vi CONTENTS 



PAGES 

 Distillation. Latent Heat. Conduction. Convection. 



Kadiation and the Ether. Cooling of Bodies. Artificial 

 Cold. Transformation of Energy. Heat as a Source of 

 Mechanical Energy. Heat Engines . 67-90 



CHAPTER V 

 SOUND 



Wave Motion. Vibration. Sound explained. Sound Waves. 

 Echoes. Forced and Sympathetic Vibration. Resonance. 

 Tones and Noises. Loudness. Pitch. Quality. Voice . 91-107 



CHAPTER VI 

 LIGHT 



Radiation and Light Waves. Luminous and Illuminated 

 Bodies. The Ether. Transparent, Translucent, and 

 Opaque Substances. Shadows. Reflection; Mirrors. 

 Refraction. Prism and Lenses. Formation of Images. 

 The Eye; Camera; Microscope; Telescope. Color. 

 White Light. Spectrum. Absorption. Color of Objects. 108-128 



CHAPTER VII 

 ELECTRICITY 



Production and Control of Electrical Energy. Electrical 

 Effects. Potential and Electro-Motive Force. Elec- 

 tric Charges. Electrostatic Induction. Discharges. 

 Lightning. Electric Current. Voltaic Cell. Circuit. 

 Resistance. Batteries ; Uses of Current. Electrical 

 Measurements. Magnets. Magnetic Poles. Magnetism 

 of the Earth ; Compass. Induced Currents. Dynamo. 

 Transformer. Induction Coil. Uses of Electrical Energy: 

 Motor ; Cars ; Telephone ; Telegraph ; Electroplating ; 

 Lights ............. 129-169 



