Slideshow with drawings of Cornelis Drebbel's Perpetuum Mobile. More images here.
1612 in a letter from Antonini to Galilei
1604 in a letter from John Speed.
From Joachim Morsius' Album
1614 from Jakob Fetzers Album
1612 according to Heinrich Hiesserle von Chodaw.
2007-2012, Working model made by Richard SantaColoma.
1992 Model by Andrew Crisford
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