of a curve, 131 Annalist, the, see Neiv York Times Annalist Annual reports, corporation, 307 Apples, price curves of, 127, 128, 129 Arithmetically ruled co-ordinate paper, 132 Atlas of the U. S. Census, see Statistical

Atlas Atomizer for spraying ink, 57 Authorization for curve records, 284 Automobile exports of United States, 41, 43

factory records, 263

factory schedule curves, 150

sales records, 255, 264 Automobiles, comparison of, 347, 348 Averages, moving, 97, 283

progressive, 153

weighted, 103

Babson, Roger W., 120, 121 Bacteria in river water, 20

in river water at varying depths, 85

Bald Eagle Valley Railroad, 67 Bar diagrams versus curves, 310 Bars combined with a curve, 54

certain made prominent, 29, 30

for use in comparison, 22

horizontal, 4

horizontal, representing time, 53

vertical, 46, 47

vertical, for components, 138 Bead maps, 251 Beads for map use, 247, 248

for statistical charts, 207 Bell Telephone system, 353, 354, 355, 356 Ben Day shading, 216, 220, 331, 332

shading on maps, 209

work, 331, 332 Bertillon, 220

Biologists, use of curves by, 203 Biometrika, 202 Blue-printing, 328

cards, 259, 261

curve cards, 291, 296

machines, 261, 296 Boards for pin records of costs, 191, 192 Bonus earned chart, 52, 54 Boston Elevated Railroad, 4 Boston Globe, 212

Boston Health Department Report, 30, 109 Bowley, Arthur L., ii, 98 Breaks in drawings, 190 Bridges, drawing, upon photographs, 209 Brotherhood of Railroad Trainmen, 103 Building construction in United States, 120,

Buildings, maps for showing height of, 220 Bureau of Railway Economics, 257 Butter-fat curves, 279