Abstract: Disclosure is made of an inductor for working metals by the pressure of a pulsating magnetic field, wherein on the outer surface of a concentrator, which has a working opening to receive an article to be worked and a radial slot, there are provided annular grooves, the spacings between the annular grooves forming stiffening ribs of the concentrator; laid in said annular grooves are flat helical sections of a winding, the beginning of each section enveloping an electrically conducting rod arranged in a bore extending through the concentrator, being parallel with the axis of the working opening and being next to said annular grooves; the ends of each flat helical section are interconnected in parallel by means of a bus; in said concentrator ribs, there are provided threaded holes to receive screws whose butt ends press upon the electrically conducting rod.

Abstract: A device for inducing an electrical voltage comprises primary and secondary windings wound round a core. The core has a first part responsive to high frequencies and a second part responsive to low frequencies. The axial length of the first part does not exceed the axial length of the second part, but exceeds the axial length of primary and secondary windings.

Abstract: The process provides practical manufacture of a two-piece, dielectric filled, ferrite toroid assembly while providing optimum electromagnetic characteristics presently not consistently available by manufacturing the toroid in a pressed one-piece configuration. A pair of complementary ferrite blanks of selected shapes are machined to dimension, and the mating surfaces thereof are selectively lapped. The complementary ferrite parts are then permanently assembled about a pre-machined dielectric insert, and the composite toroid is secured together by a selected adhesive selectively disposed therein.

Abstract: A radio receiver and a battery are housed in a button adapted to fit in the ear cavity. The button is attached to the ear by a hook. The radio receiver has an antenna tuned to intercept a single frequency radio signal, means for producing an audio signal from the radio signal intercepted by the antenna, and means for converting the audio signal to sound waves. The antenna comprises a coil wrapped around an insulated core made of compressed barium ferrite particles of controlled size and a capacitor in parallel with the coil. Due to the high effective permeability of the barium ferrite core, a sufficiently narrow band width and signal strength for satisfactory radio reception in the A.M. broadcast band can be obtained with very small core dimensions.

Abstract: A total underground residential electrical distribution system having a high voltage supply and low voltage distribution to residents connected to the system is characterized in that at least one of the transformers used in the system for stepping down the high voltage supply to the low voltages for distribution is constructed as a cable having a magnetic core, and has a high voltage primary winding extending substantially over the full length of the cable, and a number of low voltage secondary windings which together extend over substantially the full length of the cable.

Abstract: A magnetic circuit which exhibits low reluctance on the path of a magnetic flux and comprises at least one anisotropic thin film formed of an iron-nickel-chromium alloy through which said magnetic flux passes in the hard direction of magnetization of the film.

Abstract: There is disclosed a magnetic core and the method of making the same. The core is formed of a plurality of microlaminations. Since each discrete microlamination is of elongated rectangular shape, soft, ductile and magnetically insulated, the cores exhibit improved permeability, lower core loss, lower exciting volt amps and exhibit improved high frequency characteristics.