A vacuum cleaner is a portable electrical appliance that cleans with the aid of suction. The first
vacuum cleaner was an industrial device powered by a petrol engine, patented by Hubert Booth in Britain in 1901. Portable electric vacuum cleaners were developed in the USA, the first being marketed by William Hoover in 1908. Cylinder vacuum cleaners were first made in Stockholm, Sweden, in about 1913. A cylinder vacuum cleaner contains a motor-driven suction fan that creates a partial vacuum inside the machine. Air is drawn in through a flexible hose fitted with various hand tools used to loosen debris from the surface being cleaned. The debris is then filtered from the air stream by a fabric or disposable paper bag. An upright vacuum cleaner contains a cylindrical ' beater bar', fitted with small brushes to loosen the dirt, in addition to the vacuum action. Some
vacuum cleaners are combinations of these two designs, and others employ detergent sprays for cleaning heavily soiled carpets. Research Vacuum Cleaner
Abbreviations
Research Vacuum Cleaner
