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Correspondence between Henry Hucks Gibbs and Edward Lucas Jenks Ridsdale (Chief Assayer of the Royal Mint), on bimetallism (i.e. the use of a monetary standard based on both silver and gold), 1876-1884. Including a letter from E Koch to Gibbs, thanking him for permission to translate a pamphlet on bimetallism into German.

Letter from William Henry Rowlestone Jessop of Grove House, St David's, Haverfordwest, [Pembrokeshire] to an unidentified correspondent, 17 Oct 1855. Accompanying a copy of his work on the decimal system: '... it is the first book which embraces the whole System of Money and Measures that has yet appeared ... You will perceive that this system is very superior to that in France [i.e. to the metric system]'.

Autograph, with signature.

Letter from Thomas Babington Macaulay of Holly Lodge, Kensington to Augustus De Morgan, 7 Nov 1857. Thanking him for a copy of his pamphlet [Answers to the questions communicated by Lord Overstone to the Decimal Coinage Commissioners; (London, 1857)]. 'I will frankly own to you that you seem to me greatly to overrate the advantages and greatly to underrate the inconveniences of the change which you recommend.

Autograph, with signature.