Maps Showing Sourcfe of Materials. Geographic Organization Charts. Comparisons of Geographic Areas. Pictorial Maps.

20. Relief and Aerial Maps 170

Oldest Known Map. Bird's-Eye View Maps. Diagram Maps. Statistical Relief Maps. Block Diagrams. Azimuthal Projection.

21. Crosshatched and Colored Maps 178

Comparison of Ben Day Shadings and Colors. Sampling Maps. Density Maps. Mechanical Intensity Shading Map.

22. Dot and Pin Maps 187

Map Marking Devices. Slave Maps. Bell System Map.

23. Maps With Circles and Sector Charts 194

Scales for Areas of Circles. Census Data. Distribution. Migration.

24. Maps With Bar Charts 200

Traffic Charts. Historical Maps. Map from New York World's Fair, 1939.

25. Maps With Curve Charts 208

Moving Averages. Precipitation.

26. Maps With Symbols 211

Quantitative and Qualitati«ve Data. Pictorial Units.

27. Flow Maps 216

Flow of Goods. TrafRc Maps. Weather Maps. Hurricane Maps. Traffic Time.-Zones Map. Chart by M. Minard.

28. Contour Maps 231

Topographic Maps. Weather Maps. Before and After Comparisons.

29. Distorted Maps 238

Rectangular Maps. Population.

TABLE OF CONTENTS

Chapter Page

30. Rating Charts 243

Tabulation Form. Mental Development. Safety Records.

31. Chronology Charts 248

Time Analysis and Time Studies. Chart for Assigning Vacations.

32. Progress Charts 256

Time Studies. Material Control Board. Production Progress Chart. Gantt Charts.

33. Curve Charts 263

One Curve on a Grid. Visual Captions. Historical Labels. Stair Charts. Deviation from Normal.

34. Comparison With Two Curves 275

Cumulative Curves. Causal Relationships. High-Low Curves. Lag.

35. Comparisons With Curves 286

Progressive Average and Moving Average Curves. Normal Trend.

36. Component Parts Shown by Curves 294