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A magneto is an electrical generator that uses permanent magnets to produce periodic pulses of alternating current. Charles Francis Brush (March 17, 1849 - June 15, 1929) was an American inventor and philanthropist. In 1876 Brush secured the backing of the Wetting Supply Company to design his dynamo (an electrical generator) for powering arc lights. He began with the dynamo design of ZÌ©nobe Gramme but his final design was a marked divergence, retaining the ring armature idea that originated with Antonio Pacinotti. He remarked on his motivation for improving the generator in his U.S. Patent 189, 997: "The best forms of magneto-electric apparatus at present before the public are unnecessarily bulky, heavy, and expensive, and are more or less wasteful of mechanical power." After comparing it to the Gramme dynamo and other European entrants, the Franklin Institute of Philadelphia judged Brush's dynamo superior due to its simpler design and maintainability after completing tests in 1878.
