X CONTENTS. 



SECTION II. 



Pulverizers 141 



The Harrow 141 



Cultivators 143 



Clod-crushers 146 



SECTION III. 



Sowing-machines 148 



Horse Rakes 152 



Mowing and Reaping Machines 156 



SECTION IV. 



Knee-joint Power 159 



Endless-chain Powers 164 



SECTION V. 

 Application of Labor 167 



SECTION VI. 

 Models of Machines 173 



PART II. 



HYDRODYNAMICS. 

 CHAPTER I. 



HYDROSTATICS. 



SECTION I. 



Upward Pressure 176 



Measurement of Pressure at different Heights 178 



Detennining the Strength of Pipes 179 



Springs and Artesian Wells 179 



SECTION II. 



Determining Pressure on Surfaces 180 



Hydrostatic Bellows 183 



Hydrostatic Press 184 



SECTION III. 

 Specific Gravities 187 



CHAPTER n. 



HYDRAULICS. 



SECTION I. 



Velocity of falling Water 189 



Discharge of Water through Orifices and Pipes 1 90 



