The Gerbert abacus, designed by Gerbert d'Aurillac in the late 900s AD. It's a counting board with counters marked with arabic numerals.
This is episode 43 of my series about antique calculating devices.
Chris Staecker webarea: http://cstaecker.fairfield.edu/~cstaecker
End song inspired by "Hotter Than a Molotov" by The Coup.
#math #abacus #gerbert
