INDEX 



6/3 



PAGE 



Photography: resolving powers 342, 345 



f (developer) 345 



sensitometric constants 341 



sharpness 342 



spectrum sensitivity 343, 344 



transparency of plates 342 



velocity constant 341 



Photometric measures: electric lamps 338-340 



photographic plates 345 



standards: Bougie decimale 334 



candle, American 334 



International 334 



pentane 334 



sperm (English) . . 334 



Carcel unit 334 



Hefner " 334 



Waidner-Burgess 334 



units: brightness 333 



candle 333 



flux (lumen) 333 



foot-candle 333 



lamhert 333 



lumen 333 



luminosity 333 



luminous flux 333 



lux 333 



mechanical equivalent of light.. 333 



phot 333 



radiant flux 333 



spherical candle 333 



Physical constants, Birge 73 



Pi (77-), 3-14159265359 14, 660 



Piezo-electricity 448 



Pigments, reflectivity 381 



Planck's black-body radiation 314-317 



h, 6.547X io - -' 7 erg • sec 94-99 



radiation formula, constants 313 



Plane, air resistance 198—199 



Planetary data 606 



Planets, diameters 606 



Plates, photographic, sensitivity, f(X) 343-344 



Platinum, mechanical properties 124 



Poises 205 



Poisson's ratio 137 



Polarization, rotation of plane 396 



magnetic 476-479 



Pole of galaxy (milky way) 60 1 



Poles, magnetic, of earth 575 



Potassium, radioactive constants 519 



Potential differences, voltaic cells 398-400 



first ionization 499 



gradient, atmospheric electricity 596 



ionization, H, He+ 106 



second ionization 500 



volta contact 548, 549 



Poundal 660 



Power, electrical equivalent 397 



resolving, of photographic plates 343 



Power factor, insulating materials, radio frequencies. 453 



Precession 601 



Pressure, critical, of gases 271 



earth, internal 569 



vapor: alcohol, ethyl 227 



methyl 227 



aniline 228 



bromobenzene 228 



bromonaphthalene 229 



carbonbisulphide 228 



chlorobenzene 228 



elements 224 



evaporation rate 223 



low temperature 226 



mercury 229 



organic liquids 225-226 



salt, aqueous solutions 230-231 



tungsten 321 



water vapor, saturated 232-233 



Primary standard, red Cd line 347 



Probable error 57—59 



Probability integral 56-57 



inverse 60 



Proper motion: first magnitude stars 619 



f( spectrum class) 626 



nearer stars 619 



stars of large 625 



PACE 



Protons 492 



mass, t.66xio- M g 105 



specific charge 105 



Pupil diameter 332 



Purkinje effect (stellar magnitudes) 602 



Pyrometry, optical 248 



Quantum : azimutlial numbers 495 



Hund's numbers 504 



inner numbers 495, 503, 504 



L. M, numbers 504 



life, average, various states 511 



mechanics (I. C. T., 1, 47; 5, 393) 



numbers . . . 488 



summary 496 



total numbers 494 



Quartz: physical properties 654 



refraction indices 362 



rotation of plane of polarized light 396 



transmission of radiation by 390 



p. Poisson's fatio 137 



Bn, gas constant, 22.4135 1/mol 77 



Radial velocity of stars 619, 628 



Radian 40, 656 



circular functions in terms of 37-40 



Radiant flux 333 



Radiation constant, d, Planck's 107, 313 



C2, " 104, 3' 3 



a. Stefan-Boltzmann's ...104, 313 



black-body data, f(X, T) 3i4~3'7 



total 313 



cooling by, across ah spaces 327 



high temperatures 328 



ordinary temperatures 326 



pressure effect 325 



density of 104 



emissivities: partial; metals, oxides. .320-324 



total 320 



tungsten 321 



eye, sensitivity to 330 



visibility, relative 332 



limits of various types, wave lengths.... 501 



mechanical effects of 501 



sky 611 



solar: at earth's surface 555 



atmospheric transmission of 555 



at top of atmosphere, f( month, 



lat.) 556 



ultra-violet 555 



transmissibility by air. moist 392 



alum 390 



atmosphere 555 



u.-v. . . . 389 



color screens 391 



crystals, f(X) 390 



dyes, f(\) 385 



filters, narrow regions. 384 



ftuorite, f(\) 390 



gases 393 



glass, f(\) 386-388 



Iceland spar 390 



lamp black 395 



long-wave, f(X). 393-395 



moist air 392 



quartz. f(X) 390 



rock salt, f (X) 390 



sea water 389 



solids 393 



i.-r 393 



solutions 396 



steam 392 



various mate- 

 rials 384, 394 



various materials, 



2011 to 130/1 393 



water, f (X) 392 



tungsten 321 



units, conversion table 501 



visibility of, by eye 330, 332 



wave-length limits of various types 50 1 



Radiations, wave lengths of various 501 



Radii of gyration 72 



Radio data (see wireless telegraphy) 452-462 



Radioactive atomic changes 493 



equilibrium 535 



isotopes 486 



