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<p>[QUOTE="desertgem, post: 3650950, member: 15199"]The largest physical variation between the 2 , besides hardness measurement, is conductivity of soundwaves. This is a hack-up , but it works as well as many that are in a snazzier looking machine at the bullion dealer.</p><p><br /></p><p><a href="https://www.amazon.com/Ultrasonic-Thickness-Digital-1-2-220mm-Storage/dp/B07QGZ94D3/ref=zg_bs_401603011_17?_encoding=UTF8&psc=1&refRID=2WZ2SZY6ZN7C21WF1TXT" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.amazon.com/Ultrasonic-Thickness-Digital-1-2-220mm-Storage/dp/B07QGZ94D3/ref=zg_bs_401603011_17?_encoding=UTF8&psc=1&refRID=2WZ2SZY6ZN7C21WF1TXT" rel="nofollow">https://www.amazon.com/Ultrasonic-Thickness-Digital-1-2-220mm-Storage/dp/B07QGZ94D3/ref=zg_bs_401603011_17?_encoding=UTF8&psc=1&refRID=2WZ2SZY6ZN7C21WF1TXT</a></p><p><br /></p><p>It is basically measuring how fast the sound wave travels through different metals. In Gold sound travels @3200m/sec, In Tungsten @ 5200m/sec</p><p>speed for other here <a href="http://www.classltd.com/sound_velocity_table.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.classltd.com/sound_velocity_table.html" rel="nofollow">http://www.classltd.com/sound_velocity_table.html</a></p><p><br /></p><p>The basics : The unit usually measure depth by entering the metal speed and it then uses ultrasound ( you have to put a drop of fluid ( drop of oil) to make good sound contact) to tell you the depth ( thickness of the metal). The table above has the velocities. </p><p><br /></p><p>But we can also do the opposite. We can enter the thickness of the coin or bar and it can indicate the speed, ( metal composition) which we can then look up on the chart also. There are other charts where experimenters have determined speed for different karat of gold, etc.</p><p><br /></p><p>There are many articles about using this process you can google, but the story is that this was the method the Gov. used to verify the gold in depository wasn't fake tungsten.</p><p><br /></p><p>For what is worth. I bought one and it takes practice, but can find a fake silver in with real . The accuracy is maybe several % on the speed and you have to measure the depth carefully with a plastic/nylon caliper to avoid scratching.</p><p><br /></p><p>Cheap entertainment for bullion people. Old people have hard time differenciating sounds through the air. Me included Jim[/QUOTE]</p><p><br /></p>
[QUOTE="desertgem, post: 3650950, member: 15199"]The largest physical variation between the 2 , besides hardness measurement, is conductivity of soundwaves. This is a hack-up , but it works as well as many that are in a snazzier looking machine at the bullion dealer. [URL]https://www.amazon.com/Ultrasonic-Thickness-Digital-1-2-220mm-Storage/dp/B07QGZ94D3/ref=zg_bs_401603011_17?_encoding=UTF8&psc=1&refRID=2WZ2SZY6ZN7C21WF1TXT[/URL] It is basically measuring how fast the sound wave travels through different metals. In Gold sound travels @3200m/sec, In Tungsten @ 5200m/sec speed for other here [URL]http://www.classltd.com/sound_velocity_table.html[/URL] The basics : The unit usually measure depth by entering the metal speed and it then uses ultrasound ( you have to put a drop of fluid ( drop of oil) to make good sound contact) to tell you the depth ( thickness of the metal). The table above has the velocities. But we can also do the opposite. We can enter the thickness of the coin or bar and it can indicate the speed, ( metal composition) which we can then look up on the chart also. There are other charts where experimenters have determined speed for different karat of gold, etc. There are many articles about using this process you can google, but the story is that this was the method the Gov. used to verify the gold in depository wasn't fake tungsten. For what is worth. I bought one and it takes practice, but can find a fake silver in with real . The accuracy is maybe several % on the speed and you have to measure the depth carefully with a plastic/nylon caliper to avoid scratching. Cheap entertainment for bullion people. Old people have hard time differenciating sounds through the air. Me included Jim[/QUOTE]
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