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CONTENTS 



PART IV— ROADS 



Chapter Page 



XXIII. Importance of Roads 141 



XXIV. Earth Roads 147 



XXV. Sand-Clay and Gravel Roads .... 153 



XXVI. Stone Roads 160 



XXVII. Road Machinery * 167 



XXVIII. Culverts and Bridges 175 



PART V— FARM MACHINERY 



XXIX. The Relation of Farm Machinery to Agricul- 

 ture 180 



XXX. Definitions and Principles .... 186 



XXXI. Materials 195 



XXXII. The Plow 199 



XXXIII. Harrows, Pulverizers, and Rollers . . 211 



XXXIV. Seeders and Drills 223 



XXXV. Corn Planters 231 



XXXVI. Cultivators 237 



XXXVII. The Grain Binder or Harvester . . . 244 



XXXVIII. Corn Harvesting Machines 251 



XXXIX. Hay-Making Machinery 258 



XL. Machinery for Cutting Ensilage .... 273 



XLI. Threshing Machines 278 



XLII. Fanning Mills and Grain Graders . . . 282 



XLIII. Portable Farm Elevators 287 



XLIV. Manure Spreaders . . . . . . . 292 



XLV. Feed Mills and Corn Shellers . . . 298 



XLVI. Spraying Machinery 303 



XLVII. The Care and Repair of Farm Machinery . 309 



PART VI— FARM MOTORS 



XLVIII. Elementary Principles and Definitions . . 313 



XLIX. Measurement of Power 316 



L. Transmission of Power 320 



LI. The Horse as a Motor 327 



LII. Eveners 334 



LIII. Windmills 339 



LIV. The Principles, of the Gasoline Engine . . 344 



