VACUUM CLEANERS

are operating on the suction principle, for the removal of dust and dirt rugs, floors, furniture, fabrics, etc. A means of moving air, such as a fan, draws air through a hose to can be affixed various shaped appropriate to the use of the The air is exhausted to a bag of woven fabric, which permits the escape but retains any solid matter as dirt. The nozzle of the cleaner moved slowly over the surface cleaned. The air being drawn into nozzle carries with it any dirt in its path. This is subsequently out of the air and retained in the described above. The earlier types of machine hand driven and had reciprocating pumps. The electrically driven which replaced this older type, a fan or blower mounted directly the motor shaft. Three cla es of tric machines are now in use: (1) Portable, with nozzle permanently attached; designed to be run over surface to be cleaned. This may equipped with a brush, motor or automatically propelled, and a with appropriate nozzle. Vertical horizontal motors are adapted to type, which weighs about 13 Jbs. has a capacity of about 120 cu. air per minute. (2) Semi-portable, equipped long hose and nozzle, and mounted a small truck which is wheeled to parts of the house. (3) Permanent Type, installed basement and connected to a pipe running to all the rooms of the Hose and _ nozzle are used by them to the main pipe line.