My reviews & how-tos for adding machines and other antique calculating devices.
Curated by: Chris Staecker (120 videos)
The D & H Color Rule, made by the Davidson & Hemmendinger Company in 1967. A slide-rule type gadget for measuring color metamerism. This is episode 70 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 #metamerism