Map of the Eclipse of the Sun June 9th and 8th. 1937.

By the use of symbols, a time-analysis of the eclipse of the sun is made. The "date line" showing the change from Wednesday to Tuesday is particularly interesting.

MAPS WITH SYMBOLS

National Rrtourcr* Board, "State Planning." 193S. SCALE .7

Metallic Ores and Rare Minerals in Maine, August 1934.

The purpose of this symbol map is to show the geographic location of metallic ores and rare minerals in Maine. No quantitative data is presented.

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SCALE .8

National Rrtourcrt Board, "Statr Planning," 1935.

Industrial Distribution in the State of New Hampshire in 1932.

By increasing the size of the symbol, a quantitative as well as a location analysis is made.

Aekansas/T^nnessm.

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SCALE .6

American Iron and Stcrl Inititute, N. Y. C, 1937.

A. Steel Ingot and Finished Steel Capacity of the United States in 1937.

This combination of circles and squares gives a concise statement of two sets of data: steel ingot capacity and finished steel capacity in the United States. A section only of the original map is shown.

Alcmandcr Hamilton Institutr, Bureau of Butinesi Conditiont, "Butineti Conditions Weekly," July 33. 1938.

SCALE .5

B. Map of Credit and Sales Conditions in the United States in July 1938.

Since interest is chiefly in the "active-and-up" cities, the choice of a solid black symbol to represent them was a logical one.

Chapter 27 FLOW MAPS

Jflow maps may be used to show both qualitative and quantitative flow of goods, persons, automobiles, etc. When a flow map is used to indicate the number of persons or automobiles on streets and highways, it is generally called a traffic map.