Abstract: An electrostatic precipitator for removing particulate matter from a gas comprises at least two rotatable electrically conductive disks mounted on a shaft and disposed in an electrically insulating housing. There is further provided at least one substantially rectangular duct defining a flow path through the housing and between the rotating disks. The duct is preferably removable and provides a uniform flow path for the particulate laden gas. The precipitator configuration inhibits the formation of circular flow paths which tend to deposit particulate matter in undesirable locations as a result of centrifugal forces. The precipitator also includes a pair of wiper blades which are disposed outside of the duct and which operate to remove particulate matter from the disks so that it is deposited in a chute from which it is removed, by gravity, from the precipitator housing.

Abstract: A method of fabricating a layer insulation for use in high voltage electrical equipment by applying a mixture of inorganic particles, inorganic cement, and a fluid carrier vehicle for the cement to an intermingled array of inorganic fibers.

Abstract: Layer insulation for use in high-voltage equipment such as a distribution transformer comprises substantially all inorganic material and is implemented with inorganic particles bonded together and to an intermingled array of inorganic fibers with inorganic cement to form an insulation layer reinforced by the inorganic fibers.

Abstract: In a method and apparatus for drying paper-wound bushings the paper-wound bushings are placed over a plurality of heat pipes which contain a vaporizable liquid as a heat transfer medium located within a closed container. The heat pipes are heated to raise the temperature of the paper-wound bushings to a level adequate to vaporize water left in said paper-wound bushings during manufacture thereof, thereby drying each of the bushings.