My reviews & how-tos for adding machines and other antique calculating devices.
Curated by: Chris Staecker (120 videos)
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: https://www.thingiverse.com/thing:6706843 Printable dividers: https://www.thingiverse.com/thing:6793282 Iranian Astrolabe photo by Wikimedia user Masoud Safarniya CC-BY-SA-3.0 https://en.wikipedia.org/wiki/File:Iranian_Astrolabe_14.jpg Galileo sector photo by Wikimedia user Ragesoss CC-BY-SA-3.0 https://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. https://youtu.be/X8AW7PmsxAY Chris Staecker webarea: https://faculty.fairfield.edu/cstaecker #clampin