F (1907 to 1911) Previous
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The Type F was essentially unchanged from the previous AC mercury-motor models except the copper disk had a number of radial slots punched in it to reduce the effect of eddy currents induced by the current coil. The internal voltage transformer was used to supply the current that was fed through the mercury chamber. This model would have been dropped as soon as the Tesla patents expired at the end of 1910, clearing the way for Sangamo to sell induction-type meters again. F
David Turner collection