Spectrum, 433 Spherical aberration, 408 Spinthariscope, 458 Stability, 108 Standpipe, 46 Static and current electricity compared, 287 electrical machines, 262 Steam engine, 213 turbine, 225 Storage battery, 312 Stress and strain, 94 Sublimation, 199 Surface tension, 22 Sympathetic vibration, 372 Telegraph, 283 wireless, 450 Telephone, 349 receiver, 349 transmitter, 350 wireless, 460 Telescope, 428 Temperature, 162 absolute scale, 164 Tempered scale, 370 Theory, 3 Thermometer, air, 167 centigrade, Fahrenheit, 163 gas, 167 Thermos bottle, 176 Thermostat, 188 Three-color printing, 440 Three-phase currents, 479 Three wire transmission, 480 Torricelli's experiment, 57 Trade winds, 182 Transformer, 345, 467 uses, 347 Turbine, steam, 225 water, 154 Vacuum cleaner, 76 pan, 210 Velocity, 86 Vibration strings, 378 sympathetic, 372 Visual angle, 424 Viscosity, 20 Volt, 295 Voltaic cell, 270 advantages, 274 amalgamation, 273 local action, 273 polarization, 273 simple, 270 Voltmeter, 295 Water wheels, 152 overshot, 152 turbine, 154 undershot, 153 Watt, 123, 317 Wave theory, of light, 442 Waves, beats, 376 interference, 374 longitudinal, 358 sound, 358 transverse, 358 visible, 357 Wedge, 144 Weight, 104 Wheatstone bridge, 304 Wheel and axle, 136 Wind instruments, 383 Wireless telegraphy, 450 telephony, 460 Work, 119 units, 119 "X" rays 454 Transcriber's Note: This book uses B.T.U. and B.t.u., electrophorous and electrophorus, e.m.f. and E.M.F. and this has been left as written. Hyphenation is also inconsistent, e.g. electro-plated and electroplated. On page 324, Exercise number 8 was not used in the original. The exercises have not been renumbered. End of the Project Gutenberg EBook of Physics, by Willis Eugene Tower and Charles Henry Smith and Charles Mark Turton and Thomas Darlington Cope