If only the percentage covered in each type of industry were given, the representation

would be obviously false.

GRAPHIC PRESENTATION

Massachusrtts Institute of TechnoloRy, "The. Technology Review." February 1933.

Occupational Distribution in 1930 of 134 MIT Graduates of the Classes of 1917 to 1929 Inclusive.

1. This chart is in reality a group of 100% bar charts. It was placed in this chapter

because of its resemblance to the preceding charts.

2. The emphasis on the area for "Major Executive" tends to make the comparison a

vertical one, resulting in area comparison.

CHARACTERISTICS OF AREA BARCHARTS:

Area bar charts may take one of two forms:

a. They may have one dimension in percentages of a total and the second dimension in numerical values.

b. They may have both dimensions in percentages of two different totals. They then become 100% squares or blocks.

Chapter 18 GENERAL USE OF MAPS

DOTS, circles, bars, curves, symbols, etc., may be placed on a base map to give the geographic location of statistical data. When used in this way, the general term "statistical map" may be applied. Synonyms for statistical map are cartogram, map chart.

GENERAL REFERENCES

Paullin, Charles O., Atlas of the Historical Geography of the United States, Carnegie Institute of Washington and American Geographical Society of New York, 1932

Raisz, Erwin, General Cartography, McGraw-Hill Book Co., Inc., New York City, 1938

Encyclopedia Americana.

Outline Sketch of Borgia Map of the Fifteenth Century, A. D.

1. Man's earliest maps consisted of simple drawings. The map shown above is in a more