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Direct-reading ammeter, 1900.

Direct-reading ammeter, 1900.
3 2 c m
actual image size: 32cm x 24cm


Edward Weston introduced this type of meter in 1889. It was the first pivoted moving coil meter, and the first thoroughly reliable direct-reading meter. Made by Weston Electrical Instrument Co, New Jersey, United States.

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© Science Museum / Science & Society Picture Library

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