Electrical installations of electric light, power, traction and industrial electrical machinery (1902)
Kennedy, Rankin, d. 1917 · Edinburgh T.C. & E.C. Jack · leaf 251
factory manner in the Thomson recording watt-meter by placing on the shaft a thin disc of copper, this disc r(~)tatingin a constant magnetic field between the poles of permanentmagnets. These latter induce foucault or eddy currents in the disc,thus creating a drag on the motor. The ohmic resistance… … Fig. 250 Connections of Thomson Recording Walt-Meter for Two-Wire Circuits. 3 to 50 Amperes, 50 to 500 Volts Motor Generator Meters, Ironless speed ; and the retardation, which is proportional to the currentX held, will also vary directly as the speed. Thus a resistance hasbeen provided which bears…
Electrical engineering · Electric power
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