Original upload date: Thu, 17 Nov 2011 01:00:00 GMT
Archive date: Tue, 02 Nov 2021 00:32:19 GMT
Some amazing artifacts - original standard weights for the pound and troy pound. The troy pound is made from pure platinum!
A correction.. The silicon isotope used is 28, not 29 as stated in the vi
...
deo! Sorry!
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