234 



INDEX 



Impenetrability, 10. 



Incandescent lamp, 167. 



Inclined plane, 65. 



Induction, coil, 160 ; coil, use of, 

 161; electrostatic, 136; mag- 

 netic, 160. 



Inertia, 17, 47, 50. 



Insulators, 130, 134. 



Iron, 198 ; rust, 226. 



Kerosene, 188, 194, 217. 



Lamp, arc, 168; incandescent, 

 167. 



Latent heat, 77. 



Law, natural, 3 ; of floating bod- 

 ies, 28 ; of gravitation, 20 ; of 

 machines, 62 ; of magnets, 152, 

 153 ; of motion, 46 ; of reflec- 

 tion, 113. 



Lead, 200. 



Lens, 120, 121, 122 ; effects of, 121, 

 122 ; focus of, 120 ; glass, 213. 



Lever, 61, 63. 



Lifting pump, 37. 



Light, 108 ; rays, 109. 



Lights, electric, 167. 



Light waves, 108, 109, 110; color 

 of, 124 ; reflection of, 112, 114 ; 

 refraction of, 117, 119 ; velocity 

 of, 110. 



Lightning, 138. 



Lime, 199. 



Line of direction, 53. 



Lines of magnetic force, 148, 155, 

 160. 



Liquefied air, 86. 



Liquefying, 74. 



Liquid, 6, 7 ; level, 25 ; pressure, 

 24, 25, 30. 



Locomotive, air, 43; steam, 89. 

 Loudness, 102. 

 Luminosity, 109. 



Machines, 60, 61, 64; law of, 62. 

 Magnet, 147 ; electro-, 149 ; law 



of, 152 ; permanent, 151 ; poles 



of, 151. 

 Magnetic, action, 147, 152 ; effect, 



131, 147 ; field, 148 ; force, 147 ; 



induction, 160 ; lines of force, 



148 ; poles, 151 ; poles of the 



earth, 153. 



Magnetism of the earth, 153. 

 Malleability, 13. 

 Mass, 51 ; center of, 52. 

 Matches, 197. 

 Matter, 2, 4 ; composition of, 8 ; 



properties of, 10 ; states of, 5, 



6,7. 



Measurements, electrical, 146. 

 Mechanical uses of heat energy, 



89. 



Megaphone, 100. 

 Melting, 74. 

 Mercury, 9, 200 ; compounds, 



200. 



Mercury air pump, 42. 

 Metals, 80, 130, 184, 185, 188, 



200, 225. 

 Microscope, 122. 

 Mirror, 114. 



Mixtures, 173, 174, 180, 210. 

 Molasses, 207. 

 Molecular theory, 9. 

 Molecule, 8, 176, 180; vibration 



of, 68. 



Momentum, 50. 

 Motion, laws of, 46, 47, 48 ; wave, 



91. 



