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'''[[Great Britain|British]] Standard Wire Gauge''' is a set of wire sizes given by [[British_Standards|BS]] 3737:1964 (now withdrawn), and is generally abbreviated to SWG. It is also known as: '''Imperial Wire Gauge''' or '''British Standard Gauge'''. Use of SWG sizes has fallen greatly in popularity, but is still used as a measure of thickness in guitar strings and some electrical wire. Cross sectional area in square millimetres is now a more popular size measurement. The current British Stand for metallic materials such as wire and sheet is BS 6722:1986, which is a solely metric standard.
SWG was fixed by [[Order of Council]] [[August 23]] [[1883]]. It was constructed by improving the [[Birmingham Wire Gauge]].
The basis of the system is the [[mil]], or 0.001[[inch|in]]. No. 7/0, the largest size, is 0.50 in. (500 mils or 12.7 mm) in diameter, and the smallest, No. 50, is 0.001 in. (1 mil or about 25 µm) in diameter. Between each gauge, the weight diminishes by 20%. Because the weight per unit length is related to the area, and therefore the square of the diameter, the diameter diminishes by approximately 10.
▲SWG was fixed by [[Order of Council]] [[August 23]] [[1883]]. It was constructed by improving the [[Birmingham Wire Gauge]]. Made legal standard [[March 1]] [[1884]] by the [[British Board of Trade]].
▲The basis of the system is the [[mil]], or 0.001[[inch|in]]. No. 7/0, the largest size, is 0.50 in. (500 mils or 12.7 mm) in diameter, and the smallest, No. 50, is 0.001 in. (1 mil or about 25 µm) in diameter. Between each gauge, the weight diminishes by 20%. Because the weight per unit length is related to the area, and therefore the square of the diameter, the diameter diminishes by 10.557%:
▲:<math>\mbox{Diameter Ratio} = 1-(1-0.2)^{\frac{1}{2}} \approx 10.557%</math>
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