Riess spirals, or Knochenhauer spirals, are a pair of spirally wound conductors with metal balls at their ends. Placing one above the other forms an induction coil. Heinrich Hertz used them in his discovery of radio waves.[1] They are named for German physicists Peter Theophil Riess and K. W. Knochenhauer.
https://en.wikipedia.org/wiki/Riess_spiral
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