0.42 equals 252 minutes under load.
252 minutes divided by 1156 pigs equals 0.22 minutes per pig under
load.

A pig-iron handler walks on the level at the rate of one foot in 0.006
minutes. The average distance of the piles of pig iron from the car was
36 feet. It is a fact, however, that many of the pig-iron handlers ran
with their pig as soon as they reached the inclined plank. Many of them
also would run down the plank after loading the car. So that when the
actual loading went on, many of them moved at a faster rate than is
indicated by the above figures. Practically the men were made to take a
rest, generally by sitting down, after loading ten to twenty pigs. This
rest was in addition to the time which it took them to walk back from
the car to the pile. It is likely that many of those who are skeptical
about the possibility of loading this amount of pig iron do not realize
that while these men were walking back they were entirely free from
load, and that therefore their muscles had, during that time, the
opportunity for recuperation. It will be noted that with an average
distance of 36 feet of the pig iron from the car, these men walked about
eight miles under load each day and eight miles free from load.

If any one who is interested in these figures will multiply them and
divide them, one into the other, in various ways, he will find that all
of the facts stated check up exactly.]

To go into the matter in more detail, however: As to the scientific
selection of the men, it is a fact that in this gang of 75 pig-iron
handlers only about one man in eight was physically capable of handling
47 1/2 tons per day. With the very best of intentions, the other seven
out of eight men were physically unable to work at this pace. Now the