Drawing from the Carl Johan Cronstedt's sketchbook, 1729. A sideview of the Polhem's astronomical clockwork can be seen on the right side. On the left side is a drawing of the bottom wheel with the star time worm gear.


  • Title: Astronomical clockwork, drawing
  • Type: Drawing
  • Rights: CC BY-NC-SA 4.0
  • External Link: National Museum of Science and Technology

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