INDEX 



6/9 



PAGE 



Terrestrial magnetism: isoporic lines, 



intensity, total, world.. 580 

 vertical, world. 580 

 mean annual observatory ele- 

 ments 581 



mean annual observatory ele- 

 ments, bibliography 589 



mean monthly magnetic char- 

 acteristic 595 



mean yearly magnetic char- 

 acteristic 595 



observatories, mean annual 



elements 581 



observatories, mean annual 



elements, bibliography . . . 589 



poles, magnetic 575 



secular changes, 



declination, U. S., 1820- 



1930 590 



dip, U. S., 1855-1925. 592 

 horizontal intensity, 



U. S., 1855-1925-.. 593 

 inclination, U. S., 1855- 



1925 592 



total intensity, 



f(lat., long.), U. S., 



1925 594 



isoporic lines, world 



chart 5^0 



secular change, U. S., 



1855-1925 594 



Therm 660 



Thermal conductivity : air 327 



spaces, across 3 2 7 



high temperature. 328 

 incandescent 



wires 329 



alloys 272 



Fourier, conversion factors.. 279 



resistances 279 



unit 279 



gases 277 



high temperatures 273 



insulators 274-276 



liquids, f(p) 278 



organic 277 



metals 2T2 



miscellaneous 273 



organic liquids 277 



salt solutions 276 



sea water 652 



water 276 



, sea 652 



couples: e.m.f. calibration 244-247 



chromel-alumel 247 



copper-constantan, > 0° C. 245 



<o° C. 246 



Pt-PtRh 245 



effect : Ra+Em 325 



expansion, cubical, liquids 283 



gases 284 



high temperature 282 



linear, elements 280 



liquids 283 



miscellaneous 281 



tungsten 3-1 



gradient, earth's interior 569 



properties: ammonia (liquid) 306 



mercury vapor 306 



saturated steam (Peabody). 298-303 



40o°-70o° F. . 304 

 superheated steam, 



2i2°-3oo° F 305 



unit, British 660 



Thermochemistry: heat of combustion: carbon com- 

 pounds . . 307 



, coals 308 



cokes 308 



gases 308 



liquid fuels. 308 



miscellaneous 307 



peats 308 



dilution, H0SO4 312 



formation 31 1-3 1 2 



neutralization 312 



Thermodynamic temperature scale 239, 249 



Thermoelectric scale comparisons 250 



PAGE 



Thermoelectricity: e.m.f 401-406 



against Pb: alloys, 



metals 401-402 



Pt: Al 404 



Cd 404 



metals 403 



Ni 404 



PtRh 404 



Zn 404 



low temperatures, e.m.f 405 



neutral point 400 



Peltier effect 406, 407 



pressure effect 407 



Thomson " 404, 407 



Thermomagnetic effects 482 



Thermometry: 



International scale 239 et seq. 



calibration procedure .... 241 

 secondary points . . 243 

 correction for emerged Hg 



thread 249 



optical pyrometry 248 



standard platinum resis- 

 tance 243 



thermocouple 243, 244 

 Cu-constan- 



tan .245, 246 

 Pt-PtRh ... 245 



stem correction 249 



thermodynamic scale reduc- 

 tion for gas 249 



thermoelectric scales, com- 

 parisons 250, 251 



Thomson effect, thermoelectric 405 



f(p) 407 



Thorium radioactive family 519 



average life 519 



decay value 519 



period, .'. 519 



Threshold sensitivity of eye, f (field brightness) ... 330 



heterochromatic 331 



Thunderstorm electricity 598 



Tidal friction, earth 570 



moon . . 573 



Tides 574 



Time: earth's rotation as measure of 573 



equation of 607, 659 



Tobin bronze, mechanical properties 121 



Transformation temperature: lime-alumina-silica com- 

 pounds 266 



Transparency: air, moist 392 



atmosphere 608 



black absorbers 395 



color screens 391 



crystals 39° 



dyes 385 



earth's atmosphere 608 



glasses, American 387 



various sources . . 388 



Jena, colored 386 



u.-v 387 



narrow regions 384 



long waves: 20 to 130,11, various 



screens 393 



20 to 150/1 394 



io8±,it 395 



photographic plates 345 



star space 643 



steam 392 



ultra-violet atmosphere 389 



Jena glass 387 



sea water 389 



various materials 388 



water 392 



vapor 392 



Tribo-electric series 408 



Trigonometric functions: degrees, nat., logs., 



radians 32-36 



hyperbolic, nat., logs.... 41 

 radians, nat., logs., 



degrees 37-40 



Tropical year 60 1 



Tropopause. seasonal variation 562 



Tungsten: brightness 321 



gas-filled lamps 338 



lamps 338 



temperature 322 



