INDEX. 



447 



PAGE 



Micron, fi 7, 436 



Milky way, pole of 4'4 



Minerals: densities 115 



refractive indices: biaxial 286 



isotropic 282 



uniaxial 284 



specific heats 229 



Minimum energy for light sensation 261 



Mixtures freezing 211 



Mobilities, ionic 405 



Moduli, see mechanical properties 74-i3 



Mogendorf series formula 275 



Moist air, density of I33-I35 



maintenance of 135 



transparency to radiation, .36 to 1.711. 411 

 to 2o/ti . . . 308 



Molecular collision frequencies 399 



conductivities: equivalent .... 349-352 



specific 346-348 



crystal units 400 



diameters 399, 400 



free paths 399 



heats of adsorption 407 



liquefaction 407 



kinetic energy 408 



magnitudes 399~4oo, 408 



number in cm 3 , 76 cm, o C 48 



gram -molecule 408 



velocities 399 



weights of colloids 406 



Moments of inertia: earth 427 



formulae ......... 70 



Month 4i4, 436 



Moon: albedo 41 7 



distance from earth, parallax 4 T 4 



radiation compared with sun's 407 



Musical scale 148 



tone quality 149 



Mutual induction 37& 



Nernst thermomagnetic potential difference .... 385 



Neutral points, thermoelectric 3*7 



Neutralization, heat of 246 



Nickel, Kerr's constants for 383 



magnetic properties, o to 100 373 



resistance in magnetic field 384 



Nitrogen thermometer 192 



Nitroso-dimethyl-aniline, refractive index 280 



Nuclear charge, atomic 393, 4i 



Number of stars 417 



Numbers atomic 409 



X-ray spectra and .... 390-393 



Numbers: magnetic character 433 



sun-spot '....415 



Nutation 4*4 



Observatories, magnetic elements at 434 



Ohm: xxxvii, xxxviii, 311 



electrical equivalents 311 



Oersted xlvi 



Oils, viscosity of 156, 157 



Optical constants of metals 295 



Optical rotation magnetic 378383 



Optical thermometry 250 



Organ pipes, pitch 149 



Organic compounds: boiling points 203 



densities 203 



melting points 203 



Organic salts, solubilities 170 



Oscillation constants wireless telegraphy .... 362 



times of wires, temperature variation . . 101 



Overtones 149 



Tf pi 14, 436 



P-limit (proportional limit) 74 et seq. 



Parsec 414 



Parallax, solar, lunar 414 



stellar 412, 415 



Paramagnetism 365 



Partials (sound) 149 



Particle, smallest visible 406 



Peltier effect: 317, 321 



pressure effect 320 



Pendulum, second: formula; latitude variation . . 42? 



Penetration cathode rays 37 



high speed molecules 387 



Pentane candle 260 



thermometer 194 



Periodic system: Hackh 410 



Mendelejeff 409 



Permeability, magnetic 365 et seq. 



Persistence of vision 258 



Petrol-ether thermometer 194 



Phosphorescence (radio-active excitation) .... 394 



Phot 259 



Photoelectricity 403 



Photographic data: intensification 264 



lights, efficiencies 264 



plate characteristics 263 



resolving power 263 



speeds various materials . . . 263 



Photometric definitions, units 259 



standards 260 



Physiological constants of the eye 258 



Pi (ir) 14,436 



Pigments, reflecting powers f(X) 299 



Pipes, organ: pitch 149 



Pitch: 148 



organ pipes 149 



voice, limits 149 



Planck's " h" 408 



radiation formulae, Ci Co 247 



Plane, air resistance to 150-152 



Planetary data 416 



Platinum resistance thermometer 195 



thermoelectric thermometer 196 



thermoelectric powers against 319 



Poisson's ratio 101 



Polonium radioactive series 39 8 



Polarized light: reflection by 295-296, 297 



rotation of plane 310 



magnetic 378-383 



Porcelain, resistance, f(t) 332 



Positive rays 386 



Potential (emf ) : accumulators 313 



cells voltaic 312-313 



contact 314,316,404 



ionizing 403 



Peltier 321 



sparking, kerosene 355 



various . . . . 353-355 



resonance 403 



standard cells 313 



thermo-electric 317-320 



pressure effect . . 320 



Weston normal xli 



portable xliii 



Poundal 436 



Precession 414 



Pressure: air, on moving surfaces 150-152 



barometric, reductions, capillarity . . . 143 

 gravity . . 138-143 

 temperature . . 137 



boiling water 144 



critical, gases 212 



mercury columns 136 



volume relations, gases 104 



water columns 136 



Pressure effect on boiling points 200 



melting points 200 



resistance electrical 326 



thermoelectric powers 320 



Pressure vapor: alcohol, methyl and ethyl .... 178 

 aqueous (steam tables 234) . 183-186 



elements 175 



mercury 180 



salt solutions 181 



water vapor (steam tables 234) 183186 



various 176-181 



Probable errors 56-50 



Probability integral 56-57 



inverse 60 



Proportional limit (P-limit) 74 et seq. 



Pupil diameter 258 



Purkinje phenomenon 256 



Quality, tone 



Quartz: refraction indices . . . . 

 transmission of radiation by 



149 

 280 

 30$ 



