1. These phonographs featured a large counterbalanced tone arm with horseshoe magnet pick-up. 2. It consisted of a revolving horseshoe magnet passing over two wound wire coils. 3. The surviving machine has an applied field from four horseshoe magnets with axial fields. 4. The guitar's pickup includes individual string magnets as well as a large horseshoe magnet . 5. The other block of wood supported a horseshoe magnet made of two toy magnets. 6. He used horseshoe magnets in a single-coil and later a hum cancelling dual coil configuration. 7. The two halves of the base plus the rotating magnet form a sort of horseshoe magnet . 8. The instrument was made of cast pickup that incorporated a pair of horseshoe magnets that arched over the strings. 9. It consisted of two bobbins of iron wire, opposite which the poles of a horseshoe magnet were caused to rotate. 10. This box telephone consisted a large " U " shaped, horseshoe magnet with an iron core attached to each pole.
