How to spin a coin for two minutes


#1

Originally published at: https://boingboing.net/2018/10/05/how-to-spin-a-coin-for-two-min.html


#2

When I worked at the Nature Company back in the 90s we sold these. I had no idea why they were interesting until this video.


#3


#4

I was hoping for a vacuum bell.


#5

That’s no coin…


#6

Ah, Euler’s Disk. The story of how it was discovered and perfected is a fun read, and all engineering curiosity (rather than purely mathematical). http://eulersdisk.com/history.html

If I remember correctly, my mirror isn’t perfectly flat, but slightly concave to enhance the spolling effect.


#7

This topic was automatically closed after 5 days. New replies are no longer allowed.