met by the new manufacturer. It is a patchwork, only, that is obtained
by one common method used to obtain a newly designed machine. Namely,
the manufacturer purchases every type of machine, already marketed to
perform a given work, and adapts one part from one machine, another
part from a second machine and perhaps still another part from a third
machine. Such a design must always be a compromise, and it is seldom
possible to obtain the original working efficiency of the several parts
in the new machine because of the necessary compromises.

A second point that the manufacturer is apt to overlook is the
importance of including the most minute of details in his general high
standard of manufacture. For instance, he elects to use copper for a
water container, but forgets to provide that every bolt and rivet and
screw, no matter how small, shall be of a rust-resisting metal. The
small part capable of rusting is as much an eyesore to the purchaser
and in certain conditions can do as great damage as though the
manufacturer had not spent the major sum to insure his rust-resisting
container.

And a third point: sometimes a manufacturer neglects to make certain of
a perfection of detail in the factory that will produce one hundred per
cent. of uniformity in his product. Thus vacuum cleaner manufacturers,
merely by installing an equipment that would measure for them, under
actual conditions of service, the correct air displacement of the
particular machine tested, could eliminate any possibility of lack of
uniformity in their product. Further, it would take no more time for
the inspection than is at present accorded to the routine reading of
current consumption. Yet up to this time we know of no vacuum cleaner
factory that has installed this comparatively simple and inexpensive
equipment.