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Sangamo Type H electric meter, 1911

Sangamo Type H electric meter, 1911

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This model had been in development for some time before its introduction in 1911, but Sangamo had to wait for the Tesla patents, owned by Westinghouse, to expire.

This induction-type meter uses fluctuations in magnetic fields to turn the rotating disk, while a drag, or lag, magnet keeps the disk turning at a rate proportional to the current.

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