Uploaded April 2023 | Updated September 2026, 2 weeks ago

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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