Schedule of Classification 



3100 Transmission through Hete- 

 rogeneous Media. (See 

 also 3210.) 



342 



Spectrum Analysis, Apparatus for. 



3150 General 342-344 



Spectroscopes ... 343-344 

 Direct Vision Spectro- 

 scopes 343 



3155 Prisms 344-345 



3160 Gratings. (See also 3630.)... 345 

 Concave Gratings ... ... 345 



3165 Special Spectroscopic Appa- 

 ratus 345-346 



Spectroscopes ... ... 346 



Optics of the Atmosphere. 



3200 General 346-347 



Mirage 346-347 



3210 Atmospheric Refraction. 

 Scintillation. (See also 

 3100; Astronomy 0210, 

 5400 ; Meteorology 0520. ) 347-349 

 Atmospheric Refraction 347-349 

 Astronomical Refraction 347-348 

 Terrestrial Refraction 348-349 



Scintillation 349 



Stellar Scintillation ... 349 

 3220 Rainbows, Halos, etc. Co- 

 lours of Clouds. (See 

 also 3640.) (For obser- 

 vations see Meteorology 

 0540-0570.) ... 349-351 



Halos 349-350 



Rainbows 350-351 



3230 Colourand Polarisation of the 

 Sky. (See also 3640, 

 4010, Meteorology 0510, 



0520.) 351-352 



Colour 351 



Polarisation 352 



3240 Atmospheric Absorption. 

 (See also 3850 ; Astronomy 



5400.) 352-353 



3260 Energy of Sun-light. (See 

 also Astronomy 4200 ; 

 Meteorology 0930. ) ... 353 



Velocity, Wave-Length, etc., of 

 Radiation. 



3400 General. (See also 2990.) 353-355 

 Light 354-355 



3405 Radiation-pressure. Mechan- 

 ical Equivalent of Light. 

 (See 4210, 4215.) ... 355 



3410 Velocity of Light, Measure- 

 ments of 355-356 



3420 Aberration and Moving Me- 

 dia. Doppler's Principle. 

 (See also 6630 : Astronomy 

 3310.) 356-358 



PAGE 



Aberration ... 356-357 



Doppler's Principle ... 357 

 Moving Media ... 357-358 



3430 Wave-Length of Rays in the 

 Luminous Spectrum, 

 Measurement of. (See 

 also 3030.) ... 358-359 



Wave- Lengths ... 358-359 



3435 Wave- Length of Infra-Red 



Rays, Measurement of 359-360 

 3440 Wave-Length of Ultra- Violet 



Rays, Measurement of 360 



Interference and Diffraction. 



3600 General 360-361 



3610 Interference. Interferential 

 Refractometers. Colours 

 of Thin Sheets. (For In- 

 vestigation of Radiation 

 in a Magnetic Field by 

 Interference, see 6660 ; 

 for Nobili's Rings see 



6242.) 361-367 



Colour Photography. (See 



also 4225.) 361 



Lippmann's Interference 



Method 361 



Colours 361-362 



Interference ... 362-365 

 Achromatism in Interfer- 

 ence 362 



Bands 363 



Interferential Refractome- 

 ters 365 



Newton's Rings ... 366-367 



Talbot's Bands 367 



3620 Diffraction 367-370 



3630 Spectra formed by Diffrac- 

 tion and by Gratings ... 371 

 Diffraction Spectra ... 371 

 Gratings. (See also 3160.) 371 

 3640 Diffraction by Small Par- 

 ticles. Theory of Rain- 

 bow, Optical Resonance, 

 etc. (See also 3220 ; Me- 

 teorology 0550.) ... 371-372 

 3650 Definition of Optical Instru- 

 ments, General Theory. 

 (See also 3080, 3082.) 372-373 

 Microscopic Vision ... 373 



Reflection, Refraction and Absorption 

 of Radiation. (See also 3020, 3030.) . 



3800 General 373-374 



3810 Reflecting and Absorbing 

 Powers of Materials. 

 Irregular Reflection 374-375 



Refaction 374-375 



3820 Dynamical Theory of Reflec- 

 tion and Refraction 

 in Transparent Media. 



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