| Stone | |
|---|---|
 A 16th-centurybronze 1-stone weight emblazoned with theEnglish coat of arms | |
| General information | |
| Unit system | British imperial |
| Unit of | Mass |
| Abbreviation | st |
Thestone orstone weight (abbreviation:st.)[1] is anEnglish andBritish imperial unit ofmass equal to 14avoirdupoispounds (6.35 kg).[nb 1] The stone continues in customary use in the United Kingdom and Ireland forbody weight.
England and otherGermanic-speaking countries ofNorthern Europe formerly used various standardised "stones" for trade, with their values ranging from about 5 to 40 local pounds (2.3 to 18.1 kg) depending on the location and objects weighed. With the advent ofmetrication, Europe's various "stones" were superseded by or adapted to the kilogram from the mid-19th century onward.
The name "stone" derives from the historical use of stones for weights, a practice that dates back into antiquity. TheBiblical law against the carrying of "diverse weights, a large and a small"[7] is more literally translated as "you shall not carry a stone and a stone (אבן ואבן), a large and a small". There was no standardised "stone" in the ancient Jewish world,[8] but in Roman times stone weights were crafted to multiples of theRoman pound.[9] Such weights varied in quality: theYale Medical Library holds 10- and 50-pound examples of polishedserpentine,[10] while a 40-pound example at theEschborn Museum is made of sandstone.[11]
The 1772 edition of theEncyclopædia Britannica defined the stone:[12]
STONE also denotes a certain quantity or weight of some commodities. A stone of beef, in London, is the quantity of eight pounds; in Hertfordshire, twelve pounds; in Scotland sixteen pounds.
TheWeights and Measures Act 1824 (5 Geo. 4. c. 74), which applied to all of theUnited Kingdom of Great Britain and Ireland, consolidated the weights and measures legislation of several centuries into a single document. It revoked the provision that bales of wool should be made up of 20 stones, each of 14 pounds, but made no provision for the continued use of the stone. Ten years later, a stone still varied from 5 pounds (glass) to 8 pounds (meat and fish) to 14 pounds (wool and "horseman's weight").[13] TheWeights and Measures Act 1835 permitted using a stone of 14 pounds for trade[14] but other values remained in use. James Britten, in 1880 for example, catalogued a number of different values of the stone in various British towns and cities, ranging from 4 lb to 26 lb.[15] The value of the stone and associated units of measure that were legalised for purposes of trade were clarified by the Weights and Measures Act 1835 as follows:[14]
| Equivalent in pounds | Name of unit | Equivalent in stone | Approx. equivalent in kg |
|---|---|---|---|
| 1 | 1 pound | 1⁄14 | 0.4536 |
| 14 | 1 stone | 1 | 6.350 |
| 28 | 1 quarter | 2 | 12.70 |
| 112 | 1 hundredweight | 8 | 50.80 |
| 2,240 | 1 (long) ton | 160 | 1,016 |
TheEnglish stone underlaw varied by commodity and in practice varied according to local standards. TheAssize of Weights and Measures, astatute of uncertain date fromc. 1300, describes stones of 5 merchants' pounds used for glass; stones of 8 lb. used forbeeswax,sugar,pepper,alum,cumin,almonds,[16]cinnamon, andnutmegs;[17] stones of 12 lb. used forlead; and theLondon stone of12+1⁄2 lb. used forwool.[16][17] In 1350Edward III issued a new statute defining the stone weight, to be used for wool and "other Merchandizes", at 14 pounds,[nb 2] reaffirmed byHenry VII in 1495.[19]
In England, merchants traditionally sold potatoes in half-stone increments of 7 pounds. Live animals were weighed in stones of 14 lb; but, once slaughtered, their carcasses were weighed in stones of 8 lb. Thus, if the animal's carcass accounted for8⁄14 of the animal's weight, the butcher could return the dressed carcasses to the animal's owner stone for stone, keeping theoffal, blood and hide as his due for slaughtering and dressing the animal.[21]Smithfield market continued to use the 8 lb stone for meat until shortly before the Second World War.[22] TheOxford English Dictionary also lists:[23]
| Commodity | Number of pounds |
|---|---|
| Wool | 14, 15, 24 |
| Wax | 12 |
| Sugar and spice | 8 |
| Beef and mutton | 8 |
TheScottish stone was equal to 16 Scottish pounds (17 lb 8 oz avoirdupois or 7.936 kg). In 1661, the Royal Commission of Scotland recommended that the Troy stone be used as a standard of weight and that it be kept in the custody of the burgh ofLanark. The tron (or local) stone ofEdinburgh, also standardised in 1661, was 16 tron pounds (22 lb 1 oz avoirdupois or 9.996 kg).[24][25] In 1789 an encyclopedic enumeration of measurements was printed for the use of "his Majesty's Sheriffs and Stewards Depute, and Justices of Peace, ... and to the Magistrates of the Royal Boroughs of Scotland" and provided a county-by-county and commodity-by-commodity breakdown of values and conversions for the stone and other measures.[26] The Scots stone ceased to be used for trade when theWeights and Measures Act 1824 (5 Geo. 4. c. 74) established a uniform system of measure across the whole of the United Kingdom, which at that time included all of Ireland.[27]
Before the early 19th century, as in England, the stone varied both with locality and with commodity. For example, theBelfast stone for measuring flax equaled 16.75 avoirdupois pounds.[28] The most usual value was 14 pounds.[29] Among the oddities related to the use of the stone was the practice inCounty Clare of a stone of potatoes being 16 lb in the summer and 18 lb in the winter.[29]
In 1965, theFederation of British Industry informed the British government that its members favoured adopting the metric system. TheBoard of Trade, on behalf of the government, agreed to support a ten-year metrication programme. There would be minimal legislation, as the programme was to be voluntary and costs were to be borne where they fell.[30] Under the guidance of theMetrication Board, the agricultural product markets achieved a voluntary switchover by 1976.[31] The stone was not included in theDirective 80/181/EEC as a unit of measure that could be used within theEEC for "economic, public health, public safety or administrative purposes",[32] though its use as a "supplementary unit" was permitted. The scope of the directive was extended to include all aspects of theEU internal market from 1 January 2010.[33]
With the adoption of metric units by the agricultural sector, the stone was, in practice, no longer used for trade; and, in theWeights and Measures Act 1985, passed in compliance with EU directive 80/181/EEC,[32] the stone was removed from the list of units permitted for trade in the United Kingdom.[34][35][36] In 1983, in response to the same directive, similar legislation was passed in Ireland.[37] The act repealed earlier acts that defined the stone as a unit of measure for trade.[36] (British law had previously been silent regarding other uses of the stone.)
The stone remains widely used in the United Kingdom and Ireland for human body weight: in those countries people may commonly be said to weigh, e.g., "11 stone 4" (11 stones and 4 pounds), rather than "72 kilograms" as in most of the other countries, or "158 pounds", the conventional way of expressing the same weight in the US and in Canada.[38] The invariant plural form ofstone in this context isstone (as in, "11 stone" or "12 stone 6 pounds"); in other contexts, the correct plural isstones (as in, "Please enter your weight in stones and pounds"). In Australia and New Zealand,metrication has entirely displaced stones and pounds since the 1970s.
In many sports in both the UK and Ireland, such as professional boxing, wrestling, and horse racing,[39] the stone is used to express body weights.
The use of the stone in the formerBritish Empire was varied. In Canada for example, it never had a legal status.[40]Shortly after the United States declared independence,Thomas Jefferson, thenSecretary of State, presented areport on weights and measures to theU.S. House of Representatives. Even though all the weights and measures in use in the United States at the time were derived from English weights and measures, his report made no mention of the stone being used. He did, however, propose a decimal system of weights in which his "[decimal] pound" would have been 9.375 ounces (265.8 g) and the "[decimal] stone" would have been 5.8595 pounds (2.6578 kg).[41]
Before the advent of metrication, units called "stone" (German:Stein;Dutch:steen;Polish:kamień) were used in many northwestern European countries.[42][43] Its value, usually between 3 and 10 kg, varied from city to city and sometimes from commodity to commodity. The number of local "pounds" in a stone also varied from city to city. During the early 19th century, states such as the Netherlands (including Belgium) and the South Western German states, which had redefined their system of measures using thekilogramme des Archives as a reference for weight (mass), also redefined their stone to align it with the kilogram.
This table shows a selection of stones from various northern European cities:
| City | Modern country | Term used | Weight of stone in kilograms | Weight of stone in local pounds | Comments |
|---|---|---|---|---|---|
| Dresden[44] | Germany | Stein | 10.15 | 22 | Before 1841 |
| 10.0 | 20 | From 1841 onwards | |||
| Germany | schwerer Stein | 10.296 | 22 | heavy stone | |
| leichter Stein | 5.148 | 11 | light stone | ||
|
| großer Stein | 15.444 | 33 | large stone |
| kleiner Stein | 10.296 | 22 | small stone | ||
| Bremen[44] | Germany | Stein Flachs | 9.97 | 20 | stone of flax |
| Stein Wolle und Federn | 4.985 | 10 | stone of wool and feathers | ||
| Oldenburg[44] | Germany | Stein Flachs | 9.692 | 20 | stone of flax |
| Stein Wolle und Federn | 4.846 | 10 | stone of wool and feathers | ||
| Kraków[44] | Poland | Stein | 10.137 | 25 | |
| Osnabrück[44] | Germany | Stein | 4.941 | 10 | |
| Amsterdam[44] | Netherlands | steen | 3.953 | 8 | Before 1817 |
| 3 | 6 | "Metric stone" (after 1817) | |||
| Karlsruhe[44] | Germany | Stein | 5.00 | 10 | |
| Germany | Stein | 10.287 | 22 | ||
| Breslau (Wrocław)[44] | Poland | Stein | 9.732 | 24 | |
| Antwerp[44] | Belgium | steen | 3.761 | 8 | |
| Prague[45] | Czech Republic | kámen/Stein | 10.29 | 20 | |
| Solothurn[44] | Switzerland | Stein | 5.184 | 10 | |
| Stockholm[45] | Sweden | sten | 13.60 | 32 | (32 Skålpund) |
| Warsaw[45] | Poland | kamień | 10.14 | 25 | |
| Vilnius[45] | Lithuania | kamieni | 14.992 | 40 | |
| Vienna[45] | Austria | Stein | 11.20 | 20 |
In the Netherlands, where the metric system was adopted in 1817, thepond (pound) was set equal to half akilogram, and thesteen (stone), which had previously been 8Amsterdam pond (3.953 kg), was redefined as being 3 kg.[43] In modern colloquial Dutch, apond is used as an alternative for 500 grams or half a kilogram, while theons is used for a weight of 100 grams, being1⁄5 pond.
The " stone " has been a common measure of weight in north-western Europe. In Germany....
liege.
