Abstract: Apparatus for direct current to alternating current power conversion by means of progressive variation of magnetic flux in associated magnetic paths. A direct current input is subdivided into power pulses in two permeance controlled transformers. The pulses are modified, stabilized and recombined in phase opposition to produce a single alternating current output.

Abstract: A direct current power apparatus for control of current amplitude during overload, short circuit, switching and similar events. During normal operating conditions, current flows substantially unaffected through the windings on a pair of commutated reactors. However, when current exceeds a predetermined value, reactor flux is varied to increase the counter electromotive force within the reactors to thereby limit the output current to a safe level.

Abstract: Apparatus for control of direct current by means of systematic switching and progressive variation of magnetic flux in associated magnetic paths. Subdivision of the input DC power between two transformer devices permits transformation by controlled electromagnetic induction into stabilized outputs which may be recombined into continuous DC power at controlled voltage or current levels.

Abstract: Apparatus for conversion of alternating current at a first frequency to alternating current at a second (lower) frequency in a power control circuit by means of progressive variation of magnetic flux in associated magnetic paths. Control is achieved by progressive saturation or domain rotation for selected portions of the magnetic paths to yield a uniformly controllable permeance within the magnetic paths. Feedback circuits provide a means for external control of the output in combination with a reference source.

Abstract: An alternating to direct current power converter utilizing dynamically controlled electromagnetic induction. A feedback system controls permeance within a network of magnetic paths by progressive saturation or domain rotation within selected portions of the paths to provide unidirectional direct current power from an ac input.

Abstract: An alternating current power control circuit utilizing progressive variation of magnetic flux in associated magnetic paths. Voltage and current sensors at an output provide feedback signals to permeance control devices to apportion flux between a pair of magnetic paths such that the primary magnetizing current remains essentially unchanged during the control process.

Abstract: In this pioneering invention, electrical energy in alternating or direct current form at any selected power, voltage, current, or frequency, within wide limits, is converted and controlled to other forms of electrical energy at uniformly and continuously controlled output waveform and voltage or current by means of progressive variation of magnetic flux in associated magnetic paths. For electrical energy regeneration, this invention relies on electromagnetic induction in windings surrounding variable permeance magnetic paths of ferrimagnetic or ferromagnetic materials. The controlling means rely upon progressive saturation and/or domain rotation for selected portions of the magnetic paths to yield a uniformly controllable permeance within the magnetic paths. Feedback techniques are used to stabilize the output and provide the means for external control of power output in combination with a reference source.

Abstract: The specific information storage and retrieval system described herein stores 49,000 microfiches in a central file, any one of which may be viewed in a matter of seconds. More specifically, the central file uses an arrangement of 20 shelves mounted on a closed loop track, each holding 2,450 microfiches, each microfiche in turn having 50 or 60 separate images. When a particular microfiche is selected, the proper shelf is rotated into a predetermined position. Concurrently a viewing station including a transducer such as a film camera or a television camera is brought adjacent to the selected microfiche which is partially extracted from its storage location so as to be viewed by the transducer.