(under subclass 244) Subject matter wherein the apparatus to sense and indicate the sensing of a magnetic field includes (1) an ionizable gas tube magnetic field sensor having electrodes connected to appropriate voltages wherein the tested magnetic field causes the gas to ionize at different electrode voltages dependent upon the strength of the magnetic field, (2) an energized vacuum tube magnetic field sensor having a cathode ray beam and one or more electrodes or a fluorescent screen connected to appropriate voltages to attract the beam wherein the tested magnetic field acts to deflect the beam an amount dependent upon the strength of the tested field, or (3) an electrically conductive enclosure magnetic field sensor to which a signal is applied having a ferromagnetic material in the enclosure wherein the tested field affects the material to change the signal passed through the enclosure dependent upon the strength of the field.
(1) Note. The enclosure is a waveguide, resonant cavity, or a transmission line.
SEE OR SEARCH THIS CLASS, SUBCLASS:
58+, for measuring microwave parameters or using microwave devices for determining nonelectric properties.
SEE OR SEARCH CLASS
33, Geometrical Instruments,
360, for magnetic field direction indicating apparatus using cathode-ray tubes or photo-electric cells.
250, Radiant Energy, 298, for ionic separation or analysis apparatus using magnetic means to separate or deflections, and subclass 396 for apparatus to deflect or focus a charged particle beam.
313, Electric Lamp and Discharge Devices,
153, for electric lamp and discharge devices having a magnetic device, and subclass 364 for cathode-ray tubes, particularly subclass 421 for the beam deflection means of the cathode-ray tube.
315, Electric Lamp and Discharge Devices: Systems,
399, for cathode-ray tube beam deflection circuits.
333, Wave Transmission Lines and Networks,
141+, for transmission line systems utilizing magnetic effects.
