(under subclass 244) Subject matter wherein the apparatus to sense a magnetic field is a movable electrically energized magnetic field sensing coil, the magnetic field created by the coil interacts with the magnetic field tested to produce a force which moves the sensing coil, and the apparatus to indicate the sensing of the field is connected to the coil to note the movement of the coil.
(1) Note. The magnetic field created in the sensing coil may be a steady state or a changing magnetic field.
(2) Note. The sensing coil may turn or be vibrated by the force caused by the interaction of the tested magnetic field with the field of the sensor.
SEE OR SEARCH THIS CLASS, SUBCLASS:
236, for magnetic field sensors of the coil type which sense the change in a magnetic field caused by a tested material.
260, for magnetic field sensors of the induction type not classified elsewhere.
