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Johan Gottlieb Gahn
Johan Gottlieb Gahn (19 August 1745 – 8 December 1818) was a Swedish chemist and metallurgist who isolated manganese in 1774. Gahn studied in Uppsala 1762 – 1770 and became acquainted with chemists Torbern Bergman and Carl Wilhelm Scheele. 1770 he settled in Falun, where he introduced improvements in copper smelting, and participated in building up several factories, including those for vitriol, sulfur and red paint. He was the chemist for The Swedish Board of Mines '' Bergskollegium'' from 1773 – 1817. Gahn was however very reluctant to publish his scientific findings himself, but freely communicated them to Bergman and Scheele. One of Gahn's discoveries was that manganese dioxide could be reduced to manganese metal using carbon, becoming the first to isolate this element in its metal form. In 1784, Gahn was elected a member of the Royal Swedish Academy of Sciences. He also made a managerial career in Swedish mining. See also * Gahnite Gahnite, ZnAl2O4, is a rare min ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hälsingland
Hälsingland (), sometimes referred to as Helsingia in English, is a historical province or ''landskap'' in central Sweden. It borders Gästrikland, Dalarna, Härjedalen, Medelpad and the Gulf of Bothnia. It is part of the land of Norrland. Administration The traditional provinces of Sweden serve no administrative or political purpose, but are historical and cultural entities. In the case of Hälsingland the province constitutes the northern part of the ''län'' ('administrative county') Gävleborg County. Minor parts of the province are in Jämtland County and in Västernorrland County. The following municipalities have their seats in Hälsingland: * Bollnäs * Hudiksvall * Ljusdal * Nordanstig * Ovanåker * Söderhamn The six largest settlements are: * Bollnäs * Hudiksvall * Söderhamn * Ljusdal * Edsbyn * Iggesund Heraldry The coat of arms were granted in 1560 in the era of King Gustav Vasa. At that time, Hälsingland was known for its large scale goat bree ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Swedish Board Of Mines
The Swedish Board of Mines ( sv, Bergskollegium) was a government agency in Sweden The government agencies in Sweden are state-controlled organizations that act independently to carry out the policies of the Government of Sweden. The ministries are relatively small and merely policy-making organizations, allowed to monitor the ... that worked between 1637 and 1857 with the task of guiding and controlling the mining industry and metal processing in Sweden. Between 1637 and 1649 its name was Generalbergsamtet, also called Bergsämbetet. References Further reading * * Defunct government agencies of Sweden Economic history of Sweden {{Sweden-gov-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
19th-century Swedish Chemists
The 19th (nineteenth) century began on 1 January 1801 ( MDCCCI), and ended on 31 December 1900 ( MCM). The 19th century was the ninth century of the 2nd millennium. The 19th century was characterized by vast social upheaval. Slavery was abolished in much of Europe and the Americas. The First Industrial Revolution, though it began in the late 18th century, expanding beyond its British homeland for the first time during this century, particularly remaking the economies and societies of the Low Countries, the Rhineland, Northern Italy, and the Northeastern United States. A few decades later, the Second Industrial Revolution led to ever more massive urbanization and much higher levels of productivity, profit, and prosperity, a pattern that continued into the 20th century. The Islamic gunpowder empires fell into decline and European imperialism brought much of South Asia, Southeast Asia, and almost all of Africa under colonial rule. It was also marked by the collapse of the lar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
