(under subclass 200) Subject matter which involves the testing of permanent magnets which have their own static magnetic field, the apparatus to sense and indicate the sensing of the field including a field sensing member placed in the field and an indicator responsive to the member.
(1) Note. The sensing member may be a fixed or movable permanent magnet, a member that can be temporarily magnetized by the field of the tested magnet, an electrically conductive member that causes eddy currents in response to the field, or a sensing coil that is fixed or movable.
SEE OR SEARCH THIS CLASS, SUBCLASS:
228, for the testing of material by a magnetic field and the sensing of the material modified field by a nonelectrically energized field sensor.
256, for the sensing of a magnetic field by a movable energized sensing coil magnetometer.
259, for a magnet or magnet member sensor type magnetometer.
SEE OR SEARCH CLASS 335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,
