report of Water Planning Committee, Part III," 1934.

SCALE .7

B. Ten-Year Moving Averages of Annual Precipitation for Marietta, Ohio, and St. Paul, Minnesota, from 1 840 to 1931.

This chart differs from 288B and 289 in that it is a moving average "for ten years ending" rather than for ten years "centered."

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Brinton, "Graphic Methods." McGraw-Hill. 1Q14.

SCALE .9

A, Chart Showing by Months the Average Total Daily Water Consumption In Boston, and by Months the Average Daily Per Capita Water Consunnption. Also the Yearly Average of Daily Consunnption Stated in Total and Per Capita.

1. In this illustration, the curves may be read from either of two different sets of coordinate rulings. Using the horizontal ruled lines, we may read from the curves the average total consumption per day. By reading from the slanting lines, the same curves may be interpreted as the average consumption per capita per day.