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Why don't 1 oz. gold maples ring very well, if at all?
roadrunner
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Was comparing ring tones of maples to eagles to Krugs recently and was surprised to find that maples sound like clad coinage. I got one to give a very short and tinny ring but it
was a far cry from an Eagle. And another one tried wouldn't give any decent ring no matter how many times I tried. Yet the first tap on a Krug was crystal clear and went on forever, much stronger than the eagle. So what's different about the maples? And why does the Krug sound like a bell in a symphony orchestra?
roadrunner
was a far cry from an Eagle. And another one tried wouldn't give any decent ring no matter how many times I tried. Yet the first tap on a Krug was crystal clear and went on forever, much stronger than the eagle. So what's different about the maples? And why does the Krug sound like a bell in a symphony orchestra?
roadrunner
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Aren't Maples 999, AGE 925 and Krug 900?
I'd better check mines.
I've got a bunch of them.
Thanks for the heads-up.
handy to ring test. The Krug's ring tone seemed to be far superior to a 90% US $20 Saint.
roadrunner
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If you check the ring of a 50 Peso, Maple, Eagel and a K-Rand..... ( ballanced on a knuckle).
You will find that the 50 Peso will ring the best. Why?
Surface area to thickness ratio. The 50 Peso has the greatest surface area / thickness ratio.
The Maple " thuds " in compairison as it has the least sa / thickness ratio.
HAPPY PINGING!!!
********************
Silver is the mortar that binds the bricks of loyalty.
<< <i>Several factors.
If you check the ring of a 50 Peso, Maple, Eagel and a K-Rand..... ( ballanced on a knuckle).
You will find that the 50 Peso will ring the best. Why?
Surface area to thickness ratio. The 50 Peso has the greatest surface area / thickness ratio.
The Maple " thuds " in compairison as it has the least sa / thickness ratio.
HAPPY PINGING!!! >>
This makes a lot of sense.
Worry is the interest you pay on a debt you may not owe.
•1 Troy Ounce Canadian Gold Maple Leaf Coin
Face Value of $50 Canada – 33 mm diameter with 2.87 mm thickness
The one-ounce gold American Eagle has a diameter of 32.7mm, a thickness of 2.87mm, a total weight of 1.0909 troy ounces (or 33.931 grams), contains one troy ounce of gold
The Krugerrand is 32.6 mm in diameter and 2.74 mm thick. The Krugerrand's actual weight is 1.0909 troy ounces (33.93 g). It is minted from gold alloy that is 91.67% pure (22 karats), so the coin contains one troy ounce (31.1035 g) of gold.
The differences in surface area to width for the AGE and Maple are negligible. Essentially the same sized coin. Therefore, that can't explain the huge
ring tone differences. The 22 kt vs 24 kt is the only obvious factor remaining. But it seems illogical to me that a 10% alloy difference is the cause (see below).
And the diameter to thickness ratio differs by <4% from Krug to AGE. That seems fairly negligible also for such a pronounced ring tone difference.
It then occurred to me to look up bells. After all, a coin or bar is a bell, but just not in the hollow version we are accustomed to seeing. In the reference
below it indeed says that a bell made of pure elemental metals do not ring so well. Generally, quality bells are made of 70-90% copper with other metals added
for hardening, crack-resistance, tonal qualities, etc. Note that the heating, cooling and annealing processes in making the coin blanks could play a huge role in
whether you get a ring tone or a thud. It's possible the Canadian mint uses a slightly different process in making their coins. It takes great expertise by a bell maker
to get all the various octaves, partials, harmonics, etc. of the bell to line up. It just might be that the various mints have used similar technology in the manufacture
of their coins/blanks based on where they get them. Obviously if you're making gold coins for world-wide use one would want them to be readily distinguisable from
counterfeits. And a clear ring tone when dropped on a table or jostled with other coins in your pocket all play a part. But I'd still like to know how a 1 oz Buff or UHR
compares to an AGE and/or Canadian Maple.
www.msu.edu/~carillon/batmbook/chapter4.htm can't be linked directly. Paste it into your edit line or Google exactly the phrase "the musical bells" and click on that.
roadrunner
I don't have the link, but there's a youtube video where some guys have three 100oz bars, two engelhards and a JM. Two of the bars ring very nicely. The last Engelhard bar doesn't ring at all. They suspected it was a fake, so they sawed it in half. Result: it was pure silver.
From http://www.ehow.com/info_7992424_science-do-wire-hanger-invention.html
Turn a wire coat hanger upside down and tie a piece of 2-foot long string to each end of the bottom of the coat hanger. Tie the loose end of the strings to your right and left index fingers, then place your fingers in your ears. Tap the hanging hook end of the hanger on a table and listen for the bell tone.
It looks silly, but it actually sounds like a church bell, as I said, you just have to try it.
<< <i>I don't have the link, but there's a youtube video where some guys have three 100oz bars, two engelhards and a JM. Two of the bars ring very nicely. The last Engelhard bar doesn't ring at all. They suspected it was a fake, so they sawed it in half. Result: it was pure silver. >>
If there were a few trapped air bubbles in the bar it wouldn't ring.
Worry is the interest you pay on a debt you may not owe.
<< <i>It may be due to the different gold content.
Aren't Maples 999, AGE 925 and Krug 900? >>
Maples are .9999
I knew it would happen.
<< <i>
<< <i>It may be due to the different gold content.
Aren't Maples 999, AGE 925 and Krug 900? >>
Maples are .9999 >>
Not from 1979 to 1982.
(anyway, mine was an error)
<< <i>It may be due to the different gold content.
Aren't Maples 999, AGE 925 and Krug 900? >>
No, Maples are either .999 or .9999.
KR's are 22kt, .9166667 gold and .0833333 copper.
AGE's are also 22kt, .9166667 gold, .030000 silver and .0533333 copper.
Mexican 50 Pesos are .900 fine
I presume that a piece of metal must have a certain degree of hardness to ring. Imagine trying to ring a bag of geletin.
The 10% copper alloy presumably makes the 50 Pesos harder than the other three. Next would be the KR, with .0833333 copper. Next would be the AGE, with .0533333 copper. The .03000 silver also makes the gold harder, but not as much as the copper.
The ML, having no alloy, is relatively soft. That is why if you drop one on a hard table you can easily dent the edge.