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Pohl's Wheel: A rotating pendulum (2) coupled over a spiral spring (3) with a variable stimulation (1). Damping is controlled by an electromagnetic brake (4). It is used to demonstrate chaotic motion as well as harmonic oscillations. (*)

Robert Wichard Pohl (August 10, 1884, Hamburg - June 5, 1976, Göttingen) was a German physicist.

In 1938 Robert Pohl and Rudolf Hilsch build a a solid-state amplifier.

Literary works

* Mechanik, Akustik, Wärme, 1911
* Robert Pohl: Die Physik der Röntgenstrahlen, Habil., Vieweg, Braunschweig, 1912
* Robert Pohl & Peter Pringsheim: Die lichtelektrischen Erscheinungen, Vieweg, Braunschweig, 1914
* Elektrizitätslehre, 1927
* Optik, 1940


* Robert Pohl in the German National Library catalogue

* Pohlsches Rad

* http://www.routledge-ny.com/ref/20ctech/transistors.html (Transistors)

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