Metrication in the United Kingdom that reported in 1818, and again in Parliament by Sir John Wrottesley in 1824. Another Royal Commission was set up 1838 by Chancellor of the Exchequer Thomas Spring Rice and it reported in 1841 that decimal coinage was required first. A third commission in 1853 advocated decimal coinage in the form £1 : 10 florins : 100 cents: 1000 mils. The first florins (one tenth of a pound sterling) were struck in 1849 as silver coins weighing and having a diameter of . An early supporter of the "Decimal Association" was the mathematician Augustus de Morgan whose articles supporting the
Halfpenny (Irish pre-decimal coin) Halfpenny (Irish pre-decimal coin) The halfpenny (d) () coin was the second smallest denomination of the pre-decimal Irish pound, worth of a pound or of a shilling. First issued in 1928 it ceased to be legal tender on 1 August 1969. The coin measured in diameter and weighed 5.66990 grams. The bronze coin was made up of 95.5% copper, 3% tin and 1.5% zinc. This was identical to the British halfpenny as both countries' pounds were pegged until 1979. The reverse design was by Percy Metcalfe, an English artist. The artist was given the choice of a boar, a sow