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Edward M Clarke (1804-1846) was born in Ireland and trained in instrument making in Dublin. In 1833 he moved to London to work for instrument makers Watkins and Hill. He studied magneto-electric machines made by Hippolyte Pixii and by Joseph Saxton, and developed one of his own design. He soon resigned his job, and by 1835 he was making and marketing his own improved electrical machine, with two armatures. A heated debate arose between Saxton and Clarke over piracy of ideas. See here for more information.