employment+range

SUBJECT AREA: Mining and extraction technology

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He was the eldest son of Wolf Christopher Polhamma, a merchant. The father died in 1669 and the son was sent by his stepfather to an uncle in Stockholm who found him a place in the Deutsche Rechenschule. After the death of his uncle, he was forced to find employment, which he did with the Biorenklou family near Uppsala where he eventually became a kind of estate bailiff. It was during this period that he started to work with a lathe, a forge and at carpentry, displaying great technical ability. He realized that without further education he had little chance of making anything of his life, and accordingly, in 1687, he registered at the University of Uppsala where he studied astronomy and mathematics, remaining there for three years. He also repaired two astronomical pendulum clocks as well as the decrepit medieval clock in the cathedral. After a year's work he had this clock running properly: this was his breakthrough. He was summoned to Stockholm where the King awarded him a salary of 500 dalers a year as an encouragement to further efforts. Around this time, one of increasing mechanization and when mining was Sweden's principal industry, Pohlem made a model of a hoist frame for mines and the Mines Authority encouraged him to develop his ideas. In 1693 Polhem completed the Blankstot hoist at the Stora Kopparberg mine, which attracted great interest on the European continent.

From 1694 to 1696 Polhem toured factories, mills and mines abroad in Germany, Holland, England and France, studying machinery of all kinds and meeting many foreign engineers. In 1698 he was appointed Director of Mining Engineering in Sweden, and in 1700 he became Master of Construction in the Falu Mine. He installed the Karl XII hoist there, powered by moving beams from a distant water-wheel. His plan of 1697 for all the machinery at the Falu mine to be driven by three large and remote water-wheels was never completed.

In 1707 he was invited by the Elector of Hanover to visit the mines in the Harz district, where he successfully explained many of his ideas which were adopted by the local engineers. In 1700, in conjunction with Gabriel Stierncrona, he founded the Stiersunds Bruk at Husby in Southern Dalarna, a factory for the mass production of metal goods in iron, steel and bronze. Simple articles such as pans, trays, bowls, knives, scissors and mirrors were made there, together with the more sophisticated Polhem lock and the Stiersunds clock. Production was based on water power. Gear cutting for the clocks, shaping hammers for plates, file cutting and many other operations were all water powered, as was a roller mill for the sheet metal used in the factory. He also designed textile machinery such as stocking looms and spinning frames and machines for the manufacture of ribbons and other things.

In many of his ideas Polhem was in advance of his time and Swedish country society was unable to absorb them. This was largely the reason for the Stiersund project being only a partial success. Polhem, too, was of a disputatious nature, self-opinionated almost to the point of conceit. He was a prolific writer, leaving over 20,000 pages of manuscript notes, drafts, essays on a wide range of subjects, which included building, brick-making, barrels, wheel-making, bell-casting, organ-building, methods of stopping a horse from bolting and a curious tap "to prevent serving maids from sneaking wine from the cask", the construction of ploughs and threshing machines. His major work, Kort Berattelse om de Fornamsta Mechaniska Inventioner (A Brief Account of the Most Famous Inventions), was printed in 1729 and is the main source of knowledge about his technological work. He is also known for his "mechanical alphabet", a collection of some eighty wooden models of mechanisms for educational purposes. It is in the National Museum of Science and Technology in Stockholm.

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a posteriori mean апостериорное среднее arithmetic mean арифметическое значение arithmetic mean арифметическое среднее arithmetic mean среднее арифметическое asymptotic mean асимптотическое значение среднего asymptotical mean асимптотическое значение среднего by all means конечно, пожалуйста; by any means каким бы то ни было образом; by means of... посредством... by all means любой ценой, во что бы то ни стало by all means любым способом by all means конечно, пожалуйста; by any means каким бы то ни было образом; by means of... посредством... by all means конечно, пожалуйста; by any means каким бы то ни было образом; by means of... посредством... by no means никоим образом; ни в коем случае by no means нисколько, отнюдь не; it is by no means cheap это отнюдь не дешево no: mean two ways about it не может быть двух мнений насчет этого; by no means никоим образом; конечно, нет conditional mean условное среднее estimated mean оценка среднего to feel mean чувствовать себя нездоровым to feel mean чувствовать себя неловко geometric mean среднее геометрическое geometrical mean среднее геометрическое mean середина; the golden (или happy) mean золотая середина harmonic mean гармоническое среднее harmonical mean гармоническое среднее to mean mischief предвещать дурное; to mean well (ill) иметь добрые (дурные) намерения; he means well by us он желает нам добра mean (meant) намереваться; иметь в виду; I didn't mean to offend you я не хотел вас обидеть in the mean time тем временем; между тем by no means нисколько, отнюдь не; it is by no means cheap это отнюдь не дешево limiting mean предельное среднее long range mean среднее по большому интервалу long time mean среднее по большому интервалу mean бедный mean думать, подразумевать mean думать mean значить, означать, иметь значение mean значить mean иметь в виду mean иметь значение mean стат. математическое ожидание mean намереваться, иметь в виду mean (meant) намереваться; иметь в виду; I didn't mean to offend you я не хотел вас обидеть mean намереваться mean нечестный mean низкий, подлый, нечестный mean нищенский mean означать mean плохой mean подразумевать mean посредственный; плохой; слабый; no mean abilities хорошие способности mean посредственный mean предназначать(ся); to mean it be used предназначать (что-л.) для пользования mean разг. придирчивый; недоброжелательный mean середина; the golden (или happy) mean золотая середина mean разг. скромный, смущающийся mean скудный mean скупой, скаредный mean слабый mean среднее значение mean мат. среднее число mean средний; mean line мат. биссектриса; mean time среднее солнечное время; mean water нормальный уровень воды; межень mean средний mean средняя величина mean pl средства, состояние, богатство; means of subsistence средства к существованию; a man of means человек со средствами, состоятельный человек mean средства, состояние, богатство mean средство, способ mean pl (употр. как sing и как pl) средство; способ; the means of communication средства сообщения mean амер. трудный, неподдающийся mean in question искомое среднее mean предназначать(ся); to mean it be used предназначать (что-л.) для пользования mean средний; mean line мат. биссектриса; mean time среднее солнечное время; mean water нормальный уровень воды; межень to mean mischief иметь дурные намерения to mean mischief предвещать дурное; to mean well (ill) иметь добрые (дурные) намерения; he means well by us он желает нам добра mean средний; mean line мат. биссектриса; mean time среднее солнечное время; mean water нормальный уровень воды; межень time: mean mean вчт. среднее время mean value theorem теорема о среднем mean средний; mean line мат. биссектриса; mean time среднее солнечное время; mean water нормальный уровень воды; межень to mean mischief предвещать дурное; to mean well (ill) иметь добрые (дурные) намерения; he means well by us он желает нам добра mean yield средний урожай the means of payment эк. платежные средства; the means and instruments of production орудия и средства производства the means of circulation эк. средства обращения mean pl (употр. как sing и как pl) средство; способ; the means of communication средства сообщения means: mean of communication средства коммуникации mean of communication средства связи mean of communication средства сообщения means of employment средства обеспечения занятости the means of payment эк. платежные средства; the means and instruments of production орудия и средства производства means: mean of payment способ платежа mean of payment средства платежа mean of payment средства расчетов mean of payment средство платежа mean pl средства, состояние, богатство; means of subsistence средства к существованию; a man of means человек со средствами, состоятельный человек means: mean of subsistence средства к существованию means test проверка нуждаемости test: means mean проверка нуждаемости means mean проверка обеспеченности следствами к существованию means mean тест на бедность means mean тест на отсутствие средств к существованию moving mean скользящее среднее mean посредственный; плохой; слабый; no mean abilities хорошие способности overall mean общее среднее probabilistic mean математическое ожидание quadratic mean среднее квадратическое sample mean выборочное среднее simple mean среднее арифметическое single sample mean среднее по одной выборке theoretical mean value математическое ожидание trending mean изменяющееся среднее true mean истинное среднее unweighted mean невзвешенное среднее weighted mean взвешенное среднее weighted mean стат. взвешенное среднее what do you mean by that? почему вы поступаете так?; what did you mean by looking at me like that? в чем дело? Почему ты на меня так посмотрел? what do you mean by that? почему вы поступаете так?; what did you mean by looking at me like that? в чем дело? Почему ты на меня так посмотрел? what do you mean by that? что вы этим хотите сказать?