their dining room table with iron shears trying to harvest cupronickel dust from pocket change. So why did the ridges stick around?
1. Tactile Accessibility for the Visually Impaired
Modern coin ridges provide instant tactile feedback. For visually impaired and blind individuals, distinguishing coins by diameter alone can be frustratingly imprecise, especially between coins of similar scale. A dime measures 17.91 millimeters across, while a penny measures 19.05 millimeters—a difference you might easily miss when reaching into your pocket.
The ridges solve this instantly. A dime has a
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