John Ernst Worrell Keely

John Ernst Worrell Keely was an American fraudster and self-proclaimed inventor from Philadelphia who claimed to have discovered a new motive power which was initially described as "vaporic" or "etheric" force, and later as an unnamed force based on "vibratory sympathy", by which he produced "interatomic ether" from water and air. Keely's claims were highly disputed throughout his career and, in the 21st century, are generally considered to be pseudoscientific.