Message:

<p>[QUOTE=&quot;Conder101, post: 1734058, member: 66&quot;]I don&#039;t know of a list of tolerances online, I get mine from the Coin World Almanac, 1990 edition pages 339 - 342.</p><p><br /></p><p>I don&#039;t know what a Jolly is but from the context I am guessing it is something you hook to your triple beam balance to allow you to take weights in water for specific gravity measurements.&nbsp; While getting a specific gravity measurement isn&#039;t hard, the precision IS difficult.&nbsp; The first decimal place is easy and you can have a lot of confidence in it even with crude equipment.&nbsp; The second decimal place with consistency is a lot more difficult.&nbsp; The third decimal place is more trouble than it is worth.&nbsp; I have an analytical balance precise to .0001 grams and I don&#039;t trust my SG measurements to more than two places, and I allow .02 +/- on that second place.</p><p><br /></p><p>Overall composition of clad coins?&nbsp; According to the US Mint the copper nickel clad coins are 8.33% nickel and 91.66% copper.</p><p><br /></p><p>My reference shows density of copper and nickel at 8.96 and 8.902 respectively.[/QUOTE]</p><p><br /></p>

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in