x CONTENTS. 



CHAPTER XIV. 



PAOM 



GENERAL ACCOUNT OF RADIATION. 



Radiant Energy Radiometers Radiant Energy and Light resemble each other 

 Light is Radiant Energy to which the eye is sensitive Radiant Energy 

 has a much greater range of Wave-Length than Light Radiometers only 

 measure Energy Streams and do not indicate Quality Comparison of 

 Emissive Powers Radiation of different Wave-Lengths Comparison of 

 Absorptive Powers Comparison of Reflecting Powers Diffusion General 

 Results Radiating and Absorbing Powers vary together Illustrations 

 Transparency and Opacity Radiation and Absorption by Gases and 

 Vapours ..... 220-236 



CHAPTER XV. 

 THEORY OF EXCHANGES. 



Theory of Exchanges Uniform Temperature Enclosures Full Radiation 

 Propositions regarding Uniform Temperature Enclosures Bodies ex- 

 changing Radiation at different Temperatures Bodies in the same 

 Physical State continue to absorb the same kind of Rays independently 

 of Change of Temperature Radiation of every kind emitted by a Body 

 increases as the Temperature rises Application to Special Cases . . 237-243 



CHAPTER XVI. 

 RADIATION AND TEMPERATURE. 



Variation of Rate of Radiation with Temperature Newton's Law of Cooling 

 Dulong and Petit's Law Rosetti's Law Stefan's Law Constants of 

 Radiation Radiation from Surfaces which absorb selectively Rate of 

 Solar Radiation Solar Constant Pouillet's Pyrheliometer Violle's Actino- 

 meter Langley's Researches Crova's Researches Effective Temperature 

 of the Sun Source of Solar Energy 244-257 



CHAPTER XVII. 

 THERMODYNAMICS. 



The Second Law of Thermodynamics The Indicator Diagram Isothermals 

 Adiabatics or Isentropics Heat Engines Carnot's Reversible Heat Engine 

 Carnot's Cycle Conditions for Reversible Working Examples of Rever- 

 sible Processes Of Irreversible Processes Efficiency of an Engine 

 Absolute or Work Scale of Temperature Efficiency expressed on the 

 Absolute Scale Comparison of the Absolute with the Air Scale Water- 

 Wheel Analogue Reversible Cycles in general Entropy Entropy- 

 Temperature Diagram Quantities Analogous to Entropy Entropy tends 

 to increase Dissipation of Energy Intrinsic Energy Available Energy 

 Possible Efficiency of a Steam Engine 258-283 



