1965 Silver Quarter?

, chuckster!

Too heavy for silver, the extra weight could come from plating.

Hi,




I personally feel that the least expensive, easily repeatable, and reasonably accurate method to ascertain mint-produced silver content within any well documented coin should be done using sound vibrations.

Upon tapping any coin with a hard object logic should dictate that a 90% Ag US silver dollar, for example, should have a somewhat different sound wavelength profile compared to a 90% Ag US silver dime and a dramatically different sound wavelength profile compared to any copper clad coin etc.

Apparently a free shareware program entitled Audacity,

http://wiki.audacityteam.org/wiki/A...ki_Home_Page

is available that allows anyone to easily record and graphically display the sound of any desired audible source: ie.: a tapped silver coin.

Having never attempted to use this software it sure would be nice if a ‘documented' streamline method already exists using this software that would ‘easily' allow a user to see the tested sound wavelength form of an ‘unknown' coin superimposed upon the sound wavelength form of a ‘known' silver coin.

To obtain consistency and repeatability a suspect coin's sound would have to be recorded by dropping it from the same height upon the same type of substrate also used on a known silver content coin.

Just imagine how quickly suspect coins could be verified: with or without tarnish and not having to worry about the method of ringing the coin.

The resulting comparative wavelengths could be saved on the drive of a laptop computer and selectively referenced in the future when these silver coins are presented to a skeptical potential buyer etc.

Finding research addressing my questions via an interactive tutorial or any suggestions would truly lessen the steepness of the learning curve and save valuable time...

This type of software has already been discussed at CCF but no one has yet addressed a way to superimpose the frequency graphs upon one another to more accurately differentiate each coin with a 'control' coin etc.

Thanks in advance for any ideas on this subject.

mdpmedia