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Implementation The Weights and Measures Act of 1824 was initially scheduled to go into effect on 1 May 1825.<ref name="google339">{{#invoke:citation/CS1|citation |CitationClass=book }}</ref> However, the Weights and Measures Act of 1825 pushed back the date to 1 January 1826.<ref>{{#invoke:citation/CS1|citation |CitationClass=book }}</ref> The 1824 Act allowed the continued use of pre-imperial units provided that they were customary, widely known, and clearly marked with imperial equivalents.<ref name="google339"/>

Apothecaries' units

Imperial standards of length 1876 in Trafalgar Square, London.

Apothecaries' units are mentioned neither in the act of 1824 nor 1825. At the time, apothecaries' weights and measures were regulated "in England, Wales, and Berwick-upon-Tweed" by the London College of Physicians, and in Ireland by the Dublin College of Physicians. In Scotland, apothecaries' units were unofficially regulated by the Edinburgh College of Physicians. The three colleges published, at infrequent intervals, pharmacopoeiae, the London and Dublin editions having the force of law.<ref name="Edinburgh medical and surgical journal">{{#invoke:citation/CS1|citation |CitationClass=book }}</ref><ref name="IrelandButler1765">{{#invoke:citation/CS1|citation |CitationClass=book }}</ref>

Imperial apothecaries' measures, based on the imperial pint of 20 fluid ounces, were introduced by the publication of the London Pharmacopoeia of 1836,<ref name="Gray1836">{{#invoke:citation/CS1|citation |CitationClass=book }}</ref><ref>A Translation of the Pharmacopoeia of the Royal College of Physicians of London, 1836</ref> the Edinburgh Pharmacopoeia of 1839,<ref name="The Pharmacopoeia of the Royal College of Physicians of Edinburgh">{{#invoke:citation/CS1|citation |CitationClass=book }}</ref> and the Dublin Pharmacopoeia of 1850.<ref name="DublinIreland1850">{{#invoke:citation/CS1|citation |CitationClass=book }}</ref> The Medical Act of 1858 transferred to The Crown the right to publish the official pharmacopoeia and to regulate apothecaries' weights and measures.<ref name="Britain1858">{{#invoke:citation/CS1|citation |CitationClass=book }}</ref>


Imperial units sections
Intro  Implementation  Units   Natural equivalents    Relation to other systems    Current use of imperial units    See also   Notes   References    External links   

Implementation
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