needless, 285 Rectangular co-ordinates, 132 Reduction of earnings, 329, 330 Reducing glass, use of, 241, 329 Reduction in size of drawings, 241 Reflecting lantern for curves, 303 Reflectoscope for curves, 304 Reports of corporations, 307 Returns, election, 341

Revenues of railroads of United States, 257 Review of Reviews, 46, 47, 229, 231 Rittenhouse, Elmer, 175, 351, 352 Road signs, Japanese, 346 Roads in New York State, map, 222 Routing charts, 17 Routing of papers in an office, 34

salesmen, 236 Royal Statistical Society, 205, 206 Rule, slide, 326, 328 Rules for graphic presentation, 361 Russell Sage Foundation, 24, 32, 33

St. Louis & San Francisco Railroad, 224 Sales analysis curves, 188, 269

Sales records by tabulating machines, 324

record map, 223 Salesmen, chart for ranking, 63

routing of, by pins, 226 San Francisco fire, 120, 121 "Satellite Cities", 214 Saturday Evening Post, 238 Savings-banks deposits in United States,

Scale arrangement for charts, 362 Scales, choice for horizontal and vertical,

double, for curves, 79

for charts, 8

on charts, rule for, 211 Scallop shells, 164

Schedule curves for factory output, 150 Schools of the United States, 32 Scientific American, the, 29 Scott, Roscoe, E., 337 Seaboard Air Line Railway, 177 Sections omitted from drawings, 190 Serial numbers for curves, 286 Shading, Ben Day, 331, 332

mechanical, 331, 332 Sheffield Scientific School, 111 Shipping of various countries, 24 Ships, length of, 49, 51 Shot-gun diagrams, 201 Significant figures, 326 Simple comparisons, 20

involving time, 36 Slide rule, use of, 326, 328 Slope of curves, 130, 131 Smoke deposits, measuring, 245 Smooth curves, 118, 119, 201, 357 Smoothing curves, 98 Solid models, 336 Soot deposits, measuring, 245 Sophie 19th, milk record, 278 Spot maps, 246 Standard corporation, 334 Standards for graphic presentations, 363 Statistical Atlas, 8, 28, 36, 65, 80, 130, 168,