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,

172, 215 Statisticians for corporations, 293 Steam, cost of producing, 12 Steam turbine, tests of, 122 Steel, curves for strength of, 119 Steel plates, weight of, 333 Stockholders of corporations, number of, 308 Storage capacity curves, 159 Straw-board for mounting maps for pins,

for use with map pins, 191

Street-car service map, 225

String for routing salesmen, 237

Stream velocity, 87

Swazey, Edward Scott, ii

Subdivision of components, 8

SuflFern & Son, 30, 213

Survey, the, 6, 245

Swinging display fixtures for maps, 233

Symbols for charts, 345, 346

System, 15, 90, 123, 223.

Tabulating Machine Company, 322, 323,

324, 325 Tabulating machines, 320, 321, 322, 323,

machines for cards, 323 Tacks, celluloid-covered, for maps, 247,

map, 225, 247, 248 Tarr and McMurray's new geographies,

Taylor, Graham Romeyn, 214, 221 Telephone load curves, 108

rates, 126

service curves, 179

service in Wisconsin, 178 Telephones in United States, pin map,

number used in United States, 354 Temperature curves, 117, 118 Thompson, A. T. & Co., reflectoscope, 303 Thomson, H. F., 198 Three-dimensional charts, 205, 206 Time charts, 53 Time-distance charts, 64, 67