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Using Euro coins as weights (2004)

(www.rubinghscience.org)
180 points Tomte | 1 comments | 20 Oct 24 10:18 UTC | HN request time: 0s | source
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rchowe ◴[20 Oct 24 12:11 UTC] No.41894824[source]▶
I built a computer vision device that used the top-down area of a penny as a calibration standard. Coins are useful, easy-to-get items that have relatively tight manufacturing tolerances.
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cassepipe ◴[20 Oct 24 12:35 UTC] No.41894944[source]▶
What about wear ? Were they only new coins ?
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Retric ◴[20 Oct 24 12:37 UTC] No.41894957[source]▶
I’ve never seen significant ware on a coin in circulation.

Have you?

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1. swores ◴[20 Oct 24 14:02 UTC] No.41895428[source]▶
I have often, though I suspect not enough to make a significant difference to someone who is already OK with the slight variance between un-worn coins.