Abstract: Heat generated in an atmospheric coal combustion process is recovered by air compressed in a hydraulic compressor and passed through air heaters in an associated coal combustor and through a heat exchanger means in thermal contact with the exhaust flow of a gas turbine to thereby provide a heated compressed motive fluid for the production of useful work in the turbine.

Abstract: A humidity sensitive device is formed of a humidity sensitive material comprised of a magnesium aluminate spinel and titania material. The humidity sensitive device includes various means for applying heat to the humidity sensitive material to purge the humidity sensitive material of foreign substances and also thereby to restore or rejuvenate the characteristics of the humidity sensitive material.

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.

Abstract: A commutation circuit for a high voltage DC circuit breaker incorporates a resistor capacitor combination and a charging circuit connected to the main breaker, such that a commutating capacitor is discharged in opposition to the load current to force the current in an arc after breaker opening to zero to facilitate arc interruption. In a particular embodiment, a normally open commutating circuit is connected across the contacts of a main DC circuit breaker to absorb the inductive system energy trapped by breaker opening and to limit recovery voltages to a level tolerable by the commutating circuit components.

Abstract: In a dynamoelectric machine having armature conductors located in the air-gap separating rotor and stator, the conductors are secured to the stator structure. Conductor fastening means are provided which maintain the armature conductors and their support members in compression in all modes of operation of the machine.