• 

  W Ursae Majoris - YouTube

  https://www.youtube.com/watch?v=jV6trZBpl18

  Here is W Ursae Majoris, the third and final eclipsing binary prototype.

• 

  Bessler's Perpetual Wheel. Das Bessler Rad - YouTube

  https://www.youtube.com/watch?v=rnKjv9hnepE

  Johann Ernst Elias Bessler, or Orffyreus as he preferred to be called, created a series of wheels he claimed were driven by the position, arrangement and mot...

---

---