(under subclass 151) Subject matter in which the permanent magnet is associated with an eddy current means and the permanent magnet acts as a drag for the eddy current means.
(1) Note. The eddy current means usually is a disk rotor.
SEE OR SEARCH THIS CLASS, SUBCLASS:
103, for excess type meters which utilize a hysteresis type brake (which has a constant counter-torque at all speeds) having a permanent magnet and for meters in which the torque on the drag magnet actuates an indicator by movement of the drag magnet
137+, for similar subject matter where an eddy current disk acts both as a motive element and a drag element.
139, for meters having a rotor which is driven by a constant torque device and having a brake whose drag is determined by the electricity to be measured. SEE OR SEARCH CLASS
310, Electrical Generator or Motor Structure,
103+, for magnetic field type torque transmitting brakes and clutches.
