Data on Water Continued 183Data on Water Continued 184

Fig. 21. - Diagram to show power developed by 14-foot windmill, with different loads in different velocities.

Figures in the right-hand column are pounds (Fuller).

Data on Water Continued 185Data on Water Continued 186

Fig. 22. — Diagram to show speed of wheel of 14-foot windmill in different wind velocities with different loads.

Figures at ends of curves are pounds (Fuller).

Loading and speed of 14-foot power windmill when developing its maximum power (Fuller)

Wind Velocity — Miles per Hour

Horse-power

Speed of Wheel —

Revolutions per

Minute

Load in Pounds per Stroke

0-5.....

0.01

2.0

 

6-10.....

0.27

20.0

4.35

11-15 .....

0.85

29.5

10.35

16-20 .....

1.80

38.0

14.20

21-25 .....

3.45

45.0

26.35

26-30 .....

4.82

51.0

29.20

31-35 .....

5.60

55.0

31.00

Sizes of circular reservoirs and estimated cost for various areas of land to be irrigated from windmills (Fuller)

The following table gives the dimensions of circular reservoirs of different capacities ; the quantities of earth in the embankments, if these have inside slopes of three to one and outside slopes of one to one ; the areas which can be irrigated, provided the reservoir full of water is used once in ten days throughout five months and the land receives water to a depth of one foot ; the sizes of mills recommended, and the costs of reservoirs and mills. The lift assumed in choosing the mills is 14 feet: —

Data on Water Continued 187

Not including well.

Average cost of windmills of different sizes, and areas irrigated by them in

Colorado (Fuller)

Number of Mills

Size of Mills

Average Cost

Average Area

18......

8

$102

0.7

12......

10

198

1.8

9......

12

195

2.4

8......

14

265

3.8

2......

16

188

3.6