4. If air type, a narrow floor nozzle so designed as to clean by small
amount of air at high velocity.

5. If air and brush (geared to wheels) type, a broader nozzle with
inset brush is permissible provided care is exercised in design to
prevent air leakage. This type cleans by a larger volume of air with
correspondingly lower velocity.

6. Durable construction, either aluminum or steel casings, an assembly
that secures tight joints and seams that won't leak air.

7. Easy operation--weight of appliance not so important if weight is
easily handled.

8. Convenient switch; handle designed long enough for comfortable
operation at woman's height.

9. Bag, double seamed; strong, tight connections; easily emptied;
durable material, preferably of cotton flannel type.

10. Winding posts for cord to be strong and conveniently placed.

11. Convenience in connecting attachments.

12. Elimination of noise, in so far as this is possible.


Instead, then, of attempting merely to learn the dealer's demand for
selling points, put part of your effort into learning the demands of
the user of the machine. Consumer suggestion or demands are apt to come