Supplemental Water Required to Provide 18 Inches Total Water for Crop Use Per Day from May to October on Soils Having Various Infiltration Capacities in Atlanta, Georgia, and Bismarck, North Dakota, from 1930 to 1932.

1. These cities were only two of several for which this analysis was made.

2. The necessity for reservoirs and dams is clearly shown in an effective form.

COMPARISON OF COMPONENT BAR CHARTS

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M.OCM TOTAL

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Land Utilization Comiriittfp. New York Building Congress, Arthur C. HoUlfn, Chairman. SCALE .8

Sources of Income and Ratio of Rent to Income for Families in Block 2007 in New York City in 1936.

1. Seldom does one find a chart in which so much information is given. While it may seem

formidable at first glance, the key at the right simplifies it.

2. This amount of information in words and figures only would require many pages of text

and could not make evident the interrelations clearly shown in chart form.

CHARACTERISTICS

1. Both actual amounts and percentages should be given.

2. When there is one bar to represent the total of all the others, it should be the same width as the others.

3. The amount scale may be placed at both the left and the right of the chart, or it may be placed on the side of greater significance.

Chapter 16 BILATERAL BAR CHARTS