Abstract: The present invention relates to an insulation diagnosis technique for the coil of a generator or the like, especially a strike diagnosis apparatus for diagnosing the good or bad condition of insulation by comparing, directly or after a suitable processing signal, the magnitude of a strike signal applied to the generator's coil with a reference level, or by making a frequency analysis of the strike signal.

Abstract: Flying kites are disclosed including the bilaterally symmetric wind-bearing surfaces carried by a plain framework consisting of two triangular portions symmetric with respect to the central axis and pivotally interconnected along that axis. An arcuated resilient rod is fixed to those edges of the framework tilted at equal angles to the central axis. Several reinforcing rods may be disposed on the wind bearing surfaces symmetrically with respect to the central axis and across frame members forming the framework. Also an auxiliary wind including a triangular framework may be fixed to the wind bearing surfaces to be symmetric with respect to the central axis. The equations of motion of the present kite have been obtained and the strength of the framework has been discussed with the characteristics of the kite.

Abstract: The disclosure describes a method for checking an insulative condition of an insulated winding used in an electrical appliance comprising applying an external mechanical force to said insulated winding to give vibrating frequency to the same for its examination; detecting the frequency behavior to be generated in said insulated winding in the form of electrical signal outputs; and electrically processing the signals for judging deterioration occurred in said insulated winding.

Abstract: A fault diagnostic device comprises vibrating means for vibrating a winding by feeding current having a predetermined frequency; detecting means for detecting physical value given in said winding by the vibration; and indicating means for indicating the result of the detection by said detecting means whereby a diagnosis of fault can be performed in high reliability.

Abstract: In a discharge valve apparatus, a discharge port on a valve plate covered by a long thin discharge valve is formed in a elliptic shape as horizontal view whereby stress of the long thin discharge valve in longitudinal direction at its center is decreased and the fatigue strength of the valve is improved and reliability is high and the apparatus can be easily manufactured and the efficiency of the compressor is increased.