4. How does a mangle differ from a wringer?
5. What is the difference in care that should be given to a plain flat iron and an electric iron?
PART VII
House-Cleaning Equipment
CHAPTER XXVI
Vacuum Cleaners and Cleaning Tools
185. Principle Upon Which Vacuum Cleaner Works. The principle of a vacuum cleaner is that, thru suction, dust and dirt are drawn from the floor or other surfaces into some container. If the power of the cleaner is sufficient, it may pick up anything—but cleaners having a moderate amount of power are somewhat more discriminating. They do, however, remove the fine, greasy dirt that brooms, brushes and carpet sweepers fail to get. The coarser dirt and ravelings may be taken up by a carpet sweeper, with a brush, or picked up by hand. The brush is combined with the cleaner in many machines (Fig. 98).
