Safety demands that every equipment involving an electric motor be so fully insulated from the machine frame by water-proof fittings and insulated shaft couplings, etc., that a maximum of safety can be assured. It is indeed remarkable that this is not more often cared for in the original design. In one short period, at least three machines were forced into the disapproval group in the Department of Household Engineering of Good Housekeeping Institute with such lack of insulation as one of the causes. It is thus clear that consumer needs, in this great classification of merchandise (household appliances) as reflected by consumer attitude are often ill-defined and extremely difficult for the manufacturer to interpret. Therefore, as a recognition of this condition, the basic purpose running throughout all of the testing work at Good Housekeeping Institute is to test every device so as to duplicate the conditions under which the device will be used by the ultimate consumer, be she intelligent or unintelligent. It has furthermore been the Institute's special province to express to each manufacturer the trend of consumer demand as seen, not only through the Institute's use of appliances, but through the thousands of consumers who report their experiences. It is an interesting and surprising fact that mechanical tests develop data which often interpret the results obtained under practical usage of the equipment, and the results obtained under the practical usage quite as often define the value of the mechanical data. Any effort a manufacturer may make to develop these two angles of testing will more than offset any money cost that may be added to the factory overhead. Complete testing of this character will also save ultimate consumer reactions against the completed manufactured product. It is not enough, as so many manufacturers have done, to place the appliance in a variety of homes and take the consequent "say-so." It must be remembered that it is only possible to compare an appliance when you have something to compare it with, and that something must be an appliance designed to do similar work. How many instances are there where manufacturers allow their products to go out without comparative information of this kind, just because such information is so extremely difficult to get? To all interested in or concerned with this great industry, there is one thing to be remembered above all else--study and test not only the mechanical construction and perfection of your product but know from every conceivable angle what the user or consumer is going to demand of it. If this be done, and done thoroughly, and exhaustively, you will build the appliance of the best materials obtainable, because it must wear well; of the most efficient design, because it must operate smoothly; and you cannot fail to so build it that it will do its work completely and well because you will have the measure of these values within the experience of your own investigation.