| This model was the final version of the Thomson Induction Wattmeter, and it shares many similarities
in design with the Form C-4 meter including the fixed brake magnets, reactance coil, and the starting coil. There was a
second adjustment introduced on this meter - an anti-creep device which was a wire bonded to the disk near the
hub that was bent towards or away from the shaft. |
 Electrical Meterman's Handbook |