Pumps and Hydraulics, Part 2 (of 2)

by N. Hawkins

Table IV.

COMPARATIVE POWER OF BACK-GEARED MILLS.
Size of Mill	4-ft.	6-ft.	8-ft.	9-ft.	10-ft.	12-ft.	14-ft.	16-ft.
Horse-Power	1⁄12	1⁄5	3⁄10	2⁄5	3⁄5	1	13⁄5	23⁄5

Table V.

FORCE OF THE WIND IN POUNDS PRESSURE.
Velocity	Miles	8	10	12	15	20	25	30	40
Force	Pounds	1⁄3	1⁄2	3⁄4	1	2	3	41⁄2	8

Table VI.

POWER OF THE WIND.
Velocity per Hour.	Pressure per Sq. Foot.
10 Miles	1⁄2 Lb.
15 „	1 „
20 „	2 Lbs.
25 „	3 „

Table VII.

GROSS AND EFFICIENT POWER OF 12 AND 14 FOOT WINDMILLS.
SIZE OF MILL.	Velocity of Wind.	Gross Horse-power.	Net Horse-power.
12-Foot Ideal Power Mill	10 Miles	1⁄2	1⁄10
12 „ „ „ „	15 „	1	3⁄5
12 „ „ „ „	20 „	2	13⁄5
12 „ „ „ „	25 „	3	23⁄5
14 „ „ „ „	10 „	1	3⁄5
14 „ „ „ „	15 „	2	13⁄5
14 „ „ „ „	20 „	4	33⁄5
14 „ „ „ „	25 „	6	53⁄5

The preceding tables are based upon tests of the Sampson windmill as compiled by its makers, The Stover Manufacturing Co.; they deserve careful study by those planning the introduction of aermotors.