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SWG was fixed by [[Order of Council]] August 23, 1883. It was constructed by improving the [[Birmingham Wire Gauge]]. It was made legal standard March 1, 1884 by the British [[Board of Trade]].
SWG is not to be confused with [[AWG|American Wire Gage]] which has a similar but not quite
The basis of the system is the [[Thou_(length)|''thou'']], (or ''mil'' in US English) or {{nowrap|0.001 [[inch|in]]}}. No. 7/0, the largest size, is {{nowrap|0.50 in}}. (500 thou or {{nowrap|12.7 mm}}) in diameter, and the smallest, No. 50, is {{nowrap|0.001 in}}. ({{nowrap|1 thou}} or about {{nowrap|25 µm}}) in diameter. Between each gauge, the weight diminishes by approximately 20%. Because the weight per unit length is related to the area, and therefore the square of the diameter, the diameter diminishes by approximately 10.6%:
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