INDEX 



791 



Astronomy, stars — continued 

 novae, 761 



repeating, 761 

 pulsating, 760 

 P Cygni, 761 

 red, 760 

 RV Tauri, 760 

 semi-irregular red, 760 

 semiregular, 760 

 temperature, 750 

 with large radial velocities, 766 

 Z Camelopardalis, 761 

 stellar (see stars) 

 stellar diameters, 753 

 stellar radiation measurements, 759 

 stellar spectra: classes, 748, 750, 753 

 dwarf, 762, 783 

 galactic concentration, 749 

 luminosity classification, 747 

 percentage various classes, 748 

 proper motion, 742 

 related characteristics, 746 

 systems, 746 



brighter stars, 746 

 clouds of Magellan, 746 

 Milky Way, 746 

 supergalaxies, 746 

 temperature, 753, 754 

 types and magnitudes, 753 

 strata, age, 741 

 sun (see Sun), eclipses, 742 

 telescopes, largest in use, 728 

 temperature, interstellar space, 763 

 time, calendars, 732, 733 



equation, 728 

 transmission of light through space, 771 

 Astrophysics, 728 

 Atmosphere (see also Air), 592 

 aqueous vapor, 599 



pressure, sea level, 605 

 characteristics, above F2 layer, 595 

 up to F2 layer, 594 

 density, above F2 layer, 595 

 up to F2 layer, 594 

 vs. height, 594, 595 

 electricity (see Lightning), 614 

 extent of, 592 

 humidity, 596 

 maintenance, 599 

 pressure, 602 



relative, dry-bulb temperature, 602 

 temperature, 602 

 vapor pressure, 602 

 wet-dry thermometer, 604 

 ionic equilibrium, 615 

 layers: 



ionosphere, 592 

 E layer, 592 

 Fi layer, 592 

 F 2 layer, 592 

 G layer, 592 

 stratosphere, 592 

 troposphere, 592 

 upper atmosphere, 592 

 mass, 592 



and solar altitude, 725 

 path through (radiation), 720 



Atmosphere — continued 

 potential gradient, 614 

 pressure, above F2 layer, 595 



up to F2 layer, 594 



vs. height, 594, 595 

 regions, 592 

 standard, 4, 47, 345 



basis, 345 



characteristics, 347 

 above F2 layer, 595 

 height, 594, 595 

 ratio specific heats, 345, 349 

 up to F2 layer, 594 



density, 347 



extension of, 347 

 properties, 347 

 stratosphere, 592 

 temperature, above F2 layer, 595 



harmonic mean, 346 



up to F2 layer, 594 



vs. height, 594, 595 

 transmission of radiation, 538, 546 



components, 538 



ultraviolet, 538 



with direction, 720 

 troposphere, 592 

 unit of pressure, 4 

 viscosity, 345, 347 

 water-vapor pressure, 600, 605 



saturated, weight, 601 

 Atmospheric electricity, 615 

 charge, 615 



rain, 615 



snow, 615 



space, 615 

 conductivity, air, 615 

 current, 614 



density, 614 

 ions, 615 



equilibrium, 615 



life of, 615 



mobility, 617 



rate of formation, 615 

 lightning (see also Lightning), 614 

 potential gradient, air, 614 

 Atom, 653 



angular momentum, 579 

 Bohr, 579 

 bomb, 653 

 composition, 618 

 data, 582, 618-624 

 diameters, 643 



elements, 643 

 diffusion coefficient, 644 



gaseous ions, 644 



neutral gases, 644 

 dimensions, 618 

 effective radii, 643 

 electric orbits, 624 

 electron configuration, 622 



elements, 622 



neutral atoms, 582 



ionization potential, 582 



normal states, 622 



singly ionized, 584 



ionization potential, 584 



