ABSORBING power,37— and radiating power,38Absorption, spectra,34— by glass and quartz,77— by air,78Addition of waves,25Amplitude,23BALMAIN, luminous paint,59Boltzmann, laws of radiation,48CONVECTION currents,67Corpuscular theory,10— reflection and refraction by,11Crookes' radiometer,67DEWAR, temperature and phosphorescence,62Diffraction grating,72— dispersion by,75— wire grating,77Dispersion,29,75Doppler effect,69EFFICIENCY in lighting,52Elastic solid theory,17Electric field,18Electric charges within the atom,21Electric oscillations,19,83Electrification, positive and negative,18Electromagnetic induction,80Electromagnetic waves,17,84Electrons,30Energy in simple wave,25Energy—wave-length curve,27FLUORESCENCE,58— theory of,60Foucault, speed of light in different media,17Fourier's series of waves,26,30Fraunhöfer lines,35Full radiator and absorber,44,45GASES as radiators,42HUYGHENS' wave theory,13Hertz, experiments on electric waves,85— reflection,86— refraction,87— wave-length by stationary waves,88INFRA-RED rays,32Interference,13KIRCHOFF'S law,40LANGLEY, Bolometer,32,48,49,77Lebedew, pressure of light,65Lummer and Pringsheim, law of radiation,48,50MAGNETIC oscillations,20Maxwell, electromagnetic theory,17— pressure of light,64Momentum of moving electric field,81NEWTON, dispersion,29— corpuscular theory,12— law of cooling,46Nichols, Rubens and, Rest-strahlen,79Nicholls and Hull, pressure of light,64,68PFLÜGER, emission from tourmaline,43Phase,22Phosphorescence,59— chemical theory of,61— temperature and phosphorescence,62Planck, energy and wave-length,51Polarised light, emission from tourmaline,42Pressure of light, prediction of by Maxwell,64— measurement by Lebedew,65— measurement by Nicholls and Hull,64,68— on the earth,68— on fine dust,69— on comets' tails,69— three effects of in astronomy,70Prévost, Theory of Exchanges,46RADIATING power,38Radiometer action,67Reflection, corpuscular theory,11— of electric waves,87Refraction, corpuscular theory,11— of electric waves,87Resonance,30Rest-strahlen or residual rays,79Ripples on mercury,13Ritchie, radiating and absorbing powers,38Rowland, gratings,73Rubens and Kurlbaum, proof of Planck's law,51Rubens and Nichols, Rest-strahlen,79SCHUMANN waves,78Simple harmonic motion, simple periodic motion,24Spark discharge,84Spectrometer,76— reflecting,78Spectrum,29— the whole,32— incandescent solid or liquid,33— incandescent gas,33— analysis,34— emission and absorption,34— sun,35— stars and nebulæ,36— and temperature,48Stationary waves,88Stefan, law of radiation,47TEMPERATURE, absolute,56— of planets,54— of space,55— of sun,53ULTRAVIOLET rays,32,77WAVE form,24Wave-length,22— range of,80— of electric waves,90Wave theory, rectilinear propagation,13Wien, Law of Radiation,50YOUNG, interference,16
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