CONTENTS. 



PART L MECHANICS. 

 CHAPTER I. 

 Introduction. Value of Farm Machiner}- Importauce of a 



Kuowledge of Mechanical Principles 7-10 



CHAPTER 11. 

 General Principles of Mechanics. Inertia, Experiments and 

 Examples Inertia of Movino; Bodies, or Momentum Fast 

 Riding Tlie Tiger's Leap Pile Engines Fly-wheel Esti- 

 mating the Quantity of Momentum Compound Motion 

 Various Examples Centrifugal Force .- 10-22 



CHAPTER III. 

 Attraction. Gravitation Velocity of Falling Bodies Resist- 

 ance of the Air Coin and Feather Galileo's Famous Experi- 

 ment Cohesion Soils Strength of Materials Capillary 

 Attraction The Earth a Desert without it The Ascent of 

 Sap Centre of Gravity Experiments Upsetting Loads 

 Shouldering Bags Rocking Bodies 22-42 



CHAPTER IV. 



Simple Machines, or Mechanical Powers. Law of Virtual 

 Velocities The Lever Many Examples of Levers Esti- 

 mating the Power of Levers Three-horse Whiffle-tre.e 

 Compound Levers Weighing Machines Stump Pullers 

 A Wild Theory Wheel and Axle Examples Band and 

 Cog-work The Pulley Packer's Stone Lifter The Inclin- 

 ed Plane Crooked Roads Power of Locomotives Good 

 and Bad Roads The Wedge The Screw Knee-joint Pow- 

 er Lever Washing Machine Cheese Presses Rolling Mills 



Straw Cutters 42-74 



CHAPTER V. 



Application or Mechanical Principles in the Structure of 

 Implements and Machines Various Examples Calculating 

 the Strength of Parts 75-81 



CHAPTER VI. 

 Friction. How to a?eertain its Amount Friction on Roads- 

 Resistance of Mud The Results of the Dynamometer- 

 Width of Wheels Velocity Size of Wheels on Roads- 

 Friction Wheels Lubricating Substances Friction neces- 

 Bary to Existence 81-93 



CHAPTER VIL 

 Principles of Draught- Applied to Wagons To Plows Com- 

 bined Draught of Animals Whiffle-trees for Three Horses 

 4 



