Schedule of Classification 



PAGE 



Illuminating Power 425-426 



Photophone (Radiophone) 426-427 



Radiation 427-428 



Heat. (For Reflection, 

 Refraction and Ab- 

 sorption of Heat Rays 



see 3855.) 427 



Heat and Light 427-428 



4202 Sources : Lamps, Arcs, 

 Vacuum Tubes. (See 

 also 3010, 6080.) 428-430 



Incandescent Lighting . . . 429 



Lamps 429 



Vacuum Tubes 430 



4205 Spectra. Distribution of 



Spectral Lines... 430-439 



Spectra of Elements 431-432 



Spectra of Oases 432 



Spectra of Metals . . . 432-433 



Spectra of Particular Sub- 

 stances. (See also 

 Chemistry 7320.) 433-438 



Carbon ... ' 434 



Hydrogen ... 435-436 

 Spectral' Lines, Distribu- 

 tion 438-439 



Spectrum Analysis ... 439 



4206 Influence of Pressure, Tem- 



perature, etc. on Spectra 440-441 

 Influence of Density ... 440 

 Influence of Pressure ... 440 

 Influence of Temperature 440-441 



4207 Structure of Spectral Lines 441 



4208 Influence of Magnetic Field on 



Spectra. (See also 6660. ) 44 1 -442 

 Zeeman Effect ... 441-442 



4210 Intensity and Distribution 

 of Energy. Temperature 

 and Radiation. Tem- 

 perature Law of Radia- 

 tion. Radiation of Black 

 Bodies. (See also Me- 

 teorology 0965, 0970.) 442-446 

 Emission ... ... ... 442 



Emissive Power ... ... 442 



Energy ... 443 



/Distribution in Spectrum 443 



Radiation 443-445 



Heat 444 



Law 444-445 



Theory of Exchanges . . . 445 

 Radiation of Black Bodies 445 



Spectra 446 



Temperature ... ... 446 



Temperature and Radia- 

 tion 446 



4215 Radiation-Pressure. (Seealso 



. 3405.) 446 



4220 Chemical Luminescence. (See 



also 6840.) ... 447-448 



Ignis fatuus ... ... 447 



PAGE 



4225 Photochemistry and Photo- 



graphy ...... 448-465 



Actinometry ... 448-449 



Sejisitometry ... ... 449 



Applications of Photo- 



graphy ... 449-450 



Lightning, Photography 



of ......... 450 



Spectrum Photography 450 



Colour Photography. (See 

 also Chemistry 7350, 

 7400.) ...... 451-452 



Lippmann's Interference 



4230 



Thermo- 



Photo- 



Method 

 Emulsion . . . 

 Exposure ... 

 Moser's Images. 



graphy ... 

 Negatives ... 

 Orthochromatic 



graphy . ..... 



Photochem istry . . . 



Specified Substances 

 Photographic Agents 



Developers 



Sensitisers 



Photographic Images 

 Photographic Processes 



Collodion 



Daguerreotype . . . 



Photography on Paper 



Printing Processes 

 Photography 

 Plates ...... 



Phosphorescence produced 



by Impact of Radiation, 



Heat, Electric Discharge, 



etc. Fluorescence. (See 



also 6840 ; Chemistry 



7305.) ...... 465-471 



Fluorescence ... 465-467 



Stokes' s Law ...... 467 



Particular Substances . . . 467 

 Fluorescence and Phos- 



451-452 

 452-453 

 453 



454 

 454 



454-455 

 455-457 

 456-457 

 457-459 

 457-458 

 458-459 



459 

 460-464 



460 

 460-461 



462 

 462-463 



464 

 464-465 



Phosphorescence ... 468-471 



Phosphorescent Spectra 469 



Production of Phosphor- 

 escence ... 469-470 

 Particular Substances 470-471 

 4240 Rontgen and allied Radia- 

 tions. (See also 6840, 

 6845, 6850.) ... 471-480 



Rontgen Rays ... 471-480 



Diffraction 473 



Emission ... ... 474 



Experiments ... ... 475 



Photography ... 476-477 



Tubes 479-480 



Rontgen Rays and Cathode 



Rays 480 



