Chris Staecker | The Sector: the calculator of the 1500s @ChrisStaecker | Uploaded October 2024 | Updated October 2024, 2 hours ago.
An antique ivory sector, from the late 1800s. Also called the proportional compass, or the military compass. Invented very slowly over about 2000 years, ending up in 1500s Europe.

This is episode 83 of my video series about old calculating methods.

Printable sector: thingiverse.com/thing:6706843

Printable dividers: thingiverse.com/thing:6793282

Iranian Astrolabe photo by Wikimedia user Masoud Safarniya CC-BY-SA-3.0
en.wikipedia.org/wiki/File:Iranian_Astrolabe_14.jpg

Galileo sector photo by Wikimedia user Ragesoss CC-BY-SA-3.0
en.wikipedia.org/wiki/File:Galileo%27s_geometrical_and_military_compass_in_Putnam_Gallery,_2009-11-24.jpg

End song inspired by "Hotter than a Molotov" by The Coup. youtu.be/X8AW7PmsxAY

Chris Staecker webarea: https://faculty.fairfield.edu/cstaecker

#clampin