A mechanical horse power is 33,000 pounds elevated one foot per minute, and is equal to elevating 3,957 gallons of water one foot per minute.

Animal-Power

Animal-Power ; working eight hours per day, in pounds raised one foot per minute

Horse or mule, large - 22,000 Man, as in rowing - - 4,000

Horse or mule, small - - 18,000 Man, on tread-wheel - 3,100

Ox, average .... 12,000 Man, turning a crank - 2,600

Ass, average.....3,500 Mechanical Horse-Power 33,000

Horse-Power, Belting will Transmit with Safety

Width of Belt in Inches

Horse-Power, per 100 feet Velocity of Belt

Width of Belt in

Inches

Horse-Power per 100 feet Velocity of Belt

Belt Single

Double Belt

Single Belt

Double Belt

1

.09

.18

12

1.09

2.18

2

.18

.36

14

1.27

2.55

3

.27

.55

16

1.45

2.91

4

.36

.73

18

1.64

3.27

5

.45

.91

20

1.82

3.64

6

.55

1.09

22

2.00

4.00

7

.64

1.27

24

2.18

4.36

8

.73

1.46

28

2.55

5.09

9

.82

1.64

32

2.91

5.82

10

.91

1.82

36

3.27

6.55

11

1.00

2.00

40

3.64

7.27

Horse-Power

The following table shows the indicated horse-power for each pound average pressure on a square inch for different diameters and speeds of pistons.

Diameter of Cylinder

Inches

Speed of Piston in

Feet a Minute

240

300

400

500

600

4

.091

.114

.152

.19

.228

4 1/2

.115

.144

.192

.24

.288

5

.144

.18

.24

.30

.36

5 1/2

.173

.216

.288

.36

.432

6

.205

.256

.342

.428

.513

6

.245

.307

.409

.512

.614

7

.279

.348

.466

.583

.699

7 1/2

.321

.401

.534

.669

.802

8

.365

.450

.608

.761

.912

81/2

.413

.516

.688

.86

1.032

9

.462

.577

.77

.963

1.154

91/2

.515

.644

.859

1.074

1.288

10

.571

.714

.952

1.190

1.428

10 1/2

.63

.787

1.050

1 313

1.575

11

.691

.864

1.152

1.44

1.728

11 1/2

.754

.943

1.257

1.572

1.886

12

.820

1.025

1.366

1.708

2.050

13

.964

1.206

1.608

2.01

2.412

14

1.119

1.398

1.864

2.331

2.797

J5

1.285

1.606

2.131

2.671

3.212

16

1.461

1.827

2.436

3.045

3.654

17

1.643

2.054

2.739

3.424

4.108

18

1.840

2.312

3.083

3.854

4.624

29

2.061

2.577

3.436

4.295

5.154

20

2.292

2.855

3.807

4.759

5.731

21

2.518

3.148

4.197

5.247

6.296

22

2.764

3.455

4.607

5.759

6.911

23

3.021

3.776

5.035

6.294

7.552

24

3.209

4.111

5.482

6.853

8.223

25

3.569

4.461

5.948

7.436

8.923

26

3.861

4.826

6.435

8.044

9.052

27

4.156

5.199

6.932

8.666

10.399

28

4.477

5.596

7.462

9.328

11.193