Gambar halaman
PDF
ePub

89

91

93

[blocks in formation]
[blocks in formation]
[blocks in formation]

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.

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..

Irrigation: Definition of Technical Terms.

148

Carrying Capacity of Pipes......

151

Flow of Water through Straight Pipes....

151

Power Required to Raise Water 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.

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.

158

Tractive Power of Horses at Different Speeds..

158

Effect of Inclination on Tractive Force..

159

Effects of Surface on Tractive Force....

160

[blocks in formation]
« SebelumnyaLanjutkan »