The Numbring Nines rods, published in 1684. It's ANOTHER set of calculator sticks from the 1600s.
Download & print here: cstaecker.fairfield.edu/~cstae...
This is episode 61 of my video series about old calculating devices.
End song inspired by "Hotter than a Molotov" by The Coup.
Chris Staecker webarea: cstaecker.fairfield.edu/~cstae...
#betterbones
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