A blowtorch or blowlamp is a fuel-burning tool used for applying flame and heat to various applications, usually metalworking. Early blowlamps used liquid fuel, carried in a refillable reservoir attached to the lamp. Modern blowtorches are mostly gas-fuelled. The blowlamp is of ancient origin and was used as a tool by gold and silversmiths. They began literally as a "blown lamp", a wick oil lamp with a mouth-blown tube alongside the flame. This type of lamp, with spirit fuel, continued to be in use for such small tasks into the late 20th century. In 1882, a new vaporizing technique was developed by Carl Richard Nyberg in Sweden, and the year after, the production of the Nyberg blow lamp started. It was quickly copied or licensed by many other manufacturers. Carl Richard Nyberg (May 28, 1858, – 1939) was the founder of Max Sievert’s Lödlampfabrik, then one of the largest industries in Sundbyberg, Sweden. After school he started working for a jeweller and later he moved to Stockholm and worked with various metalworks. 1882 and set up a workshop at Luntmakargatan in Stockholm making blowtorches. However the business didn't work well because it took too long to both manufacture and sell them. In 1886 he met Max Sievert (1849 - 1913) at a country fair and Sievert became interested in Nyberg's blowtorch and started selling it. In 1922 the company was sold to Max Sievert who continued to own it until 1964 when it was bought by Esso. The blowtorch is commonly used where a diffuse high temperature naked flame heat is required but not so hot as to cause combustion or welding: soldering, brazing, softening paint for removal, melting roof tar, or pre-heating large castings before welding such as for repairing. It is also common for use in weed control by controlled burn methods, melting snow and ice from pavements and driveways in cold climate areas, road repair crews may use a blowtorch to heat asphalt or bitumen for repairing cracks in preventive maintenance. It is also used in cooking; one common use is for the creation of the layer of hard caramelised sugar in a crème brûlée.
A brass blowtorch, 'Sievert' with a wooden handle
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