Coin Ping Test Physics - interpretation of a paper by Dr David Rakestraw and the late Phil Paul
Quick interpretation of a Coin Resonances paper written by Dr David Rakestraw and the late Phil Paul.
If you get a minute look at the 0,2 and the 0,3 vibration modes (the two on the left in the pic) and imagine them happening at the same time producing 2 different sustaining frequencies.
Crazyness.
Big thanks to the Authors, Ben Faber from Faber Acoustical, and A W Leissa for his extensive work and study on vibrating plates
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If you or someone you know would like to test metals with a Pocket Pinger, they’re available at CoinPingTest.com, Amazon, and eBay.
Disclaimer: All the risks associated with pinching a coin in between your fingers and then tapping it with plastic and/or wood are present when using the device. The ping test is used for alloy identification. Always compare the sound of a potential counterfeit with the sound of a known authentic or trusted data base. Any difference in sound is a strong indication that further testing is needed. Always use multiple testing methods.
The Pocket Pinger has helped catch over 100 fake coins, all confirmed.
If you catch one with yours please reach out. There’s a valuable lesson to share in each story.
Dozens of Pocket Pinger demo videos can be found on the profile.
A simple ping test really can prevent a counterfeit situation.
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Test your stack.
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