The pickups are instead mounted via two extended pole pieces that screw into bushings sunk into the pickup cavities of the guitar.
22.
The central, cylindrical pole piece surrounded by the voice coil is normally referred to as " the pole piece ".
23.
The central, cylindrical pole piece surrounded by the voice coil is normally referred to as " the pole piece ".
24.
In the case of a permanent magnet, the distinction between the magnet itself and the pole piece or pieces is more clear cut.
25.
A traditional dynamic loudspeaker has a distinctive annular magnet and pole piece structure which serves to concentrate the magnetic flux on the voice coil.
26.
Electromagnets or permanent magnets are brought into contact with fixed ferrous plates, or " pole pieces ", contained within a housing.
27.
The pole piece must be manufactured in a very symmetrical manner, as this provides the boundary conditions for the magnetic field that forms the lens.
28.
Another specialised pole piece is the armature of an electromechanical solenoid, which produces work by being attracted by an electromagnet when the magnet is actuated.
29.
Careful design of the pole pieces ensures that the magnetic field is uniform, so that the angular deflection of the pointer is proportional to the current.
30.
It was possible to place a second set of field coils and pole pieces within the same size of casing, giving a four-pole arrangement.
