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deleted
16 Posts |
 Posted - 01/18/2008 : 22:48:01
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I got some boxes of pennies today, and was trying to guess how many coppers are in them based on the weight of the box. I wound up creating the chart below, which maybe some of you will find useful.
Using 3.11 grams per Copper and 2.5 grams per Zinc
For a box of 2500 pennies (overhead of 84g for the box and 50g [1g per wrapper]):
| 7,909.0 grams | Cu: 2500 | Zi:0000 | 100.00 % copper (by weight) | 100 % copper (by count) |
| 7,848.0 grams | Cu: 2400 | Zi:0100 | 096.76 % copper (by weight) | 096 % copper (by count) |
| 7,787.0 grams | Cu: 2300 | Zi:0200 | 093.47 % copper (by weight) | 092 % copper (by count) |
| 7,726.0 grams | Cu: 2200 | Zi:0300 | 090.12 % copper (by weight) | 088 % copper (by count) |
| 7,665.0 grams | Cu: 2100 | Zi:0400 | 086.72 % copper (by weight) | 084 % copper (by count) |
| 7,604.0 grams | Cu: 2000 | Zi:0500 | 083.27 % copper (by weight) | 080 % copper (by count) |
| 7,543.0 grams | Cu: 1900 | Zi:0600 | 079.75 % copper (by weight) | 076 % copper (by count) |
| 7,482.0 grams | Cu: 1800 | Zi:0700 | 076.18 % copper (by weight) | 072 % copper (by count) |
| 7,421.0 grams | Cu: 1700 | Zi:0800 | 072.55 % copper (by weight) | 068 % copper (by count) |
| 7,360.0 grams | Cu: 1600 | Zi:0900 | 068.86 % copper (by weight) | 064 % copper (by count) |
| 7,299.0 grams | Cu: 1500 | Zi:1000 | 065.11 % copper (by weight) | 060 % copper (by count) |
| 7,238.0 grams | Cu: 1400 | Zi:1100 | 061.29 % copper (by weight) | 056 % copper (by count) |
| 7,177.0 grams | Cu: 1300 | Zi:1200 | 057.40 % copper (by weight) | 052 % copper (by count) |
| 7,116.0 grams | Cu: 1200 | Zi:1300 | 053.45 % copper (by weight) | 048 % copper (by count) |
| 7,055.0 grams | Cu: 1100 | Zi:1400 | 049.43 % copper (by weight) | 044 % copper (by count) |
| 6,994.0 grams | Cu: 1000 | Zi:1500 | 045.34 % copper (by weight) | 040 % copper (by count) |
| 6,933.0 grams | Cu: 0900 | Zi:1600 | 041.17 % copper (by weight) | 036 % copper (by count) |
| 6,872.0 grams | Cu: 0800 | Zi:1700 | 036.92 % copper (by weight) | 032 % copper (by count) |
| 6,811.0 grams | Cu: 0700 | Zi:1800 | 032.60 % copper (by weight) | 028 % copper (by count) |
| 6,750.0 grams | Cu: 0600 | Zi:1900 | 028.20 % copper (by weight) | 024 % copper (by count) |
| 6,689.0 grams | Cu: 0500 | Zi:2000 | 023.72 % copper (by weight) | 020 % copper (by count) |
| 6,628.0 grams | Cu: 0400 | Zi:2100 | 019.16 % copper (by weight) | 016 % copper (by count) |
| 6,567.0 grams | Cu: 0300 | Zi:2200 | 014.50 % copper (by weight) | 012 % copper (by count) |
| 6,506.0 grams | Cu: 0200 | Zi:2300 | 009.76 % copper (by weight) | 008 % copper (by count) |
| 6,445.0 grams | Cu: 0100 | Zi:2400 | 004.93 % copper (by weight) | 004 % copper (by count) |
| 6,384.0 grams | Cu: 0000 | Zi:2500 | 000.00 % copper (by weight) | 000 % copper (by count) |
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Ardent Listener
Administrator
USA
4841 Posts |
Posted - 01/19/2008 : 06:29:37
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Thanks!
1 ounce = 28.3495231 grams - 16 ounces = 1 pound
I rounded to 28.35 divide the 7909 grams (100% copper box) = 278.97707 ounces, divided by 16= 17.436067 pounds
For those who are hoarding unsorted boxes your information is very valuable.
Of course a box may contain Canadian pennies, dimes, shorted or over filled. But if you aren't splitting hairs you should find that you are very close as to zinc to copper.
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Think positive. |
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Miser-stro
Penny Sorter Member
74 Posts |
Posted - 01/19/2008 : 17:49:03
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Thanks! That chart is awesome and will be put to good use!
I have a question though.... Why is the % by weight and the % by count different? If the math is correct, they should be the same shouldn't they (at least within 1%)? Please don't feel that I am questioning your calculations. I'm just curious. |
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deleted
16 Posts |
Posted - 01/19/2008 : 18:38:07
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I probably shouldn't have included the % copper by weight, it's not really useful (and confusing).
The percent copper by weight is what % of the weight is copper vs zinc.
So if you have 50 coppers and 50 zincs, it's going to be more than 50% Cu by weight because the coppers weigh more. (The 100 pennies would weigh 280.5 g, and about 55% of that weight [155.5g] is copper)
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Miser-stro
Penny Sorter Member
74 Posts |
Posted - 01/19/2008 : 20:05:57
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| Ahh, that clears things up! I guess for some reason I was thinking of a 100% Cu constant, but that would have thrown the whole calculation off anyway. Thanks again! |
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horgad
1000+ Penny Miser Member
USA
1641 Posts |
Posted - 01/20/2008 : 07:42:46
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There is a significant difference between the shotgun roll boxes and the the shrink wrap roll boxes. The shotgun roll boxes weigh about 20 grams more. This may not sound like much but 20 grams will throw your copper count per box estimate off by 33 pennies.
So when I mark my boxes, I add 20 grams to actual weight of the shrink wrap roll boxes. This gives me a consistent number to compare boxes with (even if the boxes are of different types). I then do my calculations pretending that all the boxes are shotgun rolls (this negates the 20 gram bonus that I gave myself earlier).
Also I tested your table against the calculation that I am using and we come pretty close to agreement. For example on a 6933 box your table says 36% and my calculation says 35%. Close enough for me.. |
Edited by - horgad on 01/20/2008 07:50:30 |
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16 Posts |
Posted - 01/20/2008 : 09:45:13
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| I was wondering what the +20 mark was on the boxes in your pics... I haven't gotten any shrink wrapped yet but now I know to open the boxes and check before writing any numbers on the box. |
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Weighing boxes of pennies
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