236 



INDEX 



Retina, 121. 

 Reverberation, 98. 



Salts, 185, 186, 188, 219. 



Saturation, 76, 189. 



Screw, 49, 64. 



Series arrangement, 146. 



Shadows, 111. 



Shunts, 145. 



Sight, far, 122 ; near, 122. 



Silicon, 201. 



Silver, 200. 



Siphon, 39. 



Smoke, 7, 224. 



Soap, 208. 



Sodium, 199; compounds, 199. 



Soil, 211. 



Solidifying, 74. 



Solids, 5, 7. 



Solutions, 189. 



Solvents, 189, 190. 



Sound, definition of, 92, 93 ; loud- 

 ness of, 102 ; musical, 105 ; ori- 

 gin of, 94. 



Sound waves, 93, 164 ; reflection 

 of, 97; transmission of, 97; 

 velocity of, 97. 



Specific gravity, 21, 22, 29. 



Spectrum, 126, 127. 



Speech, 106. 



Stability, 54. - 



Starch, 189, 206, 207. 



Static electricity, 135. 



Steam, 7, 8; engine, 88; loco- 

 motive, 89; turbine, 89. 



Steel, 198. 



Substances, kinds of, 172. 



Sugar, 16, 189 ; cane, 207 ; grape, 

 207. 



Sulphates, 186, 204. 

 Sulphides, 187, 188. 

 Sulphur, 187, 196. 

 Sulphuric acid, 195, 204. 

 Surface level, 25. 

 Symbols, 181. 

 Sympathetic vibration, 99. 



Telegraph, 165 ; wireless, 169. 



Telephone, 164. 



Telescope, 123. 



Temperature, 69. 



Tenacity, 14. 



Theory, atomic, 176; molecular, 



9 ; of heat, 68. 

 Thermal effect, 131, 167. 

 Thermometer, 69, 70. 

 Tin, 200. 

 Tinctures, 190. 

 Tones, 101 ; differences in, 102 ; 



loudness of, 102 ; musical, 102, 



104, 105 ; pitch of, 103 ; quality 



of, 104. 

 Transformation of energy, 86, 



87. 



Transformer, 159. 

 Translucent bodies, 111. 

 Transmission, of fluid pressure, 



30; of sound waves, 96. 

 Transparency, 110. 

 Turbine, steam, 89. 

 Type metal, 188. 



Umbra, 112. 



Units of electrical measurement, 

 146. 



Vacuum, 33, 34. 

 Vapor, 7. 



