. . .nd 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.

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