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John Westmoreland Record
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Dental Tools And Instruments Or Auxiliary Dental Instruments
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Abstract
26,242. Record, J. W. Nov. 15. Magnets.-A magnet for an electric meter has a ring-shaped pole-piece N, Fig. 2, threading a moving-coil B, and a pole-piece S larger than the arc swept out by the coil, to avoid irregularity in the magnetic flux. The polepiece S may be of circular or other form, and it may be formed with a gap, as indicated by the lines D, D<1> in Fig. 4, corresponding with the neck of the pole-ring. In the modification shown in Fig. 6, the pole-faces are curved.
GB191226242D1912-11-151912-11-15Improvements in and connected with Moving Coil Electrical Measuring and like Instruments.
ExpiredGB191226242A
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