(under subclass 200) Subject matter wherein the apparatus to sense and indicate the sensing of a magnetic field is responsive to a material magnetized by a changing magnetic field going from a minimum to a maximum in one direction and than going from a minimum to a maximum in the opposite direction and produces a signal applied to a visual display or recorder which is the magnetization curve of the material.
SEE OR SEARCH CLASS
313, Electrical Lamp and Discharge Devices,
1+, for cathode-ray tube circuits of general application, and subclasses 364+ for deflection circuits for a cathode-ray tube.
346, Recorders,
33+, for recorders combined with external recorder operating means.
347, Incremental Printing of Symbolic Information,
226+, for recorders operated by a light beam including a cathode ray beam.
