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Why copper/nickel clad?
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<p>[QUOTE="Conder101, post: 427992, member: 66"]This is the line they give us today, and today it is pretty much true, but that wasn't the case in 1964/65. Back then the electrical and magnetic properties weren't that important because the coin detection mechanisms in the vending machines were strictly mechanical and didn't measure electrical or magnetic properties (Other than a magnet to make sure it wasn't a steel slug) They only checked weight, diameter, thickness, and for a hole in the center to make sure it wasn't a washer.</p><p><br /></p><p>Besides Coppernickel clad and 90% silver do not have the same weight , density, electrical or mechanical properties, and they were not very compatible in the vending machines mainly because of the difference in weight. A machine adjusted for silver tended to reject the clad coins, and one set for the clad would reject the silver ones. And if the tolerances were set so broad so as to accept both, they tended to accept anything. (Todays vending machines will also usually reject silver coins because they don't have the electromagnetic signature of the clad coins that todays machines check for.)</p><p><br /></p><p><br /></p><p>This was probably the major reason for the choice, the material was and still is, very difficult to produce and therefore counterfeits would also be very difficult to make.[/QUOTE]</p><p><br /></p>
[QUOTE="Conder101, post: 427992, member: 66"]This is the line they give us today, and today it is pretty much true, but that wasn't the case in 1964/65. Back then the electrical and magnetic properties weren't that important because the coin detection mechanisms in the vending machines were strictly mechanical and didn't measure electrical or magnetic properties (Other than a magnet to make sure it wasn't a steel slug) They only checked weight, diameter, thickness, and for a hole in the center to make sure it wasn't a washer. Besides Coppernickel clad and 90% silver do not have the same weight , density, electrical or mechanical properties, and they were not very compatible in the vending machines mainly because of the difference in weight. A machine adjusted for silver tended to reject the clad coins, and one set for the clad would reject the silver ones. And if the tolerances were set so broad so as to accept both, they tended to accept anything. (Todays vending machines will also usually reject silver coins because they don't have the electromagnetic signature of the clad coins that todays machines check for.) This was probably the major reason for the choice, the material was and still is, very difficult to produce and therefore counterfeits would also be very difficult to make.[/QUOTE]
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Why copper/nickel clad?
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