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Theory of the Meter
The Lower Bearing
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approximately arctan ball ball-bearing braking magnets calculated centimetres centre coefficient of friction component constant current electromagnet current flux curves damping torque diagram direct current direction double-frequency driving torque dyne-cm eddy currents eddy-current effect electromagnetic system Equation exist experiments figure of merit frictional torque full load G. F. Shotter give given in Table grammes impacts indicate induced interaction jewel and pivot jewel radius Lissajous figure lower bearing lubricated maximum pressure mils modern meters monopolar-1 movement moving coil no-load nomogram number of revolutions optic axis parasitic force parasitic vibration permanent magnets pivot and jewel pivot radius polarity poles polished produced pull-over force pure rotation radii ratio register torque results obtained rotor rubber suspension sapphire shown in Fig Single-phase Meters spindle spring static steel Swarf synchronous speed t/sq tests theory tons/sq top bearing type of bearing upper jewel values various voltage electromagnet voltage flux watt-hour meter wear ring