802 



SMITHSONIAN PHYSICAL TABLES 



Factorials, 26 



log of, 26 

 Factors, conversion (see Conversion factors) 

 Fahrenheit temperature scale, 8 



conversion to Centigrade, inside front 

 cover 

 Farad, 20 

 Faraday, 47, 51, 54 



constant, 47, 54 

 Fathom, 62 



Ferromagnetic substances, 451 

 Fibers: 



artificial, 243 

 acetate, 244 

 glass, 244 

 nylon, 244 

 polyethylene, 244 

 quartz, 534 

 rayon, 243 

 resin, 243 

 characteristics, 242 

 miscellaneous, 244 

 natural, 242 

 cotton. 242 

 flax, 242 

 hemp, 242 

 jute, 242 

 linen, 242 

 ramie, 242 

 silk, 242 

 spider, 242 

 wool, 242 

 properties of, 241, 243 

 rope, 245 



various kinds, 245 

 Filaments, incandescent, heat loss from, 116 



temperature, 102, 116 

 Filters (see also Color, screens), for obtain- 

 ing monochromatic x-rays, 696 

 light, 537 



narrow spectrum region. 536 

 Fine structure constant. 49, 51, 54 

 First radiation constant, 80 



units, 80 

 Fission, 653, 706 

 binding energy, 707 

 cause, 706 



critical energy for, 707 

 cross section of fissionable nuclei for neu- 

 trons, 708 

 cross section of fission products for 



thermal neutrons, 708 

 data, 706 

 elements. 706 

 energy, 706 

 critical, 707 

 released by, 707 

 examples, 706 



neutron-binding energy of divided nu- 

 cleus, 707 

 produced, 706 



elements, 706 

 products of long life. 708 

 spontaneous, half-life. 707 

 thresholds (Mev), 706 

 Fixed points, temperature scale, primary, 71 

 secondary, 72 



Flame temperatures, 179, 182, 183 



Flash lamps, 110 



Flash tubes, 111 



Fluidity, 5, 318 



Fluorescent lamps, characteristics of, 110 



Fluorescent powders, characteristics of, 107 



Fluorite, 515, 520 



Flux (see under type of), 93 



Foot-candle, 93 



Foot-lambert, 93 



Foot-pound, 5, 21 



Foot-poundal, 5 



Force, 5 



magnetic, 18 

 Formulas (see under name of) 

 Fourier, 144 



Fraunhofer lines, wavelengths, 577 

 Freezing mixtures, 134 



anti, for radiators, 135 

 Freezing point, lowered by various salts in 

 solution, 131 

 water-pressure effect, 118 

 Fresnel formula, reflection of light, 549 

 Friction, different materials, 336 



interior, at low temperatures, 227 

 Frictional electric series, 375 

 Fuels (see also under Combustion), 180 

 coal, 181 



analysis, 181 

 gas, 182 



gravity, 182 

 heat values, 180 

 liquid, 181 



gravity, 181 

 petroleum, 182 

 density, 182 

 woods, 181 

 analysis. 181 

 Fundamental particles, 664 

 alpha-particles, 664 

 denteron, 664 

 electron, 664 

 negatron. 664 

 positron, 664 

 meson, /u (charge + , — ), 664 



7r (charge +, — , 0), 664 

 neutrino, 664 

 neutron, 664 

 photon. 664 

 proton, 664 

 Fundamental standards, 1, 13 

 maintenance of, 14 

 primary. 13 

 qualities of, 13, 14 

 secondary, 13, 14 

 selection of, 1, 2 



standards of, international temperature 

 scale, 14, 70 

 length, 14 

 mass, 14 

 temperature, 14 



Celsius scale (Centigrade), 14 

 Fahrenheit. 8 

 Kelvin scale, 9 

 Reaumur. 9 

 thermodynamic, 9 

 time, 14 



