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<p>[QUOTE="GDJMSP, post: 2887096, member: 112"]Some of the points being made about the possibility of error and the results of error are valid. For example, a 1% error in the weight of the coin can result in up to a 10% error of the specific gravity. Given this - </p><p><br /></p><p><br /></p><p><br /></p><p>All by itself that could account for roughly half of the discrepancy when it comes the reported specific gravity.</p><p><br /></p><p>Then you also have the legal tolerances to consider. For example, the gross weight of the coin, in this case a 90% silver half dollar, is specified to be 192.90 grains. But the tolerance is 1.5 grains which means the coin may weigh only 191.40 grains and be perfectly legal. And the fineness of the silver is specified at .900 but the tolerance is 0.006, which means the actual fineness may only be .894 and be perfectly legal. </p><p><br /></p><p>Throw either one or both of those into the calculations, along with the estimated error in weight 0.5%, and I think it would be pretty easy to come up with the specific gravity numbers being reported.[/QUOTE]</p><p><br /></p>
[QUOTE="GDJMSP, post: 2887096, member: 112"]Some of the points being made about the possibility of error and the results of error are valid. For example, a 1% error in the weight of the coin can result in up to a 10% error of the specific gravity. Given this - All by itself that could account for roughly half of the discrepancy when it comes the reported specific gravity. Then you also have the legal tolerances to consider. For example, the gross weight of the coin, in this case a 90% silver half dollar, is specified to be 192.90 grains. But the tolerance is 1.5 grains which means the coin may weigh only 191.40 grains and be perfectly legal. And the fineness of the silver is specified at .900 but the tolerance is 0.006, which means the actual fineness may only be .894 and be perfectly legal. Throw either one or both of those into the calculations, along with the estimated error in weight 0.5%, and I think it would be pretty easy to come up with the specific gravity numbers being reported.[/QUOTE]
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