INDEX 



819 



Rocks: bulk modulus (rock forming ma- 

 terials), 740 

 dielectric constant, 426 

 elastic constants, 740, 741 

 electrical resistivity, 395 

 specific heat, 162 

 Rods, demagnetizing factor, 467 

 Rope, 245 

 fiber, 245 

 wire, 215 

 plow, 215 

 specification, 215 

 steel, 215 

 values, 215 

 Rotation of plane of polarized light, 557 

 Rubber: 



artificial, 236 



physical properties, 236 

 comparison, 237 

 compressibility, 237 

 natural, 235 



physical properties, 235 

 strength, 235 

 Rupture, modulus, 188 

 Rutherford, 672 

 Rydberg constant, 48 

 deuterium. 48, 51, 54 

 helium, 48, 51 

 hydrogen, 48, 51, 54 

 infinite mass, 48, 51, 54 



Sackur-Tetrode constant, 52 



Satellites (see also under Astronomy), 734, 



735 

 Saturn, 735 



Schrcidinger constant, 51, 54 

 Screens (woven wire), 188 

 Sealed-beam lamp, 108 

 Seas, physical data (see also Oceans), 773 

 Sea water (see also Water), 774 

 Second radiation constant, 50, 80 



precaution for use, 80 



value, 80 

 Seconds pendulum, length vs. latitude, 717 

 Self-inductance, 13 

 Series, mathematical, 24 

 Series relations in atomic spectra, 578 



Bohr atom, 579 



energy levels, designations, 579 



J values, 570, 580 



L values. 579 



quantum principle. 581 



Rydberg constant, 578 



S values, 569 

 symbols, 580 



spectral designation, 580, 581 

 quantum principles, 581 



spectral levels, 581 

 Pauli principle. 580 



spectral terms, 579 



means of identification, 580 



spectroscopic properties, neutral atoms, 

 582 

 singly-ionized atoms, 584 



terms from electrons, 579, 580 



wave numbers, 578, 579 



Showers, cosmic rays, 654 



Siegbahn, wavelength scale, 48, 54 



Silver chloride, 520 



Sines, 32 



Sky, illumination due to, 725 



Slug, 6, 337 



metric, 337 

 Snow reflection factors, 554 

 Sodium carbonate, 550 

 Sodium chloride, 531, 550 

 Solar constant, 719 

 monthly means. 720 



1920-1952, 720 

 yearly means, 720 

 Solar corona, 744 

 emission lines, 744 

 flares, 743 

 Solar irradiation at sea level, 723 

 latitude, 725 

 monthly, 720 

 Solar motion, 731 



elements, 731 

 Solar parallax, 731 

 Solar radiation, 719 

 air masses, 720 

 ' vs. sun's elevation, 720 

 atmospheric transmission, 719 

 biological effective component, 724 

 constant, 720 

 corona emission, 744 

 distribution over disk, 722 

 flares, 743 

 illumination, 725 

 sky, 725 

 sun, 725 

 intensity, 721, 725 

 outside atmosphere, 721 



mean intensity, 721 

 relative intensity, 724 

 spectral distribution, 724 

 Mount Wilson, 724 

 outside earth's atmosphere, 721, 722 

 sea level, 723 

 sunlight, distribution over Mount Wilson, 

 724 

 illumination due to, 725 

 sunshine, duration, 724 

 total, 719 



to earth, 719 

 variation with time and latitude, 725 

 Wolf's sunspot number, 727 

 Solder, 223 

 flux, 223 



hard, for aluminum, 223 

 for brass, 223 

 for copper, 223 

 for gold, 223 

 for iron, 223 

 soft, for brass, 223 

 for copper, 223 

 for gold, 223 

 for iron, 223 

 for lead, 223 

 for zinc, 223 



