The difficulty from a mathematical standpoint of obtaining a rapid and
accurate solution of this problem will be appreciated when it is
remembered that twelve independent variables enter into each problem,
and that a change in any of these will affect the answer. The
instruction card can be put to wide and varied use. It is to the art of
management what the drawing is to engineering, and, like the latter,
should vary in size and form according to the amount and variety of the
information which it is to convey. In some cases it should consist of a
pencil memorandum on a small piece of paper which will be sent directly
to the man requiring the instructions, while in others it will be in the
form of several pages of typewritten matter, properly varnished and
mounted, and issued under the check or other record system, so that it
can be used time after time. A description of an instruction card of
this kind may be useful.
After the writer had become convinced of the economy of standard methods
and appliances, and the desirability of relieving the men as far as
possible from the necessity of doing the planning, while master mechanic
at Midvale, he tried to get his assistant to write a complete
instruction card for overhauling and cleaning the boilers at regular
periods, to be sure that the inspection was complete, and that while the
work was thoroughly done, the boilers should be out of use as short a
time as possible, and also to have the various elements of this work
done on piece work instead of by the day.
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