INDEX 



823 



Thermodynamic temperature, 9, 14 

 Thermodynamics, 9 

 Thermoelectric effect, 13, 379 



properties at low temperatures, 381 

 vs. copper, 379 

 vs. lead, 379 

 alloys, 379 

 metals, 379-381 

 pressure effect, 382 

 temperature, 387 

 vs. platinum 

 alloys, 381 

 aluminium, 376 

 cadmium, 383 

 metals, 376-390 

 nickel, 389 

 zinc, 390 

 Thermomagnetic effects, 508 

 Thermometry: correction for emergent 

 thread, 72 

 mercury thermometers, 72 

 reduction, gas thermometer to thermo- 

 dynamic scale, 73 

 corrections for various gas thermome- 

 ters, 73 

 Thomson effect, microvolt per degree, 382 

 Thomson heats, 382, 383 

 pressure effects. 382 

 temperature, 383 

 Thunderstorm electricity (see also Light- 

 ning) , 614 

 Tides: height at various places, 779 

 mean sea level, 779 

 geodetic, 779 

 geographic, 779 

 neap, 779 

 spring, 779 

 Time, equation of, 728 



unit, 14 

 Torque, 7 



Transformation: eutectic mixtures, 130 

 lime-alumina-silica compounds, 130 

 of units, 1, 57 

 Transformer rectifier. 657 

 Transitions, crystals, 126 

 Transmission of radiation: 

 air, 538 



components, 538 

 moist, 546 

 alum, 545 

 atmospheric transparency for ultraviolet, 



538 

 cesium bromide, 547 

 color screens, 535 

 crystals, 515, 517 

 dyestuff solutions, 538 

 gases, 547 

 glass, 512 

 Jena, 514 

 lead chloride, 547 

 optical, 512 



red pyrometer glass, 537 

 effective wavelength, 537 

 light filters: Bausch and Lomb, 537 

 Corning glass, 536 

 narrow band pass, 536 

 spectral regions, 536 

 Wratten, 536 



Transmission of radiation — continued 



light through space, 771 



long wavelength, 545, 547 



magnesium oxide, 547 



optical crystals, 517, 545 



red pyrometer glass, 537 



rock salt, 517, 545 



sapphire, 547 



silver chloride, 547 



solids, 547 



substances, various, 546, 547 



sylvite, 517 



thallium bromide, 517 



thallium bromide-iodide, 517 



thallium chloride, 547 



various materials, 554, 556 



water, 536 

 Transparency: 



atmospheric, for ultraviolet, 538 



substances, various, infrared, 546 

 various, for long wavelengths, 555 



ultraviolet, for atmospheric components, 

 538 



water, 536 



water vapor (steam), 545 

 Transverse galvanomagnetic and thermo- 

 magnetic effects, 507 

 Treatment of experimental data (see under 



Data) 

 Triboelectricity, series, 375 



vs. silica, 375 

 Trigonometric functions, 32 



cosine, 32 



cotangent, 32 



sine, 32 



tangent, 32 

 Tritium, 654 

 Triton, 654 



Troy measurements, 63, 64, 66 

 Tungsten (Wolfram), characteristics, 102 



color temperature, 102, 103 



emissivity, 99 



lamp, 106 



melting point, 72 

 pressure, 119 



radiation, 102 

 Twilight, 731 



Ultimate particles, 654, 657 



strength, materials, 187, 188 

 Ultraviolet, transparency for atmospheric 



components, 538 

 Uniform point source, 92 

 Unit pole, 451 



United States system of weights and meas- 

 ures, 60, 61, 63 

 metric to, 60, 61 

 to metric, 60, 62 

 Units: absolute, 2 

 ampere turn, 18 

 capacity 



carrying copper wires, 416 

 electrical, 16 

 mechanical, 60 

 physical, 60-67 

 specific inductive, 11 

 cgs, 15 

 changing, 57 



