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:''For other meanings, including oxy-gas torches, see Blowtorch (disambiguation).'' A blowtorch (USA usage), or blowlamp (British usage, or rare or archaic), 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. Their fuel reservoir is disposable or refillable by exchange. The term "blowlamp" usually refers to liquid-fuelled torches still used in the UK. Liquid-fuelled torches are pressurized by a piston hand pump, while gas torches are self-pressurized by the fuel evaporation. Fuel torches are available in a vast range of size and output power. The term blowtorch applies to the smaller and lower temperature range of these. Blowtorches are typically a single hand-held unit, with their draught supplied by a natural draught of air. The larger torches may have a heavy fuel reservoir placed on the ground, connected by a hose. This is common for butane- or propane-fuelled gas torches, but also applies to the older, large liquid paraffin (kerosene) torches such as the Wells light. Many torches now use a hose-supplied gas feed, which is often mains gas. They may also have a forced air supply, from either an air blower or an oxygen cylinder. Both of these larger and more powerful designs are less commonly described as blowtorches, while the term blowtorch is usually reserved for the smaller and less powerful self-contained torches. The archaic term "blowpipe" is sometimes still used in relation to oxy-acetylene welding torches. ==History== 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 1797 or in 1799 German inventor August von Marquardt invented a blowlamp in Eberswalde. Another early blow pipe patent comes from USA, dated May 13, 1856. In 1882, a new vaporizing technique was developed by Carl Richard Nyberg in Sweden,〔(【引用サイトリンク】publisher=Rusty Remakes )〕 and the year after, the production of the Nyberg blow lamp started. It was quickly copied or licensed by many other manufacturers. The US blowlamp was independently developed with a distinctive flared base and was fuelled by gasoline, whereas the European versions used kerosene for safety and low cost. After the Korean War in the 1950s, propane caused many changes in the blowlamp industry worldwide, and by the 1970s most manufacturers of the old type of blowlamp, using gasoline or kerosene as fuel, had disappeared. There remain several manufacturers producing brass blow lamps in India, China and North Korea for markets where propane gas is difficult to obtain or too expensive to be viable. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「blow torch」の詳細全文を読む スポンサード リンク
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