Abstract: Distortion due to interaction or cross coupling, frequently termed "cross talk", in magnetic deflection yokes for display tubes is initially corrected by simple networks comprising capacitors and by networks comprising resistor-capacitor combinations connected in the yoke winding circuitry for canceling poles and zeros of the frequency response pattern, and residual distortion is then canceled by rearranging the turns of the winding with respect to the core of an otherwise conventional magnetic deflection yoke to provide a more uniform magnetic field and to avoid resonance in the yoke circuit. The winding is further rearranged in some applications wherein the number of total turns is not integrally divisible by distributing the conductors in an uneven winding arrangement in the same manner but having a difference of a single turn only from the adjacent courses of the winding.

Abstract: A drive system for a bubble memory consists of a drive assembly and an electrically conducting surface enclosing the drive assembly. In a preferred embodiment, the drive assembly consists of a ferrite picture frame with two pairs of drive coils and the conducting surface is the interior surface of a metallic box.