A screw surface flaw inspection method and an apparatus therefor, which projects light onto the surface of a screw, the light being scanned axially of the screw, and a detector which picks up the reflected light from the projected surface and sends an output signal to a signal processing circuit to thereby detect the flaw on a basis of time base variation of the intensity of reflected light. The m...

In an electrical power distribution system, line disturbances produce voltage and current travelling waves, or step-change signals, that are phase-shifted 90 DEG relative to each other. A simulation signal is derived from the current step-change signal and is in phase with the voltage step-change signal. The two in-phase signals are combined and compared with established limit values to determine...

The amount of air entering an engine is determined by selecting the more accurate of two airflow determination means. One means measures a parameter characterizing airflow into the engine. Another means calculates airflow into the engine as a function of engine speed and air density.

In a heating device for use in a vulcanizing apparatus in which a green tire is vulcanized by using a metal mold, three magnetic cores around each of which an electromagnetic coil is wound are arranged equidistantly on at least one surface of the metal mold, and a magnetic yoke is arranged on these magnetic cores. Then, three phase alternating currents are respectively supplied to the electromagne...