Duration of work = l day of 8 to 10 hours.

Description of Work

Mean Effect in Lbs.

Velocity in

Feet per Minute.

Lbs. Raised 1 Foot

High per Minute.

Lifting weights by hand breast high .

40

25

1,000

Raising water from a well by a bucket

30

35

1,050

Lifting a weight by a rope and overhead tackle......

40

30

1,200

Working a hand pump...........

30

60

1,800

Drawing a canal boat............

12

160

1,920

Working a ship's capstan.........

25

100

2,500

Turning the crank of

15

200

3,000

Rowing a boat.....

40

80

3,200

The efforts in the above table, although extending over 8 or 10 hours, exclusive of mealtimes, per day, are not altogether continuous, but include the usual intervals of rest or diminished exertion peculiar to each class of work.