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 to the Ruhmkorff coil: this had a core of iron rods forming an 'open magnetic circuit'. Dated 19th century

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 to the Ruhmkorff coil: this had a core of iron rods forming an 'open magnetic circuit'. Dated 19th century
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Image Number: 1746-29957940Rights ManagedCredit Line:World History Archive/Image Asset Management/SuperStockCollection:Image Asset ManagementContributor:World History ArchiveModel Release:NoProperty Release:NoResolution:6264×3348
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