234. Different types of sewing machines. 235. Lock-stitch sewing machine. 236. Feed plate. 237. Bobbins. 238. Shuttle bobbins. 239. Chain-stitch machine. 240. Cautions for all machines. 241. General instructions. CHAPTER XXXIV. AUTOMOBILES 192 242. Starting the motor. 243. Driving the automobile. 244. Care of car. CHAPTER XXXV. LAWN MOWERS; INCUBATORS 195 245. Operation and care of lawn mowers. 246. Storing mowers. 247. Scissors and shears. 248. Principles upon which incubator works. 249. The body of the incubator. 250. Incubators heated by a lamp. 251. The wick. 252. Thermostat. 253. The thermometer. 254. Operation of incubator. 255. Egg tester. CHAPTER XXXVI. TYPEWRITERS 202 256. Construction of typewriter. 257. Special features of typewriter. 258. Interchangeable-type typewriters. 259. Care of typewriters. 260. The hectograph. 261. Mimeograph and multigraph. PART X. MOTORS, FUELS AND GAS PLANTS CHAPTER XXXVII. TREADLES AND WATER MOTORS 209 262. Definition of motor. 263. The treadle. 264. Water motors. 265. Selecting a water motor. 266. Two types of water motors. CHAPTER XXXVIII. ENGINES; MOTORS AND BATTERIES; FUELS 212 267. Gasoline engines. 268. Figuring speed of pulleys. 269. Operating the engine. 270. Points in caring for engine. 271. Generating electricity for homes. 272. Batteries. 273. Liquid batteries. 274. A dry-cell battery. 275. Storage batteries. 276. Some uses for electric motors. 277. Definition tables. CHAPTER XXXIX. GAS PLANTS 220 278. Gasoline gas plants. 279. Acetylene-gas plant. 280. Directions for operating acetylene plant. 281. Cautions to be observed in using acetylene gas. 282. Compressed gases and oils. PART XI. MEASURING DEVICES CHAPTER XL. SCALES FOR WEIGHING 225 283. Equal-arm balances. 284. Unequal-arm balances. 285. Spring scales. CHAPTER XLI. DEVICES FOR MEASURING VOLUME 227 286. Graduate and measuring cup. 287. Tablespoons. 288. Teaspoons. 289. Standard measuring spoons. 290. Liquid and cooking measures. 291. Dry measures. 292. Cubic, square and linear measures. CHAPTER XLII. GAS, WATER AND ELECTRIC METERS 230 293. Different kinds of meters. 294. Construction of a gas meter. 295. Reading the gas meter. 296. Water meters. 297. Prepayment meters. 298. The electric meter. CHAPTER XLIII. THERMOMETERS AND THERMOSTATS 233 299. Mercury thermometers. 300. Oven thermometer. 301. Maximum thermometers. 302. Thermostats. CHAPTER XLIV. HYDROMETERS AND BAROMETERS 237 303. Hydrometer. 304. Hygroscopes. 305. Barometers. PART I COOKING STOVES CHAPTER I WOOD AND COAL STOVES