This note presents a simple method for determining the density of a coin using Archimedes principle. The Charles I counterfeit shilling mm Heart, presented in the previous blog, is used as an example. Once the density of the alloy is known it is possible to estimate the fineness of the silver and three methods are presented: mathematical, graphical and look-up table.
Determining the Density of a Coin using Archimedes’ Principle – Gary Oddie
BNS Research Blog 