What were “metallic tractors”, advertised in London in 1798?

Answer: A bogus medical treatment which was claimed cured all illnesses. Developed by American “physician” Dr. Elisha Perkins, tractors were 2-3 inch long rods which were tapped on the afflicted area. Perkins convinced a number of people on the veracity of his treatment, including US President George Washington (1732-1799).

Source: John Haygarth by Christopher Booth

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