[Twelfth Census, Vol. VII, pages CCCXVI, and 582.]

Power.

Date of Census.

Per Cent, of Increase.

1900.

1890.

1880.

1870.

1890 to

1900.

1880 to

1890.

1870 to

1880.

Total number of establishments.

512,191

355,405

253,852

252,148

44.1

40.0

0.7

Total number of establishments reporting power................

169,364

100,726

85,923

(1)

68.1

17.2

Per cent of establishments reporting power to total number.................

33.1

28.3

33.8

Total horsepower.......................

11,298,119

5,954,204

3,410,837

2,346,142

89.8

74.6

45.4

Average horsepower per es-

66.7

59.1

39.7

29.3

12.9

48.9

326.9

Steam engines:

Number................

156,051

91,403

56,483

(1)

70.7

61.8

Horse power...................

8,741,338

4,581,305

2,185,458

1,215,711

90.8

109.6

79.8

Per cent of total horsepower......................

77.4

76.9

64.1

51.8

Gas engines:

Number................

14,884

(1)

(1)

(1)

Horsepower..................

143,850

8,930

(1)

(1)

1,510.9

Per cent of total horsepower...............

1.3

0.1

Water wheels:

Number................

39,168

39,005

55,404

(1)

0.4

329.6

Horsepower..................

1,726,661

1,255,045

1,225,379

1,130,431

37.6

2.4

8.4

Per cent of total horsepower...............

15.3

21.1

35.9

48.2

Electric motors:

Number................

16,912

(1)

(1)

(1)

Horsepower..................

310,729

15,569

(1)

(1)

1,895.8

Per cent of total horsepower.................

2.8

0.3

Other power:

Number.................

2,144

0)

(1)

(1)

Horsepower..................

54,490

4,784

(1)

(1)

1,039.0

Per cent of total horsepower.....................

0.5

0.1

Total rented horsepower.....

321,051

88,571

(1)

(1)

262.5

Per cent of total horsepower.................

2.8

1.5

Electric rented horsepower.

183,682

(4)

(1)

(1)

All other rented horsepower.........................

137,369

(4)

0)

(1)

1 Not reported. 2 Average for all establishments. 3 Decrease. 4 Not reported separately