Its value here lies not as a map for study, but rather as an example of what can be done on a map in the way of regional planning.

CROSSMATCHED AND COLORED MAPS

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1. This is an example of the contrasts in shading made possible by the Ben Day mechanical processes of engraving. Nine contrasting shades increasing in darkness are used here with absolute distinctness. The small numbers in the circles are used to identify the shadings.

2. The illustration below presents the same information in color.

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Potential Water Power in the Different States of the United States, as Estimated in 1914.

Chapter 22 DOT AND PIN MAPS

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ne well known use of dot and pin maps is to present geographic distribution data. In this form, the dots or pins represent numerical values and effectively show geographic location. The placing of the dots is an important item. If the exact geographic distribution of the data is known, the placing of the dots is no problem. However, when the data is in the form of general geographic distribution, such as data for an entire state, the dots are distributed throughout the whole state although one section may have contributed the total amount.