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John Dixon Gibbs (1834–1912) was a British engineer and financier who, together with Lucien Gaulard, is often credited as the co-inventor of the AC step-down transformer. The transformer was first demonstrated in 1883 at London's Royal Aquarium. At the time the term "transformer" had not yet been invented, so instead it was referred to as a "secondary generator". Although he is usually credited equally with Gaulard, Gibbs's role in the invention appears to have been more that of a financial backer and businessman.
Although the underlying physics of the transformer, mainly Faraday's law of induction, had been known since the 1830s, transformers became viable only after the introduction of Gaulard and Gibbs's transformer design in 1883. The breakthrough was to build an iron transformer core. At the time, their invention was seen as over-complicated since it contained a movable armature. It caught the attention of Sir Coutts Lindsay, who used it to power the Grosvenor Gallery, which was one of the first lighting systems in Britain powered by a central generating station. In 1885 Ottó Bláthy, Miksa Déri and Károly Zipernowsky secured a patent on a similar design, using laminated sheets of metal to reduce eddy currents.
Information on an exhibition of Gibbs and Gaulard's transformer in Turin, Italy in 1884 was published in 1885 and caught the attention of George Westinghouse. In the summer of 1885 Westinghouse bought the American rights for Gibbs and Gaulard's design and ordered that several transformers from Gibbs and Gaulard. Westinghouse then asked the engineer William Stanley, Jr. to design an electric lighting system using them. Stanley subsequently greatly improved on Gibbs and Gaulard's design and is often credited in their place.
John Dixon Gibbs had his work patented under German patent no. 28947, a patent also recognized in Great Britain. The patent was disputed by Sebastian Ziani de Ferranti. Gibbs and Gaulard lost the patent, and Gibbs was financially ruined in the process.
The above information is condensed from the Wikipedia entry.
See also Gaulard-Gibbs.