Number of establishments.......

1,170

Steam boilers:

Fire tube -

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

35,802

Aggregate horsepower.......

1,943,222

Total value....................

$18,037,451

Water tube -

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

4,731

Aggregate horsepower.......

985,761

Total value................

$7,625,994

Steam engines:

Marine -

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

767

Aggregate horsepower.......

396,047

Total value................

$7,018,369

Fixed cut-off throttling -

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

21,806

Aggregate horsepower.......

658,111

Total value................

$7,963,805

High speed variable automatic

cut-off -

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

3,823

Aggregate horsepower.......

314,668

Total value.............................................

$3,282,787

Low speed variable automatic cut-off -

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

2,724

Aggregate horsepower.......

841,901

Total value................

$9,755,010

Internal-combustion engines:

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

18,531

Aggregate horsepower.........

164,662

Total value..................

$5,579,398

Overshot or undershot water wheels:

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

58

Aggregate horsepower.........

1,257

Total value..................

$12,250

Turbine water wheels:

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

1,665

Aggregate horsepower.........

311,527

Total value...............................

$1,232,090

Impact water wheels:

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

957

Aggregate horsepower.........

55,150

Total value..................

$276,509

Primary powers, all kinds:

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

50,331

Aggregate horsepower.........

2,743,323

Total value...............................

$35,120,218