executives, 28D

financial reports, 307

record department, 292 Correlation, 129, 199

definition of, 199 Corrugated straw-board for map pins, 191 Cost analysis by pin boards, 191, 192

of handling freight, 184, 188, 192 Cotton goods, production and export, 74,

Cotton production, 22

production and export of United States, Country Gentlevian, 213, 215, 232 Cows, individual record curves for, 278, 279 Crayons for coloring maps, 57, 221 Crayons, paraffin, 57 Crests and valleys of curves, 79

of curves, 79 Croj) Re-porter, 100 Cross-hatching, 9 Cross-index of curves, 291 Croton water-supply curves, 160 Cumulative curves, 149

frequency curves, 174, 176, 177, 182, 184 Cunningham, Wm. J., 132, 134, 135, 136 Curtis Publishing Co., 238 Curve comparison, 107 Curve plotting, 47, 69, 84 Curves and vertical bars, 47

for the executive, 254, 288

interpretation of, 357

inversely related, 126 ,

plotted on cards, 259, 275

Curves and vertical bars, reading of, 30£

serial numbers for, 287

shown by reflectoscope, 803

versus bar diagrams, 310 Cycles of curves, 97, 283 -

in curves, 97, 283 Cylindrical lenses, 330

Data, 7, 42, 88, 126, 178, 204, 243, 333 Data for curves, on face of chart, 80, 258

for curves, shown on chart, 80, 258

included in a chart, 24, 25, 26 Dates, position of, in curve charts, 72 Davenport, C. B., ii, 164, 165 Davis, Pierpont V., ii Day & Zimmermann, 296, 305, 306 Death rates in United States, 174, 351 Decreases shown graphically, 30 Degenerative diseases, 351 Department of Agriculture Field Service,

Dependent variable, definition, 84 Depressions, financial, 104 Dimension lines, 5, 148 Directors of corporations, 289, 298 Dispatching charts for trains, 61, 62, 67 Display fixtures for curves and maps, 305