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Engraving depicting early transformers: Left; Faradays first (1831) model; based on a drawing in his notebooks: this was an iron ring wound with two separate coils of wire. Right Masson and Ritchies (1842) forerunner to the Ruhmkorff coil: this had a core of iron rods forming an open magnetic circuit. Dated 19th century.

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達志影像

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