My reviews & how-tos for adding machines and other antique calculating devices.
Curated by: Chris Staecker (120 videos)
The ACU-ARC Ruler, invented in the 1950s. I'm not sure how old mine is. An instrument for drawing and measuring arcs of circles with specific radius of curvature. Invented by James E Hoyle, manufactured by Hoyle Engineering Company. This is episode 72 of my video series about old calculating devices. End song inspired by "Hotter than a Molotov" by The Coup. Chris Staecker webarea: https://faculty.fairfield.edu/cstaecker #mustvebeenacrimering French curves photo by Wikimedia user Radomil, CC-BY-SA 3.0 Pole vaulter photo by Wikimedia Commons user Isiwal, CC BY-SA 4.0