Link in multi-metal chain. 
I had been wondering about how hard it would be to make a multi-part graphite mold with which I could cast chain links around each other.  That is, given an existing link, cast a new one interlinked with it.  This turns out to be quite do-able: Here is the mold I made (using my drill press as a vertical mill and a round-ended router bit): 
    
In case you ever want to try this, I'll give you an important hint: The third link is the real test, not the second one. 
 
Using this mold I have cast a chain out of all the metals I can easily cast.  Click the Sample Group link below to see all the links together. 
 
This chain (counted as one sample) is the 600th sample added to my collection. 
 
Source: eBay seller kingendymion 
Contributor: Theodore Gray 
Acquired: 9 August, 2003 
Text Updated: 20 February, 2006 
Price: $1/pound 
Size: 3" 
Purity: 99.99% 
Sample Group: Multi-metal Chain
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