INDEX 



233 



Elements, chemical, 173, 183; 

 symbols of, 182. 



Emery, 201. 



Energy, 68, 69; definition of, 3; 

 forms of, 5 ; from heat, 89 ; ra- 

 diant, 83; transformation of, 

 86, 87. 



Engine, compressed-air, 43 ; gaso- 

 line, 89; naphtha, 89; steam, 88. 



Equilibrium, 54. 



Essences, 190, 217. 



Ether, 82, 83, 110, 169. 



Evaporation, 75. 



Exciter for dynamo, 158. 



Expansion, 72, 73; of gases, 41. 



Explosion, 223. 



Explosives, 217. 



Eye, 121. 



Eyeglasses, 122. 



Fahrenheit thermometer, 70. 



Falling bodies, 56, 57. 



Fats, 208, 219. 



Fatty acids, 208. 



Fermentation, 227. 



Fire, 221, 224; engine, 39; ex- 

 tinguisher, 222. 



Flames, 223. 



Floating bodies, 28 ; law of, 28. 



Fluids, 23; pressure in, 24, 25, 

 30, 32. 



Focus, of lenses, 120, 122 ; of mir- 

 rors, 115. 



Fog, 76. 



Foods, 218. 



Foot pound, 60. 



Force, 4 ; pump, 38. 



Forced vibration, 98, 99. 



Friction as a source of heat, 67. 



Fuels, 219. 



Fulcrum, 63. 

 Fusion, 74. 



Gas, 6, 8; compression of, 15; 



expansion of, 41 ; illuminating, 



216. 



Gasoline engine, 89. 

 Gear wheels, 65. 

 German silver, 188. 

 Glass, 212. 

 Glucose, 207. 

 Gold, 9, 13, 200. 

 Gravitation, 19 ; law of, 20. 

 Gravity, 19, 20; cell, 143; center 



of, 52 ; specific, 21, 29. 

 Gun cotton, 218. 

 Gun metal, 188. 

 Gunpowder, 217, 218. 

 Gypsum, 199. 



Hardness, 12, 13. 



Harmony, 105. . . 



Heat, 67; effects of, 71; energy, 69; 



latent, 77; mechanical energy 



from, 87 ; sources of, 67 ; theory 



of, 68 ; transfer of, 79. 

 Horse power, 146. 

 Hydraulic, jack, 31 ; press, 30. 

 Hydrocarbons, 188, 217. 

 Hydrochloric acid, 197. 

 Hydrogen, 44, 183, 188, 189, 194, 



217, 219, 224. 

 Hydrometer, 29. 



Ice, artificial, 85. 

 Illuminating gas, 216. 

 Illumination, 109; intensity of, 



115. 

 Images, formed by a convex lens, 



121, 



