| 11. | The rotor must bridge the path between opposing pole pieces, but must never bridge all four simultaneously.
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| 12. | On top of the poles pieces of wood are fitted that serve as the base for the roofbeams.
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| 13. | This causes the pole-piece to wear, eventually requiring the pole pieces to be reground and recertified.
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| 14. | The second reason is that the pole pieces can make tuning and placement of the strings much more difficult.
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| 15. | A pole piece attaches to and in a sense extends a pole of the magnet, hence the name.
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| 16. | As these plants were necessarily large, they could also use large-diameter dynamos with many pole pieces.
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| 17. | The pole pieces and leads of the coils were reversed with respect to each other, producing a humbucking effect.
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| 18. | The bar-shaped magnet affects strings uniformly, without irregularities known in more traditional design with separate pole pieces.
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| 19. | The field coils now moved into short, squat " internal " coils around the pole pieces themselves.
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| 20. | The Les Paul Deluxe mini-humbucker has adjustment screws for the pole pieces; the Firebird mini-humbucker does not.
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