The Abaque, OR Universal Calculator (Compteur Universel), a very ambitious nomogram created by Léon Lalanne in 1843. It can multiply and do some other stuff.
This is episode 75 of my video series about old calculating devices.
My page about the Abaque: https://faculty.fairfield.edu/cstaecker/machines/lalanne.html
End song inspired by "Hotter than a Molotov" by The Coup.
Smartphone lady photo by User Fairphone on Flickr, CC-BY-SA-2.0
Chris Staecker webarea: https://faculty.fairfield.edu/cstaecker
#nomogram