Abstract: A submarine, optical-fiber cable having a central metal wire, a slotted rod surrounding the wires, an absorbent sheath surrounding the slotted rod, a plurality of strength members helically wound around the absorbent sheath, a metal jacket surrounding the strength members, and a plastic sheath surrounding the metal jacket. The slotted rod includes peripheral helical slots, and each of the slots may receive at least one optical fiber or at least one optical ribbon. The optical ribbon includes at least two optical fibers. Each of the optical fibers has a tensile strain ranging from about 0.015 to 0.3% along its axis. The absorbent sheath includes a layer surrounding and contacting the slotted rod for absorbing water. The cable is suitable for operating in deep sea beds for a long period of time, for laying and recovering cables, and for quick repair. Modulated strain distribution in the optical fibers suppresses stimulated Brillouin scattering therein.

Abstract: The present invention relates to a vacuum cleaner having a suction motor 13, which is encased in a casing, and a brush motor 12 for driving a brush, which is encased in a floor nozzle. A remote control of the rotational speed of the suction motor 13 is performed by superimposing a signal on two feed wires 32, 33 provided from the casing to the brush motor 14.

Abstract: An electronic air cleaner is disclosed in which the corona discharge wire and the counterelectrode are positioned outside the flowpath of dust-laden air. Diverging electric force lines are discharged from the discharge wire electrode, which is nearer the flow path than the counterelectrode, when a high voltage is applied and ions are directed into the passing airflow path in a reacting area or zone. Dust contained in the air flow path is electrically charged by the ions and collected on a filter, which may also be electrically charged, positioned downstream from the reacting zone. In the device the discharge wire is not directly exposed to the dust-laden air, the electrically charged particles being collected on a separate, easily cleaned filter. The design of the electronic air cleaner requires less maintenance, easier cleaning and a longer period of operational quality.