![]() Used for measuring distances at sea (and also in aviation) and approximately equal to one arc minute of a great circle. Equal to 100 fathoms under the strict definition. 6.08 ft) until the adoption of the international nautical mile. This was despite its being 1⁄ 1000 of a nautical mile (i.e. The British Admiralty in practice used a fathom of 6 ft. No longer an official unit in any nation. ![]() The distance between the two wickets on a cricket pitch. Still used in English-speaking (i.e., US and Commonwealth) nations to measure heights of horses.ĭefined as exactly 0.9144 m by the international yard and pound agreement of 1959ġ00 links, 4 rods, or 1⁄ 10 of a furlong. Before this date, the most precise measurement of the imperial Standard Yard was 0.914 398 415 metres. Metric equivalents in this article usually assume the latest official definition. The Medical Act of 1858 transferred to The Crown the right to publish the official pharmacopoeia and to regulate apothecaries' weights and measures. Imperial apothecaries' measures, based on the imperial pint of 20 fluid ounces, were introduced by the publication of the London Pharmacopoeia of 1836, the Edinburgh Pharmacopoeia of 1839, and the Dublin Pharmacopoeia of 1850. The three colleges published, at infrequent intervals, pharmacopoeias, the London and Dublin editions having the force of law. In Scotland, apothecaries' units were unofficially regulated by the Edinburgh College of Physicians. 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. Imperial standards of length 1876 in Trafalgar Square, London.Īpothecaries' units are mentioned neither in the act of 18. The modern UK legislation defining the imperial system of units is given in the Weights and Measures Act 1985 (as amended). The system came into official use across the British Empire in 1826.īy the late 20th century, most nations of the former empire had officially adopted the metric system as their main system of measurement, but imperial units are still used alongside metric units in the United Kingdom and in some other parts of the former empire, notably Canada. The imperial units replaced the Winchester Standards, which were in effect from 1588 to 1825. The imperial system developed from earlier English units as did the related but differing system of customary units of the United States. The imperial system of units, imperial system or imperial units (also known as British Imperial or Exchequer Standards of 1826) is the system of units first defined in the British Weights and Measures Act 1824 and continued to be developed through a series of Weights and Measures Acts and amendments. ![]() The former Weights and Measures office in Seven Sisters, London (590 Seven Sisters Road)
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