John Ernst Worrell Keely demonstrates his “induction resonance motion motor”, a perpetual motion machine, which eventually turns out to be a fraud.

John Ernst Worrell Keely demonstrates his “induction resonance motion motor”, a perpetual motion machine, which eventually turns out to be a fraud.
It Happened on
November 10, 1874

John Ernst Worrell Keely claimed the invention of an induction resonance motion motor. He explained that he used “etheric technology”. In 1872, Keely announced that he had discovered a principle for power production based on the vibrations of tuning forks. Scientists investigated his machine which appeared to run on water, though Keely endeavoured to avoid this. Shortly after 1872, venture capitalists accused Keely of fraud (they lost nearly five million dollars). Keely’s machine, it was discovered after his death, was based on hidden air pressure tubes. (Wikipedia, History of perpetual motion machines)

Keely’s shenanigans comes up in the following article.

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John Ernst Worrell Keely

fraudulent American inventor from Philadelphia who claimed to have discovered a new motive power which was originally described as "vaporic" or "etheric" force

Be patient. Your future will come to you and lie down at your feet like a dog who knows and loves you no matter what you are.
- Kurt Vonnegut