INDEX 



361 



Purification of water, 77, 196. 

 Push button, 321. 



Radiator, 19-21. 



Railroads, grading of, 165-166. 



Rain, 36, 37. 



Rainbow, 134. 



Rain water, 225. 



Reflection, angle of, 110. 



of light, 109-112. 



of sound, 278, 279. 

 Refraction, angle of, 114. 



by atmosphere, 114. 



of light, 113. 



uses of, 115-116. 

 Relay, telegraph, 325. 

 Reservoir, 214. 



artificial, 211. 



construction of, 214-216. 



natural, 211. 

 Resistance, electrical, 312. 



internal, of cell, 343. 



unit of, 345. 

 Resonance, 276. 



River, volume and value of, 180. 

 Roads, application of inclined plane 



to, 165-166. 

 Rochelle salt, 227, 231. 

 Rocks, effect of freezing water on, 

 42-43. 



water as a solvent, 71. 

 Rosin, obtained by distillation, 35. 



Safety matches, 47-48. 

 Salicylic acid, 253. 

 Salt, 227-228. 

 Salts, 227. 



general properties, 227. 



in ocean, 227. 



smelling, 222. 

 Saturation of air, 37. 

 Scale, musical, 282. 

 Screw, and inclined plane, 166. 

 Seaweed, 265. 

 Seidlitz powder, 231. 

 Self-raising flour, 231. 

 Sewage, disposition of, 198-199. 



of camps, 196. 



source of revenue, 201. 

 Sewer gas, 57. 

 Silk, bleaching, 241. 



dyeing, 245-247. 



Silver chloride, 127-131. 

 Simple colors, 138. 

 Simple substances, 103. 

 Siren, 280. 

 Smelling salts, 222. 

 Snow, 36-37. 

 Soap, 222-224. 



and hard water, 225. 



liquid, 223-224. 



preparation, 223. 

 Soda, baking, 227, 228-229. 



benzoate, 253. 



caustic, 218, 222, 223, 227. 



washing, 225,- 226, 229. 

 Soda mints, 231. 



Sodium, bicarbonate, 56, 227, 228, 

 230-231. 



carbonate, 228. 



chloride, 228. 



Soil, deposited by streams, 73. 

 Solenoid, 318. 

 Solution, 70. 

 Soothing sirup, 258. 

 Sound, and motion, 266, 278. 



musical, 278. 



nature of, 266. 



reflection, 277. 



speed of, 271-272. 



transmission of, 267271. 



velocity of, 271-272. 



waves, 272-274. 

 Sounder, telegraph, 324. 

 Sounding board, 277. 

 Sour milk in cooking, 230. 

 Specific heat, 28-29. 

 Spectrum, 134-135. 

 Speed, of sound, 271, 272. 

 Spontaneous combustion, 52. 

 Stains, removal of, 226, 243. 

 Standpipes, 212. 

 Starch, 65. 

 Steam, and work, 183-184. 



engine, 183-185. 



heat of vaporization, 32. 



heating by, 33. 



turbine, 183-184. 

 Steel, forging and annealing, 16. 

 Stoves, 18-19. 

 Streams, carriers of mud, 73. 



volume of, 179-180. 

 Street cars, electric, 337. 

 Stringed instruments, 284-295. 



