Coinage Act 1870
The Coinage Act 1870 (33 & 34 Vict. c. 10) stated the metric weights of British coins. For example, it defined the weight of the sovereign as 7.98805 grams (about 123.27747 grains). The Act was repealed by the Coinage Act 1971.
- Lisle, George, Accounting in Theory and Practice, 1906, republished by Read Books 2008 (ISBN 1-4097-7128-8, ISBN 978-1-4097-7128-9), p.277 "British Currency: Gold" (Google Books)
- Challis, C. E. A new history of the royal mint (1992), quoted in Ansell, George Frederick (1826–1880), chemist and assayer by W. P. Courtney, rev. Robert Brown, Oxford Dictionary of National Biography.