| 摘要 |
This stray magnetic field neutralising device for image tube, includes a coil 3 termed the counter-field coil, placed in front of the front face of the image tube, means 4 for sensing the magnetic field forward of the front face of the image tube and servocontrol means 5, 6 for adjusting the current injected into the counter-field coil to a value making it possible permanently to have a minimal resultant sensed field. <IMAGE>
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