In 1885, William Stanley, Jr. built the first practical transformer based on Gaulard and Gibbs' idea, the precursor of the modern transformer.
Jr. built the first practical transformer based on Gaulard. Jr. built the first practical transformer based on Gibbs'idea. This was in 1885. William Stanley was 1885. Gaulard were the precursor of the modern transformer. Gibbs' idea were the precursor of the modern transformer.