Vm TABLE OF CONTENTS. 



PAGE 



Trade Values of Fertilizing Ingredients in Raw Materials and 



Chemicals, 1899 137 



Conversion Table for Calculating Fertilizing Ingredients 138 



XI. AGRICULTURAL ENGINEERING. 



Drainage: Reasons for Tile-draining Land 139 



Number of Rods and of Tiles per Acre, with Drains at Various 



Distances Apart 140 



Size of Tiles Required for Draining under Average Conditions 140 



Table of Size of Tile Pipe of Main Drain 141 



Rule for Obtaining Size of Main Pipes 141 



Number of 12-inch Pipes Required per Acre at Different Dis- 

 tances between the Drains '141 



Number of Acres which a Tile of a Given Diameter and per 



Cent Grade will Drain when Used as an Outlet 142 



Rise of the Slope for 100 Feet 143 



Quantity of Earth Removed per Rod of Drains of Various 



Dimensions i_;3 



Rainfall 144 



Windmills: Table Showing the Force and Velocity of Wind 145 



Number of Square Feet and Acres Irrigated by Windmills of 



Different Sizes 145 



Table Showing Capacity of Windmills 146 



Table Showing Economy of Windmills 147 



Nominal Horse-power Required for the Discharge of Given 



Quantities of Water with Lifts of 10 and 20 ft 148 



Irrigation : Definition of Technical Terms 148 



Carrying Capacity of Pipes 151 



Flow of Water through Straight Pipes 151 



Power Required to Raise W^ater from Deep Wells by Pumping 152 

 Approximate Cost of Different Kinds of Pipe used for Irriga- 

 tion 152 



Average Cost per Mile of Constructing Irrigating Canals and 



Ditches 152 



Capacity of Windmills and Pumps 153 



The California Weir Table 154 



Capacity of Cisterns and Tanks 154 



Capacity of Cisterns in Barrels, per Foot in Depth 155 



Roads: Road-making 155 



Importance of Good Roads 157 



Tractive Force Required for Carriages 157 



Fraction of the Weight of a Vehicle and Load Required to 



Move Same on a Level Road 15S 



Tractive Power of Horses at Different Speeds 158 



Effect of Inclination on Tractive Force 159 



Effects of Surface on Tractive Force 160 



