Index 



Fluorescence 465 



of particular substances 467 



and phosphorescence 468 

 Fog signals 533 

 Force, measurement 122 

 Forced vibrations 522 

 Forces 2 



Fraunhofer lines 393 

 Freezing 192 



mixtures 150 



point 192 



point of solutions and liquid 



mixtures 217 



Frequency of sound-waves 536 

 Fusion, heats of 188 



and solidification 191 



or solidification, volume 

 change 195 



Galileo's telescope 309 

 Gas engines 257 



lighting 276 



Gases, absorption and adsorp- 

 tion 51 



compressibility 176 



diffusion 69 



effusion 72 



expansion by heat 174, 177 



and gaseous mixtures, 

 liquefaction 207 



heat conductance 231 



kinetic theory 43 



and liquids, molecular 

 theory 41 



measurement of density 

 110 



specific heats 186 



spectra 432 



transpiration 72 



vibrations in tubes 519 



viscosity 73 



viscosity of specified 74 

 General molecular physics 39 

 Geometrical optics, general 274 

 Glass, elastic constants 134 



polarisation colours 420 

 Gratings 371 



concave 345 



for spectrum analysis 345 

 Gravitation 85 



theories 84 



Haidinger's brushes 502 



Halos 349 



Harmonic analysis 86 



Harmonicon, chemical 521 



Heat (general) 146 



and cold, sources, general 



147 



conductance of gases 231 

 conductance of liquids 230 

 conductance of solids 226 

 conductance of specified 



solids 227 

 conduction 223 

 convection 232 

 emission 444 



Heat engines 257 



engines, theory 253 

 and light, radiation 427 

 mechanical or dynamical 



theory 235 



mechanical equivalent 239 

 of moistening 58, 147, 191 

 nature 235 

 polarisation 416 

 radiation 427 

 rays, absorption 401 

 rays, dispersion 403 

 rays, reflection 403 

 rays, refraction 403 

 rays, spectra 403 

 rays, transmission 404 

 supposed production in 



solids by cooling 227 

 units 180 



Heated tubes, sounds from 522 



Heats of dissolution 190 

 of fusion 188 

 of transformation 190 

 of vaporisation 189 



Heterogeneous media, trans- 

 mission of light 342 



High temperatures, produc- 

 tion 147 



History 4 



of steam engines 261 



Hot air engines 258 



Huygens's principle 360, 510 



Hydrogen, spectra 435 



Hydrometers 111 



Hygrometers 215 



Hygrometry 214 



Hygroscopy 214 



Ice 193 



elastic constants 135 

 Iceland spar, refraction in 385 

 Ignis fatuus 447 

 Illuminating apparatus for 



lighthouses 336 

 power 275, 425 

 Illumination 276 



for microscope 316 

 Illuminators for microscope 



312 



Illusions, optical 483 

 Images, photographic 459 



theory 300 



Immersion objectives for mi- 

 croscope 325 



Incandescent lighting 429 

 Indicators, steam engine 265 

 Infra-red rays, measurement 



of wave-length 359 

 spectrum 430 



Institutions, museums, collec- 

 tions 35 

 reports 29 

 Instruments 38 



and methods for polarisa- 

 tion 410 

 musical 538 

 for physiological optics 503 



Intensity of light 278 



of sound waves 535 

 Interference 362 



achromatism in 362 



bands 363 



colours 361 



and diffraction, general 360 



of sound 531 

 Interferential refractometers 



365 



Iron, elastic constants 135 

 Irregular reflection 374 

 Irreversible phenomena 244 

 Isothermal surfaces 225 



Kaleidoscope 338 

 Kinematics of vibrations and 



wave-motions 505 

 Kinetic theory of gases 43 



theory of sound 525 

 Kundt's dust-figures 520 



Lamps 429 



for microscope 314 

 Law of emission of radiation 



444 



Laws of cooling 233 

 Le Bon's dark light 481 

 Lecture apparatus and experi- 

 ments 33 

 Lectures 30 

 Length, standards 89 

 Lengths, measurement 94 

 Lenses 301 



photographic 331 



spectacle 489 



systems 302 

 Light 354 



aberration 356 



filters 393 



intensity 278 



and invisible radiation, 

 general 273 



mechanical equivalent 355 



nature 273 



polarised 414 



sources 428 



units 284 



velocity, measurement 355 

 Lighthouses 337 



illuminating apparatus 336 

 Lightning, photography of 450 



spectra 431 



Limits of audition 542 

 Lippmann's interference me- 

 thod of colour photo- 

 graphy 361, 451 

 Liquefaction of gases and 



gaseous mixtures 207 

 Liquid films 59 



mixtures, vapour pressure 

 219 



surfaces 59 

 Liquids, compressibility 143 



compressibility, measure- 

 ment 143 



density, measurement 111 



