Daniel Hering in 1924.
History relates several types of perpetual motion machines.
The inventor's motives range from the ideal of pure invention to an attempt to defraud the public. Perpetual motion machines have been traced back for several hundred years. As of this date there has been no known account of a working perpetual motion machine which can be built and demonstrated by anyone other than the inventor. Although, we have heard many claims, we have yet to see a working model. This does not rule out the possibility that one could actually be made and practically demonstrated.