INDEX 



821 



Spectra — continued 



Catalan's analysis, 579 



classes, stars, 746, 747, 753 



emissivities, 8, 98-103 



energy 'evels, 581 



quantum numbers, 579 



rotation of electron, 580 



Rydberg constant, 578 



spinning electron, 580 



terms, 579, 580 

 symbols, 579 



X-rays, 699 

 Spectral intensity, 79, 82, 85 

 Spectral luminosity factors, 87, 90 

 Spectral luminous flux, 93 

 Spectral luminous intensities, 95 



blackbody at various temperatures, 95 



brightness of blackbody, 96 



crova wavelength, 96 



mechanical equivalent of light, 93, 96 

 Spectral radiant energy, 79 

 Spectral radiation, 79 

 Spectral sensitivity (photographic), 566 

 Speech (see Sound) 

 Speed (photography), 562 

 Spherical candlepower, 93 

 Spin, 580 



Spreading coefficient (see Colloids) 

 Square statute mile, 62 

 Standard atmosphere, 47, 345, 593 

 Standard observer, 1931 I.C.I., 90 

 Standard temperature, 9, 71 

 Standard wavelengths, 568 



cadmium red line, value of, 569 



elements, prominent lines in simple spec- 

 tra, 575, 577 



extreme ultraviolet standards, 571 



Fraunhofer lines, wavelengths, 577, 578 



preliminary values of mercury 198 , 568 



primary standard, 568 

 cadmium, 568 

 mercury, 568 



secondary standards, 568-571 

 iron, 571 

 krypton, 570 

 neon, 568 



simple spectra, wavelengths and relative 

 intensities, 575, 577 



solar wavelengths, 571, 572 



tertiary standards, iron, 571 

 Standards, fundamental, 13 

 Stars (see also under Astronomy), 728, 746 

 Statahenry, 20 

 Statampere, 11, 20 

 Statcoulomb, 20 

 Statfarad, 20 

 Statohm, 20 

 Statute mile, 63 

 Statvolt, 11, 20 

 Steam: saturated, properties, 169, 175 



superheated, properties, 176 

 Steel, composition of, 465 



high speed, 224 



magnetic properties, 452, 457 



mechanical properties, 209 



permeability, 457, 458 



Steel — continued 



stainless, 213 



transformer, energy losses, 459 



wire, 215 



specifications, 215 



wire rope, 215 



specifications, 216 

 Stefan-Boltzmann constant, 50, 80 

 Stellar system (see also under Astronomy), 



728, 746 

 Steradiancy, 79 

 Stilb, 93 

 Stoke, 321 



Stone (see under Building materials) 

 Strain, 7 

 Stress, 7 



Sugar, combustion values, 182 

 Sugar solutions: 



density, 304 



Baume degrees, 305 

 Brix degrees, 305 



specific gravity, 305 

 Sulfur dioxide, 266 



compressibility, 266 

 Sun (see also under Solar) : area, 731 



brightness, 92 



' calculated, 92 



density, 731 



diameter, 731 



distance to earth, 731 



eclipses 1950-2000, 742 



electric data, 502 



illumination due to, 725 



magnetic data, 502 



mass, 731 



orbit, 770 



matter within, 770 



radiation, 719-725 

 at sea level, 723 

 biological effective, 724 

 over surface, 722 



radius, 731 



shine, duration, 724 

 latitude, 724 

 time, 724 



spots, 727 



annual means, 727 



volume, 731 

 Sun and sky illumination, 725 



Mount Wilson, 724 

 Superconductivity, 394 

 Surface tension, 361 



liquids, 361, 362 

 miscellaneous, 361 



metals at solidification point, 362 



salts in water, 361 



solutions of salt and water, 361 



various materials, 362 



water plus alcohol, 361 

 Sylvite, 519 

 Synchro-cyclotron, 657 

 Synchroton, 654, 657 

 Tangents, 32 

 Tantalum: physical properties, 98, 103 



radiation characteristics, 103 



