INDEX 



815 



Photography — continued 



edge gradient, 564 

 value, 565 

 sensometric constants for type plates and 



films, 563 

 spectral sensitivity, 566 



films, 566 



range, 566 

 Photometric standards, 92, 94 

 candle, 94 



color temperature, 94 

 international, 92 

 low brightness, 95 

 standard of 1948, 94 

 units, definitions, 93 



obsolete, 92 

 Waidncr-Burgess standard, 94 



color, 94 



value, 94 

 Photometry, 87 

 apostilb, 93 



apparent candlepower with distance, 95 

 brightness, 93 

 candle, 93 



Waidner and Burgess, 94 

 conversion factors, 94 

 definitions and units, 93 

 equivalents, 94 

 eye as measuring instrument, 89 



effect of color, 90 

 Fechner law, 90 

 foot-candle, 91, 93 

 flux, luminous, 93, 94 



radiant, 93, 79 

 glare, effect on sensibility, 89 

 illumination, 93 

 light, 87 

 lumen, 93 

 luminosity factors, 87 



vs. field brightness, 88 

 lux, 91, 93 



mechanical equivalent of light, 93 

 phot, 93 

 photon, 93 



relation, instantaneous threshold to field 

 brightness, 88, 90 



vs. field brightness, 90 

 spherical candle, 93 



standards (see Photometric standards) , 

 92, 94 



obsolete, 92 



Waidner-Burgess, 94 

 stilb, 93 



symbols and definitions, 94 

 units, 93, 94 

 Photon, 93, 654 

 Physical constants (see also under name of), 



20, 46 

 relations, 46 

 Physical properties of materials (see also 



Mechanical properties), 187 

 alloys: aluminum, 192 



Babbitt metal, 226 



bearing metal, 226 



beryllium, 220 



brass, 195 



brazing, 223 



Physical properties of materials — continued 



bronze, 195 



carboloy, 224 



copper, 198 



Dow metal, 220 



hardness, 187, 224 , 



iron, 209 



low expansion, 221 



low melting, 225 



magnetic, 455 

 alnico, 454, 455 

 Heusler, 458 

 permalloy, 453 

 superpermalloy, 453 



mirror, 222 



miscellaneous, 217 



resistance, 221 



sealing to glass, 220, 221 



soldering, 223 



special purpose, 220 



steel, 209 



stainless, 213 

 tungsten, 214, 224 

 wire, 215 



strength with lightness, 220 



thermocouples, 221, 222 



white metal bearing, 226 

 aluminum, 192 



concrete (see under Building Materials) 

 copper, 198 

 crystals, 515, 529 

 definitions: elastic limit, 187 



Ericksen values, 187 



hardness, 187 

 Brinell, 187 

 Shore sceleroscope, 188 



modulus of elasticity, 188 

 Young's, 188 



proportional limits, 188 



ultimate strength, 188 

 compression, 188 

 tension, 188 

 elements, 189 

 fibers (see Fibers) 

 glass, 534 



special, 534 

 hardness, 187 



elements, relative, 228 



measuring, 187 



units, 187 

 interior friction, 227 

 iron, 228 



isolated tubular conductors, 418 

 leather, 232 



light hydrocarbons, 293 

 masonic mortars, 229 

 plastics, 239 



optical, 240 

 Poisson's ratio, 227 

 rigidity modulus, 226 



temperature effects, 227 

 rope, 245 

 rubber, 234 



artificial, 236 



compression, 237 



natural, 235 

 rupture, modulus, 188 



