Engraving depicting early transformers

Engraving depicting early transformers: Left, Faraday's 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 Ritchie's (1842) forerunner of the Ruhmkorff coil: this had a core of iron rods forming an open magnetic circuit

1831 1842 Circuit Coil Coils Core Faraday Faradays Forerunner Forming Magnetic Masson Notebooks Ritchie Rods Separate Transformer Transformers Wound

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