Index 



Photometry 279 

 Photomicrography 332 

 Photophone 426 

 Phototheodolite 335 

 Physics, history 11 

 Physiological acoustics, gene- 

 ral 548 



optics, general 482 



optics, instruments 503 

 Pipes (musical) 539 



vibrations in 520 

 Pitch, absolute 545 



standards 545 

 Plates, vibrations 517 

 Polarimeters 410 

 Polarisation, circular 415 



elliptic 415 



general 409 



of heat 416 



instruments and methods 

 410 



by particular substances 417 



by reflection 377, 417 



rotatory 421 



of sky 352 

 Polariscope 411 

 Polarised light 414 



radiation, measurement 418 



radiation, production 416 

 Polarising prisms 411 

 Portable microscopes 321 

 Pouillet's phenomenon 58, 



147, 191 



Pressure of fluids, measure- 

 ment 129, 131 



influence on spectra 440 



of radiation 355, 446 



temperature relation for 

 saturated vapours 201 



thermometry 154 



of vapours 200 

 Primary colours 496 

 Printing processes (photo- 

 graphic) 462 

 Prism 286 



minimum deviation 286 

 Prisms for polarisation 411 



for spectrum analysis 344 

 Projection apparatus 339 



microscopes 321 

 Propagation of sound 524 



of sound in particular 



media 526 



Pyrometers, electric 158 

 Pyrometry, optical 161 



Quality of musical tones -544 

 Quartz, rotatory polarisation 

 422 



Kadiation of black bodies 445 

 emission 442 

 of heat 427 

 of heat and light 427 

 law of emission 444 

 and temperature 446 

 thermometry 161 



Eadiation, velocity, wave- 

 length, etc., general 353 

 Radiation-pressure 355, 446 

 Eadiations, electric 481 



various 481 

 Eadioactivity 481 

 Radiometer 48 

 Radio-micrometer 445 

 Radiophone 426 

 Radium radiations 482 

 Rainbow, theory 350 

 Rainbows 350 

 Rays, general theory 295 

 Recalescence 169, 190 

 Recording thermometers 161 

 Reflecting powers 374 



telescopes 310 



Reflection of electric radiation 

 409 



elliptic polarisation by 416 



of heat rays 403 



irregular 374 



of light 287 



metallic 388 



polarisation by 417 



refraction and absorption 

 of radiation, general 

 373 



and refraction, dynamical 

 theory 375 



and refraction, theory 377 



of sound 530 



theory 376 



total 380 



of waves 509 

 Refracting telescopes 310 

 Refraction, astronomical 347 



atmospheric 347 



in biaxial crystals 381 



and chemical constitution 

 405 



conical 382 



in crystalline media 381 



and dispersion 294 



and dispersion of chemical 

 substances 407 



double 383 



of electric radiation 409 



equivalents 406 



of heat rays 403 



in Iceland spar 385 



influence of temperature 

 379 



of light 288 



molecular 406 



of sound 531 



in strained media 387 



terrestrial 348 



theory 378 



of waves 510 

 Refractive indices 289, 294 



indices of chemical sub- 

 stances 407 



indices of crystals 386 



indices, determination 289 



indices, influence of density 



Refractive indices, influence of 



temperature 380 

 indices of various sub- 

 stances 290 



power of chemical sub- 

 stances 407 



Refractometers 291 

 interferential 365 



Refrigeration 150 



Refrigerators 272 



Resonance 522 



Resonators 523 



Rings of crystals 418 



Rods, vibrations 515 



Rontgen ray tubes 479 

 rays 471 



rays and cathode rays 480 

 rays, diffraction 473 

 rays, emission 474 

 rays, experiments 475 

 rays, nature 476 

 rays, photography 476 

 rays, production 478 

 rays, properties 478 

 rays, reflection and refrac- 

 tion 478 



Rotary steam engines 262 



Rotating discs, experiments 

 497 



Rotation velocity, measure- 

 ment 120 



Rotatory dispersion 421 

 polarisation 421 

 powers of substances 423 



Rupert's drops 169 



Saccharometers 412 

 Safety valves 269 

 Saturated vapours 196, 204 



vapours, pressure tempera- 

 ture relations 201 

 Scales (musical) 546 

 Scintillation 349 

 Seismic apparatus 124 

 Seismographs 126 

 Seismometers 127 

 Seismometric pendulums 125 

 Seismoscopes 128 

 Selective absorption 394 



absorption by crystals 395 



absorption by waters 399 

 Sensitisers (photographic) 458 

 Sensitive flames 535 

 Sensitometry (photographic) 



449 



Sextant 340 

 Ships' velocity, measurement 



120 



Short sight 488 

 Singing flames 521 

 Siren 537 

 Sky, colour 351 



polarisation 352 

 Slide valves 269 

 Societies, reports 29 

 Solar energy, conservation 353 

 heat as motive power 269 



