Bar of aluminium given when first produced in bar to Faraday by the wish of Louis Napoleon. Faraday added the string to demonstrate to resonant qualities Bar of aluminium given to Michael Faraday by Napoleon III, c1855 1850-1859
Two sheets of 99.99% aluminium, which have been rolled, annealed and etched. 1973 Two sheets of 99.99% aluminium 1973