US Pennies compositions & TID's on CTX3030

[pulltabfelix]

Ever wondered why pennies ring up so differently? Well you probably knew, but here are some more detailed results tested on the CTX3030 in the Ferrous-coin mode with the pennies on a patch of ground cleared of any other metal.
Correction caught by Cudamark:
You are correct. 62-82 has .950 copper and .05 zinc. no tin. oops on my part copied it down wrong.


You can easily see from the data that the TID values change when the composition or weight changes.

 

[cudamark]

I think some of the data on that sheet is incorrect. My understanding is that the '62-82 Memorial cents do not have tin in them. Regardless, it still doesn't explain why 1864-up Indians, most of the wheats, and the early Memorials read different, but, have the same metal composition and weight. I always found that strange.

 

[pulltabfelix]

I think some of the data on that sheet is incorrect. My understanding is that the '62-82 Memorial cents do not have tin in them. Regardless, it still doesn't explain why 1864-up Indians, most of the wheats, and the early Memorials read different, but, have the same metal composition and weight. I always found that strange.

You are correct. 62-82 has .950 copper and .05 zinc. no tin. oops on my part copied it down wrong

 

[pulltabfelix]

Ok, lots of corrections here. I should not have created this chart from the very small print out of "A Guide Book of United States Coins 2019 by R.S. Yeoman, 72nd edition when I had this head cold.

Here is the corrected file. I hope I got it right this time, I don't wish to mislead anyone with bad info.

The test was an air test on ground I cleared with my CTX3030 to make sure no other metal items were in the ground. Height was about 7" above the ground using Ferrous-Coin mode. My ground is moderately mineralized but that should not have affected anything since it was an air test.

Sorry for the goofs.